MCL/sf/os/persistentdata: comparison persistentstorage/sqlite3api/TEST/TCL/tcldistribution/changes

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+Recent user-visible changes to Tcl:
+RCS: @(#) $Id: changes,v 1.79.2.50 2007/05/16 22:13:07 das Exp $
+1. No more [command1] [command2] construct for grouping multiple
+commands on a single command line.
+2. Semi-colon now available for grouping commands on a line.
+3. For a command to span multiple lines, must now use backslash-return
+at the end of each line but the last.
+4. "Var" command has been changed to "set".
+5. Double-quotes now available as an argument grouping character.
+6. "Return" may be used at top-level.
+7. More backslash sequences available now.  In particular, backslash-newline
+may be used to join lines in command files.
+8. New or modified built-in commands:  case, return, for, glob, info,
+print, return, set, source, string, uplevel.
+9. After an error, the variable "errorInfo" is filled with a stack
+trace showing what was being executed when the error occurred.
+10. Command abbreviations are accepted when parsing commands, but
+are not recommended except for purely-interactive commands.
+11. $, set, and expr all complain now if a non-existent variable is
+referenced.
+12. History facilities exist now.  See Tcl.man and Tcl_RecordAndEval.man.
+13. Changed to distinguish between empty variables and those that don't
+exist at all.  Interfaces to Tcl_GetVar and Tcl_ParseVar have changed
+(NULL return value is now possible).  *** POTENTIAL INCOMPATIBILITY ***
+14. Changed meaning of "level" argument to "uplevel" command (1 now means
+"go up one level", not "go to level 1"; "#1" means "go to level 1").
+*** POTENTIAL INCOMPATIBILITY ***
+15. 3/19/90 Added "info exists" option to see if variable exists.
+16. 3/19/90 Added "noAbbrev" variable to prohibit command abbreviations.
+17. 3/19/90 Added extra errorInfo option to "error" command.
+18. 3/21/90 Double-quotes now only affect space:  command, variable,
+and backslash substitutions still occur inside double-quotes.
+*** POTENTIAL INCOMPATIBILITY ***
+19. 3/21/90 Added support for \r.
+20. 3/21/90 List, concat, eval, and glob commands all expect at least
+one argument now.  *** POTENTIAL INCOMPATIBILITY ***
+21. 3/22/90 Added "?:" operators to expressions.
+22. 3/25/90 Fixed bug in Tcl_Result that caused memory to get trashed.
+------------------- Released version 3.1 ---------------------
+23. 3/29/90 Fixed bug that caused "file a.b/c ext" to return ".b/c".
+24. 3/29/90 Semi-colon is not treated specially when enclosed in
+double-quotes.
+------------------- Released version 3.2 ---------------------
+25. 4/16/90 Rewrote "exec" not to use select or signals anymore.
+Should be more Sys-V compatible, and no slower in the normal case.
+26. 4/18/90 Rewrote "glob" to eliminate GNU code (there's no GNU code
+left in Tcl, now), and added Tcl_TildeSubst procedure.  Added automatic
+tilde-substitution in many commands, including "glob".
+------------------- Released version 3.3 ---------------------
+27. 7/11/90 Added "Tcl_AppendResult" procedure.
+28. 7/20/90 "History" with no options now defaults to "history info"
+rather than to "history redo".  Although this is a backward incompatibility,
+it should only be used interactively and thus shouldn't present any
+compatibility problems with scripts.
+29. 7/20/90 Added "Tcl_GetInteger", "Tcl_GetDouble", and "Tcl_GetBoolean"
+procedures.
+30. 7/22/90 Removed "Tcl_WatchInterp" procedure:  doesn't seem to be
+necessary, since the same effect can be achieved with the deletion
+callbacks on individual commands.  *** POTENTIAL INCOMPATIBILITY ***
+31. 7/23/90 Added variable tracing:  Tcl_TraceVar, Tcl_UnTraceVar,
+and Tcl_VarTraceInfo procedures, "trace" command.
+32. 8/9/90 Mailed out list of all bug fixes since 3.3 release.
+33. 8/29/90 Fixed bugs in Tcl_Merge relating to backslashes and
+semi-colons.  Mailed out patch.
+34. 9/3/90 Fixed bug in tclBasic.c: quotes weren't quoting ]'s.
+Mailed out patch.
+35. 9/19/90 Rewrote exec to always use files both for input and
+output to the process.  The old pipe-based version didn't work if
+the exec'ed process forked a child and then exited:  Tcl waited
+around for stdout to get closed, which didn't happen until the
+grandchild exited.
+36. 11/5/90 ERR_IN_PROGRESS flag wasn't being cleared soon enough
+in Tcl_Eval, allowing error messages from different commands to
+pile up in $errorInfo.  Fixed by re-arranging code in Tcl_Eval that
+re-initializes result and ERR_IN_PROGRESS flag.  Didn't mail out
+patch:  changes too complicated to describe.
+37. 12/19/90 Added Tcl_VarEval procedure as a convenience for
+assembling and executing Tcl commands.
+38. 1/29/91 Fixed core leak in Tcl_AddErrorInfo.  Also changed procedure
+and Tcl_Eval so that first call to Tcl_AddErrorInfo need not come from
+Tcl_Eval.
+----------------- Released version 5.0 with Tk ------------------
+39. 4/3/91 Removed change bars from manual entries, leaving only those
+that came after version 3.3 was released.
+40. 5/17/91 Changed tests to conform to Mary Ann May-Pumphrey's approach.
+41. 5/23/91 Massive revision to Tcl parser to simplify the implementation
+of string and floating-point support in expressions.  Newlines inside
+[] are now treated as command separators rather than word separators
+(this makes newline treatment consistent throughout Tcl).
+*** POTENTIAL INCOMPATIBILITY ***
+42. 5/23/91 Massive rewrite of expression code to support floating-point
+values and simple string comparisons.  The C interfaces to expression
+routines have changed (Tcl_Expr is replaced by Tcl_ExprLong, Tcl_ExprDouble,
+etc.), but all old Tcl expression strings should be accepted by the new
+expression code.
+*** POTENTIAL INCOMPATIBILITY ***
+43. 5/23/91 Modified tclHistory.c to check for negative "keep" value.
+44. 5/23/91 Modified Tcl_Backslash to handle backslash-newline.  It now
+returns 0 to indicate that a backslash sequence should be replaced by
+no character at all.
+*** POTENTIAL INCOMPATIBILITY ***
+45. 5/29/91 Modified to use ANSI C function prototypes.  Must set
+"USE_ANSI" switch when compiling to get prototypes.
+46. 5/29/91 Completed test suite by providing tests for all of the
+built-in Tcl commands.
+47. 5/29/91 Changed Tcl_Concat to eliminate leading and trailing
+white-space in each of the things it concatenates and to ignore
+elements that are empty or have only white space in them.  This
+produces cleaner output from the "concat" command.
+*** POTENTIAL INCOMPATIBILITY ***
+48. 5/31/91 Changed "set" command and Tcl_SetVar procedure to return
+new value of variable.
+49. 6/1/91 Added "while" and "cd" commands.
+50. 6/1/91 Changed "exec" to delete the last character of program
+output if it is a newline.  In most cases this makes it easier to
+process program-generated output.
+*** POTENTIAL INCOMPATIBILITY ***
+51. 6/1/91 Made sure that pointers are never used after freeing them.
+52. 6/1/91 Fixed bug in TclWordEnd where it wasn't dealing with
+[] inside quotes correctly.
+53. 6/8/91 Fixed exec.test to accept return values of either 1 or
+255 from "false" command.
+54. 7/6/91 Massive overhaul of variable management.  Associative
+arrays now available, along with "unset" command (and Tcl_UnsetVar
+procedure).  Variable traces have been completely reworked:
+interfaces different both from Tcl and C, and multiple traces may
+exist on same variable.  Can no longer redefine existing local
+variable to be global.  Calling sequences have changed slightly
+for Tcl_GetVar and Tcl_SetVar ("global" is now "flags"). Tcl_SetVar
+can fail and return a NULL result.  New forms of variable-manipulation
+procedures:  Tcl_GetVar2, Tcl_SetVar2, etc.  Syntax of variable
+$-notation changed to support array indexing.
+*** POTENTIAL INCOMPATIBILITY ***
+55. 7/6/91 Added new list-manipulation procedures:  Tcl_ScanElement,
+Tcl_ConvertElement, Tcl_AppendElement.
+56. 7/12/91 Created new procedure Tcl_EvalFile, which does most of the
+work of the "source" command.
+57. 7/20/91 Major reworking of "exec" command to allow pipelines,
+more redirection, background.  Added new procedures Tcl_Fork,
+Tcl_WaitPids, Tcl_DetachPids, and Tcl_CreatePipeline.  The old
+"< input" notation has been replaced by "<< input" ("<" is for
+redirection from a file).  Also handles error returns and abnormal
+terminations (e.g. signals) differently.
+*** POTENTIAL INCOMPATIBILITY ***
+58. 7/21/91 Added "append" and "lappend" commands.
+59. 7/22/91 Reworked error messages and manual entries to use
+?x? as the notation for an optional argument x, instead of [x].  The
+bracket notation was often confused with the use of brackets for
+command substitution.  Also modified error messages to be more
+consistent.
+60. 7/23/91 Tcl_DeleteCommand now returns an indication of whether
+or not the command actually existed, and the "rename" command uses
+this information to return an error if an attempt is made to delete
+a non-existent command.
+*** POTENTIAL INCOMPATIBILITY ***
+61. 7/25/91 Added new "errorCode" mechanism, along with procedures
+Tcl_SetErrorCode, Tcl_UnixError, and Tcl_ResetResult.  Renamed
+Tcl_Return to Tcl_SetResult, but left a #define for Tcl_Return to
+avoid compatibility problems.
+62. 7/26/91 Extended "case" command with alternate syntax where all
+patterns and commands are together in a single list argument:  makes
+it easier to write multi-line case statements.
+63. 7/27/91 Changed "print" command to perform tilde-substitution on
+the file name.
+64. 7/27/91 Added "tolower", "toupper", "trim", "trimleft", and "trimright"
+options to "string" command.
+65. 7/29/91 Added "atime", "mtime", "size", and "stat" options to "file"
+command.
+66. 8/1/91 Added "split" and "join" commands.
+67. 8/11/91 Added commands for file I/O, including "open", "close",
+"read", "gets", "puts", "flush", "eof", "seek", and "tell".
+68. 8/14/91 Switched to use a hash table for command lookups.  Command
+abbreviations no longer have direct support in the Tcl interpreter, but
+it should be possible to simulate them with the auto-load features
+described below.  The "noAbbrev" variable is no longer used by Tcl.
+*** POTENTIAL INCOMPATIBILITY ***
+68.5 8/15/91 Added support for "unknown" command, which can be used to
+complete abbreviations, auto-load library files, auto-exec shell
+commands, etc.
+69. 8/15/91 Added -nocomplain switch to "glob" command.
+70. 8/20/91 Added "info library" option and TCL_LIBRARY #define.  Also
+added "info script" option.
+71. 8/20/91 Changed "file" command to take "option" argument as first
+argument (before file name), for consistency with other Tcl commands.
+*** POTENTIAL INCOMPATIBILITY ***
+72. 8/20/91 Changed format of information in $errorInfo variable:
+comments such as
+("while" body line 1)
+are now on separate lines from commands being executed.
+*** POTENTIAL INCOMPATIBILITY ***
+73. 8/20/91 Changed Tcl_AppendResult so that it (eventually) frees
+large buffers that it allocates.
+74. 8/21/91 Added "linsert", "lreplace", "lsearch", and "lsort"
+commands.
+75. 8/28/91 Added "incr" and "exit" commands.
+76. 8/30/91 Added "regexp" and "regsub" commands.
+77. 9/4/91 Changed "dynamic" field in interpreters to "freeProc" (procedure
+address).  This allows for alternative storage managers.
+*** POTENTIAL INCOMPATIBILITY ***
+78. 9/6/91 Added "index", "length", and "range" options to "string"
+command.  Added "lindex", "llength", and "lrange" commands.
+79. 9/8/91 Removed "index", "length", "print" and "range" commands.
+"Print" is redundant with "puts", but less general, and the other
+commands are replaced with the new commands described in change 78
+above.
+*** POTENTIAL INCOMPATIBILITY ***
+80. 9/8/91 Changed history revision to occur even when history command
+is nested;  needed in order to allow "history" to be invoked from
+"unknown" procedure.
+81. 9/13/91 Changed "panic" not to use vfprintf (it's uglier and less
+general now, but makes it easier to run Tcl on systems that don't
+have vfprintf).  Also changed "strerror" not to redeclare sys_errlist.
+82. 9/19/91 Lots of changes to improve portability to different UNIX
+systems, including addition of "config" script to adapt Tcl to the
+configuration of the system it's being compiled on.
+83. 9/22/91 Added "pwd" command.
+84. 9/22/91 Renamed manual pages so that their filenames are no more
+than 14 characters in length, moved to "doc" subdirectory.
+85. 9/24/91 Redid manual entries so they contain the supplemental
+macros that they need;  can just print with "troff -man" or "man"
+now.
+86. 9/26/91 Created initial version of script library, including
+a version of "unknown" that does auto-loading, auto-execution, and
+abbreviation expansion.  This library is used by tclTest
+automatically.  See the "library" manual entry for details.
+----------------- Released version 6.0, 9/26/91 ------------------
+87. 9/30/91 Made "string tolower" and "string toupper" check case
+before converting:  on some systems, "tolower" and "toupper" assume
+that character already has particular case.
+88. 9/30/91 Fixed bug in Tcl_SetResult:  wasn't always setting freeProc
+correctly when called with NULL value.  This tended to cause memory
+allocation errors later.
+89. 10/3/91 Added "upvar" command.
+90. 10/4/91 Changed "format" so that internally it converts %D to %ld,
+%U to %lu, %O to %lo, and %F to %f.  This eliminates some compatibility
+problems on some machines without affecting behavior.
+91. 10/10/91 Fixed bug in "regsub" that caused core dumps with the -all
+option when the last match wasn't at the end of the string.
+92. 10/17/91 Fixed problems with backslash sequences:  \r support was
+incomplete and \f and \v weren't supported at all.
+93. 10/24/91 Added Tcl_InitHistory procedure.
+94. 10/24/91 Changed "regexp" to store "-1 -1" in subMatchVars that
+don't match, rather than returning an error.
+95. 10/27/91 Modified "regexp" to return actual strings in matchVar
+and subMatchVars instead of indices.  Added "-indices" switch to cause
+indices to be returned.
+*** POTENTIAL INCOMPATIBILITY ***
+96. 10/27/91 Fixed bug in "scan" where it used hardwired constants for
+sizes of floats and doubles instead of using "sizeof".
+97. 10/31/91 Fixed bug in tclParse.c where parse-related error messages
+weren't being storage-managed correctly, causing spurious free's.
+98. 10/31/91 Form feed and vertical tab characters are now considered
+to be space characters by the parser.
+99. 10/31/91 Added TCL_LEAVE_ERR_MSG flag to procedures like Tcl_SetVar.
+100. 11/7/91 Fixed bug in "case" where "in" argument couldn't be omitted
+if all case branches were embedded in a single list.
+101. 11/7/91 Switched to use "pid_t" and "uid_t" and other official
+POSIC types and function prototypes.
+----------------- Released version 6.1, 11/7/91 ------------------
+102. 12/2/91 Modified Tcl_ScanElement and Tcl_ConvertElement in several
+ways.  First, allowed caller to request that only backslashes be used
+(no braces).  Second, made Tcl_ConvertElement more aggressive in using
+backslashes for braces and quotes.
+103. 12/5/91 Added "type", "lstat", and "readlink" options to "file"
+command, plus added new "type" element to output of "stat" and "lstat"
+options.
+104. 12/10/91 Manual entries had first lines that caused "man" program
+to try weird preprocessor.  Added blank comment lines to fix problem.
+105. 12/16/91 Fixed a few bugs in auto_mkindex proc:  wasn't handling
+errors properly, and hadn't been upgraded for new "regexp" syntax.
+106. 1/2/92 Fixed bug in "file" command where it didn't properly handle
+a file names containing tildes where the indicated user doesn't exist.
+107. 1/2/92 Fixed lots of cases in tclUnixStr.c where two different
+errno symbols (e.g. EWOULDBLOCK and EAGAIN) have the same number;  Tcl
+will only use one of them.
+108. 1/2/92 Lots of changes to configuration script to handle many more
+systems more gracefully.  E.g. should now detect the bogus strtoul that
+comes with AIX and substitute Tcl's own version instead.
+----------------- Released version 6.2, 1/10/92 ------------------
+109. 1/20/92 Config didn't have code to actually use "uid_t" variable
+to set TCL_UIT_T #define.
+110. 2/10/92 Tcl_Eval didn't properly reset "numLevels" variable when
+too-deep recursion occurred.
+111. 2/29/92 Added "on" and "off" to keywords accepted by Tcl_GetBoolean.
+112. 3/19/92 Config wasn't installing default version of strtod.c for
+systems that don't have one in libc.a.
+113. 3/23/92 Fixed bug in tclExpr.c where numbers with leading "."s,
+like 0.75, couldn't be properly substituted into expressions with
+variable or command substitution.
+114. 3/25/92 Fixed bug in tclUnixAZ.c where "gets" command wasn't
+checking to make sure that it was able to write the variable OK.
+115. 4/16/92 Fixed bug in tclUnixAZ.c where "read" command didn't
+compute file size right for device files.
+116. 4/23/92 Fixed but in tclCmdMZ.c where "trace vinfo" was overwriting
+the trace command.
+----------------- Released version 6.3, 5/1/92 ------------------
+117. 5/1/92 Added Tcl_GlobalEval.
+118. 6/1/92 Changed auto-load facility to source files at global level.
+119. 6/8/92 Tcl_ParseVar wasn't always setting termPtr after errors, which
+sometimes caused core dumps.
+120. 6/21/92 Fixed bug in initialization of regexp pattern cache.  This
+bug caused segmentation violations in regexp commands under some conditions.
+121. 6/22/92 Changed implementation of "glob" command to eliminate
+trailing slashes on directory names:  they confuse some systems.  There
+shouldn't be any user-visible changes in functionality except for names
+in error messages not having trailing slashes.
+122. 7/2/92 Fixed bug that caused 'string match ** ""' to return 0.
+123. 7/2/92 Fixed bug in Tcl_CreateCmdBuf where it wasn't initializing
+the buffer to an empty string.
+124. 7/6/92 Fixed bug in "case" command where it used NULL pattern string
+after errors in the "default" clause.
+125. 7/25/92 Speeded up auto_load procedure:  don't reread all the index
+files unless the path has changed.
+126. 8/3/92 Changed tclUnix.h to define MAXPATHLEN from PATH_MAX, not
+_POSIX_PATH_MAX.
+----------------- Released version 6.4, 8/7/92 ------------------
+127. 8/10/92 Changed tclBasic.c so that comment lines can be continued by
+putting a backslash before the newline.
+128. 8/21/92 Modified "unknown" to allow the source-ing of a file for
+an auto-load to trigger other nested auto-loads, as long as there isn't
+any recursion on the same command name.
+129. 8/25/92 Modified "format" command to allow " " and "+" flags, and
+allow flags in any order.
+130. 9/14/92 Modified Tcl_ParseVar so that it doesn't actually attempt
+to look up the variable if "noEval" mode is in effect in the interpreter
+(it just parses the name).  This avoids the errors that used to occur
+in statements like "expr {[info exists foo] && $foo}".
+131. 9/14/92 Fixed bug in "uplevel" command where it didn't output the
+correct error message if a level was specified but no command.
+132. 9/14/92 Renamed manual entries to have extensions like .3 and .n,
+and added "install" target to Makefile.
+133. 9/18/92 Modified "unknown" command to emulate !!, !<num>, and
+^<old>^<new> csh history substitutions.
+134. 9/21/92 Made the config script cleverer about figuring out which
+switches to pass to "nm".
+135. 9/23/92 Fixed tclVar.c to be sure to copy flags when growing variables.
+Used to forget about traces in progress and make extra recursive calls
+on trace procs.
+136. 9/28/92 Fixed bug in auto_reset where it was unsetting variables
+that might not exist.
+137. 10/7/92 Changed "parray" library procedure to print any array
+accessible to caller, local or global.
+138. 10/15/92 Fixed bug where propagation of new environment variable
+values among interpreters took N! time if there exist N interpreters.
+139. 10/16/92 Changed auto_reset procedure so that it also deletes any
+existing procedures that are in the auto_load index (the assumption is
+that they should be re-loaded to get the latest versions).
+140. 10/21/92 Fixed bug that caused lists to be incorrectly generated
+for elements that contained backslash-newline sequences.
+141. 12/9/92 Added support for TCL_LIBRARY environment variable:  use
+it as library location if it's present.
+142. 12/9/92 Added "info complete" command, Tcl_CommandComplete procedure.
+143. 12/16/92 Changed the Makefile to check to make sure "config" has been
+run (can't run config directly from the Makefile because it modifies the
+Makefile;  thus make has to be run again after running config).
+----------------- Released version 6.5, 12/17/92 ------------------
+144. 12/21/92 Changed config to look in several places for libc file.
+145. 12/23/92 Added "elseif" support to if.  Also, "then", "else", and
+"elseif" may no longer be abbreviated.
+*** POTENTIAL INCOMPATIBILITY ***
+146. 12/28/92 Changed "puts" and "read" to support initial "-nonewline"
+switch instead of additional "nonewline" argument.  The old form is
+still supported, but it is discouraged and is no longer documented.
+Also changed "puts" to make the file argument default to stdout: e.g.
+"puts foo" will print foo on standard output.
+147. 1/6/93 Fixed bug whereby backslash-newline wasn't working when
+typed interactively, or in "info complete".
+148. 1/22/93 Fixed bugs in "lreplace" and "linsert" where close
+quotes were being lost from last element before replacement or
+insertion.
+149. 1/29/93 Fixed bug in Tcl_AssembleCmd where it wasn't requiring
+a newline at the end of a line before considering a command to be
+complete.  The bug caused some very long lines in script files to
+be processed as multiple separate commands.
+150. 1/29/93 Various changes in Makefile to add more configuration
+options, simplify installation, fix bugs (e.g. don't use -f switch
+for cp), etc.
+151. 1/29/93 Changed "name1" and "name2" identifiers to "part1" and
+"part2" to avoid name conflicts with stupid C++ implementations that
+use "name1" and "name2" in a reserved way.
+152. 2/1/93 Added "putenv" procedure to replace the standard system
+version so that it will work correctly with Tcl's environment handling.
+----------------- Released version 6.6, 2/5/93 ------------------
+153. 2/10/93 Fixed bugs in config script:  missing "endif" in libc loop,
+and tried to use strncasecmp.c instead of strcasecmp.c.
+154. 2/10/93 Makefile improvements:  added RANLIB variable for easier
+Sys-V configuration, added SHELL variable for SGI systems.
+----------------- Released version 6.7, 2/11/93 ------------------
+153. 2/6/93 Changes in backslash processing:
+- \Cx, \Mx, \CMx, \e sequences no longer special
+- \<newline> also eats up any space after the newline, replacing
+the whole sequence with a single space character
+- Hex sequences like \x24 are now supported, along with ANSI C's \a.
+- "format" no longer does backslash processing on its format string
+- there is no longer any special meaning to a 0 return value from
+Tcl_Backslash
+- unknown backslash sequences, like (e.g. \*), are replaced with
+the following character (e.g. *), instead of just treating the
+backslash as an ordinary character.
+*** POTENTIAL INCOMPATIBILITY ***
+154. 2/6/93 Updated all copyright notices.  The meaning hasn't changed
+at all but the wording does a better job of protecting U.C. from
+liability (according to U.C. lawyers, anyway).
+155. 2/6/93 Changed "regsub" so that it overwrites the result variable
+in all cases, even if there is no match.
+*** POTENTIAL INCOMPATIBILITY ***
+156. 2/8/93 Added support for XPG3 %n$ conversion specifiers to "format"
+command.
+157. 2/17/93 Fixed bug in Tcl_Eval where errors due to infinite
+recursion could result in core dumps.
+158. 2/17/93 Improved the auto-load mechanism to deal gracefully (i.e.
+return an error) with a situation where a library file that supposedly
+defines a procedure doesn't actually define it.
+159. 2/17/93 Renamed Tcl_UnixError procedure to Tcl_PosixError, and
+changed errorCode variable usage to use POSIX as keyword instead of
+UNIX.
+*** POTENTIAL INCOMPATIBILITY ***
+160. 2/19/93 Changes to exec and process control:
+- Added support for >>, >&, >>&, |&, <@, >@, and >&@ forms of redirection.
+- When exec puts processes into background, it returns a list of
+their pids as result.
+- Added support for <file, >file, etc. (i.e. no space between
+">" and file name.
+- Added -keepnewline option.
+- Deleted Tcl_Fork and Tcl_WaitPids procedures (just use fork and
+waitpid instead).
+- Added waitpid compatibility procedure for systems that don't have
+it.
+- Added Tcl_ReapDetachedProcs procedure.
+- Changed "exec" to return an error if there is stderr output, even
+if the command returns a 0 exit status (it's always been documented
+this way, but the implementation wasn't correct).
+- If a process returns a non-zero exit status but doesn't generate
+any diagnostic output, then Tcl generates an error message for it.
+*** POTENTIAL INCOMPATIBILITY ***
+161. 2/25/93 Fixed two memory-management problems having to do with
+managing the old result during variable trace callbacks.
+162. 3/1/93 Added dynamic string library:  Tcl_DStringInit, Tcl_DStringAppend,
+Tcl_DStringFree, Tcl_DStringResult, etc.
+163. 3/1/93 Modified glob command to only return the names of files that
+exist, and to only return names ending in "/" if the file is a directory.
+*** POTENTIAL INCOMPATIBILITY ***
+164. 3/19/93 Modified not to use system calls like "read" directly,
+but instead to use special Tcl procedures that retry automatically
+if interrupted by signals.
+165. 4/3/93 Eliminated "noSep" argument to Tcl_AppendElement, plus
+TCL_NO_SPACE flag for Tcl_SetVar and Tcl_SetVar2.
+*** POTENTIAL INCOMPATIBILITY ***
+166. 4/3/93 Eliminated "flags" and "termPtr" arguments to Tcl_Eval.
+*** POTENTIAL INCOMPATIBILITY ***
+167. 4/3/93 Changes to expressions:
+- The "expr" command now accepts multiple arguments, which are
+concatenated together with space separators.
+- Integers aren't automatically promoted to floating-point if they
+overflow the word size:  errors are generated instead.
+- Tcl can now handle "NaN" and other special values if the underlying
+library procedures handle them.
+- When printing floating-point numbers, Tcl ensures that there is a "."
+or "e" in the number, so it can't be treated as an integer accidentally.
+The procedure Tcl_PrintDouble is available to provide this function
+in other contexts.  Also, the variable "tcl_precision" can be used
+to set the precision for printing (must be a decimal number giving
+digits of precision).
+- Expressions now support transcendental and other functions, e.g. sin,
+acos, hypot, ceil, and round.  Can add new math functions with
+Tcl_CreateMathFunc().
+- Boolean expressions can now have any of the string values accepted
+by Tcl_GetBoolean, such as "yes" or "no".
+*** POTENTIAL INCOMPATIBILITY ***
+168. 4/5/93 Changed Tcl_UnsetVar and Tcl_UnsetVar2 to return TCL_OK
+or TCL_ERROR instead of 0 or -1.
+*** POTENTIAL INCOMPATIBILITY ***
+169. 4/5/93 Eliminated Tcl_CmdBuf structure and associated procedures;
+can use Tcl_DStrings instead.
+*** POTENTIAL INCOMPATIBILITY ***
+170. 4/8/93 Changed interface to Tcl_TildeSubst to use a dynamic
+string for buffer space.  This makes the procedure re-entrant and
+thread-safe, whereas it wasn't before.
+*** POTENTIAL INCOMPATIBILITY ***
+171. 4/14/93 Eliminated tclHash.h, and moved everything from it to
+tcl.h
+*** POTENTIAL INCOMPATIBILITY ***
+172. 4/15/93 Eliminated Tcl_InitHistory, made "history" command always
+be part of interpreter.
+*** POTENTIAL INCOMPATIBILITY ***
+173. 4/16/93 Modified "file" command so that "readable" option always
+exists, even on machines that don't support symbolic links (always returns
+same error as if the file wasn't a symbolic link).
+174. 4/26/93 Fixed bugs in "regsub" where ^ patterns didn't get handled
+right (pretended not to match when it really did, and looped infinitely
+if -all was specified).
+175. 4/29/93 Various improvements in the handling of variables:
+- Can create variables and array elements during a read trace.
+- Can delete variables during traces (note: unset traces will be
+invoked when this happens).
+- Can upvar to array elements.
+- Can retarget an upvar to another variable by re-issuing the
+upvar command with a different "other" variable.
+176. 5/3/93 Added Tcl_GetCommandInfo, which returns info about a Tcl
+command such as whether it exists and its ClientData.  Also added
+Tcl_SetCommandInfo, which allows any of this information to be modified
+and also allows a command's delete procedure to have a different
+ClientData value than its command procedure.
+177. 5/5/93 Added Tcl_RegExpMatch procedure.
+178. 5/6/93 Fixed bug in "scan" where it didn't properly handle
+%% conversion specifiers.  Also changed "scan" to use Tcl_PrintDouble
+for printing real values.
+179. 5/7/93 Added "-exact", "-glob", and "-regexp" options to "lsearch"
+command to allow different kinds of pattern matching.
+180. 5/7/93 Added many new switches to "lsort" to control the sorting
+process: "-ascii", "-integer", "-real", "-command", "-increasing",
+and "-decreasing".
+181. 5/10/93 Changes to file I/O:
+- Modified "open" command to support a list of POSIX access flags
+like {WRONLY CREAT TRUNC} in addition to current fopen-style
+access modes.  Also added "permissions" argument to set permissions
+of newly-created files.
+- Fixed Scott Bolte's bug (can close stdin etc. in application and
+then re-open them with Tcl commands).
+- Exported access to Tcl's file table with new procedures Tcl_EnterFile
+and Tcl_GetOpenFile.
+182. 5/15/93 Added new "pid" command, which can be used to retrieve
+either the current process id or a list of the process ids in a
+pipeline opened with "open |..."
+183. 6/3/93 Changed to use GNU autoconfig for configuration instead of
+the home-brew "config" script.  Also made many other configuration-related
+changes, such as using <unistd.h> instead of explicitly declaring system
+calls in tclUnix.h.
+184. 6/4/93 Fixed bug where core-dumps could occur if a procedure
+redefined itself (the memory for the procedure's body could get
+reallocated in the middle of evaluating the body);  implemented
+simple reference count mechanism.
+185. 6/5/93 Changed tclIndex file format in two ways:  (a) it's now
+eval-ed instead of parsed, which makes it 3-4x faster; (b) the entries
+in auto_index are now commands to evaluate, which allows commands to
+be loaded in different ways such as dynamic-loading of C code.  The
+old tclIndex file format is still supported.
+186. 6/7/93 Eliminated tclTest program, added new "tclsh" program
+that is more like wish (allows script files to be invoked automatically
+using "#!/usr/local/bin/tclsh", makes arguments available to script,
+etc.).  Added support for Tcl_AppInit plus default version;  this
+allows new Tcl applications to be created without modifying the
+main program for tclsh.
+187. 6/7/93 Fixed bug in TclWordEnd that kept backslash-newline from
+working correctly in some cases during interactive input.
+188. 6/9/93 Added Tcl_LinkVar and related procedures, which automatically
+keep a Tcl variable in sync with a C variable.
+189. 6/16/93 Increased maximum nesting depth from 100 to 1000.
+190. 6/16/93 Modified "trace var" command so that error messages from
+within traces are returned properly as the result of the variable
+access, instead of the generic "access disallowed by trace command"
+message.
+191. 6/16/93 Added Tcl_CallWhenDeleted to provide callbacks when an
+interpreter is deleted (same functionality as Tcl_WatchInterp, which
+used to exist in versions before 6.0).
+193. 6/16/93 Added "-code" argument to "return" command;  it's there
+primarily for completeness, so that procedures implementing control
+constructs can reflect exceptional conditions back to their callers.
+194. 6/16/93 Split up Tcl.n to make separate manual entries for each
+Tcl command.  Tcl.n now contains a summary of the language syntax.
+195. 6/17/93 Added new "switch" command to replace "case": allows
+alternate forms of pattern matching (exact, glob, regexp), replaces
+pattern lists with single patterns (but you can use "-" bodies to
+share one body among several patterns), eliminates "in" noise word.
+"Case" command is now obsolete.
+196. 6/17/93 Changed the "exec", "glob", "regexp", and "regsub" commands
+to include a "--" switch.  All initial arguments starting with "-" are now
+treated as switches unless a "--" switch is present to end the list.
+*** POTENTIAL INCOMPATIBILITY ***
+197. 6/17/93 Changed auto-exec so that the subprocess gets stdin, stdout,
+and stderr from the parent.  This allows truly interactive sub-processes
+(e.g. vi) to be auto-exec'ed from a tcl shell command line.
+198. 6/18/93 Added patchlevel.h, for use in coordinating future patch
+releases, and also added "info patchlevel" command to make the patch
+level available to Tcl scripts.
+199. 6/19/93 Modified "glob" command so that a leading "//" in a name
+gets left as is (this is needed for systems like Apollos where "//" is
+the super-root;  Tcl used to collapse the two slashes into a single
+slash).
+200. 7/7/93 Added Tcl_SetRecursionLimit procedure so that the maximum
+allowable nesting depth can be controlled for an interpreter from C.
+----------------- Released version 7.0 Beta 1, 7/9/93 ------------------
+201. 7/12/93 Modified Tcl_GetInt and tclExpr.c so that full-precision
+unsigned integers can be specified without overflow errors.
+202. 7/12/93 Configuration changes:  eliminate leading blank line in
+configure script;  provide separate targets in Makefile for installing
+binary and non-binary information; check for size_t and a few other
+potentially missing typedefs; don't put tclAppInit.o into libtcl.a;
+better checks for matherr support.
+203. 7/14/93 Changed tclExpr.c to check the termination pointer before
+errno after strtod calls, to avoid problems with some versions of
+strtod that set errno in unexpected ways.
+204. 7/16/93 Changed "scan" command to be more ANSI-conformant:
+eliminated %F, %D, etc., added code to ignore "l", "h", and "L"
+modifiers but always convert %e, %f, and %g with implicit "l";
+also added support for %u and %i.  Also changed "format" command
+to eliminate %D, %U, %O, and add %i.
+*** POTENTIAL INCOMPATIBILITY ***
+205. 7/17/93 Changed "uplevel" and "upvar" so that they can be used
+from global level to global level:  this used to generate an error.
+206. 7/19/93 Renamed "setenv", "putenv", and "unsetenv" procedures
+to avoid conflicts with system procedures with the same names.  If
+you want Tcl's procedures to override the system procedures, do it
+in the Makefile (instructions are in the Makefile).
+*** POTENTIAL INCOMPATIBILITY ***
+----------------- Released version 7.0 Beta 2, 7/21/93 ------------------
+207. 7/21/93 Fixed bug in tclVar.c where freed memory was accidentally
+used if a procedure returned an element of a local array.
+208. 7/22/93 Fixed bug in "unknown" where it didn't properly handle
+errors occurring in the "auto_load" procedure, leaving its state
+inconsistent.
+209. 7/23/93 Changed exec's ">2" redirection operator to "2>" for
+consistency with sh.  This is incompatible with earlier beta releases
+of 7.0 but not with pre-7.0 releases, which didn't support either
+operator.
+210. 7/28/93 Changed backslash-newline handling so that the resulting
+space character *is* treated as a word separator unless the backslash
+sequence is in quotes or braces.  This is incompatible with 7.0b1
+and 7.0b2 but is more compatible with pre-7.0 versions that the b1
+and b2 releases were.
+211. 7/28/93 Eliminated Tcl_LinkedVarWritable, added TCL_LINK_READ_ONLY to
+Tcl_LinkVar to accomplish same purpose.  This change is incompatible
+with earlier beta releases, but not with releases before Tcl 7.0.
+212. 7/29/93 Renamed regexp C functions so they won't clash with POSIX
+regexp functions that use the same name.
+213. 8/3/93 Added "-errorinfo" and "-errorcode" options to "return"
+command: these allow for much better handling of the errorInfo
+and errorCode variables in some cases.
+214. 8/12/93 Changed "expr" so that % always returns a remainder with
+the same sign as the divisor and absolute value smaller than the
+divisor.
+215. 8/14/93 Turned off auto-exec in "unknown" unless the command
+was typed interactively.  This means you must use "exec" when
+invoking subprocesses, unless it's a command that's typed interactively.
+*** POTENTIAL INCOMPATIBILITY ***
+216. 8/14/93 Added support for tcl_prompt1 and tcl_prompt2 variables
+to tclMain.c:  makes prompts user-settable.
+217. 8/14/93 Added asynchronous handlers (Tcl_AsyncCreate etc.) so
+that signals can be taken cleanly by Tcl applications.
+218. 8/16/93 Moved information about open files from the interpreter
+structure to global variables so that a file can be opened in one
+interpreter and read or written in another.
+219. 8/16/93 Removed ENV_FLAGS from Makefile, so that there's no
+official support for overriding setenv, unsetenv, and putenv.
+220. 8/20/93 Various configuration improvements:  coerce chars
+to unsigned chars before using macros like isspace;  source ~/.tclshrc
+file during initialization if it exists and program is running
+interactively;  allow there to be directories in auto_path that don't
+exist or don't have tclIndex files (ignore them); added Tcl_Init
+procedure and changed Tcl_AppInit to call it.
+221. 8/21/93 Fixed bug in expr where "+", "-", and " " were all
+getting treated as integers with value 0.
+222. 8/26/93 Added "tcl_interactive" variable to tclsh.
+223. 8/27/93 Added procedure Tcl_FilePermissions to return whether a
+given file can be read or written or both.  Modified Tcl_EnterFile
+to take a permissions mask rather than separate read and write arguments.
+224. 8/28/93 Fixed performance bug in "glob" command (unnecessary call
+to "access" for each file caused a 5-10x slow-down for big directories).
+----------------- Released version 7.0 Beta 3, 8/28/93 ------------------
+225. 9/9/93 Renamed regexp.h to tclRegexp.h to avoid conflicts with system
+include file by same name.
+226. 9/9/93 Added Tcl_DontCallWhenDeleted.
+227. 9/16/93 Changed not to call exit C procedure directly;  instead
+always invoke "exit" Tcl command so that application can redefine the
+command to do additional cleanup.
+228. 9/17/93 Changed auto-exec to handle names that contain slashes
+(i.e. don't use PATH for them).
+229. 9/23/93 Fixed bug in "read" and "gets" commands where they didn't
+clear EOF conditions.
+----------------- Released version 7.0, 9/29/93 ------------------
+230. 10/7/93 "Scan" command wasn't properly aligning things in memory,
+so segmentation faults could arise under some circumstances.
+231. 10/7/93 Fixed bug in Tcl_ConvertElement where it forgot to
+backslash leading curly brace when creating lists.
+232. 10/7/93 Eliminated dependency of tclMain.c on tclInt.h and
+tclUnix.h, so that people can copy the file out of the Tcl source
+directory to make modified private versions.
+233. 10/8/93 Fixed bug in auto-loader that reversed the priority order
+of entries in auto_path for new-style index files.  Now things are
+back to the way they were before 3.0:  first in auto_path is always
+highest priority.
+234. 10/13/93 Fixed bug where Tcl_CommandComplete didn't recognize
+comments and treat them as such.  Thus if you typed the line
+# {
+interactively, Tcl would think that the command wasn't complete and
+wait for more input before evaluating the script.
+235. 10/14/93 Fixed bug where "regsub" didn't set the output variable
+if the input string was empty.
+236. 10/23/93 Fixed bug where Tcl_CreatePipeline didn't close off enough
+file descriptors in child processes, causing children not to exit
+properly in some cases.
+237. 10/28/93 Changed "list" and "concat" commands not to generate
+errors if given zero arguments, but instead to just return an empty
+string.
+----------------- Released version 7.1, 11/4/93 ------------------
+Note: there is no 7.2 release.  It was flawed and was thus withdrawn
+shortly after it was released.
+238. 11/10/93 TclMain.c didn't compile on some systems because of
+R_OK in call to "access".  Changed to eliminate call to "access".
+----------------- Released version 7.3, 11/26/93 ------------------
+239. 11/6/93 Modified "lindex", "linsert", "lrange", and "lreplace"
+so that "end" can be specified as an index.
+240. 11/6/93 Modified "append" and "lappend" to allow only two
+words total (i.e., nothing to append) without generating an error.
+241. 12/2/93 Changed to use EAGAIN as the errno for non-blocking
+I/O instead of EWOULDBLOCK:  this should fix problem where non-blocking
+I/O didn't work correctly on System-V systems.
+242. 12/22/93 Fixed bug in expressions where cancelled evaluation
+wasn't always working correctly (e.g. "set one 1; eval {1 || 1/$one}"
+failed with a divide by zero error).
+243. 1/6/94 Changed TCL_VOLATILE definition from -1 to the address of
+a dummy procedure Tcl_Volatile, since -1 causes portability problems on
+some machines (e.g., Crays).
+244. 2/4/94 Added support for unary plus.
+245. 2/17/94 Changed Tcl_RecordAndEval and "history" command to
+call Tcl_GlobalEval instead of Tcl_Eval.  Otherwise, invocation of
+these facilities in nested procedures can cause unwanted results.
+246. 2/17/94 Fixed bug in tclExpr.c where an expression such as
+"expr {"12398712938788234-1298379" != ""}" triggers an integer
+overflow error for the number in quotes, even though it isn't really
+a proper integer anyway.
+247. 2/19/94 Added new procedure Tcl_DStringGetResult to move result
+from interpreter to a dynamic string.
+248. 2/19/94 Fixed bug in Tcl_DStringResult that caused it to overwrite
+the contents of a static result in some situations.  This can cause
+bizarre errors such as variables suddenly having empty values.
+249. 2/21/94 Fixed bug in Tcl_AppendElement, Tcl_DStringAppendElement,
+and the "lappend" command that caused improper omission of a separator
+space in some cases.  For example, the script
+set x "abc{"; lappend x "def"
+used to return the result "abc{def" instead of "abc{ def".
+250. 3/3/94 Tcl_ConvertElement was outputting empty elements as \0 if
+TCL_DONT_USE_BRACES was set.  This depends on old pre-7.0 meaning of
+\0, which is no longer in effect, so it didn't really work.  Changed
+to output empty elements as {} always.
+251. 3/3/94 Renamed Tcl_DStringTrunc to Tcl_DStringSetLength and extended
+it so that it can be used to lengthen a string as well as shorten it.
+Tcl_DStringTrunc is defined as a macro for backward compatibility, but
+it is deprecated.
+252. 3/3/94 Added Tcl_AllowExceptions procedure.
+253. 3/13/94 Fixed bug in Tcl_FormatCmd that could cause "format"
+to mis-behave on 64-bit Big-Endian machines.
+254. 3/13/94 Changed to use vfork instead of fork on systems where
+vfork exists.
+255. 3/23/94 Fixed bug in expressions where ?: didn't associate
+right-to-left as they should.
+256. 4/3/94 Fixed "exec" to flush any files used in >@ or >&@
+redirection in exec, so that data buffered for them is written
+before any new data added by the subprocess.
+257. 4/3/94 Added "subst" command.
+258. 5/20/94 The tclsh main program is now called Tcl_Main;  tclAppInit.c
+has a "main" procedure that calls Tcl_Main.  This makes it easier to use
+Tcl with C++ programs, which need their own main programs, and it also
+allows an application to prefilter the argument list before calling
+Tcl_Main.
+*** POTENTIAL INCOMPATIBILITY ***
+259. 6/6/94 Fixed bug in procedure returns where the errorInfo variable
+could get truncated if an unset trace was invoked as part of returning
+from the procedure.
+260. 6/13/94 Added "wordstart" and "wordend" options to "string" command.
+261. 6/27/94 Fixed bug in expressions where they didn't properly cancel
+the evaluation of math functions in &&, ||, and ?:.
+262. 7/11/94 Incorrect boolean values, like "ogle", weren't being
+handled properly.
+263. 7/15/94 Added Tcl_RegExpCompile, Tcl_RegExpExec, and Tcl_RegExpRange,
+which provide lower-level access to regular expression pattern matching.
+264. 7/22/94 Fixed bug in "glob" command where "glob -nocomplain ~bad_user"
+would complain about a missing user.  Now it doesn't complain anymore.
+265. 8/4/94 Fixed bug with linked variables where they didn't behave
+correctly when accessed via upvars.
+266. 8/17/94 Fixed bug in Tcl_EvalFile where it didn't clear interp->result.
+267. 8/31/94 Modified "open" command so that errors in exec-ing
+subprocesses are returned by the open immediately, rather than
+being delayed until the "close" is executed.
+268. 9/9/94 Modified "expr" command to generate errors for integer
+overflow (includes addition, subtraction, negation, multiplication,
+division).
+269. 9/23/94 Modified "regsub" to return a count of the number of
+matches and replacements, rather than 0/1.
+279. 10/4/94 Added new features to "array" command:
+- added "get" and "set" commands for easy conversion between arrays
+and lists.
+- added "exists" command to see if a variable is an array, changed
+"names" and "size" commands to treat a non-existent array (or scalar
+variable) just like an empty one.
+- added pattern option to "names" command.
+280. 10/6/94 Modified Tcl_SetVar2 so that read traces on variables get
+called during append operations.
+281. 10/20/94 Fixed bug in "read" command where reading from stdin
+required two control-D's to stop the reading.
+282. 11/3/94 Changed "expr" command to use longs for division just like
+all other expr operators;  it previously used ints for division.
+283. 11/4/94 Fixed bugs in "unknown" procedure:  it wasn't properly
+handling exception returns from commands that were executed after
+being auto-loaded.
+----------------- Released version 7.4b1, 12/23/94 ------------------
+284. 12/26/94 Fixed "install" target in Makefile (couldn't always
+find install program).
+285. 12/26/94 Added strcncasecmp procedure to compat directory.
+286. 1/3/95 Fixed all procedure calls to explicitly cast arguments:
+implicit conversions from prototypes (especially integer->double)
+don't work when compiling under non-ANSI compilers.  Tcl is now clean
+under gcc -Wconversion.
+287. 1/4/95 Fixed problem in Tcl_ArrayCmd where same name was used for
+both a label and a variable;  caused problems on several older compilers,
+making array command misbehave and causing many errors in Tcl test suite.
+----------------- Released version 7.4b2, 1/12/95 ------------------
+288. 2/9/95 Modified Tcl_CreateCommand to return a token, and added
+Tcl_GetCommandName procedure.  Together, these procedures make it possible
+to track renames of a command.
+289. 2/13/95 Fixed bug in expr where "089" was interpreted as a
+floating-point number rather than a bogus octal number.
+*** POTENTIAL INCOMPATIBILITY ***
+290. 2/14/95 Added code to Tcl_GetInt and Tcl_GetDouble to check for
+overflows when reading in numbers.
+291. 2/18/95 Changed "array set" to stop after first error, rather than
+continuing after error.
+292. 2/20/95 Upgraded to use autoconf version 2.2.
+293. 2/20/95 Fixed core dump that could occur in "scan" command if a
+close bracket was omitted.
+294. 2/27/95 Changed Makefile to always use install-sh for installations:
+there's just too much variation among "install" system programs, which
+makes installation flakey.
+----------------- Released version 7.4b3, 3/24/95 ------------------
+3/25/95 (bug fix) Changed "install" to "./install" in Makefile so that
+"make install" will work even when "." isn't in the search path.
+3/29/95 (bug fix) Fixed bug where the auto-loading mechanism wasn't
+protecting the values of the errorCode and errorInfo variables.
+3/29/95 (new feature) Added optional pattern argument to "parray" procedure.
+3/29/95 (bug fix) Made the full functionality of
+"return -code ... -errorcode ..."
+work not just inside procedures, but also in sourced files and at
+top level.
+4/6/95 (new feature) Added "pattern" option to "array names" command.
+4/18/95 (bug fix) Fixed bug in parser where it didn't allow backslash-newline
+immediately after an argument in braces or quotes.
+4/19/95 (new feature) Added tcl_library variable, which application can
+set to override default library directory.
+4/30/95 (bug fix) During trace callbacks for array elements, the variable
+name used in the original reference would be temporarily modified to
+separate the array name and element name;  if the trace callback used
+the same name string, it would get the wrong name (the array name without
+element).  Fixed to restore the variable name before making trace
+callbacks.
+4/30/95 (new feature) Added -nobackslashes, -nocommands, and -novariables
+switches to "subst" command.
+5/4/95 (new feature) Added TCL_EVAL_GLOBAL flag to Tcl_RecordAndEval.
+5/5/95 (bug fix)  Format command would overrun memory when printing
+integers with very large precision, as in "format %.1000d 0".
+5/5/95 (portability improvement) Changed to use BSDgettimeofday on
+IRIX machines, to avoid compilation problems with the gettimeofday
+declaration.
+5/6/95 (bug fix) Changed manual entries to use the standard .TH
+macro instead of a custom .HS macro;  the .HS macro confuses index
+generators like makewhatis.
+5/9/95 (bug fix) Modified configure script to check for Solaris bug
+that makes vfork unreliable (core dumps result if vforked child
+changes a signal handler);  will use fork instead of vfork if the
+bug is present.
+6/5/95 (bug fix) Modified "lsort" command to disallow recursive calls
+to lsort from a comparison function.  This is needed because qsort
+is not reentrant.
+6/5/95 (bug fix) Undid change 243 above:  changed TCL_VOLATILE and
+TCL_DYNAMIC back to integer constants rather than procedure addresses.
+This was needed because procedure addresses can have multiple values
+under some dynamic loading systems (e.g. SunOS 4.1 and Windows).
+6/8/95 (feature change) Modified interface to Tcl_Main to pass in the
+address of the application-specific initialization procedure.
+Tcl_AppInit is no longer hardwired into Tcl_Main.  This is needed
+in order to make Tcl a shared library.
+6/8/95 (feature change) Modified Makefile so that the installed versions
+of tclsh and libtcl.a have version number in them (e.g. tclsh7.4 and
+libtcl7.4.a) and the library directory name also has an embedded version
+number (e.g., /usr/local/lib/tcl7.4).  This should make it easier for
+Tcl 7.4 to coexist with earlier versions.
+----------------- Released version 7.4b4, 6/16/95 ------------------
+6/19/95 (bug fix) Fixed bugs in tclCkalloc.c that caused core dumps
+if TCL_MEM_DEBUG was enabled on word-addressed machines such as Crays.
+6/21/95 (feature removal) Removed overflow checks for integer arithmetic:
+they just cause too much trouble (e.g. for random  number generators).
+6/28/95 (new features) Added tcl_patchLevel and tcl_version variables,
+for consistency with Tk.
+6/29/95 (bug fix) Fixed problem in Tcl_Eval where it didn't record
+the right termination character if a script ended with a comment.  This
+caused erroneous output for the following command, among others:
+puts "[
+expr 1+1
+# duh!
+]"
+6/29/95 (message change) Changed the error message for ECHILD slightly
+to provide a hint about why the problem is occurring.
+----------------- Released version 7.4, 7/1/95 ------------------
+7/18/95 (bug fix) Changed "lreplace" so that nothing is deleted if
+the last index is less than the first index or if the last index
+is < 0.
+7/18/95 (bug fix) Fixed bugs with backslashes in comments:
+Tcl_CommandComplete (and "info complete") didn't properly handle
+strings ending in backslash-newline, and neither Tcl_CommandComplete
+nor the Tcl parser handled other backslash sequences right, such
+as two backslashes before a newline.
+7/19/95 (bug fix) Modified Tcl_DeleteCommand to delete the hash table
+entry for the command before invoking its callback.  This is needed in
+order to deal with reentrancy.
+7/22/95 (bug fix) "exec" wasn't reaping processes correctly after
+certain errors (e.g. if the name of the executable was bogus, as
+in "exec foobar").
+7/27/95 (bug fix) Makefile.in wasn't using the LIBS variable provided
+by the "configure" script.  This caused problems on some SCO systems.
+7/27/95 (bug fix) The version of strtod in fixstrtod.c didn't properly
+handle the case where endPtr == NULL.
+----------------- Released patch 7.4p1, 7/29/95 -----------------------
+8/4/95 (bug fix) C-level trace callbacks for variables were sometimes
+receiving the PART1_NOT_PARSED flag, which could cause errors in
+subsequent Tcl library calls using the flags. (JO)
+8/4/95 (bug fix) Calls to toupper and tolower weren't using the
+UCHAR macros, which caused trouble in non-U.S. locales. (JO)
+8/10/95 (new feature) Added the "load" command for dynamic loading of
+binary packages, and the Tcl_PackageInitProc prototype for package
+initialization procedures. (JO)
+8/23/95 (new features) Added "info sharedlibextension" and
+"info nameofexecutable" commands, plus Tcl_FindExtension procedure. (JO)
+8/25/95 (bug fix) If the target of an "upvar" was non-existent but
+had traces set, the traces were silently lost.  Change to generate
+an error instead. (JO)
+8/25/95 (bug fix) Undid change from 7/19, so that commands can stay
+around while their deletion callbacks execute.  Added lots of code to
+handle all of the reentrancy problems that this opens up. (JO)
+8/25/95 (bug fix) Fixed core dump that could occur in TclDeleteVars
+if there was an upvar from one entry in the table to the next entry
+in the same table. (JO)
+8/28/95 (bug fix) Exec wasn't handling bad user names properly, as
+in "exec ~bogus_user/foo". (JO)
+8/29/95 (bug fixes) Changed backslash-newline handling to correct two
+problems:
+- Only spaces and tabs following the backslash-newline are now
+absorbed as part of the backslash-newline.  Newlinew are no
+longer absorbed (add another backslash if you want to absorb
+another newline).
+- TclWordEnd returns the character just before the backslash in
+the sequence as the end of the sequence;  it used to not consider
+the backslash-newline as a word separator. (JO)
+8/31/95 (new feature) Changed man page installation (with "mkLinks"
+script) to create additional links for manual pages corresponding to
+each of the procedure and command names described in the pages. (JO)
+9/10/95 Reorganized Tcl sources for Windows and Mac ports.  All sources
+are now in subdirectories:  "generic" contains sources that work on all
+platforms, "windows", "mac", and "unix" directories contain platform-
+specific sources.  Some UNIX sources are also used on other platforms. (SS)
+9/10/95 (feature change) Eliminated exported global variables (they
+don't work with Windows DLLs).  Replaced tcl_AsyncReady and
+tcl_FileCloseProc with procedures Tcl_AsyncReady() and
+Tcl_SetFileCloseProc().  Replaced C variable tcl_RcFileName with
+a Tcl variable tcl_rcFileName. (SS)
+*** POTENTIAL INCOMPATIBILITY ***
+9/11/95 (new feature) Added procedure Tcl_SetPanicProc to override
+the default implementation of "panic". (SS)
+9/11/95 (new feature) Added "interp" command to allow creation of
+new interpreters and execution of untrusted scripts.  Added many new
+procedures, such as Tcl_CreateSlave, Tcl_CreateAlias,and Tcl_MakeSafe,
+to provide C-level access to the interpreter facility. This mechanism
+now provides almost all of the generic functions of Borenstein's and
+Rose's Safe-Tcl (but not any Tk or email-related stuff).  (JL)
+9/11/95 (feature change) Changed file management so that files are
+no longer shared between interpreters:  a file cannot normally be
+referenced in one interpreter if it was opened in another.  This
+feature is needed to support safe interpreters.  Added Tcl_ShareHandle()
+procedure for allowing files to be shared, and added "interp" argument
+to Tcl_FilePermissions procedure. (JL)
+*** POTENTIAL INCOMPATIBILITY ***
+9/11/95 (new feature) Added "AssocData" mechanism, whereby extensions
+can associate their own data with an interpreter and get called back
+when the interpreter is deleted.  This is visible at C level via the
+procedures Tcl_SetAssocData and Tcl_GetAssocData.  (JL)
+9/11/95 (new feature) Added Tcl_ErrnoMsg to translate an errno value
+into a human-readable string.  This is now used instead of calling
+strerror because strerror mesages vary dramatically from platform
+to platform, which messes up Tcl tests.  Tcl_ErrnoMsg uses the standard
+POSIX messages for all the common signals, and calls strerror for
+signals it doesn't understand.
+----------------- Released patch 7.4p2, 9/15/95 -----------------------
+----------------- Released 7.5a1, 9/15/95 -----------------------
+9/22/95 (bug fix) Changed auto_mkindex to create tclIndex files that
+handle directories whose paths might contain spaces. (RJ)
+9/27/95 (bug fix) The "format" command didn't check for huge or negative
+width specifiers, which could cause core dumps. (JO)
+9/27/95 (bug fix) Core dumps could occur if an interactive command typed
+to tclsh returned a very long result for tclsh to print out.  The bug is
+actually in printf (in Solaris 2.3 and 2.4, at least);  switched to use
+puts instead.  (JO)
+9/28/95 (bug fix) Changed makefile.bc to eliminate a false dependency
+for tcl1675.dll on the Borland run time library. (SS)
+9/28/95 (bug fix) Fixed tcl75.dll so it looks for tcl1675.dll instead
+of tcl16.dll. (SS)
+9/28/95 (bug fix) Tcl was not correctly detecting the difference
+between Win32s and Windows '95. (SS)
+9/28/95 (bug fix) "exec" was not passing environment changes to child
+processes under Windows. (SS)
+9/28/95 (bug fix) Changed Tcl to ensure that open files are not passed
+to child processes under Windows. (SS)
+9/28/95 (bug fix) Fixed Windows '95 and NT versions of exec so it can
+handle both console and windows apps.   (SS)
+9/28/95 (bug fix) Fixed Windows version of exec so it no longer leaves
+temp files lying around.  Also changed it so the temp files are
+created in the appropriate system dependent temp directory. (SS)
+9/28/95 (bug fix) Eliminated source dependency on the Win32s Universal
+Thunk header file, since it is not bundled with VC++. (SS)
+9/28/95 (bug fix) Under Windows, Tcl now constructs the HOME
+environment variable from HOMEPATH and HOMEDRIVE when HOME is not
+already set. (SS)
+9/28/95 (bug fix) Added support for "info nameofexecutable" and "info
+sharedlibextension" to the Windows version. (SS)
+9/28/95 (bug fix) Changed tclsh to correctly parse command line
+arguments so that backslashes are preserved under Windows. (SS)
+9/29/95 (bug fix) Tcl 7.5a1 treated either return or newline as end
+of line in "gets", which caused lines ending in CRLF to be treated as
+two separate lines.  Changed to allow only character as end-of-line:
+carriage return on Macs, newline elsewhere. (JO)
+9/29/95 (new feature) Changed to install "configInfo" file in same
+directory as library scripts.  It didn't used to get installed. (JO)
+9/29/95 (bug fix) Tcl was not converting Win32 errors into POSIX
+errors under some circumstances. (SS)
+10/2/95 (bug fix) Safe interpreters no longer get initialized with
+a call to Tcl_Init(). (JL)
+10/1/95 (new feature) Added "tcl_platform" global variable to provide
+environment information such as the instruction set and operating
+system. (JO)
+10/1/95 (bug fix) "exec" command wasn't always generating the
+"child process exited abnormally" message when it should have.  (JO)
+10/2/95 (bug fix) Changed "mkLinks.tcl" so that the scripts it generates
+won't create links that overwrite original manual entries (there was
+a problem where pack-old.n was overwriting pack.n).  (JO)
+10/2/95 (feature change) Changed to use -ldl for dynamic loading under
+Linux if it is available, but fall back to -ldld if it isn't.  (JO)
+10/2/95 (bug fix) File sharing was causing refcounts to reach 0
+prematurely for stdin, stdout and stderr, under some circumstances. (JL)
+10/2/95 (platform support) Added support for Visual C++ compiler on
+Windows, Windows '95 and Windows NT, code donated by Gordon Chaffee. (JL)
+10/3/95 (bug fix) Tcl now frees any libraries that it loads before it
+exits. (SS)
+10/03/95 (bug fix) Fixed bug in Macintosh ls command where the -l
+and -C options would fail in anything but the HOME directory. (RJ)
+----------------- Released 7.5a2, 10/6/95 -----------------------
+10/10/95 (bug fix) "file dirnam /." was returning ":" on UNIX instead
+of "/". (JO)
+10/13/95 (bug fix) Eliminated dependency on MKS toolkit for generating
+the tcl.def file from Borland object files. (SS)
+10/17/95 (new features) Moved the event loop from Tcl to Tk, made major
+revisions along the way:
+- New Tcl commands:  after, update, vwait (replaces "tkwait variable").
+- "tkerror" is now replaced with "bgerror".
+- The following procedures are similar to their old Tk counterparts:
+Tcl_DoOneEvent, Tcl_Sleep, Tcl_DoWhenIdle, Tcl_CancelIdleCall,
+Tcl_CreateFileHandler, Tcl_DeleteFileHandler, Tcl_CreateTimerHandler,
+Tcl_DeleteTimerHandler, Tcl_BackgroundError.
+- Revised notifier, add new concept of "event source" with the following
+procedures:  Tcl_CreateEventSource, Tcl_DeleteEventSource,
+Tcl_WatchFile, Tcl_SetMaxBlockTime, Tcl_FileReady, Tcl_QueueEvent,
+Tcl_WaitForEvent. (JO)
+10/31/95 (new features) Implemented cross platform file name support to make
+it easier to write cross platform scripts.  Tcl now understands 4 file naming
+conventions: Windows (both DOS and UNC), Mac, Unix, and Network.  The network
+convention is a new naming mechanism that can be used to paths in a platform
+independent fashion.  See the "file" command manual page for more details.
+The primary interfaces changes are:
+- All Tcl commands that expect a file name now accept both network and
+native form.
+- Two new "file" subcommands, "nativename" and "networkname", provide a
+way to convert between network and native form.
+- Renamed Tcl_TildeSubst to Tcl_TranslateFileName, and changed it so that
+it always returns a filename in native form.  Tcl_TildeSubst is defined
+as a macro for backward compatibility, but it is deprecated. (SS)
+11/5/95 (new feature) Made "tkerror" and "bgerror" synonyms, so that
+either name can be used to manipulate the command (provides temporary
+backward compatibility for existing scripts that use tkerror). (JO)
+11/5/95 (new feature) Added exit handlers and new C procedures
+Tcl_CreateExitHandler, Tcl_DeleteExitHandler, and Tcl_Exit. (JO)
+11/6/95 (new feature) Added pid command for Macintosh version of
+Tcl (it didn't previously exist on the Mac). (RJ)
+11/7/95 (new feature) New generic IO facility and support for IO to
+files, pipes and sockets based on a common buffering scheme. Support
+for asynchronous (non-blocking) IO and for event driver IO. Support
+for automatic (background) asynchronous flushing and asynchronous
+closing of channels. (JL)
+11/7/95 (new feature)  Added new commands "fconfigure" and "fblocked"
+to support new I/O features such as nonblocking I/O.  Added "socket"
+command for creating TCP client and server sockets. (JL).
+11/7/95 (new feature) Complete set of C APIs to the new generic IO
+facility:
+- Opening channels: Tcl_OpenFileChannel, Tcl_OpenCommandChannel,
+Tcl_OpenTcpClient, Tcl_OpenTcpServer.
+- I/O procedures on channels, which roughly mirror the ANSI C stdio
+library:  Tcl_Read, Tcl_Gets, Tcl_Write, Tcl_Flush, Tcl_Seek,
+Tcl_Tell, Tcl_Close, Tcl_Eof, Tcl_InputBlocked, Tcl_GetChannelOption,
+Tcl_SetChannelOption.
+- Extension mechanism for creating new kinds of channels:
+Tcl_CreateChannel, Tcl_GetChannelInstanceData, Tcl_GetChannelType,
+Tcl_GetChannelName, Tcl_GetChannelFile, Tcl_RegisterChannel,
+Tcl_UnregisterChannel, Tcl_GetChannel.
+- Event-driven I/O on channels: Tcl_CreateChannelHandler,
+Tcl_DeleteChannelHandler. (JL)
+11/7/95 (new feature) Channel driver interface specification to allow
+new types of channels to be added easily to Tcl. Currently being used
+in three drivers - for files, pipes and TCP-based sockets. (JL).
+11/7/95 (new feature) interp delete now takes any number of path
+names of interpreters to delete, including zero. (JL).
+11/8/95 (new feature) implemented 'info hostname' and Tcl_GetHostName
+command to get host name of machine on which the Tcl process is running. (JL)
+11/9/95 (new feature) Implemented file APIs for access to low level files
+on each system. The APIs are: Tcl_CloseFile, Tcl_OpenFile, Tcl_ReadFile,
+Tcl_WriteFile and Tcl_SeekFile. Also implemented Tcl_WaitPid which waits
+in a system dependent manner for a child process. (JL)
+11/9/95 (new feature) Added Tcl_UpdateLinkedVar procedure to force a
+Tcl variable to be updated after its C variable changes. (JO)
+11/9/95 (bug fix) The glob command has been totally reimplemented so
+that it can support different file name conventions.  It now handles
+Windows file names (both UNC and drive-relative) properly.  It also
+supports nested braces correctly now. (SS)
+11/13/95 (bug fix) Fixed Makefile.in so that configure can be run
+from a clean directory separate from the Tcl source tree, and compilations
+can be performed there. (JO)
+11/14/95 (bug fix) Fixed file sharing between interpreters and file
+transferring between interpreters to correctly manage the refcount so that
+files are closed when the last reference to them is discarded. (JL)
+11/14/95 (bug fix) Fixed gettimeofday implementation for the
+Macintosh.  This fixes several timing related bugs. (RJ)
+11/17/95 (new feature) Added missing support for info nameofexecutable
+on the Macintosh. (RJ)
+11/17/95 (bug fix) The Tcl variables argc argv and argv0 now return
+something reasonable on the Mac.  (RJ)
+11/22/95 (new feature) Implemented "auto-detect" mode for end of line
+translations. On input, standalone "\r" mean MAC mode, standalone "\n"
+mean Unix mode and "\r\n" means Windows mode. On output, the mode is
+modified to whatever the platform specific mode for that platform is. (JL)
+11/24/95 (feature change) Replaced "configInfo" file with tclConfig.sh,
+which is more complete and uses slightly different names.  Also
+arranged for tclConfig.sh to be installed in the platform-specific
+library directory instead of Tcl's script library directory. (JO)
+*** POTENTIAL INCOMPATIBILITY with Tcl 7.5a2, but not with Tcl 7.4 ***
+----------------- Released patch 7.4p3, 11/28/95 -----------------------
+12/5/95 (new feature) Added Tcl_File facility to support platform-
+independent file handles.  Changed all interfaces that used Unix-
+style integer fd's to use Tcl_File's instead. (SS)
+*** POTENTIAL INCOMPATIBILITY ***
+12/5/95 (new feature) Added a new "clock" command to Tcl.  The command
+allows you to get the current "clicks" or seconds & allows you to
+format or scan human readable time/date strings. (RJ)
+12/18/95 (new feature) Moved Tk_Preserve, Tk_Release, and Tk_EventuallyFree
+to Tcl, renamed to Tcl_Preserve, Tcl_Release, and Tcl_EventuallyFree. (JO)
+12/18/95 (new feature) Added new "package" command and associated
+procedures Tcl_PkgRequire and Tcl_PkgProvide.   Also wrote
+pkg_mkIndex library procedure to create index files from binaries
+and scripts. (JO)
+12/20/95 (new feature) Added Tcl_WaitForFile procedure. (JO)
+12/21/95 (new features) Made package name argument to "load" optional
+(Tcl will now attempt to guess the package name if necessary).  Also
+added Tcl_StaticPackage and support in "load" for statically linked
+packages.  (JO)
+12/22/95 (new feature) Upgraded the foreach command to accept multiple
+loop variables and multiple value lists.  This lets you iterate over
+multiple lists in parallel, and/or assign multiple loop variables from
+one value list during each iteration. The only potential compatibility
+problem is with scripts that used loop variables with a name that could be
+construed to be a list of variable names (i.e. contained spaces).  (BW)
+1/5/96 (new feature) Changed tclsh so it builds as a console mode
+application under Windows.  Now tclsh can be used from the command
+line with pipes or interactively.  Note that this only works under
+Windows 95 or NT. (SS)
+1/17/96 (new feature) Modified Makefile and configure script to allow
+Tcl to be compiled as a shared library:  use the --enable-shared option
+when configuing.  (JO)
+1/17/96 (removed obsolete features)  Removed the procedures Tcl_EnterFile
+and Tcl_GetOpenFile:  these no longer make sense with the new I/O system. (JL)
+*** POTENTIAL INCOMPATIBILITY ***
+1/19/96 (bug fixes) Prevented formation of circular aliases, through the
+Tcl 'interp alias' command and through the 'rename' command, as well as
+through the C API Tcl_CreateAlias. (JL)
+1/19/96 (bug fixes) Fixed several bugs in direct deletion of interpreters
+with Tcl_DeleteInterp when the interpreter is a slave; fixes based on a
+patch received from Viktor Dukhovni of ESM. (JL)
+1/19/96 (new feature) Implemented on-close handlers for channels; added
+the C APIs Tcl_CreateCloseHandler and Tcl_DeleteCloseHandler. (JL)
+1/19/96 (new feature) Implemented portable error reporting mechanism; added
+the C APIs Tcl_SetErrno and Tcl_GetErrno. (JL)
+1/24/96 (bug fix) Unknown command processing properly invokes external
+commands under Windows NT and Windows '95 now. (SS)
+1/23/96 (bug fix) Eliminated extremely long startup times under Windows '95.
+The problem was a result of the option database initialization code that
+concatenated $HOME with /.Xdefaults, resulting in a // in the middle of the
+file name.  Under Windows '95, this is incorrectly interpreted as a UNC
+path.  They delays came from the network timeouts needed to determine that
+the file name was invalid.  Tcl_TranslateFileName now suppresses duplicate
+slashes that aren't at the beginning of the file name. (SS)
+1/25/96 (bug fix) Changed exec and open to create children so they are
+attached to the application's console if it exists. (SS)
+1/31/96 (bug fix) Fixed command line parsing to handle embedded
+spaces under Windows. (SS)
+----------------- Released 7.5b1, 2/1/96 -----------------------
+2/7/96 (bug fix) Fixed off by one error in argument parsing code under
+Windows. (SS)
+2/7/96 (bug fix) Fixed bugs in VC++ makefile that improperly
+initialized the tcl75.dll.  Fixed bugs in Borland makefile that caused
+build failures under Windows NT. (SS)
+2/9/96 (bug fix) Fixed deadlock problem in AUTO end of line translation
+mode which would cause a socket server with several concurrent clients
+writing in CRLF mode to hang. (JL)
+2/9/96 (API change) Replaced -linemode option to fconfigure with a
+new -buffering option, added "none" setting to enable immediate write. (JL)
+*** INCOMPATIBILITY with b1 ***
+2/9/96 (new feature) Added C API Tcl_InputBuffered which returns the count
+of bytes currently buffered in the input buffer of a channel, and o for
+output only channels. (JL)
+2/9/96 (new feature) Implemented asynchronous connect for sockets. (JL)
+2/9/96 (new feature) Added C API Tcl_SetDefaultTranslation to set (per
+channel) the default end of line translation mode. This is the mode that
+will be installed if an output operation is done on the channel while it is
+still in AUTO mode. (JL)
+2/9/96 (bug fix) Changed Tcl_OpenCommandChannel interface to properly
+handle all of the combinations of stdio inheritance in background
+pipelines.  See the Tcl_OpenFileChannel(3) man page for more
+info.  This change fixes the bug where exec of a background pipeline
+was not getting passed the stdio handles properly. (SS)
+2/9/96 (bug fix) Removed the new Tcl_CreatePipeline interface, and
+restored the old version for Unix platforms only.  All new code should
+use Tcl_CreateCommandChannel instead. (SS)
+2/9/96 (bug fix) Changed Makefile.in to use -L and -ltcl7.5 for Tcl
+library so that shared libraries are more likely to be found correctly
+on more platforms. (JO)
+2/13/96 (new feature) Added C API Tcl_SetNotifierData and
+Tcl_GetNotifierData to allow notifier and channel driver writers to
+associate data with a Tcl_File.  The result of this change is that
+Tcl_GetFileInfo now always returns an OS file handle, and Tcl_GetFile
+can be used to construct a Tcl_File for an externally constructed OS
+handle. (SS)
+2/13/96 (bug fix) Changed Windows socket implementation so it doesn't
+set SO_REUSEADDR on server sockets.  Now attempts to create a server
+socket on a port that is already in use will be properly identified
+and an error will be generated. (SS)
+2/13/96 (bug fix) Fixed problems with DLL initialization under Visual
+C++ that left the C run time library uninitialized. (SS)
+2/13/96 (bug fix) Fixed Windows socket initialization so it loads
+winsock the first time it is used, rather than at the time tcl75.dll
+is loaded.  This should fix the bug where the modem immediately starts
+trying to connect to a service provider when wish or tclsh are
+started. (SS)
+2/13/96 (new feature) Added C APIs Tcl_MakeFileChannel and
+Tcl_MakeTcpClientChannel to wrap up existing fds and sockets into
+channels. Provided implementations on Unix and Windows. (JL)
+2/13/96 (bug fix) Fixed bug with seek leaving EOF and BLOCKING set. (JL)
+2/14/96 (bug fix) Fixed reentrancy problem in fileevent handling
+and made it more robust in the face of errors. (JL)
+2/14/96 (feature change) Made generic IO level emulate blocking mode if the
+channel driver is unable to provide it, e.g. if the low level device is
+always nonblocking. Thus, now blocking behavior is an advisory setting for
+channel drivers and can be ignored safely if the channel driver is unable
+to provide it. (JL)
+2/15/96 (new feature) Added "binary" end of line translation mode, which is
+a synonym of "lf" mode. (JL)
+2/15/96 (bug fix) Fixed reentrancy problem in fileevent handling vs
+deletion of channel event handlers. (JL)
+2/15/96 (bug fix) Fixed bug in event handling which would cause a
+nonblocking channel to not see further readable events after the first
+readable event that had insufficient input. (JL)
+2/17/96 (bug fix) "info complete" didn't properly handle comments
+in nested commands. (JO)
+2/21/96 (bug fix) "exec" under Windows NT/95 did not properly handle
+very long command lines (>200 chars). (SS)
+2/21/96 (bug fix) Sockets could get into an infinite loop if a read
+event arrived after all of the available data had been read. (SS)
+2/22/96 (bug fix) Added cast of st_size elements to (long) before
+sprintf-ing in "file size" command.  This is needed to handle systems
+like NetBSD with 64-bit file offsets.  (JO)
+----------------- Released 7.5b2, 2/23/96 -----------------------
+2/23/96 (bug fix) TCL_VARARGS macro in tcl.h wasn't defined properly
+when compiling with C++.  (JO)
+2/24/96 (bug fix) Removed dependencies on Makefile in the UNIX Makefile:
+this caused problems on some platforms (like Linux?). (JO)
+2/24/96 (bug fix) Fixed configuration bug that made Tcl not compile
+correctly on Linux machines with neither -ldl or -ldld. (JO)
+2/24/96 (new feature) Added a block of comments and definitions to
+Makefile.in to make it easier to have Tcl's TclSetEnv etc. replace
+the library procedures setenv etc, so that calls to setenv etc. in
+the application automatically update the Tcl "env" variable. (JO)
+2/27/96 (feature change) Added optional Tcl_Interp * argument (may be NULL)
+to C API Tcl_Close and simplified closing of command channels. (JL)
+*** INCOMPATIBILITY with Tcl 7.5b2, but not with Tcl 7.4 ***
+2/27/96 (feature change) Added optional Tcl_Interp * argument (may be NULL)
+to C type definition Tcl_DriverCloseProc; modified all channel drivers to
+implement close procedures that accept the additional argument. (JL)
+*** INCOMPATIBILITY with Tcl 7.5b2, but not with Tcl 7.4 ***
+2/28/96 (bug fix) Fixed memory leak that could occur if an upvar
+referred to an element of an array in the same stack frame as the
+upvar. (JO)
+2/29/96 (feature change) Modified both Tcl_DoOneEvent and Tcl_WaitForEvent
+so that they return immediately in cases where they would otherwise
+block forever (e.g. if there are no event handlers of any sort). (JO)
+2/29/96 (new feature) Added C APIs Tcl_GetChannelBufferSize and
+Tcl_SetChannelBufferSize to set and retrieve the size, in bytes, for
+buffers allocated to store input or output in a channel. (JL)
+2/29/96 (new feature) Added option -buffersize to Tcl fconfigure command
+to allow Tcl scripts to query and set the size of channel buffers. (JL)
+2/29/96 (feature removed) Removed channel driver function to specify
+the buffer size to use when allocating a buffer. Removed the C typedef
+for Tcl_DriverBufferSizeProc. Channels are now created with a default
+buffer size of 4K. (JL)
+*** INCOMPATIBILITY with Tcl 7.5b2, but not with Tcl 7.4 ***
+2/29/96 (feature change) The channel driver function for setting blocking
+mode on the device may now be NULL. If the generic code detects that the
+function is NULL, operations that set the blocking mode on the channel
+simply succeed. (JL)
+3/2/96 (bug fix) Fixed core dump that could occur if a syntax error
+(such as missing close paren) occurred in an array reference with a
+very long array name. (JO)
+3/4/96 (bug fix) Removed code in the "auto_load" procedure that deletes
+all existing auto-load information whenever the "auto_path" variable
+is changed.  Instead, new information adds to what was already there.
+Otherwise, changing the "auto_path" variable causes all package-
+related information to be lost.  If you really want to get rid of
+existing auto-load information, use auto_reset before setting auto_path. (JO)
+3/5/96 (new feature) Added version suffix to shared library names so that
+Tcl will compile under NetBSD and FreeBSD (I hope).  (JO)
+3/6/96 (bug fix) Cleaned up error messages in new I/O system to correspond
+more closely to old I/O system. (JO)
+3/6/96 (new feature) Added -myaddr and -myport options to the socket
+command, removed -tcp and -- options.  This lets clients and servers
+choose a particular interface.  Also changed the default server address
+from the hostname to INADDR_ANY.  The server accept callback now gets
+passed the client's port as well as IP address.  The C interfaces for
+Tcl_OpenTcpClient and Tcl_OpenTcpServer have changed to support the
+above changes. (BW)
+*** POTENTIAL INCOMPATIBILITY with Tcl 7.5b2, but not with Tcl 7.4 ***
+3/6/96 (changed feature) The library function auto_mkindex will now
+default to using the pattern "*.tcl" if no pattern is given. (RJ)
+3/6/96 (bug fix) The socket channel code for the Macintosh has been
+rewritten to use native MacTcp.  (RJ)
+3/7/96 (new feature) Added Tcl_SetStdChannel and Tcl_GetStdChannel
+interfaces to allow applications to explicitly set and get the global
+standard channels. (SS)
+3/7/96 (bug fix) Tcl did close not the file descriptors associated
+with "stdout", etc. when the corresponding channels were closed.  (SS)
+3/7/96 (bug fix) Reworked shared library and dynamic loading stuff to
+try to get it working under AIX.  Added new @SHLIB_LD_LIBS@ autoconf
+symbol as part of this.  AIX probably doesn't work yet, but it should
+be a lot closer. (JO)
+3/7/96 (feature change) Added Tcl_ChannelProc typedef and changed the
+signature of Tcl_CreateChannelHandler and Tcl_DeleteChannelHandler to take
+Tcl_ChannelProc arguments instead of Tcl_FileProc arguments. This change
+should not affect any code outside Tcl because the signatures of
+Tcl_ChannelProc and Tcl_FileProc are compatible. (JL)
+3/7/96 (API change) Modified signature of Tcl_GetChannelOption to return
+an int instead of char *, and to take a Tcl_DString * argument. Modified
+the implementation so that the option name can be NULL, to mean that the
+call should retrieve a list of alternating option names and values. (JL)
+*** INCOMPATIBILITY with Tcl 7.5b2, but not with Tcl 7.4 ***
+3/7/96 (API change) Added Tcl_DriverSetOptionProc, Tcl_DriverGetOptionProc
+typedefs, added two slots setOptionProc and getOptionProc to the channel
+type structure. These may be NULL to indicate that the channel type does
+not support any options. (JL)
+*** INCOMPATIBILITY with Tcl 7.5b2, but not with Tcl 7.4 ***
+3/7/96 (feature change) stdin, stdout and stderr can now be put into
+nonblocking mode. (JL)
+3/8/96 (feature change) Eliminated dependence on the registry for
+finding the Tcl library files. (SS)
+----------------- Released 7.5b3, 3/8/96 -----------------------
+3/12/96 (feature improvement) Modified startup script to look in several
+different places for the Tcl library directory.  This should allow Tcl
+to find the libraries under all but the weirdest conditions, even without
+the TCL_LIBRARY environment variable being set. (JO)
+3/13/96 (bug fix) Eliminated use of the "linger" option from the Windows
+socket implementation. (JL)
+3/13/96 (new feature) Added -peername and -sockname options for fconfigure
+for socket channels. Code contributed by John Haxby of HP. (JL)
+3/13/96 (bug fix) Fixed panic and core dump that would occur if the accept
+callback script on a server socket encountered an error. (JL)
+3/13/96 (feature change) Added -async option to the Tcl socket command.
+If the command is creating a client socket and the flag is present, the
+client is connected asynchronously. If the option is absent (the default),
+the client socket is connected synchronously, and the command returns only
+when the connection has been completed or failed. This change was suggested
+by Mark Diekhans. (JL)
+3/13/96 (feature change) Modified the signature of Tcl_OpenTcpClient to
+take an additional int argument, async. If nonzero, the client is connected
+to the server asynchronously. If the value is zero, the connection is made
+synchronously, and the call to Tcl_OpenTcpClient returns only when the
+connection fails or succeeds. This change was suggested by Mark Diekhans. (JL)
+*** INCOMPATIBILITY with Tcl 7.5b3, but not with Tcl 7.4 ***
+3/14/96 (bug fix) "tclsh bogus_file_name" didn't print an error message. (JO)
+3/14/96 (bug fix) Added new procedures to tclCkalloc.c so that libraries
+and applications can be compiled with TCL_MEM_DEBUG even if Tcl isn't
+(however, the converse is still not true).  Patches provided by Jan
+Nijtmans. (JO)
+3/15/96 (bug fix) Marked standard IO handles of a process as close-on-exec
+to fix bug in Ultrix where exec was not sharing standard IO handles with
+subprocesses. Fix suggested by Mark Diekhans. (JL)
+3/15/96 (bug fix) Fixed asynchronous close mechanism so that it closes the
+channel instead of leaking system resources. The manifestation was that Tcl
+would eventually run out of file descriptors if it was handling a large
+number of nonblocking sockets or pipes with high congestion. (JL)
+3/15/96 (bug fix) Fixed tests so that they no longer leak file descriptors.
+The manifestation was that Tcl would eventually run out of file descriptors
+if the tests were rerun many times (> a hundred times on Solaris). (JL)
+3/15/96 (bug fix) Fixed channel creation code so that it never creates
+unnamed channels. This would cause a panic and core dump when the channel
+was closed. (JL)
+3/16/96 (bug fixes) Made lots of changes in configuration stuff to get
+Tcl working under AIX (finally).  Tcl should now support the "load"
+command under AIX and should work either with or without shared
+libraries for Tcl and Tk. (JO)
+3/21/96 (configuration improvement) Changed configure script so it
+doesn't use version numbers (as in -ltcl7.5 and libtcl7.5.so) under
+SunOS 4.1, where they don't work anyway.  (JO)
+3/22/96 (new feature) Added C API Tcl_InterpDeleted that allows extension
+writers to discover when an interpreter is being deleted. (JL)
+3/22/96 (bug fix) The standard IO channels are now added to each
+trusted interpreter as soon as the interpreter is created. This ensures
+against the bug where a child would do IO before the master had done any,
+and then the child is destroyed - the standard IO channels would be then
+closed and the master would be unable to do any IO. (JL)
+3/22/96 (bug fix) Made Tcl more robust against interpreter deletion, by
+using Tcl_Preserve, Tcl_Release and Tcl_EventuallyFree to split the process
+of interpreter deletion into two distinct phases. Also went through all of
+Tcl and added calls to Tcl_Preserve and Tcl_Delete where needed. (JL)
+3/22/96 (bug fix) Fixed several places where C code was reading and writing
+into freed memory, especially during interpreter deletion. (JL)
+3/22/96 (bug fix) Fixed very deep bug in Tcl_Release that caused memory to
+be freed twice if the release callback did Tcl_Preserve and Tcl_Release on
+the same memory as the chunk currently being freed. (JL)
+3/22/96 (bug fix) Removed several memory leaks that would cause memory
+buildup on half-K chunks in the generic IO level. (JL)
+3/22/96 (bug fix) Fixed several core dumps which occurred when new
+AssocData was being created during the cleanups in interpreter deletion.
+The solution implemented now is to loop repeatedly over the AssocData until
+none is left to clean up. (JL)
+3/22/96 (bug fix) Fixed a bug in event handling which caused an infinite
+loop if there were no files being watched and no timer. Fix suggested by
+Jan Nijtmans. (JL)
+3/22/96 (bug fix) Fixed Tcl_CreateCommand, Tcl_DeleteCommand to be more
+robust if the interpreter is being deleted. Also fixed several order
+dependency bugs in Tcl_DeleteCommand which kicked in when an interpreter
+was being deleted. (JL)
+3/26/96 (bug fix) Upon a "short read", the generic code no longer calls
+the driver for more input. Doing this caused blocking on some platforms
+even on nonblocking channels. Bug and fix courtesy Mark Roseman. (JL)
+3/26/96 (new feature) Added 'package Tcltest' which is present only in
+test versions of Tcl; this allows the testing commands to be loaded into
+new interpreters besides the main one. (JL)
+3/26/96 (restored feature) Recreated the Tcl_GetOpenFile C API. You can
+now get a FILE * from a registered channel; Unix only. (JL)
+3/27/96 (bug fix) The regular expression code did not support more
+than 9 subexpressions.  It now supports up to 20. (SS)
+4/1/96 (bug fixes) The CHANNEL_BLOCKED bit was being left on on a short
+read, so that fileevents wouldn't fire correctly. Bug reported by Mark
+Roseman.(JL, RJ)
+4/1/96 (bug fix) Moved Tcl_Release to match Tcl_Preserve exactly, in
+tclInterp.c; previously interpreters were being freed only conditionally
+and sometimes not at all. (JL)
+4/1/96 (bug fix) Fixed error reporting in slave interpreters when the
+error message was being generated directly by C code. Fix suggested by
+Viktor Dukhovni of ESM. (JL)
+4/2/96 (bug fixes) Fixed a series of bugs in Windows sockets that caused
+events to variously get lost, to get sent multiple times, or to be ignored
+by the driver. The manifestation was blocking if the channel is blocking,
+and either getting EAGAIN or infinite loops if the channel is nonblocking.
+This series of bugs was found by Ian Wallis of Cisco. Now all tests (also
+those that were previously commented out) in socket.test pass.  (JL, SS)
+4/2/96 (feature change/bug fix) Eliminated network name support in
+favor of better native name support.  Added "file split", "file join",
+and "file pathtype" commands.  See the "file" man page for more
+details. (SS)
+*** INCOMPATIBILITY with Tcl 7.5b3, but not with Tcl 7.4 ***
+4/2/96 (bug fix) Changed implementation of auto_mkindex so tclIndex
+files will properly handle path names in a cross platform context. (SS)
+4/5/96 (bug fix) Fixed Tcl_ReadCmd to use the channel buffer size as the
+chunk size it reads, instead of a fixed 4K size. Thus, on large reads, the
+user can set the channel buffer size to a large size and the read will
+occur orders of magnitude faster. For example, on a 2MB file, reading in 4K
+chunks took 34 seconds, while reading in 1MB chunks took 1.5 seconds (on a
+SS-20). Problem identified and fix suggested by John Haxby of HP. (JL)
+4/5/96 (bug fix) Fixed socket creation code to invoke gethostbyname only if
+inet_addr failed (very unlikely). Before this change the order was reversed
+and this made things much slower than they needed to be (gethostbyname
+generally requires an RPC, which is slow). Problem identified and fix
+suggested by John Loverso of OSF. (JL)
+4/9/96 (feature change) Modified "auto" translation mode so that it
+recognizes any of "\n", "\r" and "\r\n" in input as end of line, so
+that a file can have mixed end-of-line sequences. It now outputs
+the platform specific end of line sequence on each platform for files and
+pipes, and for sockets it produces crlf in output on all platforms. (JL)
+*** INCOMPATIBILITY with Tcl 7.5b3, but not with Tcl 7.4 ***
+4/11/96 (new feature) Added -eofchar option to Tcl_SetChannelOption to allow
+setting of an end of file character for input and output. If an input eof
+char is set, it is recognized as EOF and further input from the channel is
+not presented to the caller. If an output eof char is set, on output, that
+byte is appended to the channel when it is closed. On Unix and Macintosh,
+all channels start with no eof char set for input or output. On Windows,
+files and pipes start with input and output eof chars set to Crlt-Z (ascii
+26), and sockets start with no input or output eof char. (JL)
+*** INCOMPATIBILITY with Tcl 7.5b3, but not with Tcl 7.4 ***
+4/17/96 (bug fix) Fixed series of bugs with handling of crlf sequence split
+across buffer boundaries in input, in AUTO mode. (JL, BW)
+4/17/96 (test suite improvement) Fixed test suite so that tests that
+depend on the availability of Unix commands such as echo, cat and others
+are not run if these commands are not present. (JL)
+4/17/96 (test suite improvement) The socket test now automatically starts,
+on platformst that support exec, a separate process for remote testsing. (JL)
+----------------- Released 7.5, 4/21/96 -----------------------
+5/1/96 (bug fix) "file tail ~" did not correctly return the tail
+portion of the user's home directory. (SS)
+5/1/96 (bug fix) Fixed bug in TclGetEnv where it didn't lookup environment
+variables correctly:  could confuse "H" and "HOME", for example.  (JO)
+5/1/96 (bug fix) Changed to install tclConfig.sh under "make install-binaries",
+not "make install-libraries".  (JO)
+5/2/96 (bug fix) Changed pkg_mkIndex not to attempt to "load" a file unless
+it has the standard shared library extension.  On SunOS, attempts to load
+Tcl scripts cause the whole application to be aborted (there's no way to
+get the error back into Tcl).  (JO)
+5/7/96 (bug fix) Moved initScript in tclUnixInit.c to writable memory to
+avoid potential core dumps. (JO)
+5/7/96 (bug fix) Auto_reset procedure was removing procedure from init.tcl,
+such as pkg_mkIndex.  (JO)
+5/7/96 (bug fix) Fixed cast on socket address resolution code that
+would cause a failure to connect on Dec Alphas. (JL)
+5/7/96 (bug fix) Added "time", "subst" and "fileevent" commands to set of
+commands available in a safe interpreter. (JL)
+5/13/96 (bug fix) Preventing OS level handles for stdin, stdout and stderr
+from being implicitly closed when the last reference to the standard
+channel containing that handle is discarded when an interpreter is deleted.
+Explicitly closing standard channels by using "close" still works. (JL)
+5/21/96 (bug fix) Do not create channels for stdin, stdout and stderr on
+Unix if the devices are closed. This prevents a duplicate channel name
+panic later on when the fd is used to open a channel and the channel is
+registered in an interpreter. (JL)
+5/23/96 (bug fix) Fixed bug that prevented the use of standard channels in
+interpreters created after the last interpreter was destroyed. In the sequence
+	interp = Tcl_CreateInterp();
+	Tcl_DeleteInterp(interp);
+	interp = Tcl_CreateInterp();
+channels for stdio would not be available in the second interpreter. (JL)
+5/23/96 (bug fix) Fixed bug that allowed Tcl_MakeFileChannel to create new
+channels with Tcl_Files in them that are already used by another channel.
+This would cause core dumps when the Tcl_Files were being freed twice. (JL)
+5/23/96 (bug fix) Fixed a logical timing bug that caused a standard channel
+to be removed from the standard channel table too early when the channel
+was being closed. If the channel was being flushed asynchronously, it could
+get recreated before being actually destroyed, and the recreated channel
+would contain the same Tcl_File as the one being closed, leading to
+dangling pointers and core dumps. (JL)
+5/27/96 (bug fix) Fixed a bug in Tcl_GetChannelOption which caused it to
+always return a list of one element, a list of the settings, for
+-translation and -eofchar options. Now correctly returns the value
+described by the documentation (Mark Diekhans found this, thanks!). (JL)
+5/30/96 (bug fix) Fixed a couple of syntax errors in io.test. (JL)
+5/30/96 (bug fix) If a fileevent scripts gets an error, delete it before
+causing a background error. This is to allow the error handler to reinstall
+the fileevent and to prevent infinite loops if the event loop is reentered
+in the error handler. (JL)
+5/31/96 (bug fix) Channels now will get properly flushed on exit. (JL)
+6/5/96 (bug fix) Changed Tcl_Ckalloc, Tcl_Ckfree, and Tcl_Ckrealloc to
+Tcl_Alloc, Tcl_Free, and Tcl_Realloc.  Added documentation for these
+routines now that they are officially supported.  Extension writers
+should use these routines instead of free() and malloc(). (SS)
+6/10/96 (bug fix) Changes the Tcl close command so that it no longer
+waits on nonblocking pipes for the piped processes to exit; instead it
+reaps them in the background. (JL)
+6/11/96 (bug fix) Increased the length of the listen queue for server
+sockets on Unix from 5 to 100. Some OSes will disregard this and reset it
+to 5, but we should try to get as long a queue as we can, for performance
+reasons. (JL)
+6/11/96 (bug fix) Fixed windows sockets bug that caused a cascade of events
+if the fileevent script read less than was available. Now reading less than
+is available does not cause a flood of Tcl events. (JL, SS)
+6/11/96 (bug fix) Fixed bug in background flushing on closed channels that
+would prevent the last buffer from getting flushed. (JL)
+6/13/96 (bug fix) Fixed bug in Windows sockets that caused a core dump if
+a DLL linked with tcl.dll and referred to e.g. ntohs() without opening a
+Tcl socket. The problem was that the indirection table was not being
+initialized. (JL)
+6/13/96 (bug fix) Fixed OS level resource leak that would occur when a
+Tcl channel was still registered in some interpreter when the process
+exits. Previously the channel was not being closed and the OS level handles
+were not being released; the output was being flushed but the device was
+not being closed. Now the device is properly closed. This was only a
+problem on Win3.1 and MacOS. (JL, SS)
+6/28/96 (bug fix) Fixed bug where transient errors were leaving an error
+code around, so that it would erroneously get reported later. This bug was
+exercised intermittently by closing a channel to a file on a very loaded
+NFS server, or to a socket whose other end blocked. (JL, BW)
+7/3/96 (bug fix) Fileevents declared in an interpreter are now deleted
+when the channel is closed in that interpreter. Before this fix, the
+fileevent would hang around until the channel is completely closed, and
+would cause errors if events happened before the channel was closed. This
+could happen in two cases: first if the channel is shared between several
+interpreters, and second if an async flush is in progress that prevents the
+channel from being closed until the flush finishes. (JL)
+7/10/96 (bug fix) Fixed bugs in both "lrange" and "lreplace" commands
+where too much white space was being removed. For example, the command
+		lreplace {\}\     hello} end end
+was returning "\}\", losing the significant space in the first list
+element and corrupting the list. (JO)
+7/20/96 (bug fix) The procedure pkg_mkIndex didn't work properly for
+extensions that depend on Tk, because it didn't load Tk into the child
+interpreter before loading the extension.  Now it loads Tk if Tk is
+present in the parent. (JO)
+7/23/96 (bug fix) Added compat version of strftime to fix crashes
+resulting from bad implementations under Windows. (SS)
+7/23/96 (bug fix) Standard implementations of gmtime() and localtime()
+under Windows did not handle dates before 1970, so they were replaced
+with a revised implementation. (SS)
+7/23/96 (bug fix) Tcl would crash on exit under Borland 5.0 because
+the global environ pointer was left pointing to freed memory. (SS)
+7/29/96 (bug fix) Fixed memory leak in Tcl_LoadCmd that could occur if
+a package's AppInit procedure called Tcl_StaticPackage to register
+static packages. (JO)
+8/1/96 (bug fix) Fixed a series of bugs in Windows sockets so that async
+writebehind in the presence of read event handlers now works, and so that
+async writebehind also works on sockets for which a read event handler was
+declared and whose channels were then closed before the async write
+finished. The bug was reported by John Loverso and Steven Wahl,
+independently, test case supplied by John Loverso. (JL)
+----------------- Released patch 7.5p1, 8/2/96 -----------------------
+5/8/96 (new feature) Added Tcl_GetChannelMode C API for retrieving whether
+a channel is open for reading and writing. (JL)
+5/8/96 (API changes) Revised C APIs for channel drivers:
+- Removed all Tcl_Files from channel driver interface; you can now have
+channels that are not based on Tcl_Files.
+- Added channelReadyProc and watchChannelProc procedures to interface;
+these are used to implement event notification for channels.
+- Added getFileProc to channel driver, to allow the generic IO code
+to retrieve a Tcl_File from a channel (presumably if the channel
+uses Tcl_Files they will be stored inside its instanceData). (JL)
+*** INCOMPATIBILITY with Tcl 7.5 ***
+5/8/96 (API change) The Tcl_CreateChannel C API was modified to not take
+Tcl_File arguments, and instead to take a mask specifying whether the
+channel is readable and/or writable. (JL)
+*** INCOMPATIBILITY with Tcl 7.5 ***
+6/3/96 (bug fix) Made Tcl_SetVar2 robust against the case where the value
+of the variable is a NULL pointer instead of "". (JL)
+6/17/96 (bug fix) Fixed "reading uninitialized memory" error reported by
+Purify, in Tcl_Preserve/Tcl_Release. (JL)
+8/9/96 (bug fix) Fixed bug in init.tcl that caused incorrect error message
+if the act of autoloading a procedure caused the procedure to be invoked
+again. (JO)
+8/9/96 (bug fix) Configure script produced bad library names and extensions
+under SunOS and a few other platforms if the --disable-load switch was used.
+(JO)
+8/9/96 (bug fix) Tcl_UpdateLinkedVar generated an error if the variable
+being updated was read-only. (JO)
+8/14/96 (bug fix) The macintosh now supports synchronous socket
+connections.  Other minor bugs were also fixed. (RJ)
+8/15/96 (configuration improvement) Changed the file patchlevel.h
+to be tclPatch.h.  This avoids conflict with the Tk file and is now
+in 8.3 format on the Windows platform. (RJ)
+8/20/96 (bug fix) Fixed core dump in interp alias command for interpreters
+created with Tcl_CreateInterp (as opposed to with Tcl_CreateSlave). (JL)
+8/20/96 (bug fix) No longer masking ECONNRESET on Windows sockets so
+that the higher level of the IO mechanism sees the error instead of
+entering an infinite loop. (JL)
+8/20/96 (bug fix) Destroying the last interpreter no longer closes the
+standard channels. (JL)
+8/20/96 (bug fix) Closing one of the stdin, stdout or stderr channels and
+then opening a new channel now correctly assigns the new channel as the
+standard channel that was closed. (JL)
+8/20/96 (bug fix) Added code to unix/tclUnixChan.c for using ioctl with
+FIONBIO instead of fcntl with O_NONBLOCK, for those versions of Unix where
+either O_NONBLOCK is not supported or implemented incorrectly. (JL)
+8/21/96 (bug fix) Fixed "file extension" so it correctly returns the
+extension on files like "foo..c" as "..c" instead of ".c". (SS)
+8/22/96 (bug fix) If environ[] contains static strings, Tcl would core
+dump in TclSetupEnv because it was trying to write NULLs into the actual
+data in environ[]. Now we instead copy as appropriate. (JL)
+8/22/96 (added impl) Added missing implementation of Tcl_MakeTcpClientChannel
+for Windows platform. Code contributed by Mark Diekhans. (JL)
+8/22/96 (new feature) Added a new memory allocator for the Macintosh
+version of Tcl.  It's quite a bit faster than MetroWerk's version. (RJ)
+8/26/96 (documentation update) Removed old change bars (for all changes
+in Tcl 7.5 and earlier releases) from manual entries. (JO)
+8/27/96 (enhancement) The exec and open commands behave better and work in
+more situations under Windows NT and Windows 95.  Documentation describes
+what is still lacking. (CS)
+8/27/96 (enhancement) The Windows makefiles will now compile even if the
+compiler is not in the path and/or the compiler's environment variables
+have not been set up. (CS)
+8/27/96 (configuration improvement) The Windows resource files are
+automatically updated when the version/patch level changes.  The header file
+now has a comment that reminds the user which other files must be manually
+updated when the version/patch level changes. (CS)
+8/28/96 (new feature) Added file manipulation features (copy, rename, delete,
+mkdir) that are supported on all platforms. They are implemented as
+subcommands to the "file" command. See the documentation for the "file"
+command for more information. (JH)
+----------------- Released 7.6b1, 8/30/96 -----------------------
+9/3/96 (bug fix) Simplified code so that standard channels are created
+lazily, they are added to an interpreter lazily, and they are never added
+to a safe interpreter. (JL)
+9/3/96 (bug fix) Closing a channel after closing a standard channel, e.g.
+stdout, would cause the implicit recreation of that standard channel. (JL)
+9/3/96 (new feature) Now calling Tcl_RegisterChannel with a NULL
+interpreter increments the refcount so that code outside any interpreter
+can use channels that are also registered in interpreters, without worrying
+that the channel may turn into a dangling pointer at any time. Calling
+Tcl_UnregisterChannel with a NULL interpreter only decrements the recount
+so that code outside any interpreter can safely declare it is no longer
+interested in a channel. (JL)
+9/4/96 (new features) Two changes to dynamic loading:
+- If the file name is empty in the "load" command and there is no
+statically loaded version of the package, a dynamically loaded
+version will be used if there is one.
+- Tcl_StaticPackage ignores redundant calls for the same package. (JO)
+9/6/96 (bug fix) Platform specific procedures for manipulating files are
+no longer macros and have been prefixed with "Tclp", such as TclpRenameFile.
+Unix file code now handles symbolic links and other special files correctly.
+The semantics of file copy and file rename has been changed so that if
+a target directory exists, the source files will NOT be merged with the
+existing files. (JH)
+9/6/96 (bug fix) If standard channel is NULL, because Tcl cannot connect
+to the standard channel, do not increment the refcount. The channel can
+be NULL if there is for example no standard input. (JL)
+9/6/96 (portability improvement) Changed parsing of backslash sequences
+like \n to translate directly to absolute values like 0xa instead of
+letting the compiler do the translation.  This guarantees that the
+translation is done the same everywhere. (JO)
+9/9/96 (bug fix) If channel is opened and not associated with any
+interpreter, but Tcl decides to use it as one of the standard channels, it
+became impossible to close the channel with Tcl_Close -- instead you had
+to call Tcl_UnregisterChannel. Fixed now so that it's safe to call
+Tcl_Close even when Tcl is using the channel as one of the standard ones. (JL)
+9/11/96 (feature change) The Tcl library is now placed in the Tcl
+shared libraries resource.  You no longer need to place the Tcl files
+in your applications explicitly.  (RJ)
+9/11/96 (feature change) Extensions no longer automatically have the
+resource fork of the extension opened for it.  Instead you need to
+use the tclMacLibrary.c file in your extension.  (RJ)
+*** POTENTIAL INCOMPATIBILITY ***
+9/12/96 (bug fix) The extension loading mechanism on the Macintosh now
+looks at the 'cfrg' resource to determine where to load the code
+fragment from.  This means FAT fragments should now work. (RJ)
+9/18/96 (enhancement) The exec and open commands behave better and work in
+more situations under Windows 3.X.  Documentation describes what is still
+lacking.  (CS)
+9/19/96 (bug fix) Fixed a panic which would occur if you delete a
+non-existent alias before any aliases are created. Now instead correctly
+returns an error that the alias is not found. (JL)
+9/19/96 (bug fix) Slave interpreters could rename aliases and they would
+not get deleted when the alias was being redefined. This led to dangling
+pointers etc. (JL)
+9/19/96 (bug fix) Fixed a panic where a hash table entry was being deleted
+twice during alias management operations. (JL)
+9/19/96 (bug fix) Fixed bug in event loop that could cause the input focus
+in Tk to get confused during menu traversal, among other problems.  The
+problem was related to handling of the "marker" when its event was
+deleted. (JO)
+9/26/96 (bug fix) Windows was losing EOF on a socket if the FD_CLOSE event
+happened to precede any left over FD_READ events. Now correctly remembers
+seeing FD_CLOSE, so that trailing FD_READ events are not discarded if they
+do not contain any data. This allows Tcl to correctly get a zero read and
+notice EOF. (JL)
+9/26/96 (bug fix) Was not resetting READABLE state properly on sockets
+under Windows if the driver discarded an FD_READ event because no data was
+present. Now correctly resets the state. (JL)
+9/30/96 (bug fix) Made EOF sticky on Windows sockets, so that fileevent
+readable will fire repeatedly until the socket is closed. Previously the
+fileevent fired only once. This could lead to never-closed connections if
+the Tcl script in the fileevent wasn't closing the socket immediately. (JL)
+10/2/96 (new feature) Improved the package loader:
+- Added new variable tcl_pkgPath, which holds the default
+directories under which packages are normally installed (each
+package goes in a separate subdirectory of a directory in
+$tcl_pkgPath).  These directories are included in auto_path by
+default.
+- Changed the package auto-loader to look for pkgIndex.tcl files
+not only in the auto_path directories but also in their immediate
+children.  This should make it easier to install and uninstall
+packages (don't have to change auto_path or merge pkgIndex.tcl
+files). (JO)
+10/3/96 (bug fix) Changed tclsh to look for tclshrc.tcl instead of
+tclsh.rc on startup under Windows.  This is more consistent with wish and
+uses the right extension. (SS)
+*** POTENTIAL INCOMPATIBILITY ***
+10/8/96 (bug fix) Convertclock does not parse 24-hour times of the
+form "hhmm" correctly when hour = 00.  In the parse code, hour must be
+>= 100 for minutes to be non-zero.  Thanks to Lint LaCour for this
+bug fix. (RJ)
+10/11/96 (bug fix) Under Windows, the pid command returned the process
+handle instead of the process id. (SS)
+----------------- Released 7.6, 10/16/96 -----------------------
+10/29/96 (bug fix) Under Windows, sockets would consume 100% CPU time after
+the first accept(), due to a typo. (JL)
+10/29/96 (bug fix) Incorrect refcount management caused standard channels
+not to get deleted at process exit or DLL unload time, causing a memory
+leak of upwards of 20K each time. (JL)
+11/7/96 (bug fix) Auto-exec didn't work on file names that contained
+spaces. (JO)
+11/8/96 (bug fix) Fixed core dump that would occur if more than one call
+to Tcl_DeleteChannelHandler was made to delete a given channel handler. (JL)
+11/8/96 (bug fix) Fixed test for return value in Tcl_Seek and Tcl_SeekCmd
+to only treat -1 as error, instead of all negative numbers. (JL)
+11/12/96 (bug fix) Do not blocking waiting for processes at the end of a
+pipe during exit cleanup. (JL)
+11/12/96 (bug fix) If we are in exit cleanup, do not close the system level
+file descriptors 0, 1 and 2. Previously they were being closed which is
+incorrect, in the embedded case. This led to weird behavior for programs
+that want to interpose on I/O through the standard file descriptors (e.g.
+Netscape Navigator). (JL)
+11/15/96 (bug fix) Fixed core dump on Windows sockets due to dependency on
+deletion order at exit. Now all socket functions check to see if sockets
+are (still) initialized, before calling through function pointers. Before,
+they would call and might end up calling unloaded object code. (JL)
+11/15/96 (bug fix) Fixed core dump in Windows socket initialization routine
+if sockets were not installed on the system. Before, it was not properly
+checking the result of attempting to load the socket DLL, so it would call
+through uninitialized function pointers. (JL)
+11/15/96 (bug fix) Fixed memory leak in Windows sockets which left socket
+DLL handle open and could hold the socket DLL in memory uneccessarily,
+until a reboot. (JL)
+12/4/96 (bug fix) Fixed bug in Macintosh socket code that could result
+in lost data if a client was closed too soon after sending data. (RJ)
+12/17/96 (bug fix) Fixed deadlock bug in Windows sockets due to losing an
+event. This was happening because of an interaction between buffering and
+nonblocking mode on sockets. Now switched to sockets being blocking by
+default, so we are also no longer emulating blocking through a private
+event loop. (JL)
+1/21/97 (performance bug fix) Client TCP connections were slow to create
+because getservbyname was always called on the port.  Now this is only
+done if Tcl_GetInt fails. (BW)
+1/21/97 (configuration fix) Made it possible to override TCL_PACKAGE_PATH
+during make.  Previously it was only set during autoconf process.
+1/29/97 (bug fix) Fixed some problems with the clock command that
+impacted how dates were scaned after the year 2000. (RJ)
+----------------- Released 7.6p2, 1/31/97 -----------------------
+2/5/97 (bug fix) Fixed a bug where in CR-LF translation mode, \r bytes
+in the input stream were not being handled correctly. (JL)
+2/24/97 (bug fix) Fix bug with exec under Win32s not being able to create
+stderr file which caused all execs to fail.  Fixed temp file leak under
+Win32s.  Fixed optional parameter bug with SearchPath that only happened
+under Win32s 1.25. (CCS)
+----------------------------------------------------------
+Changes for Tcl 7.6 go above this line.
+Changes for Tcl 7.7 go below this line.
+----------------------------------------------------------
+5/8/96 (new feature) Added Tcl_Ungets C API for putting a sequence of bytes
+into a channel's input buffer. This can be used for "push" model channels
+where the input is obtained via callbacks instead of by request of the
+generic IO code. No Tcl procedure yet. (JL)
+11/15/96 (new feature) Implemented hidden commands. New C APIs:
+	Tcl_HideCommand		-- hides an existing exposed command.
+	Tcl_ExposeCommand	-- exposes an existing hidden command.
+New tcl APIs:
+	interp invokehidden	-- invokes a hidden command in a slave.
+	interp hide		-- hides an existing exposed command.
+	interp expose		-- exposes an existing hidden command.
+	interp hidden		-- returns a list of hidden commands.
+The implementation of Safe Tcl now uses the new hidden commands facility
+to implement the safe base, instead of deleting the commands from a safe
+interpreter. (JL)
+11/15/96 (new feature) Implemented the safe base, a mechanism for
+installing and requesting security policies, purely in Tcl code. Overloads
+the package command to also allow an interpreter to "require" a policy. The
+following new library commands are provided:
+	tcl_safeCreateInterp	-- creates a slave an initializes the
+				   policy mechanism.
+	tcl_safeInitInterp	-- initializes an existing slave with the
+				   policy mechanism.
+	tcl_safeDeleteInterp	-- deletes a slave and deinitializes the
+				   policy mechanism.
+Added a new file to the library, safeinit.tcl, to hold implementation. (JL)
+On 7/9/97, removed the policy loading mechanism from the Safe Base. Left
+only the Safe Base aliases dealing with auto-loading and source. (JL)
+12/6/96 (new feature) Implemented Tcl_Finalize, an API that should be
+called by a process when it is done using Tcl. This API runs all the exit
+handlers to allow them to clean up resources etc. (JL)
+12/17/96 (new feature) Add an http Tcl script package to the Tcl library.
+This package implements the client side of HTTP/1.0; the GET, HEAD,
+and POST requests. (BW)
+1/21/97 (new feature) Added a "marktrusted" subcommand to the "interp" and
+to the interpreter object command. It removes the "safe" mark on an
+interpreter and disables hard-wired checks for safety in the C sources. (JL)
+1/21/97 (removed feature) Removed "vwait" from set of commands available in
+a safe interpreter. (JL)
+2/11/97 (new feature, bug fix) http package.  Added -accept to http_config
+so you can set the Accept header.  Added -handler option to http_get so
+you can supply your own data handler.  Also fixed POST operation to
+set the correct MIME type on the request. (BW)
+----------------------------------------------------------
+Changes for Tcl 7.7 go above this line.
+Changes for Tcl 8.0 go below this line.
+----------------------------------------------------------
+9/17/96 (bug fix) Using "upvar" it was possible to turn an array element
+into an array itself.  Changed to disallow this; it was quirky and didn't
+really work correctly anyway. (JO)
+10/21/96 (new feature) The core of the Tcl interpreter has been replaced
+with an on-the-fly compiler that translates Tcl scripts to bytecoded
+instructions; a new interpreter then executes the bytecodes. The compiler
+introduces only a few minor changes at the level of Tcl scripts. The biggest
+changes are to expressions and lists.
+- A second level of substitutions is no longer done for expressions.
+This substantially improves their execution time. This means that
+the expression "$x*4" produces a different result than in the past
+if x is "$y+2". Fortunately, not much code depends on the old
+two-level semantics. Some expressions that do, such as
+"expr [join $list +]" can be recoded to work in Tcl8.0 by adding
+an eval: e.g., "eval expr [join $list +]".
+- Lists are now completely parsed on the first list operation to
+create a faster internal representation. In the past, if you had a
+misformed list but the erroneous part was after the point you
+inserted or extracted an element, then you never saw an error.
+In Tcl8.0 an error will be reported. This should only effect
+incorrect programs that took advantage of behavior of the old
+implementation that was not documented in the man pages.
+Other changes to Tcl scripts are discussed in the web page at
+http://www.scriptics.com/doc/compiler.html. (BL)
+*** POTENTIAL INCOMPATIBILITY ***
+10/21/96 (new feature) In earlier versions of Tcl, strings were used as a
+universal representation; in Tcl 8.0 strings are replaced with Tcl_Obj
+structures ("objects") that can hold both a string value and an internal
+form such as a binary integer or compiled bytecodes. The new objects make it
+possible to store information in efficient internal forms and avoid the
+constant translations to and from strings that occurred with the old
+interpreter. There are new many new C APIs for managing objects. Some of the
+new library procedures for objects (such as Tcl_EvalObj) resemble existing
+string-based procedures (such as Tcl_Eval) but take advantage of the
+internal form stored in Tcl objects for greater speed. Other new procedures
+manage objects and allow extension writers to define new kinds of objects.
+See the manual entries doc/*Obj*.3 (BL)
+10/24/96 (bug fix) Fixed memory leak on exit caused by some IO related
+data structures not being deallocated on exit because their refcount was
+artificially boosted. (JL)
+10/24/96 (bug fix) Fixed core dump in Tcl_Close if called with NULL
+Tcl_Channel. (JL)
+11/19/96 (new feature) Added library procedures for finding word
+breaks in strings in a platform specific manner.  See the library.n
+manual entry for more information. (SS)
+11/22/96 (feature improvements) Added support for different levels of
+tracing during bytecode compilation and execution. This should help in
+tracking down suspected problems with the compiler or with converting
+existing code to use Tcl8.0. Two global Tcl variables, traceCompile
+and traceExec, can be set to generate tracing information in stdout:
+- traceCompile: 0  no tracing (default)
+1  trace compilations of top level commands and procs
+2  trace and display instructions for all compilations
+- traceExec:    0  no tracing
+1  trace only calls to Tcl procs
+2  trace invocations of all commands including procs
+3  detailed trace showing the result of each instruction
+traceExec >= 2 provides a one line summary of each called command and
+its arguments. Commands that have been "compiled away" such as set are
+not shown. (BL)
+11/30/96 (bug fix) The command "info nameofexecutable" could sometimes
+return the name of a directory. (JO)
+11/30/96 (feature improvements) Changed the code in library/init.tcl
+that reads in pkgIndex.tcl so that (a) it reads the files from child
+directories before those in the parent, so that the parent gets
+precedence, and (b) it doesn't quit if there is an error in a
+pkgIndex.tcl file;  instead, it prints an error message on standard
+error and continues. (JO)
+10/5/96 (feature improvements) Partial implementation of binary string
+support: the ability for Tcl string values to contain embedded null bytes.
+Changed the Tcl object-based APIs to take a byte pointer and length pair
+instead of a null-terminated C string. Modified several object type managers
+to support binary strings but not, for example, the list type manager.
+Existing string-based C APIs are unchanged and will truncate binary
+strings. Compiled scripts containing nulls are also truncated. (BL)
+12/12/96 (feature change) Removed the commands "cp", "mkdir", "mv",
+"rm", and "rmdir" from the Macintosh version of Tcl.  They were never
+officially supported and their functionality is now available via
+the file command. (RJ)
+----------------- Released 8.0a1, 12/20/96 -----------------------
+1/7/97 (bug fix) Under Windows, "file stat c:" was returning error instead
+of stat for current dir on c: drive.
+1/10/97 (new feature) Added Tcl_GetIndexFromObj procedure for quick
+lookups of keyword arguments. (JO)
+1/12/97 (new feature) Serial IO channel drivers for Windows and Unix,
+available by using Tcl open command to open pseudo-files like "com1:" or
+"/dev/ttya".  New option to Tcl fconfigure command for serial files:
+"-mode baud,parity,data,stop" to specify baud rate, parity, data bits, and
+stop bits.  Serial IO is not yet available on Mac.
+1/16/97 (feature change) Restored the Tcl7.x "two level substitution
+semantics" for expressions. Expressions not enclosed in braces are
+implemented, in general, by calling the expr command procedure
+(Tcl_ExprObjCmd) at runtime after the Tcl interpreter has already done a
+first round of substitutions. This is slow (about Tcl7.x speed) because new
+code for the expression is generally compiled each time. However, if the
+expression has only variable substitutions (and not command substitutions),
+"optimistic" fast code is generated inline. This inline code will fail if a
+second round of substitutions is needed (i.e., if the value of a substituted
+variable itself requires more substitutions). The optimistic code will
+catch the error and back off to call the slower but guaranteed correct
+expr command procedure. (BL)
+1/16/97 (feature improvements) Added Tcl_ExprLongObj and Tcl_ExprDoubleObj
+to round out expression-related procedures. (BL)
+1/16/97 (feature change) Under Windows, at startup the environment variables
+"path", "comspec", and "windir" in any capitalization are converted
+automatically to upper case.  The PATH variable could be spelled as path,
+Path, PaTh, etc. and it makes programming rather annoying.  All other
+environment variables are left alone. (CS)
+1/20/97 (new features) Rewrote the "lsort" command:
+- The new version is based on reentrant merge sort code provided
+by Richard Hipp, so it eliminates the reentrancy and stability
+problems with the old qsort-based implementation.
+- The new version supports a -dictionary option for sorting, and
+it also supports a -index option for sorting lists using one
+element for comparison.
+- The new version is an object command, so it works well with the
+Tcl compiler, especially in conjunction with the new -index
+option.  When the -index option is used, this version of lsort
+is more than 100 times faster than the Tcl 7.6 lsort, which had
+to use the -command option to get the same effect. (JO)
+1/20/97 (feature improvements) Added the improved debugging support for Tcl
+objects prototyped by Karl Lehenbauer <karl@hammer1.ops.NeoSoft.com>.
+If TCL_MEM_DEBUG is defined, the object creation calls use Tcl_DbCkalloc
+directly in order to record the caller's source file name and line
+number. (BL)
+1/21/97 (removed feature) Desupported the tcl_precision variable: if
+set, it is ignored.  Tcl now uses the full 17 digits of precision when
+converting real numbers to strings (with the new object system real
+numbers are rarely converted to strings so there is no efficiency
+disadvantage to printing all 17 digits; the new scheme improves
+accuracy and simplifies several APIs). (JO)
+*** POTENTIAL INCOMPATIBILITY ***
+1/21/97 (feature change) Removed the "interp" argument for the
+procedures Tcl_GetStringFromObj, Tcl_StringObjAppend, and
+Tcl_StringObjAppendObj.  Also removed the "interp" argument for
+the updateStringProc procedure in Tcl_ObjType structures.  With
+the tcl_precision changes above, these are no longer needed. (JO)
+*** POTENTIAL INCOMPATIBILITY with Tcl 8.0a1, but not with Tcl 7.6 ***
+1/22/97 (bug fix) Fixed http.tcl so that http_reset does not result in
+an extra call to the command callback.  In addition, if the transaction
+gets a premature eof, the state(status) is "eof", not "ok". (BW)
+----------------- Released 8.0a2, 1/24/97 -----------------------
+1/29/97 (feature change) Changed how two digit years are parsed in the
+clock command.  The old interface just added 1900 which will seem
+broken by the year 2000.  The new scheme follows the POSIX standard
+and treats dates 70-99 as 1970-1999 and dates 00-38 as 2000-2038.  All
+other two digit dates are undefined. (RJ)
+*** POTENTIAL INCOMPATIBILITY ***
+2/4/97 (bug fix) Fixed bug in clock code that dealt with relative
+dates.  Using the relative month code you could get an invalid date
+because it jumped into a non-existant day.  (For example, Jan 31
+to Feb 31.)  The code now will return the last valid day of the
+month in these situations.  Thanks to Hume Smith for sending in
+this bug fix.  (RJ)
+2/10/97 (feature change) Eliminated Tcl_StringObjAppend and
+Tcl_StringObjAppendObj procedures, replaced them with Tcl_AppendToObj
+and Tcl_AppendStringsToObj procedures.  Added new procedure
+Tcl_SetObjLength. (JO)
+*** POTENTIAL INCOMPATIBILITY with Tcl 8.0a2, but not with Tcl 7.6 ***
+2/10/97 (new feature) Added Tcl_WrongNumArgs procedure for generating
+error messages about incorrect number of arguments. (JO)
+2/11/97 (new feature, bug fix) http package.  Added -accept to http_config
+so you can set the Accept header.  Added -handler option to http_get so
+you can supply your own data handler.  Also fixed POST operation to
+set the correct MIME type on the request. (BW)
+2/22/97 (bug fix) Fixed bug that caused $tcl_platform(osVersion) to be
+computed incorrectly under AIX. (JO)
+2/25/97 (new feature, feature change) Added support for both int and long
+integer objects. Added Tcl_NewLongObj/Tcl_GetLongFromObj/Tcl_SetLongFromObj
+procedures and renamed the Tcl_Obj internalRep intValue member to
+longValue. Tcl_GetIntFromObj now checks for integer values too large to
+represent as non-long integers. Changed Tcl_GetAllObjTypes to
+Tcl_AppendAllObjTypes. (BL)
+3/5/97 (new feature) Added new Tcl_SetListObj procedure to round out
+collection of procedures that set the type and value of existing Tcl
+objects. (BL)
+3/6/97 (new feature) Added -global flag for interp invokehidden. (JL)
+3/6/97 (new feature, feature change) Added isNativeObjectProc field to the
+Tcl_CmdInfo structure to indicate (when 1) if the command has an
+object-based command procedure. Removed the nameLength arg from
+Tcl_CreateObjCommand since command names can't contain null characters. (BL)
+3/6/97 (bug fix) Fixed bug in "unknown" procedure that caused auto-
+loading to fail on commands whose names begin with digits. (JO)
+3/7/97 (bug fix) Auto-loading now works in Safe Base. Safe interpreters
+only accept the Version 2 and onwards tclIndex files. (JL)
+3/13/97 (bug fix) Fixed core dump due to interaction between aliases and
+hidden commands. Bug found by Lindsay Marshall. (JL)
+3/14/97 (bug fix) Fixed mac bugs relating to time.  The -gmt option
+now adjusts the time in the correct direction.  (Thanks to Ed Hume for
+reporting a fix to this problem.)  Also fixed file "mtime" etc. to
+return times from GMT rather than local time zone.  (RJ)
+3/18/97 (feature change) Declaration of objv in Tcl_ObjCmdProc function
+changed from "Tcl_Obj *objv[]" to "Tcl_Obj *CONST objv[]".  All Tcl object
+commands changed to use new declaration of objv.  Naive translation of
+string-based command procs to object-based command procs could very easily
+have yielded code where the contents of the objv array were changed.  This
+is not a problem with string-based command procs, but doing something as
+simple as objv[2] = objv[3] would corrupt the runtime stack and cause Tcl to
+crash.  Introduced CONST in declaration of objv so that attempted assignment
+of new pointer values to elements of the objv array will be caught by the
+compiler. (CCS)
+*** POTENTIAL INCOMPATIBILITY with Tcl 8.0a2 ***
+3/19/97 (bug fix) Fixed panic due to object sharing. The root cause was
+that old code was using Tcl_ResetResult instead of Tcl_ResetObjResult. (JL)
+3/20/97 (new feature) Added a new subcommand for the file
+command. file attributes filename can give a list of platform-specific
+options (such as file/creator type on the Mac, permissions on Unix) or
+set the values of them. Added a new subcommand for the file
+command. file nativename name gives back the platform-specific form
+for the file. This is useful when the filename is needed to pass to
+the OS, such as exec under Windows 95 or AppleScript on the Mac. For
+more info, see file.n. (SRP)
+3/24/97 (removed feature) Removed the tcl_safePolicyPath procedure. Now
+the policy path is computed from the auto_path by appending the directory
+'policies' to each element. Also fixed several bugs in automatic tracking
+of auto_path by computed policy path. (JL)
+*** POTENTIAL INCOMPATIBILITY with Tcl 8.0a2 but not with Tcl 7.6 ***
+4/8/97 (new feature) If the variable whose name is passed to lappend doesn't
+already exist, and there are no value arguments, lappend now creates the
+variable with an empty value instead of returning an error. Change suggested
+by Tom Tromey. (BL)
+4/9/97 (feature change) Changed the name of the TCL_PART1_NOT_PARSED flag to
+TCL_PARSE_PART1. (BL)
+*** POTENTIAL INCOMPATIBILITY with Tcl 8.0a2 but not with Tcl 7.6 ***
+4/10/97 (bug fixes) Fixed various compilation-related bugs:
+- "UpdateStringOfCmdName should never be invoked" panic.
+- Bad code generated for expressions not in {}'s inside catch commands.
+- Segmentation fault in some command procedures when two argument
+object pointers refer to the same object.
+- Second level of substitutions were never done for expressions not
+in {}'s that consist of a single variable reference: e.g.,
+"set x 27; set bool {$x}; if $bool {puts foo}" would fail with error.
+- Bad code generated when code storage was grown while compiling some
+expressions: ones with compilation errors or consisting of only a
+variable reference.
+- Bugs involving multiple interpreters: wasn't checking that a
+procedure's code was compiled for the same interpreter as the one
+executing it, and didn't invalidate code on hidden-exposed command
+transitions.
+- "Bad stack top" panic when executing scripts that require a huge
+amount of stack space.
+- Incorrect sharing of code for procedure bodies, and procedure code
+deallocated before last execution of the procedure finished.
+- Fixed compilation of expression words in quotes. For example,
+if "0 < 3" {puts foo}.
+- Fixed performance bug in array set command with large assignments.
+- Tcl_SetObjLength segmentation fault setting length of empty object.
+- If Tcl_SetObjectResult was passed the same object as the interpreter's
+result object, it freed the object instead of doing nothing. Bug fix
+by Michael J. McLennan.
+- Tcl_ListObjAppendList inserted elements from the wrong list. Bug fix
+by Michael J. McLennan.
+- Segmentation fault if empty variable list was specified in a foreach
+command. Bug fix by Jan Nijtmans.
+- NULL command name was always passed to Tcl_CreateTrace callback
+procedure.
+- Wrong string representation generated for the value LONG_MIN.
+For example, expr 1<<31 printed incorrectly on a 32 bit machine.
+- "set {a($x)} 1" stored value in wrong variable.
+- Tcl_GetBooleanFromObj was not checking for garbage after a numeric
+value.
+- Garbled "bad operand type" error message when evaluating expressions
+not surrounded by {}'s. (BL)
+4/16/97 (new feature) The expr command now has the "rand()" and
+"srand()" functions for getting random numbers in expr. (RJ)
+4/23/97 (bug fix) Fixed core dump in bgerror when the error handler command
+deletes the current interpreter. Found by Juergen Schoenwald. (JL)
+4/23/97 (feature change) The notifier interfaces have been redesigned
+to make embedding in applications with external event loops possible.
+A number of interfaces in the notifier and the channel drivers have
+changed.  Refer to the Notifier.3 and CrtChannel.3 manual entries for
+more details. (SS)
+*** POTENTIAL INCOMPATIBILITY ***
+4/23/97 (removed feature) The Tcl_File interfaces have been removed.
+The Tcl_CreateFileHandler/Tcl_DeleteFileHandler interfaces now take
+Unix fd's and are only supported on the Unix platform.
+Tcl_GetChannelFile has been replaced with Tcl_GetChannelHandle.
+Tcl_MakeFileChannel now takes a platform specific file handle. (SS)
+*** POTENTIAL INCOMPATIBILITY ***
+4/23/97 (removed feature) The modal timeout interface has been
+removed (Tcl_CreateModalTimeout/Tcl_DeleteModalTimeout) (SS)
+*** POTENTIAL INCOMPATIBILITY ***
+4/23/97 (feature change) Channel drivers are now required to correctly
+implement blocking behavior when they are in blocking mode. (SS)
+*** POTENTIAL INCOMPATIBILITY ***
+4/23/97 (new feature) Added the "binary" command for manipulating
+binary strings. Also, changed the "puts", "gets", and "read" commands
+to preserve embedded nulls.  (SS)
+4/23/97 (new feature) Added tcl_platform(byteOrder) element to the
+tcl_platform array to identify the native byte order for the current
+host. (SS)
+4/23/97 (bug fix) Fixed bug in date parsing around year boundaries. (SS)
+4/24/97 (bug fix) In the process of copying a file owned by another user,
+Tcl was changing the owner of the copy back to the owner of the original
+file, therefore causing further file operations to fail because the current
+user didn't own the copy anymore.  The owner of the copy is now left as the
+current user. (CCS)
+4/24/97 (feature change) Under Windows, don't automatically uppercase the
+environment variable "windir" -- it's supposed to be lower case.  (CCS)
+4/29/97 (new feature) Added namespace support based on a namespace
+implementation by Michael J. McLennan of Lucent Technologies. A namespace
+encapsulates a collection of commands and variables to ensure that they
+won't interfere the commands and variables of other namespaces. The global
+namespace holds all global variables and commands. Additional namespaces are
+created with the new namespace command. The new variable command lets you
+create Tcl variables inside a namespace. The names of Tcl variables and
+commands may now be qualified by the name of the namespace containing them.
+The key namespace-related commands are summarized below:
+- namespace ?eval? name arg ?arg...?
+Used to define the commands and variables in a namespace.
+Optionally creates the namespace.
+- namespace export ?-clear? ?pattern pattern...?
+Specifies which commands are exported from a namespace. These
+are the ones that can be imported into another namespace.
+- namespace import ?-force? ?pattern pattern...?
+Makes the specified commands accessible in the current namespace.
+- namespace current
+Returns the name of the current namespace.
+- variable name ?value? ?name ?value?...?
+Creates one or more namespace variables. (BTL)
+5/1/97 (bug fix) Under Windows, file times were reported in GMT.  Should be
+reported in local time. (CCS)
+5/2/97 (feature change) Changed the name of the two Tcl variables used for
+tracing bytecode compilation and execution to tcl_traceCompile and
+tcl_traceExec respectively. These variables are now documented in the
+tclvars man page. (BL)
+5/5/97 (new feature) Support "end" as the index for "lsort -index". (BW)
+5/5/97 (bug fixes) Cleaned up the way the http package resets connections (BW)
+5/8/97 (feature change) Newly created Tcl objects now have a reference count
+of zero instead of one. This simplifies C code that stores newly created
+objects in Tcl variables or in data structures such as list objects. That C
+code must increment the new object's reference count since the variable or
+data structure will contain a long-term reference to the object. Formerly,
+when new objects started out with reference count one, it was necessary to
+decrement the new object's reference count after the store to make sure it
+was left with the correct value; this is no longer necessary. (BL)
+5/9/97 (new feature) Added the Tcl_GetsObj interface that takes an
+object reference instead of a dynamic string (as in Tcl_Gets). (SS)
+5/12/97 (new feature) Added Tcl_CreateAliasObj and Tcl_GetAliasObj C APIs
+to allow an alias command to be created with a vector of Tcl_Obj structures
+and to get the vector back later. (JL)
+5/12/97 (feature change) Changed Tcl_ExposeCommand and Tcl_HideCommand to
+leave an object result instead of a string result. (JL)
+5/14/97 (feature change) Improved the handling of the interpreter result.
+This is still either an object or a string, but the two values are now kept
+consistent unless some C code reads or writes interp->result directly. See
+the SetResult man page for details. Removed the Tcl_ResetObjResult
+procedure. (BL)
+*** POTENTIAL INCOMPATIBILITY with Tcl 8.0a2 ***
+5/16/97 (new feature) Added "fcopy" command to move data between
+channels.  Refer to the manual page for more information.  Removed the
+"unsupported0" command since it is obsolete now.  (SS)
+5/16/97 (new feature) Added Tcl_GetStringResult procedure to allow programs
+to get an interpreter's result as a string. If the result was previously set
+to an object, this procedure will convert the object to a string. Use of
+Tcl_GetStringResult is intended to replace direct access to interp->result,
+which is not safe. (BL)
+5/20/97 (new features) Fixed "fcopy" to return the number of bytes
+transferred in the blocking case.  Updated the http package to use
+fcopy instead of unsupported0.  Added -timeout and -handler options to
+http_get.  http_get is now blocking by default.  It is only non-blocking
+if you supply a -command argument. (BW)
+5/22/97 (bug fix) Fixed several bugs in the "lsort" command having to do
+with the -dictionary option and the presence of numbers embedded in the
+strings.  (JO)
+----------------- Released 8.0b1, 5/27/97 -----------------------
+6/2/97 (bug fix) Fixed bug in startup code that caused a problem in
+finding the library files when they are installed in a directory
+containing a space in the name. (SS)
+6/2/97 (bug fix) Fixed bug in Unix notifier where the select mask was
+not being cleared under some circumstances. (SS)
+6/4/97 (bug fix) Fixed bug that prevented creation of Tk widgets in
+namespaces. Tcl_CreateObjCommand and Tcl_CreateCommand now always create
+commands in the global namespace unless the command names are qualified. Tcl
+procedures continue to be created in the current namespace by default. (BL)
+6/6/97 (new features) Added new namespace API procedures
+Tcl_AppendExportList and Tcl_Export to allow C code to get and set a
+namespace's export list. (BL)
+6/11/97 (new feature) Added Tcl_ConcatObj. This object-based routine
+parallels the string-based routine Tcl_Concat. (SRP)
+6/11/97 (new feature) Added Tcl_SetObjErrorCode. This object-based
+routines parallels the string-based routine Tcl_SetErrorCode. (SRP)
+6/12/97 (bug fix) Fix the "unknown" procedure so that wish under Windows
+will exec an external program, instead of always complaining "console1 not
+opened for writing". (CCS)
+6/12/97 (bug fix) Fixed core dump experienced by the following simple
+script:
+	interp create x
+	x alias exec exec
+	interp delete x
+This panic was caused by not installing the new CmdDeleteProc when exec
+got redefined by the alias creation step. Reported by Lindsay Marshal (JL)
+6/13/97 (new features) Tcl objects newly created by Tcl_NewObj now have a
+string representation that points to a shared heap string of length 1. (They
+used to have NULL bytes and typePtr fields. This was treated as a special
+case to indicate an empty string, but made type manager implementations
+complex and error prone.) The new procedure Tcl_InvalidateStringRep is used
+to mark an object's string representation invalid and to free any storage
+associated with the old string representation. (BL)
+*** POTENTIAL INCOMPATIBILITY with Tcl 8.0b1, but not with Tcl7.6 ***
+6/16/97 (bug fix) Tcl_ScanCountedElement could leave braces unmatched
+if the string ended with a backslash. (JO)
+6/17/97 (bug fix) Fixed channel event bug where readable events would be
+lost during recursive events loops if the input buffers contained
+data. (SS)
+6/17/97 (bug fix) Fixed bug in Windows socket code that didn't
+reenable read events in the case where an external entity is also
+reading from the socket. (SS)
+6/18/97 (bug fix) Changed initial setting of the notifier service mode
+to TCL_SERVICE_NONE to avoid unexpected event handling during
+initialization. (SS)
+6/19/97 (bug fix/feature change) The command callback to fcopy is now
+called in case of errors during the background copy.  This adds a second,
+optional argument to the callback that is the error string.  The callback
+in case of errors is required for proper cleanup by the user of fcopy. (BW)
+*** POTENTIAL INCOMPATIBILITY with Tcl 8.0b1, but not with Tcl 7.6 ***
+6/19/97 (bug fix) Fixed a panic due to the following four line script:
+	interp create x
+	x alias foo bar
+	x eval rename foo blotz
+	x alias foo {}
+The problem was that the interp code was not using the actual current name
+of the command to be deleted as a result of un-aliasing foo. (JL)
+6/19/97 (feature change) Pass interp down to the ChannelOption and
+driver specific calls so system errors can be differentiated from syntax
+ones. Changed Tcl_DriverGetOptionProc type. Affects Tcl_GetChannelOption,
+TcpGetOptionProc,  TtyGetOptionProc, etc. (DL)
+*** POTENTIAL INCOMPATIBILITY ***
+6/19/97 (new feature) Added Tcl_BadChannelOption for use by by driver
+specific option procedures (Set and Get) to return a complete and
+meaningful error message. (DL)
+6/19/97 (bug fixes) If a system call error occurs while doing an
+fconfigure on tcp or tty/com channel: return the appropriate error
+message (instead of the syntax error one or none). (Fixed for Unix and
+most of the Win and Mac drivers). (DL)
+6/20/97 (feature change) Eval is no longer assumed as the subcommand name
+in namespace commands: you must now write "namespace eval nsName {...}".
+Abbreviations of namespace subcommand names are now allowed. (BL)
+*** POTENTIAL INCOMPATIBILITY with Tcl 8.0b1, but not with Tcl7.6 ***
+6/20/97 (feature change) Changed the errorInfo traceback message for
+compilation errors from "invoked from within" to "while compiling". (BL)
+6/20/97 (bug fixes) Fixed various compilation-related bugs:
+- "UpdateStringOfCmdName should never be called" and
+"UpdateStringOfByteCode should never be called" panics.
+- Segfault in TclObjInterpProc getting procedure name after evaluation
+stack is reallocated (grown).
+- Could not use ":" at end of variable and command names.
+- Bad code generated for while and for commands with test expressions
+enclosed in quotes: e.g., "set i 0; while "$i > 5" {}".
+- Command trace procedures would crash if they did a Tcl_EvalObj that
+reallocated the evaluation stack.
+- Break and continue commands did not reset the interpreter result.
+- The Tcl_ExprXXX routines, both string- or object-based, always
+modified the interpreter result even if there was no error.
+- The argument parsing procedure used by several compile procedures
+always treated "]" as end of a command: e.g., "set a ]" would fail.
+- Changed errorInfo traceback message for compilation errors from
+"invoked from within" to "while compiling".
+- Problem initializing Tcl object managers during interpreter creation.
+- Added check and error message if formal parameter to a procedure is
+an array element. (BL)
+6/23/97 (new feature) Added "registry" package to allow manipulation
+of the Windows system registry.  See manual entry for details. (SS)
+6/24/97 (feature change) Converted http to a package and added the
+http1.0 subdirectory of the Tcl script library.  This means you have
+to do a "package require http" to use this, as advertised in the man page. (BW)
+*** POTENTIAL INCOMPATIBILITY with Tcl 8.0b1, but not with Tcl 7.6 ***
+6/24/97 (bug fix) Ensure that Tcl_Set/GetVar C APIs, when called without
+TCL_LEAVE_ERR_MSG, don't touch the interp result. (DL)
+6/26/97 (feature change) Changed name of Tcl_ExprStringObj to
+Tcl_ExprObj. (BL)
+*** POTENTIAL INCOMPATIBILITY with Tcl 8.0b1, but not with Tcl 7.6 ***
+----------------- Released 8.0b2, 6/30/97 -----------------------
+7/1/97 (new feature) TCL_BUILD_SHARED flag set in tclConfig.sh
+when Tcl has been built with --enable-shared. A new tclLibObjs
+make target, echoing the list of the .o's needed to build a tcl
+library, is now provided. (DL)
+7/1/97 (feature change) compat/getcwd.c removed and changed the
+only place where getcwd is used so a new USEGETWD flag selects
+the use of the replacement "getwd". Adding this flag is recommended
+for SunOS 4 (because getcwd on SunOS 4 uses a pipe to pwd(1)!). (DL)
+7/7/97 (feature change) The split command now supports binary data (i.e.,
+null characters in strings). (BL)
+7/7/97 (bug fix) string first returned the wrong result if the first
+argument string was empty. (BL)
+7/8/97 (bug fix) Fixed core dump in fcopy that could occur when a command
+callback was supplied and an error or eof condition caused no background
+activity.  A refcount bug triggered a panic in Tcl_ListObjAppendElement. (BW)
+7/8/97 (bug fix) Relaxed the pattern matching on http_get so you do not
+need a trailing path component.  You can now get away with just
+http_get www.scriptics.com					(BW)
+7/9/97 (bug fix) Creating anonymous interpreters no longer smashes existing
+commands with names similar to the generated name. Previously creating an
+anonymous interpreter could smash an existing command, now it skips until
+it finds a command name that isn't being used. (JL)
+7/9/97 (feature change) Removed the policy management mechanism from the
+Safe Base; left the aliases to source and load modules, and to do a limited
+form of the "file" command. See entry of 11/15/96. (JL)
+7/9/97 (bug fixes) Fixed various compilation-related bugs:
+- Line numbers in errorInfo now are the same as those in Tcl7.6 unless
+there are compilation errors. Compilation error messages now include the
+entire command in error.
+- Trailing ::s after namespace names weren't being ignored.
+- Could not refer to an namespace variable with an empty name using a
+name of the form "n::". (BL)
+7/9/97 (bug fix) Fixed bug in Tcl_Export that prevented you from exporting
+from other than the current namespace. (BL)
+7/9/97 (bug fix) env.test was removing env var needed for proper finding
+of libraries in child process. (DL)
+7/10/97 (bug fixes/new feature) Cleanup in Tcl_MakeSafe. Less information
+is leaked to safe interps. Error message fixes for interp sub commands.
+Likewise changes in safealias.tcl; tcl_safeCreateInterp can now be called
+without argument to generate the slave name (like in interp create). (DL)
+7/10/97 (bug fixes) Bytecode compiler now generates more detailed
+command location information: subcommands as well as commands now have
+location information. This means command trace procedures now get the
+correct source string for each command in their command parameter. (BL)
+7/22/97 (bug fixes) Performance improvement in Safe interpreters
+handling. Added new mask value to (tclInt.h) Interp.flags record. (DL)
+7/22/97 (bug fix) Fixed panic in 'interp target {} foo'. This bug
+was present since Tcl 7.6. (JL)
+7/22/97 (bug fix) Fixed bug in compilation of procedures in namespaces: the
+procedure's namespace must be used to look up compile procedures, not the
+current namespace. (BL)
+7/22/97 (bug fix) Use of the -channel option of http_get was not setting
+the end of line translations mode on the channel, so copying binary data
+with the -channel option was corrupting the result on non-unix platforms. (BW)
+7/22/97 (bug fixes) file commands and ~user (seg fault and other
+improper returns). (DL)
+7/23/97 (feature change) Reenabled "vwait" in Safe Base. (JL)
+7/23/97 (bug fixes) Fixed two bugs involving read traces on array variables
+in procedures: trace procedures were sometimes not called, and reading
+nonexistant array elements didn't create undefined element variables that
+could later be defined by trace procedures. (BL)
+7/24/97 (bug fix) Windows memory allocation performance was
+superlinear in some cases.  Made the Mac allocator generic and changed
+both the Mac and Windows platforms to use the new allocator instead of
+malloc and free. (SS)
+7/24/97 - 8/12/97 (bug fixes/change of features) Completely revamped safe
+sourcing/loading (see safe.n) to hide pathnames, use virtual
+paths tokens instead, improved security in several respects and made it
+more tunable. Multi level interp loading can work too now. Package auto
+loading now works in safe interps as long as the package directory is in
+the auto_path (no deep crawling allowed in safe interps). (DL)
+*** POTENTIAL INCOMPATIBILITY with previous alpha and beta releases ***
+7/24/97 (bug fixes) Made Tcl_SetVar* and Tcl_NewString* treat a NULL value
+as an empty string. (This fixes hairy crash case where you would crash
+because load command for other interps assumed presence of
+errorInfo...). (DL)
+7/28/97 (bug fix) Fixed pkg_mkIndex to understand namespaces.  It will
+use the export list of a namespace and create auto_index entries for
+all export commands.  Those names are in their fully qualified form in the
+auto_index.  Therefore, I tweaked unknown to try both $cmd and ::$cmd.
+Also fixed pkg_mkIndex so you can have "package require" commands inside
+your packages.  These commands are ignored, which is mostly ok except
+when you must load another package before loading yours because of
+linking dependencies. (BW)
+7/28/97 (bug fix) A variable created by the variable command now persists
+until the namespace is destroyed or the variable is unset. This is true even
+if the variable has not been initialized; these variables used to be
+destroyed if an error occurred when accessing them. In addition, the "info
+vars" command lists uninitialized namespace variables, while the "info
+exists" command returns 0 for them. (BL)
+7/29/97 (feature change)  Changed the http package to use the ::http
+namespace. http_get renamed to http::geturl, http_config renamed to
+http::config, http_formatQuery renamed to http::formatQuery.
+It now provides the 2.0 version of the package.
+The 1.0 version is still available with the old names.
+*** POTENTIAL INCOMPATIBILITY with Tcl 8.0b2 but not with Tcl 7.6 ***
+7/29/97 (bug fix, new feature) Tcl_Main now uses Tcl objects internally to
+preserve NULLs in commands and command output. Added new API procedure
+Tcl_RecordAndEvalObj that resembles Tcl_RecordAndEval but takes an object
+containing a command. (BL)
+7/30/97 (bug fix) Tcl freed strings in the environ array even if it
+did not allocate them. (SS)
+7/30/97 (bug fix) If a procedure is renamed into a different namespace, it
+now executes in the context of that namespace. (BL)
+7/30/97 (bug fix) Prevent renaming of commands into and from namespaces as
+part of hiding them. (JL)
+7/31/97 (feature change) Moved the history command from C to tcl.
+This uses the ::history namespace.  The "words" and "substitute" options
+are no longer supported.  In addition, the "keep" option without a value
+returns the current keep limit.  There is a new "clear" option.
+The unknown command now supports !! again. (BW)
+*** POTENTIAL INCOMPATIBILTY  ***
+7/30/97 (bug fix) Made sure that a slave can not fool the master into
+hiding the wrong command. Made sure we don't crash in hiding + namespaces
+issues. (DL)
+8/4/97 (bug fix) Concat, eval, uplevel, and similar commands were
+incorrectly trimming trailing space characters from their arguments
+even when the space characters were preceded by a backslash. (JO)
+8/4/97 (bug fix) Removed the hard link between bgerror and tkerror.
+Only bgerror is supported in tcl core. Tk will still look for a
+tkerror but using regular tcl code for that feature. (DL)
+*** POTENTIAL INCOMPATIBILTY with code relying on the hard link ***
+8/6/97 (bug fix) Reduced size required for compiled bytecodes by using a
+more compact encoding for the command pc-to-source map. (BL)
+8/6/97 (new feature) Added support for additional compilation and execution
+statistics when Tcl is compiled with the TCL_COMPILE_STATS flag. (BL)
+8/7/97 (bug fix) Expressions not in {}s that have a comparison operator as
+the topmost operator must be compiled out-of-line (call the expr cmd at
+runtime) to properly support expr's two-level substitution semantics. An
+example is "set a 2; set b {$a}; puts [expr $b == 2]". (BL)
+8/11/97 (bug fix) The catch command would sometimes crash if a variable name
+was given and the bytecode evaluation stack was grown when executing the
+argument script. (BL)
+8/12/97 (feature change) Reinstated the variable tcl_precision to control
+the number of digits used when floating-point values are converted to
+strings, with default of 12 digits.  However, had to make tcl_precision
+shared among all interpreters (except that safe interpreters can't
+modify it).  This makes the Tcl 8.0 behavior almost identical to 7.6
+except that the default precision is 12 instead of 6. (JO)
+*** POTENTIAL INCOMPATIBILITY ***
+----------------- Released 8.0, 8/18/97 -----------------------
+8/19/97 (bug fix) Minimal fix for glob -nocomplain bugs:
+"glob -nocomplain unreadableDir/*" was generating an anonymous
+error. More in depth fixes will come with 8.1. (DL).
+8/20/97 (bug fix) Removed check for FLT_MIN in binary command so
+underflow conditions are handled by the compiler automatic
+conversions. (SS)
+8/20/97 (bug fixes) Fixed several compilation-related bugs:
+- Array cmd wasn't detecting arrays that, while compiled, do not yet
+exist (e.g., are marked undefined since they haven't been assigned
+to yet).
+- The GetToken procedure in tclCompExpr.c wasn't recognizing properly
+whether an integer token was invalid. For example, "0x$" is not
+a valid integer.
+- Performance bug in TclExecuteByteCode: the size of its stack frame
+was reduced by over 20% by moving errorInfo code elsewhere.
+- Uninitialized memory read error in tclCompile.c. (BL)
+8/21/97 (bug fix) safe::interpConfigure now behave like Tk widget's
+configure : it changes only the options you provide and you can get
+the current value of any single option. New ?-nested boolean? and
+?-statics boolean? for all safe::interp* commands but we still
+accept (upward compatibility) the previously defined non valued
+flags ?-noStatics? and ?-nestedLoadOk?. Improved the documentation. (DL).
+8/22/97 (bug fix) Updated PrintDbl.3 to reflect the fact that the
+tcl_precision variable is still used and that it is now shared by all
+interpreters. (BL)
+8/25/97 (bug fix) Fixed array access bug in IllegalExprOperandType
+procedure in tclExecute.c: it was not properly supporting the || and &&
+operators. (BL)
+8/27/97 (bug fix) In cases where a channel handler was created with an
+empty event mask while data was still buffered in the channel, the
+channel code would get stuck spinning on a timer that would starve
+idle handlers.  This mostly happened in Tk when reading from stdin. (SS)
+9/4/97 (bug fix) Slave interps now inherit the maximum recursion limit
+of their parent instead of starting back at the default. {nb: this still
+does not prevent stack overflow by multi-interps recursion or aliasing} (DL)
+9/11/97 (bug fix) An uninitialized variable in Tcl_WaitPid caused
+pipes to fail to report eof properly under Windows. (SS)
+9/12/97 (bug fix) "exec" was misidentifying some DOS executables as not
+executable. (CCS)
+9/14/97 (bug fix) Was using the wrong structure in sizeof operation in
+tclUnixChan.c. (JL)
+9/15/97 (bug fix) Fixed notifier to break out of do-one-event loop if
+Tcl_WaitForEvent returns 1, so that callers of Tcl_DoOneEvent will get
+a chance to check whether the event just handled is significant. This
+affected mainly recursive calls to Tcl_VWaitCmd; these did not get a
+chance to notice that the variable they were waiting for has been set
+and thus they didn't terminate the vwait. (JL, DL, SS)
+9/15/97 (bug fix) Alignment problems in "binary format" would cause a
+crash on some platforms when formatting floating point numbers. (SS)
+9/15/97 (bug fix) Fixed bug in Macintosh socket code.  Now passes all
+tests in socket.test that are not platform specific. (Thanks to Mark
+Roseman for the pointer on the fix.)  (RJ)
+9/18/97 (bug fix) Fixed bug -dictionary option of lsort that could
+cause the compare function to run off the end of an array if the
+number only contained 0's. (Thanks to Greg Couch for the report.) (RJ)
+9/18/97 (bug fix) TclFinalizeEnvironment was not cleaning up
+properly. (DL, JI)
+9/18/97 (bug fix) Fixed long-standing bug where an "array get" command
+did not trigger traces on the array or its elements. (BL)
+9/18/97 (bug fixes) Fixed compilation-related bugs:
+- Fixed errorInfo traceback information for toplevel coomands that
+contain nested commands.
+- In the expr command, && and || now accept boolean operands as well
+as numeric ones. (BL)
+9/22/97 (bug fix) Fixed bug that prevented translation modes from being
+set independently for input and output on sockets if input was "auto". (JL)
+9/24/97 (bug fix) Tcl_EvalFile(3) and thus source(n) now works fine on
+files containing NUL chars. (DL)
+9/26/97 (bug fix) Fixed use of uninitialized memory in the environ array
+that later could cause random core dumps. Applies to all platforms. (JL)
+9/26/97 (bug fix) Fixed use of uninitialized memory in socket address data
+structure under some circumstances. This could cause random core dumps.
+This applies only to Unix. (JL)
+9/26/97 (bug fix) Opening files on PC-NFS volumes would cause a hang
+until the system timed after the file was closed. (SS)
+10/6/97 (bug fix) The join(n) command, though objectified, was loosing
+NULs in the joinString and in list elements after the 2nd one.
+Now you can "join $list \0" for instance. (DL)
+10/9/97 (bug fix) Under windows, if env(TMP) or env(TEMP) referred to a
+non-existent directory, exec would fail when trying to create its temporary
+files. (CCS)
+10/9/97 (bug fix) Under mac and windows, "info hostname" would crash if
+sockets were installed but the hostname could not be determined anyhow.
+Tcl_GetHostName() was returning NULL when it should have been returning
+an empty string. (CCS)
+10/10/97 (bug fix) "file attribute /" returned error on windows. (CCS)
+10/10/97 (bug fix) Fixed the auto_load procedure to handle procedures
+defined in namespaces better.  Also fixed pgk_mkIndex so it sees procedures
+defined in nested namespaces.  Index entries are still only made for
+exported procedures. (BW)
+10/13/97 (bug fix) On unix, for files with unknown group or owner
+attributes, querying the "file attributes" would return an error rather than
+returning the group's or owner's id number, although tha command accepts
+numbers when setting the file's group or owner.  (CCS)
+10/22/97 (bug fix) "fcopy" did not eval the callback script at the
+global scope. (SS)
+10/22/97 (bug fix) Fixed the signature of the CopyDone callback used in
+the http package(s) so they can handle error cases properly. (BW)
+10/28/97 (bug fixes) Fixed a problem where lappend would free the Tcl object
+in a variable if a Tcl_ObjSetVar2 failed because of an error calling a trace
+on the variable. (BL)
+10/28/97 (bug fix) Changed binary scan to properly handle sign
+extension of integers on 64-bit or larger machines. (SS)
+11/3/97 (bug fixes) Fixed several bugs:
+- expressions such as "expr ($x)" must be compiled out-of-line
+(call the expr command procedure at runtime) to ensure the correct
+behavior when "$x" is an expression such as "5+10".
+- "array set a {}" now creates a new array var with an empty array
+value if the var didn't already exist.
+- "lreplace $foo end end" no longer returns an error (just an empty
+list) if foo is empty.
+- upvar will no longer create a variable in a namespace that refers
+to a variable in a procedure.
+- deleting a command trace within a command trace callback would
+make the code that calls traces to reference freed memory.
+- significantly sped up "string first" and "string last" (fix from
+darrel@gemstone.com).
+- seg fault in Tcl_NewStringObj() when a NULL is passed as the byte
+pointer argument and Tcl is compiled with -DTCL_MEM_DEBUG.
+- documentation and error msg fixes. (BL)
+11/3/97 (bug fix) Fixed a number of I/O bugs related to word sizes on
+64-bit machines. (SS)
+11/6/97 (bug fix) The exit code of the first process created by Tcl
+on Windows was not properly reported due to an initialization
+problem. (SS)
+----------------- Released 8.0p1, 11/7/97 -----------------------
+11/19/97 (bug fix) Fixed bug in linsert where it sometimes accidently
+cleared out a shared argument list object. (BL).
+11/19/97 (bug fix) Autoloading in namespaces was not working properly.
+auto_mkindex is still not really namespace aware but most common
+cases should now be handled properly (see init.test). (BW, DL)
+11/20/97 (enhancement) Made the changes required by the new Apple
+Universal Headers V.3.0, so that Tcl will compile with CW Pro 2.
+11/24/97 (bug fix) Fixed tests in clock test suite that needed the
+-gmt flag set.  Thanks to Jan Nijtmans for reporting the problem. (RJ)
+----------------- Released 8.0p2, 11/25/97 -----------------------
+12/3/97 (bug fix/optimization) Removed uneeded and potentially dangerous
+instances of double evaluations if "if" and "expr" statements from
+the library files. It is recommended that unless you need a double
+evaluation you always use "expr {...}" instead of "expr ..." and
+"if {...} ..." instead of "if ... ...". It will also be faster
+thanks to the byte compiler. (DL)
+---- Shipped as part of the plugin2.0b5 as 8.0p2Plugin1, Dec 8th 97 ----
+12/8/97 (bug fix) Need to protect the newly accepted channel in an
+accept callback on a socket, otherwise the callback may close it and
+cause an error, which would cause the C code to attempt to close the
+now deleted channel. Bumping the refcount assures that the channel sticks
+around to be really closed in this case. (JL)
+12/8/97 (bug fix) Need to protect the channel in a fileevent so that it
+is not deleted before the fileevent handler returns. (CS, JL)
+12/18/97 (bug fix) In the opt argument parsing package: if the description
+had only flags, the "too many arguments" case was not detected. The default
+value was not used for the special "args" ending argument. (DL)
+1/15/98 (improvement) Moved common part of initScript in common file.
+Moved windows specific initialization to init.tcl so you can initialize
+Tcl in windows without having to call Tcl_Init which is now only
+searching for init.tcl {back ported from 8.1}. (DL)
+---- Shipped as part of the plugin as 8.0p2Plugin2, Jan 15th 98 ----
+5/27/98 (bug fix) Windows socket driver did not notice new data arriving
+on nonblocking sockets until the event loop was entered. (SS)
+5/27/98 (bug fix) Windows socket driver used FIONREAD, which is not
+supported correctly by WinSock. (SS)
+6/9/98 (bug fix) Generic channel code failed to report readable file
+events on buffered data that was left behind by a gets or read that
+did not consume all available data. (SS)
+6/18/98 (bug fix) Compilation of loop expressions was too aggressive
+and incorrectly inlined non-literal expressions. (SS)
+6/18/98 (bug fix) "info var" and "info locals" incorrectly reported
+the existence of compiler temporary variables. (SS)
+6/18/98 (bug fix) Dictionary sorting used signed character
+comparisons. (SS)
+6/18/98 (bug fix) Compile procs corrupted the exception stack in some
+cases. (SS)
+6/18/98 (bug fix) Array set had erratic behavior when initializing a
+variable from an empty value list. (SS)
+6/18/98 (bug fix) The Windows registry package had a bad bounds check
+that could lead to a crash. (SS)
+6/18/98 (bug fix) The foreach compile proc did not correctly handle
+non-local variable references. (SS)
+6/25/98 (new features) Added name resolution hooks to support [incr Tcl].
+There are new internal Tcl_*Resolver* APIs to add, query and remove the hooks.
+With this changes it should be possible to dynamically load [incr Tcl]
+as an extension. (MM)
+7/1/97 (bug fix) The commands "info args, body, default, procs" did
+not correctly handle imported procedures. (RJ)
+7/6/98 (improvement) pkg_mkIndex now implements the "package require"
+command.  This makes it possible to create index files for packages
+that require another package and then execute code from that package in
+their file. Previously, this would throw an error because the required
+package had not been loaded.  The -nopkgrequied flag is provided to
+revert back to the old functionality. (EMS)
+7/6/98 (improvement) back-ported the -direct flag from 8.1 into
+pkg_mkIndex.  This results in pkgIndex.tcl files that contain direct
+source or load commands instead of tclPkgSetup commands. (EMS)
+7/6/98 (improvement) made changes to the AuxData items structures to support
+storage of compiled scripts on disk. Also some related minor changes in
+the compilation and execution engine. (EMS)
+6/4/98 (enhancement) Added new internal routines to support inserting
+and deleting from the stat, access, and open-file-channel mechanisms.
+TclAccessInsertProc, TclStatInsertProc, & TclOpenFileChannelInsertProc
+insert pointers to such routines; TclAccessDeleteProc, TclStatDeleteProc,
+& TclOpenFileChannelDeleteProc delete pointers to such routines.  See
+the file generic/tclIOUtils.c for more details. (SKS)
+7/1/98 (enhancement) Added a new internal C variable
+tclPreInitScript.  This is a pointer to a string that may hold an
+initialization script; If this pointer is non-NULL it is evaluated in
+Tcl_Init() prior to the built-in initialization script defined in the
+file generic/tclInitScript.h.  (SKS)
+7/6/98 (bug fix) Removed dead code in PlatformInitExitHandler so that
+the TCL_LIBRARY value can be safely patched in binaries. (BW)
+7/24/98 (enhancement) Incorporated a new version of auto_mkindex that
+can support the [incr Tcl] class structures.  This version will index
+all procedures in a source file, not just those where "proc" starts
+at the beginning of the line.  If you want the old behavior, use the
+auto_mkindex_old procedure. (MM)
+7/24/98 (feature change) Changed the Windows registry key to be
+HKEY_LOCAL_MACHINE\Software\Scriptics\Tcl\8.0, and to store the path
+in the default value instead of "Root".  Also, this key can be
+specified at compile time in case Tcl is being used in a different
+context where it needs an alternate library path from the standard Tcl
+installation. (SS)
+7/24/98 (feature change) Changed the search order for init.tcl.  The
+tcl_library variable can now be set before calling Tcl_Init to avoid
+doing any searches.  If it isn't set, then Tcl checks
+env(TCL_LIBRARY), the static value set at compile time, an install
+directory relative to the executable, a source directory relative to
+the executable, and a tcl directory relative to the source heirarchy
+containing the executable.  See the comment at the top of
+generic/tclInitScript.h for more details. (SS)
+7/27/98 (config change) Changed the use of the DBGX flag in configure.in
+and the makefile to be TCL_DBGX.  Users of tclConfig.sh may need to pass
+this through their configure files with AC_SUBST. (BW)
+729/98 (bug fix) Changed [info body] to return a copy of the body of a
+compiled procedure instead of the body itself, to avoid invalidation
+of the internal rep and loss of the byte-codes. (EMS)
+8/5/98 (bug fix) The platform init code could walk off the end of a
+buffer when reading the PkgPath registry value on Windows. (SS)
+8/5/98 (Windows makefile change) Introduced a set of macros to deal with
+exporting symbols when compiling DLLS on Windows. See win/README for
+details. (EMS)
+8/5/98 (addendum) Added a second Windows registry key under
+HKEY_LOCAL_MACHINE\Software\Scriptics\Tcl\8.0, named "pkgPath".
+This is a multi-string value used to initialize the tcl_pkgPath
+variable. This is required if extension DLLs are in architecture specific
+subdirectories. (SS)
+8/6/98 (new feature) Added tcl_findLibrary to init.tcl for use by
+extensions, including Tk.  This searches in a canonical way for
+an extensions library directory and initialization file. (BW)
+8/10/98 (bug fix) Imported commands used to get lost if the target
+of the import was redefined.  Tcl_CreateCommand and Tcl_CreateObjCommand
+were updated to restore import links. (Note that if you rename a command,
+the import links move to the new name, and if you delete a command then
+the import links get lost. These semantics have not changed.) (MC)
+-------- Released 8.0.3 to the Tcl Consortium CD-ROM project, 8/10/98 ------
+9/3/98 (bug fix) Tcl_Realloc was failing under Windows because the
+GlobalReAlloc API was not correctly re-allocating blocks that were
+32k+.  The fix was to use newer Win32 APIs (HeapAlloc, HeapFree, and
+HeapReAlloc.) (BS)
+10/5/98 (bug fix) Fixed bug in pkg_mkIndex that caused some files that do
+a "package require" of packages in the Tcl libraries to give a warning like
+	warning: "xx.tcl" provides more than one package ({xx 2.0} {yy 0.3})
+and generate a broken pkgIndex.tcl file. (EMS)
+10/5/98 (bug fix) Pkg_mkIndex was not doing a case-insensitive comparison
+of extensions to determine whether to load or source a file. Thus, under
+Windows, MYDLLNAME.DLL was sourced, and mydllname.dll loaded. (EMS)
+10/5/98 (new feature) Created a new Tcl_Obj type, "procbody". This object's
+internal representation holds a pointer to a Proc structure. Extended
+TclCreateProc to take both strings and "procbody". (EMS)
+10/13/98 (bug fix) The "info complete" command can now handle strings
+with NULLs embedded.  Thanks to colin@field.medicine.adelaide.edu.au
+for providing this fix. (RJ)
+10/13/98 (bug fix) The "lsort -dictionary" command did not properly
+handle some numbers starting with 0.  Thanks to Richard Hipp
+<drh@acm.org> for submitting the fix to Scriptics. (RJ)
+10/13/98 (bug fix) The function Tcl_SetListObj was creating an invalid
+Tcl_Obj if the list had zero elements (despite what the comments said
+it would do).  Thanks to Sebastian Wangnick for reporting the
+problem. (RJ)
+10/20/98 (new feature) Added tcl_platform(debug) element to the
+tcl_platform array on Windows platform.  The existence of the debug
+element of the tcl_platform array indicates that the particular Tcl
+shell has been compiled with debug information.  Using
+"info exists tcl_platform(debug)" a Tcl script can direct the
+interpreter to load debug versions of DLLs with the load
+command. (SKS)
+10/20/98 (feature change) The Makefile and configure scripts have been
+changed for IRIX to build n32 binaries instead of the old 32 abi
+format.  If you have extensions built with the o32 abi's you will need
+to update them to n32 for them to work with Tcl.  (RJ)
+*** POTENTIAL INCOMPATIBILITY ***
+10/23/98 (bug fix) tcl_findLibrary had a stray ] in one of the
+pathnames it searched for the initialization script.  tclInitScript.h
+was incorrectly adding the parent of tcl_library to tcl_pkgPath.  This
+logic was moved into init.tcl, and the initialization of auto_path was
+documented.  Thanks to Donald Porter and Tom Silva for related
+patches. (BW)
+10/29/98 (bug fix) Fixed Tcl_NotifyChannel to use Tcl_Preserve instead
+of Tcl_RegisterChannel so that 1) unregistered channels do not get
+closed after their first fileevent, and 2) errors that occur during
+close in a fileevent script are actually reflected by the close
+command. (BW)
+10/30/98 (bug fix) Overhaul of pkg_mkIndex to deal with transitive
+package requires and packages split among scripts and binary files.
+Also fixed ommision of global for errorInfo in tcl_findLibrary. (BW)
+11/08/98 (bug fix) Fixed the resource command to always detect
+the case where a file is opened a second time with the same
+permissions.  IM claims that this will always cause the same
+FileRef to be returned, but in MacOS 8.1+, this is no longer the case,
+so we have to test for this explicitly. (JI)
+11/10/98 (feature change) When compiling with Metrowerk's MSL, use the
+exit function from MSL rather than ExitToShell.  This allows MSL to
+clean up its temporary files. Thanks to Vince Darley for this
+improvement. (JI)
+----------------- Released 8.0.4, 11/19/98 -------------------------
+11/20/98 (bug fix) Handle possible NULL return in TclGetStdFiles. (RJ)
+11/20/98 (bug fix) The dltests would not build on SGI.  They reported
+that you could not mix n32 with 032 binaries.  The configure script
+has been modified to get the EXTRA_CFLAGS from the tcl configure
+script.  [Bug id: 840] (RJ)
+12/3/98 (bug fix) Windows NT creates sockets so they are inheritable
+by default.  Fixed socket code so it turns off this bit right after
+creation so sockets aren't kept open by exec'ed processes. [Bug: 892]
+Thanks to Kevin Kenny for this fix.  (SS)
+1/11/98 (bug fix)  On HP, "info sharedlibextension" was returning
+empty string on static apps.  It now always returns ".sl".  (RJ)
+1/28/99 (configure change) Now support -pipe option on gcc.  (RJ)
+2/2/99 (bug fix) Fixed initialization problem on Windows where no
+searching for init.tcl would be performed if the registry keys were
+missing.  (stanton)
+2/2/99 (bug fix) Added support for HKEY_PERFORMANCE_DATA and
+HKEY_DYN_DATA keys in the "registry" command. (stanton)
+2/2/99 (bug fix) ENOTSUP and EOPNOTSUPP clashed on some Linux
+variants. (stanton)
+2/2/99 (enhancement) The "open" command has been changed to use the
+object interfaces. (stanton)
+2/2/99 (bug fix) In some cases Tcl would crash due to an overflow of
+the exception stack resulting from a missing byte code in some
+expressions. (stanton)
+2/2/99 (bug fix) Changed configure so Linux and IRIX shared libraries
+are linked with the system libraries. (stanton)
+2/2/99 (bug fix) Added support for BSDI 4.x (BSD/OS-4*) to the
+configure script. (stanton)
+2/2/99 (bug fix) Fixed bug where upvar could resurrect a namespace
+variable after the namespace had been deleted. (stanton)
+2/2/99 (bug fix) In some cases when creating variables, the
+interpreter result was being modified even if the TCL_LEAVE_ERR_MSG
+flag was set. (stanton)
+2/2/99 (bug fix & new feature) Changed the socket drivers to properly
+handle failures during an async socket connection.  Added a new
+fconfigure option "-error" to retrieve the failure message.  See the
+socket.n manual entry for details. (stanton)
+2/2/99 (bug fix) Deleting a renamed interp alias could result in a
+panic. (stanton)
+2/2/99 (feature change/bug fix) Changed the behavior of "file
+extension" so that it splits at the last period.  Now the extension of
+a file like "foo..o" is ".o" instead of "..o" as in previous versions.
+*** POTENTIAL INCOMPATIBILITY ***
+----------------- Released 8.0.5, 3/9/99 -------------------------
+======== Changes for 8.0 go above this line ========
+======== Changes for 8.1 go below this line ========
+6/18/97 (new feature) Tcl now supports international character sets:
+- All C APIs now accept UTF-8 strings instead of iso8859-1 strings,
+wherever you see "char *", unless explicitly noted otherwise.
+- All Tcl strings represented in UTF-8, which is a convenient
+multi-byte encoding of Unicode.  Variable names, procedure names,
+and all other values in Tcl may include arbitrary Unicode characters.
+For example, the Tcl command "string length" returns how many
+Unicode characters are in the argument string.
+- For Java compatibility, embedded null bytes in C strings are
+represented as \xC080 in UTF-8 strings, but the null byte at the end
+of a UTF-8 string remains \0.  Thus Tcl strings once again do not
+contain null bytes, except for termination bytes.
+- For Java compatibility, "\uXXXX" is used in Tcl to enter a Unicode
+character.  "\u0000" through "\uffff" are acceptable Unicode
+characters.
+- "\xXX" is used to enter a small Unicode character (between 0 and 255)
+in Tcl.
+- Tcl automatically translates between UTF-8 and the normal encoding for
+the platform during interactions with the system.
+- The fconfigure command now supports a -encoding option for specifying
+the encoding of an open file or socket.  Tcl will automatically
+translate between the specified encoding and UTF-8 during I/O.
+See the directory library/encoding to find out what encodings are
+supported (eventually there will be an "encoding" command that
+makes this information more accessible).
+- There are several new C APIs that support UTF-8 and various encodings.
+See Utf.3 for procedures that translate between Unicode and UTF-8
+and manipulate UTF-8 strings. See Encoding.3 for procedures that
+create new encodings and translate between encodings.  See
+ToUpper.3 for procedures that perform case conversions on UTF-8
+strings.
+9/18/97 (enhancement) Literal objects are now shared by the ByteCode
+structures created when compiled different scripts. This saves up to 45%
+of the total memory needed for all literals. (BL)
+9/24/97 (bug fixes) Fixed Tcl_ParseCommand parsing of backslash-newline
+sequences at start of command words. Suppressed Tcl_EvalDirect error logging
+if non-TCL_OK result wasn't an error. (BL)
+10/17/97 (feature enhancement) "~username" now refers to the users' home
+directory on Windows (previously always returned failure). (CCS)
+10/20/97 (implementation change) The Tcl parser has been completely rewritten
+to make it more modular.  It can now be used to parse a script without actually
+executing it.  The APIs for the new parser are not correctly exported, but
+they will eventually be exported and augmented with Tcl commands so that
+Tcl scripts can parse other Tcl scripts. (JO)
+10/21/97 (API change) Added "flags" argument to Tcl_EvalObj, removed
+Tcl_GlobalEvalObj procedure.  Added new procedures Tcl_Eval2 and
+Tcl_EvalObjv. (JO)
+*** POTENTIAL INCOMPATIBILITY ***
+10/22/97 (API change) Renamed Tcl_ObjSetVar2 and Tcl_ObjGetVar2 to
+Tcl_SetObjVar2 and Tcl_GetObjVar2 (for consistency with other C APIs)
+and changed the name arguments to be strings instead of objects.  (JO)
+*** POTENTIAL INCOMPATIBILITY ***
+10/27/97 (enhancement) Bytecode compiler rewritten to use the new Tcl
+parser. (BL)
+11/3/97 (New routines) Added Tcl_AppendObjToObj, which appends the
+string rep of one Tcl_Obj to another. Added Tcl_GetIndexFromObjStruct,
+which is similar to Tcl_GetIndexFromObj, except that you can give an
+offset between strings. This allows Tcl_GetIndexFromObjStruct to be
+called with a table of records which have strings in them. (SRP)
+12/4/97 (enhancement) New Tcl expression parser added. Added new procedure
+Tcl_ParseExpr and new token types TCL_TOKEN_SUB_EXPR and
+TCL_TOKEN_OPERATOR. Expression compiler is reimplemented to use this
+parser. (BL)
+12/9/97 (bug fix) Tcl_EvalObj() increments/decrements the refcount of the
+script object to prevent the object from deleting itself while in the
+middle of being evaluated. (CCS)
+12/9/97 (bug fix) Memory leak in Tcl_GetsObjCmd(). (CCS)
+12/11/97 (bug fix) Environment array leaked memory when compiled with
+Visual C++. (SS)
+12/11/97 (bug fix) File events and non-blocking I/O did not work on
+pipes under Windows.  Changed to use threads to achieve non-blocking
+behavior. (SS)
+12/18/97 (bug fixes) Fixed segfault in "namespace import"; importing a
+procedure that causes a cycle now returns an error. Modified "info procs",
+"info args", "info body", and "info default" to return information about
+imported procedures as well as procedures defined in a namespace. (BL)
+12/19/97 (enhancement) Added new Tcl_GetString() procedure that can be used
+in place of Tcl_GetStringFromObj() if the string representation's length
+isn't needed. (BL)
+12/18/97 (bug fix) In the opt argument parsing package: if the description
+had only flags, the "too many arguments" case was not detected. The default
+value was not used for the special "args" ending argument. (DL)
+1/7/98 (clean up) Moved everything not absolutly necessary out of init.tcl
+procs now in auto.tcl and package.tcl can be autoloaded if needed. (DL)
+1/7/98 (enhancement) tcltest made at install time will search for it's
+init.tcl where it is, even when using virtual path compilation. (DL)
+1/8/98 (os bug workaround) when needed, using a replacement for memcmp so
+string compare "char with high bit set" "char w/o high bit set" returns
+the expected value on all platforms. (DL)
+1/8/98 (unix portability/configure) building from .../unix/targetName/
+subdirectories and simply using "../configure" should now work fine. (DL)
+1/14/98 (enhancement) Added new regular expression package that
+supports AREs, EREs, and BREs.  The new package includes new escape
+characters, meta-syntax, and character classes inside brackets.
+Regexps involving backslashes may behave differently.  (MH)
+*** POTENTIAL INCOMPATIBILITY ***
+1/16/98 (os workaround) Under windows, "file volume" was causing chatter
+and/or several seconds of hanging when querying empty floppy drives.
+Changed implementation to call an empirically-derived function that doesn't
+cause this. (CCS)
+1/16/98 (enhancement) Converted regular expressions to a Tcl_Obj type so
+their compiled form gets cached automatically.  Reduced NSUBEXP from 100
+to 20. (BW)
+1/16/98 (documentation) Change unclear documentation and comments for
+functions like Tcl_TranslateFileName() and Tcl_ExternalToUtfDString().  Now
+it explicitly says they take an uninitialized or free DString.  A DString
+that is "empty" or "not holding anything" could have been interpreted as one
+currently with a zero length, but with a large dynamically allocated buffer.
+(CCS)
+----------------- Released 8.1a1, 1/22/98 -----------------------
+1/28/98 (new feature) Added a "-direct" optional flag to pkg_mkIndex
+to generate direct loading package indexes (such those you need
+if you use namespaces and plan on using namespace import just after
+package require). pkg_mkIndex still has limitations regarding
+package dependencies but errors are now ignored and with -direct, correct
+package indexes can be generated even if there are dependencies as long
+as the "package provide" are done early enough in the files. (DL)
+1/28/98 (enhancement) Performance tuning of regexp and regsub. (CCS)
+1/28/98 (bug fix) regexp and regsub with "-indices" returned the byte-offsets
+of the characters in the UTF-8 representation, not the character offsets
+themselves. (CCS)
+1/28/98 (bug fix) "clock format 0 -format %Z -gmt 1" would return the local
+timezone string instead of "GMT" on Solaris and Windows.
+1/28/98 (bug fix) Restore tty settings when closing serial device on Unix.
+This is good behavior when closing real serial devices, essential when
+closing the pseudo-device /dev/tty because the user's terminal settings
+would be left useless, in raw mode, when tcl quit. (CCS)
+1/28/98 (bug fix) Tcl_OpenCommandChannel() was modifying the contents of the
+argv array passed to it, causing problems for any caller that wanted to
+continue to use the argv array after calling Tcl_OpenCommandChannel(). (CCS)
+2/1/98 (bug fix) More bugs with %Z in format string argument to strftime():
+1. Borland always returned empty string.
+2. MSVC always returned the timezone string for the current time, not the
+timezone string for the specified time.
+3. With MSVC, "clock format 0 -format %Z -gmt 1" would return "GMT" the first
+time it was called, but would return the current timezone string on all
+subsequent calls. (CCS)
+2/1/98 (bug fix) "file stat" was broken on Windows.
+1. "file stat" of a root directory (local or network) or a relative path that
+resolved to a root directory (c:. when in pwd was c:/) was returning error.
+2. "file stat" on a regular file (S_IFREG), the st_mode was sign extended to
+a negative int if the platform-dependant type "mode_t" was declared as a
+short instead of an unsigned short.
+3. "file stat" of a network directory, the st_dev was incorrectly reported
+as the id of the last accessed local drive rather than the id of the
+network drive. (CCS)
+2/1/98 (bug fix) "file attributes" of a relative path that resolved to a
+root directory was returning error. (CCS)
+2/1/98 (bug fix) Change error message when "file attribute" could not
+determine the attributes for a file.  Previously it would return different
+error messages on Unix vs.  Windows vs. Mac. (CCS)
+2/4/98 (bug fixes) Fixed several instances of bugs where the parser/compiler
+would reach outside the range of allocated memory. Improved the array
+lookup algorithm in set compilation. (DL)
+2/5/98 (change) The TCL_PARSE_PART1 flag for Set/Get(Obj)Var2 C APIs is now
+deprecated and ignored. The part1 is always parsed when the part2 argument
+is NULL. This is to avoid a pattern of errors for extension writers converting
+from string based Tcl_SetVar() to new Tcl_SetObjVar2() and who could easily
+forget to provide the flag and thus get code working for normal variables
+but not for array elements. The performance hit is minimal. A side effect
+of that change is that is is no longer possible to create scalar variables
+that can't be accessed by tcl scripts because of their invalid name
+(ending with parenthesis). Likewise it is also parsed and checked to
+ensure that you don't create array elements of array whose name is a valid
+array element because they would not be accessible from scripts anyway.
+Note: There is still duplicate array elements parsing code. (DL)
+*** POTENTIAL INCOMPATIBILITY ***
+2/11/98 (bug fix) Sharing objects between interps, such as by "interp
+eval" or "send" could cause a crash later when dereferencing an interp
+that had been deleted, given code such as:
+	set a {set x y}
+	interp create foo
+	interp eval foo $a
+	interp delete foo
+	unset a
+Interp "foo" was gone, but "a" had a internal rep consisting of bytecodes
+containing a dangling pointer to "foo".  Unsetting "a" would attempt to
+return resources back to "foo", causing a crash as random memory was
+accessed.  The lesson is that that if an object's internal rep depends on
+an interp (or any other data structure) it must preserve that data in
+some fashion. (CCS)
+2/11/98 (enhancement) The "interp" command was returning inconsistent error
+messages when the specified slave interp could not be found. (CCS)
+2/11/98 (bug fix) Result codes like TCL_BREAK and TCL_CONTINUE were not
+propagating through the master/slave interp boundaries, such as "interp
+eval" and "interp alias".  TCL_OK, TCL_ERROR, and non-standard codes like
+teh integer 57 work.  There is still a question as to whether TCL_RETURN
+can/should propagate. (CCS)
+2/11/98 (bug fix) TclCompileScript() was derefering memory 1 byte before
+start of the string to compile, looking for ']'. (CCS,DL)
+2/11/98 (bug fix) Tcl_Eval2() was derefering memory 1 byte before start
+of the string to eval, looking for ']'. (CCS,DL)
+2/11/98 (bug fix) Compiling "set a(b" was running off end of string. (CCS,DL)
+2/11/98 (bug fix) Windows initialization code was dereferencing
+uninitialized memory if TCL_LIBRARY environment didn't exist. (CCS)
+2/11/98 (bug fix) Windows "registry" command was dereferencing
+uninitialized memory when constructing the $errorCode for a failed
+registry call. (CCS)
+2/11/98 (enhancement) Eliminate the TCL_USE_TIMEZONE_VAR definition from
+configure.in, because it was the same information as the already existing
+HAVE_TM_ZONE definition.  The lack of HAVE_TM_ZONE is used to work around a
+Solaris and Windows bug where "clock format [clock sec] -format %Z -gmt 1"
+produces the local timezone string instead of "GMT". (CCS)
+2/11/98 (bug fix) Memleaks and dereferencing of uninitialized memory in
+regexp if an error occurred while compiling a regular expression. (CCS).
+2/18/98 (new feature) Added mutexes and thread local storage in order
+to make Tcl thread safe.  For testing purposes, there is a testthread
+command that creates a new thread and an interpreter inside it.  See
+thread.test for examples, but this script-level interface is not fixed.
+Each thread has its own notifier instance to manage its own events,
+and threads can post messages to each other's message queue.
+This uses pthreads on UNIX, and native thread support on other platforms.
+You enable this by configuring with --enable-threads.  Note that at
+this time *Tk* is still not thread safe. Special thanks to
+Richard Hipp: his earlier implementation inspired this work. (BW, SS, JI)
+2/18/98 (hidden feature change) The way the env() array is shared among
+interpreters changed.  Updates to env used to trigger write traces in
+other interpreters.  This undocumented feature is no longer implemented.
+Instead, variable tracing is used to keep the C-level environ array in sync
+with the Tcl-level env array. This required adding TCL_TRACE_ARRAY support
+to Tcl_TraceVar2 so that array names works properly. (BW)
+*** POTENTIAL INCOMPATIBILITY ***
+2/18/98 (enhancement) Conditional compilation for unix systems (e.g.,
+IRIX, SCO) that use f_bsize instead of st_blksize to determine disk block
+size. (CCS)
+2/23/98 (bug fix) Fixed the emulation of polling selects in the threaded
+version of the Unix notifier.  The bug was showing up on a multiprocessor
+as starvation of the notifier thread. (BW)
+----------------- Released 8.1a2, Feb 23 1998 -----------------------
+9/22/98 (bug fix) Changed the value of TCL_TRACE_ARRAY so it no longer
+conflicts with the deprecated TCL_PARSE_PART1 flag.  This should
+improve portability of C code. (stanton)
+10/6/98 (bug fix) The compile procedure for "if" incorrectly attempted
+to match against the literal string "if", resulting in a stack
+overflow when "::if" was compiled.  It also would incorrectly accept
+"if" instead of "elsif" in later clauses.  (stanton)
+10/15/98 (new feature) Added a "totitle" subcommand to the "string"
+command to convert strings to capitalize the first character of a string
+and lowercase all of the other characters. (stanton)
+10/15/98 (bug fix) Changed regexp and string commands to properly
+handle case folding according to the Unicode character
+tables. (stanton)
+10/21/98 (new feature) Added an "encoding" command to facilitate
+translations of strings between different character encodings.  See
+the encoding.n manual entry for more details. (stanton)
+11/3/98 (bug fix) The regular expression character classification
+syntax now includes Unicode characters in the supported
+classes. (stanton)
+11/6/98 (bug fix) Variable traces were causing crashes when upvar
+variables went out of scope. [Bug: 796] (stanton)
+11/9/98 (bug fix) "format" now correctly handles multibyte characters
+in %s format strings. (stanton)
+11/10/98 (new feature) "regexp" now accepts three new switches
+("-line", "-lineanchor", and "-linestop") that control how regular
+expressions treat line breaks. See the regexp manual entry for more
+details. (stanton)
+11/17/98 (bug fix) "scan" now correctly handles Unicode
+characters. (stanton)
+11/17/98 (new feature) "scan" now supports XPG3 position specifiers
+and the "%n" conversion character.  See the "scan" manual entry for
+more details. (stanton)
+11/17/98 (bug fix) The Tcl memory allocator now returns 8-byte aligned
+chunks of memory which improves performance on Windows and avoids
+crashes on other platforms. [Bug: 834] (stanton)
+11/23/98 (bug fix) Applied various regular expression performance bug
+fixes supplied by Henry Spencer. (stanton)
+11/30/98 (bug fix) Fixed various thread related race conditions. [Bug:
+880 & 607] (stanton)
+11/30/98 (bug fix) Fixed a number of memory overflow and leak
+bugs. [Bug: 584] (stanton)
+12/1/98 (new feaure) Added support for Korean encodings. (stanton)
+12/1/98 (feature change) Changed the Tcl_EvalObjv interface to remove
+the string and length arguments.
+*** POTENTIAL INCOMPATIBILITY with previous alpha releases ***
+12/2/98 (bug fix) Fixed various bugs related to line feed
+translation. [Bug: 887] (stanton)
+12/4/98 (new feature) Added a message catalog facility to help with
+localizing Tcl scripts.  Thanks to Mark Harrison for contributing the
+initial implementation of the "msgcat" package. (stanton)
+12/7/98 (bug fix) The memory allocator was failing to update the
+block list for large memory blocks that were reallocated into a
+different address. [Bug: 933] (stanton)
+----------------- Released 8.1b1, Dec 10 1998 -----------------------
+12/22/98 (performance improvement) Improved the -command option of the
+lsort command to better use the object system for improved
+performance (about 5x speed up).  Thanks to Syd Polk for suppling the
+patch. [RFE: 726] (rjohnson)
+2/10/99 (bug fix) Restored the Tcl_ObjSetVar2/Tcl_ObjGetVar2
+interfaces from 8.0 and renamed the Tcl_GetObjVar2/Tcl_SetObjVar2
+interfaces to Tcl_GetVar2Ex and Tcl_SetVar2Ex.  This should provide
+better compatibility with 8.0. (stanton)
+*** POTENTIAL INCOMPATIBILITY with previous alpha/beta releases ***
+2/10/99 (bug fix) Made the eval interfaces compatible with 8.0 by
+renaming Tcl_EvalObj to Tcl_EvalObjEx, renaming Tcl_Eval2 to
+Tcl_EvalEx and restoring Tcl_EvalObj and Tcl_GlobalEvalObj interfaces
+so they match Tcl 8.0. (stanton)
+*** POTENTIAL INCOMPATIBILITY with previous alpha/beta releases ***
+2/25/99 (bug fix/new feature) On Windows, the channel drivers for
+consoles and serial ports now completely support file events. (redman)
+3/5/99 (bug fix) Integrated patches to fix various configure problems
+that affected HP-UX-11, 64-bit IRIX, Linux, and Solaris. (stanton)
+3/9/99 (bug fix) Integrated various AIX related patches to improve
+support for shared libraries. (stanton)
+3/9/99 (new feature) Added tcl_platform(user) to provide a portable
+way to get the name of the current user. (welch)
+3/9/99 (new feature) Integrated the stub library mechanism contributed
+by Jan Nijtmans, Paul Duffin, and Jean-Claude Wippler.  This feature
+should make it possible to write extensions that support multiple
+versions of Tcl simultaneously.  It also makes it possible to
+dynamically load extensions into statically linked interpreters.  This
+patch includes the following changes:
+-	Added a Tcl_InitStubs() interface
+-	Added Tcl_PkgProvideEx, Tcl_PkgRequireEx, Tcl_PkgPresentEx,
+	and Tcl_PkgPresent.
+- Added va_list versions of all VARARGS functions so they can be
+	invoked from wrapper functions.
+See the manual for more information. (stanton)
+3/10/99 (feature change) Replaced Tcl_AlertNotifier with
+Tcl_ThreadAlert since the Tcl_AlertNotifier function relied on passing
+internal data structures. (stanton)
+*** POTENTIAL INCOMPATIBILITY with previous alpha/beta releases ***
+3/10/99 (new feature) Added a Tcl_GetVersion API to make it easier to
+check the Tcl version and patch level from C. (redman)
+3/14/99 (feature change) Tried to unify the TclpInitLibrary path
+routines to look in similar places from Windows to UNIX.  The new
+library search path is: TCL_LIBRARY, TCL_LIBRARY/../tcl8.1, relative
+to DLL (Windows Only) relative to installed executable, relative to
+develop executable, and relative to compiled-in in location (UNIX
+Only.)  This fix included:
+- Defining a TclpFindExecutable
+- Moving Tcl_FindExecutable to a common area in tclEncoding.c
+- Modifying the TclpInitLibraryPath routines.
+(surles)
+3/14/99 (feature change) Added hooks for TclPro Wrapper to initialize
+the location of the encoding files and libraries.  This fix included:
+- Adding the TclSetPerInitScript routine.
+- Modifying the Tcl_Init routines to evaluate the non-NULL
+pre-init script.
+- Adding the Tcl_SetdefaultEncodingDir and Tcl_GetDefaultEncodingDir
+routines.
+- Modifying the TclpInitLibrary routines to append the default
+encoding dir.
+(surles)
+3/14/99 (feature change) Test suite now uses "test" namespace to
+define the test procedure and other auxiliary procedures as well as
+global variables.
+- Global array testConfige is now called ::test::testConfig.
+- Global variable VERBOSE is now called ::test::verbose, and
+::test::verbose no longer works with numerical values.  We've
+switched to a bitwise character string.  You can set
+::test::verbose by using the -verbose option on the Tcl command
+line.
+- Global variable TESTS is now called ::test::matchingTests, and
+can be set on the Tcl command line via the -match option.
+- There is now a ::test::skipTests variable (works similarly to
+::test::matchTests) that can be set on the Tcl command line via
+the -match option.
+- The test suite can now be run in any working directory.  When
+you run "make test", the working directory is nolonger switched
+to ../tests.
+(hirschl)
+*** POTENTIAL INCOMPATIBILITY ***
+--------------- Released 8.1b2, March 16, 1999 ----------------------
+3/18/99 (bug fix) Fixed missing/incorrect characters in shift-jis table
+(stanton)
+3/18/99 (feature change) The glob command ignores the
+FS_CASE_IS_PRESERVED bit on file systesm and always returns
+exactly what it gets from the system. (stanton)
+*** POTENTIAL INCOMPATIBILITY ***
+3/19/99 (new feature) Added support for --enable-64bit.  For now,
+this is only supported on Solaris 7 64bit (SunOS 5.7) using the Sun
+compiler. (redman)
+3/23/99 (bug fix) Fixed fileevents and gets on Windows consoles and
+serial devices so that non-blocking channels do not block on partial
+input lines.  (redman)
+3/23/99 (bug fix) Added a new Tcl_ServiceModeHook interface.
+This is used on Windows to avoid the various problems that people
+have been seeing where the system hangs when tclsh is running
+outside of the event loop. As part of this, renamed
+TcapAlertNotifier back to Tcl_AlertNotifier since it is public.
+(stanton)
+3/23/99 (feature change) Test suite now uses "tcltest" namespace to
+define the test procedure and other auxiliary procedures as well as
+global variables.  The previously chosen "test" namespace was thought
+to be too generic and likely to create conflits.
+(hirschl)
+*** POTENTIAL INCOMPATIBILITY ***
+3/24/99 (bug fix) Make sockets thread safe on Windows.
+(redman)
+3/24/99 (bug fix) Fix cases where expr would incorrect return
+a floating point value instead of an integer. (stanton)
+3/25/99 (bug fix) Added ASCII to big5 and gb2312 encodings.
+(stanton)
+3/25/99 (feature change) Changed so aliases are invoked at current
+scope in the target interpreter instead of at the global scope.  This
+was an incompatibility introduced in 8.1 that is being removed.
+(stanton)
+*** POTENTIAL INCOMPATIBILITY with previous beta releases ***
+3/26/99 (feature change) --enable-shared is now the default and build
+Tcl as a shared library; specify --disable-shared to build a static Tcl
+library and shell.
+*** POTENTIAL INCOMPATIBILITY ***
+3/29/99 (bug fix)  Removed the stub functions and changed the stub
+macros to just use the name without params. Pass &tclStubs into the
+interp (don't use tclStubsPtr because of collisions with the stubs on
+Solaris). (redman)
+3/30/99 (bug fix) Loadable modules are now unloaded at the last
+possible moment during Tcl_Finalize to fix various exit-time crashes.
+(welch)
+3/30/99 (bug fix) Tcl no longer calls setlocale().  It looks at
+env(LANG) and env(LC_TYPE) instead.  (stanton)
+4/1/99 (bug fix) Fixed the Ultrix multiple symbol definition problem.
+Now, even Tcl includes a copy of the Tcl stub library. (redman)
+4/1/99 (bug fix) Internationalized the registry package.
+4/1/99 (bug fix) Changed the implemenation of Tcl_ConditionWait and
+Tcl_ConditionNotify on Windows.  The new algorithm eliminates a race
+condition and was suggested by Jim Davidson. (welch)
+4/2/99 (new apis)  Made various Unicode utility functions public.
+Tcl_UtfToUniCharDString, Tcl_UniCharToUtfDString, Tcl_UniCharLen,
+Tcl_UniCharNcmp, Tcl_UniCharIsAlnum, Tcl_UniCharIsAlpha,
+Tcl_UniCharIsDigit, Tcl_UniCharIsLower, Tcl_UniCharIsSpace,
+Tcl_UniCharIsUpper, Tcl_UniCharIsWordChar, Tcl_WinUtfToTChar,
+Tcl_WinTCharToUtf (stanton)
+4/2/99 (feature change) Add new DDE package and removed the Tk
+send command from the Windows version.  Changed DDE-based send
+code into "dde eval" command.  The DDE package can be loaded
+into tclsh, not just wish.  Windows only. (redman)
+4/5/99 (bug fix) Changed safe-tcl so that the encoding command
+is an alias that masks out the "encoding system" subcommand.
+(redman)
+4/5/99 (bug fix) Configure patches to improve support for
+OS/390 and BSD/OS 4.*. (stanton)
+4/5/99 (bug fix) Fixed crash in the clock command that occurred
+with negative time values in timezones east of GMT. (stanton)
+4/6/99 (bug fix) Moved the "array set" C level code into a common
+routine (TclArraySet).  The TclSetupEnv routine now uses this API to
+create an env array w/ no elements.  This fixes the bug caused when
+every environ varaible is removed, and the Tcl env variable is
+synched.  If no environ vars existed, the Tcl env var would never be
+created. (surles)
+4/6/99 (bug fix) Made the Env module I18N compliant. (surles)
+4/6/99 (bug fix) Changed the FindVariable routine to TclpFindVariable,
+that now does a case insensitive string comparison on Windows, and not
+on UNIX. (surles)
+--------------- Released 8.1b3, April 6, 1999 ----------------------
+4/9/99 (bug fix)  Fixed notifier deadlock situation when the pipe used
+to talk back notifier thread is filled with data.  Found as a result of the
+focus.test for Tk hanging. (redman)
+4/13/99 (bug fix) Fixed bug where socket -async combined with
+fileevent for writing did not work under Windows NT. (redman)
+4/13/99 (encoding fix) Restored the double byte definition of GB2312
+and added the EUC-CN encoding.  EUC-CN is a variant of GB2312 that
+shifts the characters into bytes with the high bit set and includes
+ASCII as a subset. (stanton)
+4/27/99 (bug fix) Added 'extern "C" {}' block around the stub table
+pointer declaration so the stub library can be used from C++. (stanton)
+--------------- Released 8.1 final, April 29, 1999 ----------------------
+4/22/99 (bug fix) Changed Windows NT socket implementation to avoid
+creating a communication window.  This avoids the problem where the
+system hangs waiting for tclsh to respond to a system-wide synchronous
+broadcast (e.g. if you change system colors). (redman)
+4/22/99 (bug fix) Added call to TclWinInit from TclpInitPlatform when
+building a static library since DllMain will not be invoked.  This
+could break old code that explicitly called TclWinInit, but should be
+simpler in the long run. (stanton)
+*** POTENTIAL INCOMPATIBILITY ***
+4/23/99 (bug fix) Added support for the koi8-r Cyrillic
+encoding. [Bug: 1771] (stanton)
+4/28/99 (bug fix) Changed internal Tcl_Obj usage to avoid freeing the
+internal representation after the string representation has been
+freed.  This makes it easier to debug extensions. (stanton)
+4/30/99 (bug fix) Fixed a memory leak in CommandComplete. (stanton)
+5/3/99 (bug fix) Fixed a bug where the Tcl_ObjType was not being set
+in a duplicated Tcl_Obj. [Bug: 1975, 2047] (stanton)
+5/3/99 (bug fix) Changed Tcl_ParseCommand to avoid modifying eval'ed
+strings that are already null terminated.  [Bug: 1793] (stanton)
+5/3/99 (new feature) Applied Jeff Hobbs's string patch which includes
+the following changes:
+- added new subcommands: equal, repeat, map, is, replace
+- added -length option to "string compare|equal"
+- added -nocase option to "string compare|equal|match"
+- string and list indices can be an integer or end?-integer?.
+- added optional first and last index args to string toupper, et al.
+See the string.n manual entry for more details about the new string
+features.  [Bug: 1845] (stanton)
+5/6/99 (new feature) Added Tcl_UtfNcmp and Tcl_UtfNcasecmp to make Utf
+string comparision easier. (stanton)
+5/7/99 (bug fix) Improved OS/390 support. [Bug: 1976, 1997] (stanton)
+5/12/99 (bug fix) Changed Windows initialization code to avoid using
+GetUserName system call in favor of the env(USERNAME) variable.  This
+provides a significant startup speed improvement. (stanton)
+5/12/99 (bug fix) Replaced the per-interpreter regexp cache with a
+per-thread cache.  Changed the Regexp object to take advantage of this
+extra cache.  Added a reference count to the TclRegexp type so regexps
+can be shared by multiple objects.  Removed the per-interp regexp cache
+from the interpreter.  Now regexps can be used with no need for an
+interpreter. This set of changes should provide significant speed
+improvements for many Tcl scripts.  [Bug: 1063] (stanton)
+5/14/99 (bug fix) Durining initialization on Unix, Tcl now extracts the
+encoding subfield from the LANG/LC_ALL environment variables in cases
+where the locale is not found in the built-in locale table.  It also
+attempts to initialize the locale subsystem so X11 is happy. [Bug: 1989]
+(stanton)
+5/14/99 (bug fix) Applied the patch to fix 100-year and 400-year
+boundaries in leap year code, from Isaac Hollander.  [Bug: 2066] (redman)
+5/14/99 (bug fix) Fixed a crash caused by a failure to reset the result
+before evaluating the test expression in an uncompiled for
+statement. (stanton)
+5/18/99 (bug fix) Modified initialization code on Windows to avoid
+inherenting closed or invalid channels.  If the standard input is
+anything other than a console, file, serial port, or pipe, then we fall
+back to the standard Tk window console. (stanton)
+5/19/99 (bug fix) Added an extern "C" block around the entire tcl.h
+header file to avoid C++ linkage issues. (redman)
+5/19/99 (new feature) Applied Jeff Hobb's patch to add
+Tcl_StringCaseMatch to support case insensitive glob style matching and
+Tcl_UniCharIs* character classification functions. (stanton)
+5/20/99 (bug fix) Added the directory containing the executuble and the
+../lib directory relative to that to the auto_path variable. (redman)
+--------------- Released 8.1.1, May 25, 1999 ----------------------
+5/21/99 (bug fix) Fixed launching command.com on Win95/98, no longer
+hangs. [Bug: 2105] (redman)
+5/28/99 (bug fix) Fixed bug where dde calls were being passed an
+invalid dde handle. [Bug: 2124] (stanton)
+6/1/99  (bug fix) Small configure.in patches. [Bug: 2121] (stanton)
+6/1/99  (bug fix) Applied latest regular expression patches to fix an
+infinite loop bug and add support for testing whether a string could
+match with additional input. [Bug: 2117] (stanton)
+6/2/99  (bug fix) Fixed incorrect computation of relative ordering in
+Utf case-insensitive comparison. [Bug: 2135] (stanton)
+6/3/99  (bug fix) Fxied bug where string equal/compare -nocase
+reported wrong result on null strings. [Bug: 2138] (stanton)
+6/4/99  (new feature) Windows build now uses Cygwin tools plus GNU
+make and autoconf to build static/dynamic and debug/nodebug. (stanton)
+6/7/99  (new feature) Optimized string index, length, range, and
+append commands. Added a new Unicode object type. (hershey)
+6/8/99  (bug fix) Rolled back Windows socket driver to 8.1.0
+version. (stanton)
+6/9/99  (new feature) Added Tcl_RegExpMatchObj and Tcl_RegExpGetInfo
+to public Tcl API, these functions are needed by Expect.  Changed
+tools/genStubs.tcl to always write output in LF mode. (stanton)
+6/14/99 (new feature) Merged string and Unicode object types.  Added
+new public Tcl API functions:  Tcl_NewUnicodeObj, Tcl_SetUnicodeObj,
+Tcl_GetUnicode, Tcl_GetUniChar, Tcl_GetCharLength, Tcl_GetRange,
+Tcl_AppendUnicodeToObj. (hershey)
+6/16/99 (new feature) Changed to conform to TEA specification, added
+tcl.m4 and aclocal.m4 macro libraries for configure.  (wart)
+6/17/99 (new feature) Added new regexp interfaces: -expanded, -line,
+-linestop, and -lineanchor switches.  Renamed Tcl_RegExpMatchObj to
+Tcl_RegExpExecObj and added new Tcl_RegExpMatchObj that is equivalent
+to Tcl_RegExpMatch.  Added public macros for regexp flags.  Added
+REG_BOSONLY flag to allow Expect to iterate through a string and only
+find matches that start at the current position within the
+string. (stanton)
+6/21/99 (bug fix) Fixed memory leak in TclpThreadCreate where thread
+attributes were not being released.  [Bug: 2254] (stanton)
+6/23/99 (new feature) Updated Unicode character tables to reflect
+Unicode 2.1 data. (stanton)
+6/25/99 (new feature) Fixed bugs in non-greedy quantifiers for regular
+expression code. (stanton)
+6/25/99 (new feature) Added initial implementation of new Tcl test
+harness package.  Modified test files to use new tcltest package.
+(jenn)
+6/26/99 (new feature) Applied patch from Peter Hardie to add poke
+command to dde and changed the dde package version number to
+1.1. (redman)
+6/28/99 (bug fix) Applied patch from Peter Hardie to fix problem in
+Tcl_GetIndexFromObj() when the key being passed is the empty string.
+[Bug: 1738] (redman)
+6/29/99 (new feature) Added options to tcltest package: -preservecore,
+-limitconstraints, -help, -file, -notfile, and flags.  (jenn)
+7/3/99  (new feature) Changed parsing of variable names to allow empty
+array names.  Now "$(foo)" is a variable reference.  Previously you
+had to use something line $::(foo), which is slower.  This change was
+requested by Jean-Luc Fontaine for his STOOOP package. (welch)
+7/3/99  (new feature) Added Tcl_SetNotifier (public API) and
+associated hook points in the notifiers to be able to replace the
+notifier calls at runtime. The Xt notifier and test program use this
+hook.  (welch)
+7/3/99  (new feature) Added a new variant of the "Trf core patch" from
+Andreas Kupries that adds new C APIs Tcl_StackChannel,
+Tcl_UnstackChannel, and Tcl_GetStackedChannel.  This allows the Trf
+extension to work without applying patches to the Tcl core. (welch)
+7/6/99  (new feature) Added -timeout option to http.tcl to handle
+timeouts that occur during connection attempts to hosts that are
+down. (welch)
+7/6/99  (bug fix) Applied new implementation of the Windows serial
+port driver from Rolf Schroedter that fixes reading only one byte from
+the port at a time.  Uses polling every 10ms to implement
+fileevents. [Bug: 1980 2217] (redman)
+7/8/99  (bug fix) Applied fix for bug in DFA state caching under
+lookahead conditions (regular expressions).  [Bug: 2318] (stanton)
+7/8/99  (bug fix) Fixed bug in string range bounds checking
+code. (stanton)
+--------------- Released 8.2b1, July 14, 1999 ----------------------
+7/16/99 (bug fix) Added Tcl_SetNotifier to stub table. [Bug: 2364]
+Added check for Alpha/Linux to correct the IEEE  floating point flag,
+patch from Don Porter. (redman)
+7/20/99 (bug fix) Merged 8.0.5 code to handle tcl_library properly,
+also fixed a bug that caused TCL_LIBRARY to be ignored. (hershey)
+7/21/99 (bug fix) Implemented modified socket driver for Windows that
+uses a thread to manage the socket event window.  Code works the same
+on all supported versions of Windows and was based on original 8.1.0
+code.  [Bug: 2178 2256 2259 2329 2323 2355] (redman)
+7/21/99 (new feature) Applied patch from Rolf Schroedter to add
+-pollinterval option to fconfigure for Windows serial ports.  Allows
+the maxblocktime to be modified to control how often serial ports are
+checked for fileevents.  Also added documentation for \\.\comX
+notation for opening serial ports on Windows.  (redman)
+7/21/99 (bug fix) Changed APIs in stub tables to use "unsigned long"
+instead of the platform-specific "size_t", primarily after SunOS 4
+users could no longer compile. (redman)
+7/22/99 (bug fix) Fixed crashing during "array set a(b) {}".
+[Bug: 2427] (redman)
+7/22/99 (bug fix) The install-sh script must be given execute
+permissions prior to running.  [Bug: 2413] (redman)
+7/22/99 (bug fix) Applied patch from Ulrich Ring to remove ANSI-style
+prototypes in the code.  [Bug: 2391] (redman)
+7/22/99 (bug fix) Added #if blocks around #includes of sys/*.h header
+files, to allow an extension author on Windows to use the MetroWerks
+compiler. [Bug: 2385] (redman)
+7/22/99 (bug fix) Fixed running the safe.test test suite, one change
+to the Windows Makefile.in to fix paths and another in safe.test to
+check for the tcl_platform(threaded) variable properly. (redman)
+7/22/99 (bug fix) Fixed hanging in new Win32 socket driver with
+threads enabled. (redman)
+7/26/99 (bug fix) Fixed terminating of helper threads by holding any
+mutexes from the primary thread while waiting for the helper thread to
+terminate.  Fixes dual-CPU WinNT hangs, only one rare sporadic hang
+that still exists with dual-CPU WinNT.  Also fixed test cases so that
+they would not depend as much on timing for dual-CPU WinNT. (redman)
+7/27/99 (bug fix) Some test suite cleanup. (jenn)
+7/29/99 (bug fix) Applied patch to fix typo in .SH NAME line in
+doc/Encoding.n [Bug: 2451].  Applied patch to avoid linking pack.n to
+pack-old.n [Bug: 2469]. Patches from Don Porter. (redman)
+7/29/99 (bug fix) Allow tcl to open CON and NUL, even for redirection
+of std channels.  [Bug: 2393 2392 2209 2458] (redman)
+7/30/99 (bug fix) Applied fixed Trf patch from Andreas Kupries.
+[Bug: 2386] (hobbs)
+7/30/99 (bug fix) Fixed bug in info complete. [Bug: 2383 2466] (hobbs)
+7/30/99 (bug fix) Applied patch to fix threading on Irix 6.5, patch
+provided by James Dennett.  [Bug: 2450] (redman)
+7/30/99 (bug fix) Fixed launching of 16bit applications on Win9x from
+wish.  The command line was being primed with tclpip82.dll, but it was
+ignored later.
+7/30/99 (bug fix) Added functions to stub table, patch provided by Jan
+Nijtmans. [Bug: 2445] (hobbs)
+8/1/99  (bug fix) Changed Windows socket driver to terminate threads
+by sending a message to the window rather than calling
+TerminateThread(), which seems to leak about 4k from the helper
+thread's stack space. (redman)
+--------------- Released 8.2b2, August 5, 1999 ----------------------
+8/4/99 (bug fix) Applied patches supplied by Henry Spencer to greatly
+enhance performance of certain classes of regular expressions.
+[Bug: 2440 2447] (stanton)
+8/5/99 (doc change) Made it clear that tcl_pkgPath was not set for
+Windows. [Bug: 2455] (hobbs)
+8/5/99 (bug fix) Fixed reference to bytes that might not be null
+terminated in tclLiteral.c. [Bug: 2496] (hobbs)
+8/5/99 (bug fix) Fixed typo in http.tcl. [Bug: 2502] (hobbs)
+8/9/99 (bug fix) Fixed test suite to handle larger integers
+(64bit). Patch from Don Porter. (hobbs)
+8/9/99 (documentation fix) Clarified Tcl_DecrRefCount docs
+[Bug: 1952]. Clarified array pattern docs [Bug: 1330]. Fixed clock docs
+[Bug: 693]. Fixed formatting errors [Bug: 2188 2189]. Fixed doc error
+in tclvars.n [Bug: 2042]. (hobbs)
+8/9/99 (bug fix) Fixed path handling in auto_execok [Bug: 1276] (hobbs)
+8/9/99 (internal api change) Removed the TclpMutexLock and TclpMutexUnlock
+APIs and added a new exported api, Tcl_GetAllocMutex. These APIs are all for
+the mutex used in the simple memory allocators.  By making this change
+we are able to substitute different implementations of the thread-related
+APIs without having to recompile the Tcl core. (welch)
+8/9/99 (new C API) Tcl_GetChannelNames returns a list of open channel
+names in the interpreter result.  Still no Tcl-level version of this,
+but server-like applications can use this to clean up files without
+deleting interpreters. (welch)
+8/9/99 (bug fix) Traces were not firing on "info exists", which used to
+happen in Tcl 7.6 and earlier. An "info exists" now fires a read trace,
+if defined.  This makes it possible to fully implement variables that
+are defined via traces. (welch)
+8/10/99 (bug fix) Fixed Brent's changes so that they work on
+Windows. (redman)
+--------------- Released 8.2b3, August 11, 1999 ----------------------
+8/12/99 (Mac) Rearrange projects in tclMacProjects.sea.hqx so that the
+build directory is separate from the sources. (Jim Ingham)
+8/12/99 (bug fix) Fixed bug in Tcl_EvalEx where the termOffset was not
+being updated in cases where the evaluation returned a non TCL_OK
+error code. [Bug: 2535] (stanton)
+--------------- Released 8.2.0, August 17, 1999 ----------------------
+9/21/99 (config fixes) fixed several AIX configuration issues.  gcc and
+threading may still cause problems on AIX. (hobbs)
+9/21/99 (bug fix) fixed expr double-eval problem. [Bug: 732] (hobbs)
+9/21/99 (bug fix) fixed static buffer overflow problem. [Bug: 2483] (hobbs)
+9/21/99 (bug fix) fixed end-int linsert interpretation. [Bug: 2693] (hobbs)
+9/21/99 (bug fix) fixed bug when setting array in non-existent
+namespace. [Bug: 2613] (hobbs)
+--- Released 8.2.1, October 04, 1999 --- See ChangeLog for details ---
+10/30/99 (feature enhancement) new regexp engine from Henry Spencer
+was patched in - should greatly reduce stack space usage. (spencer)
+10/30/99 (bug fix) fixed Purify reported memory leaks in findexecutable
+test command, TclpCreateProcess on Unix, in handling of C environ array,
+and in testthread code.  No more known (reported) mem leaks for Tcl
+built using gcc on Solaris 2.5.1.  Also none reported for Tcl on NT
+(using Purify 6.0). (hobbs)
+10/30/99 (bug fix) fixed improper bytecode handling of
+'eval {set array($unknownvar) 5}' (also for incr) (hobbs)
+10/30/99 (bug fix) fixed event/io threading problems by making
+triggerPipe non-blocking (nick kisserbeth)
+10/30/99 (bug fix) fixed Tcl_AppendStringsToObjVA and Tcl_AppendResultVA
+to only	iterates once over the va_list (avoiding non-portable memcpy).
+(joe english, hobbs)
+10/30/99 (bug fix) removed savedChar trick in tclCompile.c that appeared
+to be causing a segv when the literal table was released.
+[Bug: 2459, 2515] (David Whitehouse)
+10/30/99 (bug fix) fixed [string index] to return ByteArrayObj
+when indexing into one (test case string-5.16) [Bug: 2871] (hobbs)
+10/30/99 (bug fix) fixes for mac UTF filename handling (ingham)
+--- Released 8.2.2, November 04, 1999 --- See ChangeLog for details ---
+11/19/99 (feature enhancement) bug fixes for http package as well as
+patch required by TLS (SSL) extension that adds http::(un)register
+and -type to http::geturl.  Up'd http pkg version to 2.2.
+11/19/99 (bug fix) removed extra decr of numLevels in Tcl_EvalObjEx
+that could cause seg fault (mjansen@wendt.de)
+11/19/99 (bug fixes) numerous minor big fixes, including correcting the
+installation of the koi8-r encoding and tcltest1.0 on Windows.
+11/30/99 (bug fix) fixes scan where %[..] didn't match anything
+11/30/99 (bug fix) fixed setting of isNonBlocking flag in PipeBlockModeProc
+so you can now close a non-blocking channel without waiting.
+11/30/99 (bug work-around) prevented the unloading of DLLs for Unix in
+TclFinalizeLoad.  This stops the seg fault on exit that some users would
+see (ie with oratcl) when using DLLs that do nasty things like register
+atexit handlers.
+12/07/99 (bug fix) fixes for 'expr + {[incr]}' and 'expr + {[error]}'
+cases (different causes).
+--- Released 8.2.3, December 16, 1999 --- See ChangeLog for details ---
+1999-09-14 (feature enhancement) added -start switch to regexp and regsub.
+1999-09-15 (feature enhancement) add 'array unset' command.
+1999-09-15 (feature enhancement) rewrote runtime libraries to use new
+string functions
+1999-08-18 (feature enhancement) added 'file channels' command, along with
+Tcl_GetChannelNames(Ex) public C APIs.
+1999-10-19 (feature enhancement) enhanced tcltest package
+1999-09-16 (feature enhancement) added -milliseconds switch to 'clock clicks'
+1999-10-28 (feature enhancement) added support for inline 'scan'
+1999-10-28 (feature enhancement) added support for touch functionality by
+extendeding 'file atime' and 'file mtime' to take an optional time argument
+1999-11-24 (feature enhancement) added 'fconfigure $sock -lasterror'
+command to Windows to query the last error received on a serial socket.
+1999-11-30 (bug fix) fixed handling of %Z on NT for timezones that don't
+have DST
+1999-12-03 (feature enhancement) improved error message in bad octal cases
+and improper use of comments. (hobbs)
+1999-12-07 (bug fix) fixed Tcl_ScanCountedElement to not step
+beyond the end of the counted string
+1999-12-09 (feature enhancement) removed all references to 16 bit
+compatibility code for Windows (hobbs)
+1999-12-10 (bug fix) removed check for vfork - Tcl now uses only fork in
+exec. (hobbs)
+1999-12-10 (optimization) changed Tcl_ConcatObj to return a list
+object when it receives all pure list objects as input (used by 'concat'),
+added optimizations in Tcl_EvalObjEx for pure list case, and optimized
+INST_TRY_CVT_TO_NUMERIC in TclExecuteByteCode for boolean objects.
+(oakley, hobbs)
+1999-12-12 (feature enhancement) enhanced glob command with -type, -path,
+-directory and -join switches. (darley, hobbs)
+1999-12-21 (bug fix) changed CreateThread to _beginthreadex and
+ExitThread to _endthreadex to prevent 4K mem leak (gravereaux)
+1999-12-21 (bug fix) fixed applescript for I18N
+1999-12-21 (feature enhancement) added -unique option to lsort (hobbs)
+1999-12-21 (bug fix) changed thread ids to longs (for 64bit systems)
+--- Released 8.3b1, December 22, 1999 --- See ChangeLog for details ---
+2000-01-10 (feature enhancement) clock scan now supports the common
+ISO 8601 date/time formats.  See docs for details. (melski)
+2000-01-10 (bug fix) prevented \ooo substitution from accepting
+non-octal digits [Bug: 3975] (hobbs)
+2000-01-11 (bug fix) fixed improper handling of DST by clock when
+using relative times (like "1 month" or "tomorrow"). (melski)
+2000-01-12 (bug fix) improved build support for Tru64 v5, NetBSD
+and Reliant Unix (hobbs)
+2000-01-12 (bug fix) made imported commands also import their
+compile procedure (duffin)
+2000-01-12 (bug fix) fixed 'info procs ::namesp::*' behavior to return
+procs in a namespace (dejong)
+2000-01-12 (feature enhancement) added support for setting permissions
+symbolicly (like chmod) in [file attributes $file -permissions ...] (schoebel)
+2000-01-13 (bug fix) fixed lsort -dictionary problem when sorting
+characters between 'Z' and 'a' (flawed upper/lower comparison logic) (melski)
+--- Released 8.3b2, January 13, 2000 --- See ChangeLog for details ---
+2000-01-14 (feature enhancement) clock format %Q added, clock scan updated
+2000-01-20 (bug fix) corrected complex array elem compiling (Spjuth)
+2000-01-20 (bug fix) made [info body] always return a string type arg,
+to prevent possible misuse of bytecodes in the wrong context (hobbs)
+2000-01-20 (bug fixes) several fixes to variable handling to prevent
+possible crashes, and further definition of correct behavior (melski)
+2000-01-25 (bug fixes) improved QNX, Ultrix and OSF1 (Tru64) config and
+compatibility (edge, furukawa)
+2000-01-25 (bug fix) fixed mem leak when calling lsort with a bad -command
+argument (hobbs)
+2000-01-27 (feature enhancement) package mechanism overhaul: changed
+behavior of pkg_mkIndex to do -direct by default, added -lazy option.
+Fixed pkg_mkIndex to handle odd proc names and auto_mkIndex to use platform
+independent file paths.  Other fixes for odd package quirks.  Added
+::pkg namespace and ::pkg::create helper function. (melski)
+2000-02-01 (bug fix) fixed problem where http POST would send one extra
+newline (vasiljevic)
+2000-02-02 (feature enhancement) added docs for new regexp -inline and
+-all switches. (hobbs)
+2000-02-08 (bug fix) corrected handling of "next monthname" in clock scan
+(melski)
+2000-02-09 (bug fix) restored Mac source to build readiness and prevented
+mac panic from an error when closing an async socket (steffen, ingham)
+2000-02-10 (feature enhancement) improved error reporting for failed
+loads on Windows (dejong, hobbs)
+--- Released 8.3.0, February 10, 2000 --- See ChangeLog for details ---
+2000-03 (bug fixes, feature enhancement) overhaul of http package for
+proper handling of async callbacks (new options), version is now at 2.3
+(tamhankar, welch)
+2000-03 (performance enhancement) speedup in Windows filename handling (newman)
+and ==/!= empty string in exprs. (hobbs)
+2000-03-27 (bug fix) added uniq'ing test to namespace export list to
+prevent unnecessary mem growth (hobbs)
+2000-03-29 (bug fix) fixed mem leak when repeatedly sourcing the same
+bytecompiled (tbc) code repeatedly across different interpreters (hobbs)
+2000-03-29 (config enhancement) improved build support for gcc/mingw on
+Windows (nijtmans, hobbs) and added RPM target (melski)
+2000-03-31 (bug fix) corrected data encoding problem when using
+"exec << $data" construct (melski)
+2000-04 (feature enhancement) overhaul of threading mechanism to better
+support tcl level thread command (new APIs Tcl_ConditionFinalize,
+Tcl_MutexFinalize, Tcl_CreateThread, etc, all docs in Thread.3).
+(kupries, graveraux)
+This enables the tcl level thread extension. (welch)
+2000-04-10 (bug fix) fixed infinite loop case in regexp -all (melski)
+2000-04-13 (config enhancement) added support for --enable-64bit-vis
+Sparc target. (hobbs)
+2000-04-18 (bug fix) moved tclLibraryPath to thread-local storage to fix
+possible race condition on MP machines (hobbs)
+2000-04-18 (config enhancement) added MacOS X build target and
+tclLoadDyld.c dl type. (sanchez)
+2000-04-23 (bug fix) several Mac socket fixes (ingham)
+2000-04-24 (bug fix) fixed hang in threaded Unix case when backgrounded
+exec process was running (dejong)
+--- Released 8.3.1, April 26, 2000 --- See ChangeLog for details ---
+2000-04-26 (doc fix) updated/added documentation for many API's and
+commands (melski)
+2000-05-02 (feature enhancement) added support for joinable threads;
+extended API's for channels to allow channels to move between threads
+(kupries)
+2000-05-02 (feature enhancement) changed error return for procedures
+with incorrect args to be like the Tcl_WrongNumArgs API, with a "wrong
+# args: ..." message printed, with an args list (hobbs)
+2000-05-08 (feature enhancement) added [array statistics] command
+2000-05-08 (performance enhancement) rewrote Tcl_StringCaseMatch
+algorithm for better performance; this affects the [string match]
+command; added "eq" and "ne" operands to expr, for testing
+string equality and inequality (hobbs)
+2000-05-09 (feature enhancement) extended [lsearch] to support sorted
+list searches and typed list searches (melski)
+2000-05-10 (feature enhancement) added [namespace exists] command
+(darley)
+2000-05-18 (build enhancement) added support for mingw compile env and
+cross-compiling (dejong)
+2000-05-18 (bug fix) corrected clock grammar to properly handle the
+"ago" keyword when it follows multiple relative unit specifiers
+(melski)
+2000-05-22 (compile fix) type cast cleanups (dejong)
+2000-05-23 (performance enhancement) added byte-compiled
+implementation of [return] command and [string] command (melski)
+2000-05-26 (performance enhancement) extended byte-compiled [string]
+command with support for [string compare/index/match] (hobbs)
+2000-05-27 (feature enhancement) added ability to set [info script]
+return value ([info script ?newFileName?]) (welch)
+2000-05-31 (feature enhancement) added support for regexp and exact
+pattern matching for [array names] (gazetta)
+2000-05-31 (feature enhancement) added -nocomplain and -- flags to
+[unset] to allow for silent unset operation (hobbs)
+--- Released 8.4a1, June 6, 2000 --- See ChangeLog for details ---
+2000-05-29 (bug fix) corrected resource cleanup in http error cases.
+Improved handling of error cases in http. (tamhankar)
+2000-07 (feature rewrite) complete rewrite of the Tcl IO channel subsystem
+to correct problems (hangs, core dumps) with the initial stacked channel
+implementation.  The new system has many more tests for robustness and
+scalability.  There are new C APIs (see Tcl_CreateChannel), but only
+stacked channel drivers are affected (ie: TLS, Trf, iogt).  The iogt
+extension has been added to the core test code to test the system.
+(hobbs, kupries)
+	**** POTENTIAL INCOMPATABILITY ****
+2000-07 (build improvements) cleanup of the makefiles and configure scripts
+to correct support for building under gcc for Windows. (dejong)
+2000-08-07 (bug fix) corrected sizeof error in Tcl_GetIndexFromObjStruct.
+(perkins)
+2000-08-07 (bug fix) correct off-by-one error in HistIndex, which was
+causing [history redo] to start its search at the wrong event index. (melski)
+2000-08-07 (bug fix) corrected setlocale calls for XIM support and locale
+issues in startup. (takahashi)
+2000-08-07 (bug fix) correct code to handle locale specific return values
+from strftime, if any. (wagner)
+2000-08-07 (bug fix) tweaked grammar to properly handle the "ago" keyword
+when it follows multiple relative unit specifiers, as in
+"2 days 2 hours ago". (melski)
+2000-08-07 (doc fixes) numerous doc fixes to correct SEE ALSO and NAME
+sections. (english)
+2000-08-07 (bug fix) new man pages memory.n, TCL_MEM_DEBUG.3, Init.3 and
+DumpActiveMemory.3. (melski)
+--- Released 8.3.2, August 9, 2000 --- See ChangeLog for details ---
+2000-06 thru 2000-11 (build improvements) Added support for mingw (gcc on
+Windows), AIX-5 and Win64 builds (dejong, hobbs)
+2000-06-23 (feature enhancement) ability to use Tcl_Obj *s as hash keys (duffin)
+2000-06-29 (new features) added [mcmax] and [mcmset] and extended [unknown] in
+msgcat package (duperval, krone, nelson)
+=> msgcat 1.1
+2000-08 thru 2000-09 added tclPlatDecls.h to default install (melski, hobbs)
+2000-08-24 (new feature) Enhanced trace syntax to add:
+	trace {add|remove|list} {variable|command} name ops command
+(darley, melski)
+2000-09-06 (cross-platform feature) Set ^Z (\32) as default EOF char. (hobbs)
+2000-09-07 partial fix for bug 2460 to prevent exec mem leak on Windows for the
+common case (gravereaux)
+2000-09-14 Improved string allocation growth for large strings (hintermayer,
+melski)
+2000-09-14 New non-panic'ing mem allocation functions Tcl_AttemptAlloc,
+Tcl_AttemptRealloc, Tcl_AttemptSetObjLength (melski)
+2000-09-20 (new features) completely new, enhanced syntax in tcltest package.
+Backwards compatable with tcltest v1. (hom)
+=> tcltest 2.0
+2000-09-27 (bug fix) fixed a bug introduced by a partial fix in 8.3.2 that
+didn't set nonBlocking correctly when resetting the flags for the write
+side (mem leak) Correct mem leak in channels when statePtr was released
+(hobbs)
+2000-09-29 (bug fix) corrected reporting of space parity on Windows (Eason)
+2000-10-06 (bug fix) corrected [file channels] to only return channels in
+the current interpreter (hobbs)
+2000-10-20 (performance enhancement) call stat only when necessary in 'glob' to
+speed up command significantly in base cases (hobbs)
+2000-10-27 Fixed mem leak in Tcl_CreateChannel. Re-purified core via test
+suites.  (hobbs)
+2000-10-30 (new feature) add "ja_JP.eucJP" map to "euc-jp" encoding (takahashi)
+2000-11-01 (mem leak) Corrected excessive mem use of info exists on a
+non-existent array element (hobbs)
+2000-11-02 (bug fix) Corrected sharing of tclLibraryPath in threaded
+environment (gravereaux)
+2000-11-03 (new feature) Tcl_SetMainLoop enables defining an event loop for
+tclsh.  This enables Tk as a truly loadable package. (hobbs)
+--- Released 8.4a2, November 3, 2000 --- See ChangeLog for details ---
+2000-09-27 (bug fix) fixed a bug introduced by a partial fix in 8.3.2 that
+didn't set nonBlocking correctly when resetting the flags for the write
+side (mem leak) Correct mem leak in channels when statePtr was released
+(hobbs)
+2000-09-29 (bug fix) corrected reporting of space parity on Windows (Eason)
+2000-10-06 (bug fix) corrected [file channels] to only return channels in
+the current interpreter (hobbs)
+2000-10-20 (performance enhancement) call stat only when necessary in 'glob' to
+speed up command significantly in base cases (hobbs)
+2000-11-01 (mem leak) Corrected excessive mem use of info exists on a
+non-existent array element (hobbs)
+2000-11-02 (bug fix) Corrected sharing of tclLibraryPath in threaded
+environment (gravereaux)
+2000-11-23 (mem leak) fixed potential memory leak in error case of lsort
+(fellows)
+2000-12-09 (feature enhancement) changed %o and %x to use strtoul instead
+of strtol to correctly preserve scan<>format conversion of large integers
+(hobbs)
+Fixed handling of {!<boolean>} in expressions (hobbs, fellows)
+2000-12-14 (feature enhancement) improved (s)rand for 64-bit platforms
+(porter)
+2001-01-04 (bug fix) corrected parsing of $tcl_libPath at startup on
+Windows (porter)
+2001-01-30 (bug fix) Fixed possible hangs in fcopy. (porter)
+2001-02-15 (performance enhancement) improved efficiency of [string split]
+(fellows)
+2001-03-13 (bug fix) Correctly possible memory corruption in string map {}
+$str (fellows)
+2001-03-29 (bug fix) prevent potential race condition and security leak in
+tmp filename creation on Unix. (max)
+Fixed handling of timeout for threads (corrects excessive CPU usage issue
+for Tk on Unix in threaded Tcl environment). (ruppert)
+2001-03-30 (bug fix) corrected Windows memory error on exit (wu)
+Fixed race condition in readability of socket on Windows.
+2001-04-03 (doc fixes) numerous doc corrections and clarifications.
+Update of READMEs.
+2001-04-04 (build improvements) redid Mac build structure (steffen)
+Corrected IRIX-5* configure (english).  Added support for AIX-5 (hobbs).
+Added support for Win64 (hobbs).
+--- Released 8.3.3, April 6, 2001 --- See ChangeLog for details ---
+2000-11-23 (new feature)[TIP 7] higher resolution timer on Windows (kenny)
+2001-01-18 (new feature) Tcl_InitHashTableEx renamed to Tcl_InitCustomHashTable
+(kupries)
+2001-03-30 (new feature)[TIP 10] support for thread-aware/hot channels (kupries)
+2001-04-06 (new feature)[219280] auto-loading hidden in ::errorInfo (porter)
+2001-04-07 (bug fix)[406709] corrected panic when extra items left on the
+byte compiler execution stack (sofer)
+2001-04-09 (bug fix)[219136,232558] improved use of thread-safe functions in
+unix time commands (kenny)
+2001-04-24 (new feature)[TIP 27] started CONST-ification of the Tcl APIs (kenny)
+2001-05-03 (new feature) [auto_import] now matches patterns like
+[namespace import], not like [string match] (porter)
+**** POTENTIAL INCOMPATABILITY ****
+2001-05-07 (new feature)[416643] distinct srand() seed per interp (sofer)
+2001-05-15 (new feature) new Tcl_GetUnicodeFromObj API (hobbs)
+2001-05-16 (performance enhancement) byte-compiled versions of [lappend],
+[append] simple cases (hobbs)
+2001-05-23 (new feature) added ISO-8859-15 and koi8-u encodings, updated other
+encoding tables based on http://www.unicode.org/Public/MAPPINGS/ (kuhn)
+2001-05-27 (new feature) updated to Unicode 3.1.0 data set (still using 16
+bits for Tcl_UniChar though) (hobbs)
+2001-05-30 (new feature)[TIP 15] Tcl_GetMathFuncInfo, Tcl_ListMathFuncs,
+Tcl_InfoObjCmd, InfoFunctionsCmd APIs (fellows)
+2001-06-08 (bug fix,feature enhancement)[219170,414936] all Tcl_Panic
+definitions brought into agreement (porter)
+2001-06-12 (bug fix)[219232] regexp returned non-matching sub-pairs to have
+index pair {-1 -1} (fellows)
+2001-06-27 (bug fix)[217987] corrected backslash substitution of non-ASCII
+characters.  (hobbs, riefenstahl)
+2001-06-28 (bug fix)[231259] failure to re-compile after cmd shadowing (sofer)
+2001-07-02 (bug fix)[227512] corrected [concat] treatment of UTF-8 strings
+(hobbs, barras)
+2001-07-12 (new feature)[TIP 36] Tcl_SubstObj API (fellows)
+2001-07-16 (bug fix) corrected thread-enabled pipe closing on Windows
+(hobbs, jsmith)
+2001-07-18 (bug fix)[427196] corrected memory overwrite error when buffer size
+of a channel is changed after channel use has already begun (kupries, porter)
+2001-07-31 (new feature)[TIP 17] TclFS* APIs provide new virtual file
+system.  This includes the addition of 'file normalize', 'file system',
+'file separator' and 'glob -tails' (darley)
+2001-08-06 (bug fix) removed use of tmpnam in TclpCreateTempFile on Unix (lim)
+* improved build support for IRIX, GNU HURD, Mac OS 9 and OS X
+* configure scripts revamped for better support of cygwin and gcc on
+Windows (mdejong)
+* corrected several minor errors noted by Purify (hobbs)
+--- Released 8.4a3, August 6, 2001 --- See ChangeLog for details ---
+2001-06-27 (bug fix)[217987] corrected backslash substitution of non-ASCII
+characters.  (hobbs, riefenstahl)
+2001-06-28 (bug fix)[231259] failure to re-compile after cmd shadowing (sofer)
+2001-07-02 (bug fix)[227512] corrected [concat] treatment of UTF-8 strings
+(hobbs, barras)
+2001-07-16 (bug fix) corrected thread-enabled pipe closing on Windows
+(hobbs, jsmith)
+2001-07-18 (bug fix)[427196] corrected memory overwrite error when buffer size
+of a channel is changed after channel use has already begun (kupries, porter)
+2001-08-06 (bug fix)[442665] corrected object reference counting in [gets]
+(jikamens)
+2001-08-06 (new feature) added GNU (HURD) configuration target. (brinkmann)
+2001-08-07 (bug fix)[406709] corrected panic when extra items left on the
+byte compiler execution stack (see test foreach-5.5) (sofer, tallneil, jstrot)
+2001-08-08 (new features) updated packages msgcat 1.1.1, opt 0.4.3,
+tcltest 1.0.1, dependencies checked (porter)
+2001-08-20 (new feature)[452217] http 2.3.2: include port number in Host: header
+to comply with HTTP/1.1 spec (RFC 2068)  (hobbs, tils)
+2001-08-23 (new feature) added QNX-6 build support (loverso)
+2001-08-23 (bug fix) corrected handling of spaces in path name passed to
+[exec] on Windows (kenpoole)
+2001-08-24 (bug fix) corrected [package forget] stopping on non-existent
+package (porter)
+2001-08-24 (bug fix) corrected construction of script library search path
+relative to executable (porter)
+2001-08-24 (bug fix) [auto_import] now matches patterns like
+[namespace import], not like [string match] (porter)
+**** POTENTIAL INCOMPATABILITY ****
+2001-08-27 (new feature) added Tcl_SetMainLoop() to enable loading Tk as a
+true package (hobbs)
+2001-08-30 (bug fix) build support for Crays (andreasen)
+2001-09-01 (bug fix) rewrite of Tcl_Async* APIs to better manage thread
+cleanup  (gravereaux)
+2001-09-06 (new feature) http 2.4: honor the Content-encoding and charset
+parameters; add -binary switch for forcing the issue (hobbs, saoukhi, orwell)
+=> http 2.4
+2001-09-06 (performance enhancement) rewrite of file I/O flush management on
+Windows.  Approximately 100x speedup for some operations. (kupries, traum)
+2001-09-10 (bug fix) corrected finalization error in TclInExit (darley)
+2001-09-10 (bug fix) protect against alias loops (hobbs)
+2001-09-12 (bug fix) added missing #include in tclLoadShl.c (techentin)
+2001-09-12 (bug fix) script library path construction on Windows no longer
+uses registry, nor adds the current working directory to the path (porter)
+2001-09-12 (bug fix) correct bugs in compatibility strtod() (porter)
+2001-09-13 (bug fix) Tcl_UtfPrev now returns the proper location when the
+middle of a UTF-8 byte is passed in (hobbs)
+2001-09-19 (bug fix) [format] and [scan] corrected for 64-bit machines (rmax)
+2001-09-19 (new feature) --enable-64-bit support for HP-11. (hobbs)
+2001-09-19 (new feature) native memory allocator now default on Windows
+(hobbs)
+2001-09-20 (new feature) WIN64 support and extra processor definitions
+(hobbs, mstacy)
+2001-09-26 (bug fix) corrected potential deadlock in channels that do not
+provide a BlockModeProc (kupries, kogorman)
+2001-10-03  (new feature) WIN64 build support (hobbs)
+2001-10-03 (bug fix) correction in thread finalization (rbrunner)
+2001-10-04 (new feature) updated encodings with latest mappings from
+www.unicode.org (hobbs)
+2001-10-11 (bug fix) corrected cleanup of self-referential bytecodes at
+interpreter deletion (sofer, rbrunner)
+2001-10-16 (new feature) config support for MacOSX / Darwin (steffen)
+2001-10-16 (new feature, Mac) change in binary extension format from MachO
+bundles to standard .dylib dynamic libraries like on other unices.
+*** POTENTIAL INCOMPATIBILITY ***
+2001-10-18 (bug fix) corrected off-by-one-day error in clock scan with
+relative months and years during swing hours. (lavana)
+--- Released 8.3.4, October 19, 2001 --- See ChangeLog for details ---
+2001-08-21 (bug fix)[219184] overagressive compilation of [catch] (sofer)
+2001-08-22 (new feature)[227482] [dde request -binary] (hobbs)
+=> dde 1.2
+2001-08-30 (performance enhancement)[456668] fully qualified command names use
+cached Command for all namespaces, avoiding repeated lookups (sofer)
+2001-08-31 (performance enhancement) bytecompiled [list] (hobbs)
+2001-09-02 (bug fix)[403553] Add -Zl to VC++ compile line for tclStubLib to
+avoid any specific C-runtime library dependence. (gravereaux)
+2001-09-05 (new feature) restored support for Borland compiler (gravereaux)
+2001-09-05 (new feature)[TIP 49] Tcl_OutputBuffered API (schroedter, fellows)
+2001-09-07 (new feature) restored VC++ 5.0 compatibility (gravereaux)
+2001-09-10 (performance enhancement)[TIP 53,451441] [proc foo args {}] now
+compiles to 0 bytecodes (sofer)
+2001-09-13 (new feature)[TIP 56] Tcl_EvalTokensStandard API (sofer)
+2001-09-13 (new feature) Old ChangeLog entries => ChangeLog.1999 (hobbs)
+2001-09-17 (new feature) compiling with TCL_COMPILE_DEBUG now required to
+enable all compile and execution tracing (sofer)
+*** POTENTIAL INCOMPATIBILITY ***
+2001-09-19 (bug fix)[411825] made TclNeedSpace UTF-8 aware (fellows)
+2001-09-19 (bug fix)[219166] overagressive compilation of "quoted" bodies of
+[for], [foreach], [if], and [while] (sofer)
+2001-09-19 (performance enhancement) bytecompiled [string match] (hobbs)
+2001-10-15 (new feature)[TIP 35] serial channel configuration: Win (schroedter)
+2001-11-06 (bug fix)[478856] loss of fileevents due to short reads (kupries)
+2001-11-06 (new feature) revitalized makefile.vc (gravereaux)
+2001-11-07 (new feature) Cygwin gcc support dropped.  Use mingw (dejong)
+*** POTENTIAL INCOMPATIBILITY ***
+2001-11-07 (new feature) Support --include-dir= and --libdir= options to
+configure.  Store in tclConfig.sh as TCL_INCLUDE_SPEC and TCL_LIB_SPEC.
+(dejong)
+*** POTENTIAL INCOMPATIBILITY ***
+2001-11-08 (new feature) Enable --enable-threads on FreeBSD (dejong)
+2001-11-08 (new feature) New make target 'make gdb' (dejong)
+2001-11-09 (bug fix)[480176] [global] mishandled varnames matching :* (porter)
+2001-11-12 (new feature)[TIP 22,33,45] new command [lset],
+[lindex] extended to accept multiple indices. (kenny, hobbs)
+2001-11-16 (new feature) new configure option --enable-langinfo=no.
+By default, nl_langinfo() is used on Unix to determine system encoding.
+Tcl's built-in system is used only if that fails, or configured with
+--enable-langinfo=no. (hobbs, wagner)
+2001-11-19 (new feature)[TIP 62] A Tcl_VarTraceProc can now return Tcl_Obj *
+or a dynamic string as well as a static string to indicate an error (fellows)
+2001-11-19 (new feature)[TIP 73] Tcl_GetTime API (kenny)
+2001-11-19 (bug fix)[478847] overflows in [time] of >2**31 microseconds (kenny)
+2001-11-29 (performance enhancement) caching scheme added to [binary scan]
+(fellows)
+2001-12-05 (new feature) new algorithm for [array get] adds safety when read
+traces modify the array. (sofer)
+*** POTENTIAL INCOMPATIBILITY ***
+2001-12-10 (bug fix)[490514] doc fixes (porter,english)
+2001-12-18 (new feature) removed unix/dltest/configure; unix/configure does
+all (dejong)
+2001-12-19 (new feature) New make target 'make shell' (dejong)
+2001-12-21 (new feature) MaxOSX / Darwin support (steffen)
+2001-12-28 (new feature) new command [memory onexit] replaces [checkmem] when
+compiled with TCL_MEM_DEBUG.  Added documentation. (porter)
+*** POTENTIAL INCOMPATIBILITY ***
+2001-12-28 (bug fix) proper case in [auto_execok] use of $env(COMPSPEC) (hobbs)
+2002-01-05 (feature rewrite) Tcl_Main() rewritten and documentation improved.
+Interactive operation and event loop operation (via Tcl_SetMainLoop) now
+interleave cleanly.  Also more robust against strange happenings. (porter)
+2002-01-17 (bug fix)[504642] Tcl_Obj refCounts in [gets] (griffen,kupries)
+2002-01-21 (bug fix)[506297] infinite loop writing in iso2022-jap encoding
+(forssen,kupries)
+2002-01-24 (HTTP server bug workaround)[504508] leave the default port out
+of the Host: header value
+=> http 2.4.1 (hobbs)
+2002-01-25 (new feature)[496733] socket options -eofchar and -translation
+return read-only values (dejong)
+2002-01-28 (new feature) Old ChangeLog entries => ChangeLog.20900 (hobbs)
+2002-01-28 (performance enhancement) bytecompiled [regexp] for trivial cases
+that amount to string matching.  Also -nocase and --. (hobbs)
+2002-02-05 (bug fix) [http::error] called when [::error] intended
+=> http 2.4.2 (porter)
+2002-02-05 (bug fix)[465765] avoid zero-byte writes to STREAMs
+(talcott,kupries)
+2002-02-06 (performance enhancement) [regsub] special cases that map to
+[string map] detected. (hobbs)
+2002-02-06 (bug fix)[495213] [scan] accept 0x as prefix of base 16 value
+(hobbs)
+2002-02-10 (new feature)[TIP 32,79] Tcl_CreateObjTrace API (kenny)
+2002-02-12 (new feature) partial support for DJGPP Tcl on DOS (gravereaux)
+2002-02-14 (mem leak) Fixed leaking an empty Tcl_Obj when [gets $chan]
+errored out. (kupries, sofer)
+2002-02-15 (new feature)[TIP 72] support for 64-bit integer values on
+32-bit platforms and ability to work with >2GiB files.  Extends many
+commands.  See ChangeLog and TIP for details.
+	*** POTENTIAL INCOMPATIBILITY ***
+2002-02-22 (bug fix)[476537] Fix panic when loading shared library without
+proper use of stubs on platform without backlinking (porter)
+2002-02-22 (new feature)  64-bit support for xlc compiler on AIX-4 (hobbs)
+2002-02-22 (new feature)[521560] Removed limits on filename length and
+format [source]able through the Safe Base (hobbs)
+2002-02-22 (performance enhancement) optimized bytecodes for [if], [for],
+[while] and constant conditions (sofer)
+2002-02-22 (new feature)[TIP 76] [regsub] can now return result (fellows)
+2002-02-25 (bug fix)[495207] buffer overrun when closing ] left out of
+argument to [subst] (sofer, english)
+2002-02-25 (bug fix)[514392] [load] updated for Mac OS X 10.1 (steffen)
+2002-02-26 (bug fix) [info hostname] choked on names >31 characters (hobbs)
+2002-02-26 (new feature)[TIP 35] serial channel configuration: Unix
+(schroedter, hobbs)
+2002-02-25 (bug fix)[483575] [fconfigure ... -error] now no-op on Mac (kupries)
+2002-02-28 (performance enhancement)[458872] fully qualified command names use
+cached Command for all namespaces, avoiding repeated lookups (sofer)
+* (new feature)[TIP 27] completed CONST-ification of TCL APIs.
+Added compiler macro USE_NON_CONST to keep using those old API prototypes
+that present irreconcilable source incompatibilities with header files
+of prior Tcl releases.  Others will need to be reconciled.
+*** POTENTIAL INCOMPATIBILITY ***
+2002-03-04 (bug fix)[474358, 218099, 219314, 524674] fixed several problems
+related to the handling of iso2022 text and finalization of escape-based
+encodings. (taguchi, takahashi, hobbs)
+--- Released 8.4a4, March 5, 2002 --- See ChangeLog for details ---
+2002-03-06 (new feature)[TIP 80] expanded [lsearch] options (wilkason, fellows)
+2002-03-07 (new feature)[TIP 87] [interp recursionlimit] (trier)
+2002-03-08 (platform feature) mingw 1.1 build favored (dejong)
+2002-03-20 (new feature)[TIP 27] CONST-ified variable access functions (porter)
+2002-03-24 (bug fix)[511666,511658,523217,530960] expanded
+Tcl_FSMatchInDirectory to handle assorted [glob] bugs in VFS. (darley)
+*** POTENTIAL INCOMPATIBILITY with prior 8.4a releases ***
+2002-03-25 (bug fix)[495726] stopped tcltest disabling of auto-loading (porter)
+2002-03-25 (bug fix)[495977] allow \n in test constraints (porter)
+2002-03-27 (platform support)[527941,533862] VC/winhelp/W9X (spjuth,
+gravereaux)
+2002-03-28 (bug fix)[219181] exception at level 0 issues (sofer)
+2002-03-28 (bug fix)[219362] command termination; Tcl_CreateTrace (knoll,sofer)
+2002-04-05 (bug fix)[536879] exceptions during variable subst (porter)
+2002-04-15 (bug fix)[497446,513983] tcltest syntax errors now raised (porter)
+	***POTENTIAL INCOMPATIBILITY with prior tcltest 2.0.* (8.4aX)***
+2002-04-17 (bug fix)[495660] [(save|restore)state] deprecated (porter)
+2002-04-17 (bug fix)[526524] escape-based encodings corrected (yamamoto, hobbs)
+2002-04-18 (bug fix)[542588] [expr] error msgs improved (ehrens, sofer)
+2002-04-18 (bug fix)[545325] [info level $level] now returns [namespace eval]
+as documented (suchenwirth,sofer)
+2002-04-19 (bug fix)[544727] export [mcload]; ns context of [mcmax] (porter)
+=> msgcat 1.2.3
+2002-04-22 (performance enhancement) threaded memory allocator (AOL, hobbs)
+2002-04-24 (new feature) TCLTK_NO_LIBRARY_TEXT_RESOURCES #define disables
+inclusion of tcl library code in resource fork on Mac.  (steffen)
+2002-05-21 (platform support) static libs on OSF (dejong)
+2002-05-24 (bug fix)[557878] set encoding on listening socket (staplin,
+kupries)
+2002-05-24 (new feature)[TIP 91] Tcl_Seek compatibility (fellows)
+2002-05-28 (bug fix)[545579] VFS [load] left temp file (darley)
+2002-05-28 (bug fix)[559376] plug timezone env leak on Windows (hobbs)
+2002-05-29 (performance enhancement) [string compare] optimized (hobbs,fellows)
+2002-05-31 (bug fix)[550534] plug interp leak in [pkg_mkIndex] (helmut)
+2002-05-31 (dead code)[474335,555635] removed all use of matherr() (english)
+*** POTENTIAL INCOMPATIBILITY ***
+2002-06-04 (new feature)[TIP 85,521362] custom result match in tcltest
+(markus, porter)
+=> tcltest 2.1
+2002-06-06 (bug fix)[524352] encoding, threading, and environment issues on
+MacOSX (steffen)
+2002-06-06 (bug fix)[512214,558742,512214,461000] lazy initialization of
+tcltest constraints (porter)
+2002-06-07 (bug fix)[563122,564595] EOVERFLOW definitions (fellows)
+2002-06-11 (bug fix)[567386] [info locals] corrections (sofer)
+2002-06-14 (new feature)[TIP 102] [trace list] renamed [trace info] (fellows)
+2002-06-17 (new feature)[525522,525525] msgcat support for XPG4 locales;
+examination of LC_ALL, LC_MESSAGES environment variables (haible, porter)
+=> msgcat 1.3
+2002-06-17 (new feature)[565088] header files assume modern C compiler by
+default; older compilers may need configuration (english)
+*** POTENTIAL INCOMPATIBILITY ***
+2002-06-17 (bug fix)[554068] [exec] argument quoting on Windows (darley)
+2002-06-17 (new feature)[TIP 62,462580] command execution traces (lavana)
+2002-06-19 (bug fix)[558324] regexp sets a linked variable (watson)
+* (performance enhancment) optimizations of bytecode execution (sofer)
+2002-06-21 (new feature)[TIP 99,562970] new [file link] command (darley)
+2002-06-24 (new feature)[TIP 101] new [tcltest::configure] command (porter)
+=> tcltest 2.2
+2002-06-25 (new feature) --enable-man-symlinks and --enable-man-compression
+options to configure (max)
+2002-06-26 (bug fix)[565880] [clock format] now respects locale (max)
+*** POTENTIAL INCOMPATIBILITY ***
+2002-07-03 (bug fix)[577015] [catch] catches even compile errors (sofer)
+--- Released 8.4b1, July 5, 2002 --- See ChangeLog for details ---
+2002-07-08 (bug fix) restored compatibility of [viewFile] in tcltest (porter)
+2002-07-11 (bug fix) [file normalize] returns long form on Win 95/98/ME (darley)
+2002-07-15 (performance enhancment) variable operations rewritten to store
+	and use cached Var pointers (sofer)
+2002-07-22 (bug fix)[218000] Inf and Nan are floating-point values (fellows)
+2002-07-23 (platform support)[219220] 64-bit compile on IRIX (dejong)
+2002-07-25 (bug fix)[219218] return codes in background errors (english)
+2002-07-28 (bug fix)[582522] alias fires exec traces (sofer)
+2002-07-29 (bug fix)[578363] regexp (fellows,pvgoran)
+2002-07-30 (bug fix)[584603] WriteChars infinite loop non-UTF-8 string (kupries)
+2002-08-04 (new feature)[584051,580433,585105,582429][TIP 27] Tcl interfaces
+	are now fully CONST-ified.  Use the symbols USE_NON_CONST or
+	USE_COMPAT_CONST to select interfaces with fewer changes.
+*** POTENTIAL INCOMPATIBILITY ***
+2002-08-05 (bug fix)[589859] tcltest setup and cleanup scripts skipped when
+	test body is skipped (porter)
+	=> tcltest 2.2
+2002-08-07 (bug fix)[587488] mem leak with USE_THREAD_ALLOC (sofer,sass)
+2002-08-07 (feature enhancement)[584794,584650,472576] boolean values
+	are no longer always re-parsed from string. (sofer)
+Many internal bugs fixed.
+Considerable cleanup of the test suite.
+--- Released 8.4b2, August 9, 2002 --- See ChangeLog for details ---
+2002-08-20 (new feature) --enable-memdebug configure option (kupries)
+2002-08-23 (bug fix)[597936] mem leak with USE_THREAD_ALLOC (sofer,zoran)
+2002-08-26 (bug fix)[599788] segfault in compiler (sofer,wilkason)
+2002-08-28 (bug fix)[414910] avoid mem leaks accessing environment variables
+	on Windows (welton,gravereaux)
+2002-08-31 (platform support)[TIP 108] Mac OS X port (steffen,ingham)
+2002-09-02 (platfrom support) 64-bit compile on HP-11 (martin)
+--- Released 8.4.0, September 10, 2002 --- See ChangeLog for details ---
+2002-09-18 (platform support) Updated support for compiling with Cygwin and
+either mingw or gcc. (khan, howell, dejong)
+2002-09-22 (bug fix)[612786, 611922] Corrected [puts -nonewline] within
+test bodies. Also corrected reporting of body return code.  Updated tcltest
+to v2.2.1.
+2002-09-24 (bug fix)[613117] More robust 64-bit wide integer value
+detection (fellows)
+2002-09-26 (bug fix) correct overeager optimization of noop proc to handle
+the precompiled case. (sofer, hobbs)
+2002-09-26 (bug fix)[615115] removed extraneous spaces in koi8-u.enc that
+confused encoding reader.
+2002-09-29 (bug fix)[219355] Added proper exiting conditions using Win32
+console signals.  This handles the existing lack of a Ctrl+C exit to call
+exit handlers when built for thread support.  Also, properly handles exits
+from other conditions such as CTRL_CLOSE_EVENT, CTRL_LOGOFF_EVENT, and
+CTRL_SHUTDOWN_EVENT signals.  In all cases, exit handlers will be called.
+(gravereaux)
+2002-09-30 (bug fix) improve the checking for bad regular expressions
+during regexp compilation.  Resultant compiles were correct, but much
+slower than necessary. (hobbs)
+2002-10-01 (bug fix) fix precompiled locals to support 8.3 precompiled
+code. (hobbs)
+2002-10-09 (bug fix)[620735] Added code to set an exit handler on Windows
+that terminates the thread that calibrates the performance counter, so that
+the thread won't outlive unloading the Tcl DLL. (kenny)
+2002-10-09 (build support) all --enable-symbols to take the enhanced
+options yes|no|mem|compile|all. (hobbs)
+2002-10-10 (build support) enable USE_THREAD_ALLOC (new threaded allocator)
+by default on Windows. (hobbs, gravereaux)
+2002-10-14 (bug fix)[623269] correct possible mem leak in
+Tcl_PutEnv. (brouwers)
+2002-10-15 (bug fix)[615043] fix in execution traces with idle tasks
+firing. (lavana)
+2002-10-15 (platform support) Correct AIX-5 ppc and 4/5 64-bit build flags.
+Correct HP 11 64-bit gcc building. (martin, hobbs)
+2002-10-17 (bug fix)[624755] Fixed code that check for proper # of args to
+[array names] (porter)
+2002-10-18 (feature enhancement)[625453] Added support for broadcasting
+changes to the registry Environment on Windows.  Updated registry package
+to v1.1. (hobbs)
+2002-10-22 (platform support)[624509] On macosx, add embedded framework
+dirs to tcl_pkgPath: @executable_path/../Frameworks and
+@executable_path/../PrivateFrameworks (if they exist), as well as the dirs
+in DYLD_FRAMEWORK_PATH (if set). (steffen)
+--- Released 8.4.1, October 22, 2002 --- See ChangeLog for details ---
+2002-10-28 (bug fix)[627660] [package unknown] chaining for platform specifics
+2002-10-29 (bug fix)[627546] verbose [load] (dyld) error mesages on MacOSX
+2002-11-01 (bug fix) [package provide registry] consistent versions.
+2002-11-06 (bug fix)[582039] missing ar program -> configuration error
+2002-11-06 (feature enhancement) added new TclInThreadExit function to
+test for thread exit vs whole process exit condition. The TclInExit
+function now correctly returns 1 during Tcl_Finalize processing.
+*** POTENTIAL INCOMPATIBILITY ***
+2002-11-13 (bug fix)[615043] some execution traces were not firing
+2002-11-18 (bug fix)[634856] multiple signs no longer accepted as valid integer
+[string is integer ++1] => 0
+*** POTENTIAL INCOMPATIBILITY ***
+2002-11-26 (bug fix)[593810,597924] clean exit of channel worker threads on Win
+2002-11-28 (new feature) `make valgrind` target
+2002-12-03 (bug fix)[615304] repeated load/unload of Tcl now possible
+2002-12-11 (bug fix)[647307] negative return codes now propagated by procs
+2002-12-11 (bug fix)[648441] syntax error in [expr 0x] now detected.
+2003-01-07 (bug fix)[633204] [catch {return}] => 2 (not 0)
+2003-01-09 (bug fix)[634151] [file (a|m)time $nonASCIIpath $time] now works
+2003-01-16 (bug fix) dde eval with {} service name does not crash.
+=> dde 1.2.1
+2003-01-16 (bug fix)[635200,655645,615043,571385] many command trace fixes
+2003-01-31 (bug fix)[675614,678415,676978] tcltest conflicts in cleanup
+and -outfile; also failure in space-containing path; also missing [close]
+=> tcltest 2.2.2
+2003-02-01 (bug fix)[670042] corrected [info loaded {}] for static
+packages in multiple interps.
+2003-02-01 (bug fix)[675356] [clock clicks {}]; [clock clicks -] - syntax errs
+2003-02-01 (bug fix)[656660] MT-safety for [clock format]
+2003-02-03 (bug fix)[651271] command rename traces get fully-qualified names
+*** POTENTIAL INCOMPATIBILITY ***
+2003-02-07 (performance improvement) [glob] on Windows is 2.5 times faster
+2003-02-07 (feature change) lack of Cygwin support indicated by config error
+2003-02-11 (bug fix)[684744] [info complete] stopped by \x00
+2003-02-11 (bug fix)[685445] [glob -types l] missed broken symlinks on Unix
+2003-02-11 (bug fix) [lsearch -regexp $a $a] doesn't crash
+2003-02-13 (bug fix)[685926] accept non-ASCII7 for tcl_platform(user) on Win
+2003-02-15 (bug fix)[673714] stop crash when Tcl_DeleteEvents deletes last
+2003-02-15 (bug fix)[681841] parser missed some missing ] syntax errors
+2003-02-17 (bug fix)[684756] memory leak during command rename plugged
+2003-02-18 (bug fix)[689100] reduced per-thread memory overhead
+2003-02-18 (platform support)[651811] use xnet library on HP 11 (64 bit).
+2003-02-20 (bug fix)[Patch 689341] correct jis round-trip encoding
+2003-02-20 (bug fix)[689835] stop MacOSX hang trying to read a write-only pipe
+2003-02-07 (performance improvement) [tclPkgUnknown]: fewer vfs calls
+2003-02-18 (platform support) cut and splice procs for file channels on Mac
+2003-02-21 (bug fix)[690774] [binary scan] failed on some wide ints
+2003-02-22 (bug fix)[571002] plugged data leak during thread exit
+2003-02-25 (feature change) [pkg_mkIndex -load]: case-insensitive match
+*** POTENTIAL INCOMPATIBILITY ***
+2003-02-27 (bug fix)[694232] stop [lsearch -start 0 {} x] segfault
+--- Released 8.4.2, March 3, 2003 --- See ChangeLog for details ---
+2003-03-06 (bug fix)[699042] Correct case-insensitive unicode string
+comparison in Tcl_UniCharNcasecmp
+2003-03-11 (bug fix) Corrected loading of tclpip8x.dll on Win9x
+2003-03-12 (bug fix)[702383] Corrected parsing of interp create --
+2003-03-12 (bug fix)[685106] Correct Tcl_SubstObj handling of \x00 bytes
+2003-03-14 (bug fix)[702622 699060] Correct wide int issues in 'format'
+2003-03-14 (bug fix)[698146] Remove assumption that file times and longs
+are the same size.
+2003-03-18 (bug fix)[697862] Allow Tcl to differentiate between reparse
+points which are symlinks and mounted drives on Windows
+2003-03-19 (bug fix)[705406] Bad command count on TCL_OUT_LINE_COMPILE
+2003-03-20 (bug fix)[707174] Store pointers to notifier funcs in a struct
+to work around some platform linker issues
+2003-03-22 (bug fix)[708218] Load correct (non-)debug dll for dde or
+registry
+2003-03-24 (bug fix)[631741 696893] Fixing ObjMakeUpvar's lookup algorithm
+for the created local variable
+2003-04-07 (bug fix)[713562] Make sure that tclWideIntType is defined and
+somewhat sensible everywhere
+2003-04-07 (bug fix)[711371] Corrected string limits of arguments
+interpolated in error messages for 'if'
+2003-04-11 (bug fix)[718878] Corrected inconsistent results of
+[string is integer] observed on systems where sizeof(long) != sizeof(int)
+2003-04-12 (bug fix) Substantial changes to the Windows clock synch
+phase-locked loop in a quest for improved loop stability
+2003-04-16 [713562] Made changes so that the "wideInt" Tcl_ObjType is
+defined on all platforms, even those where TCL_WIDE_INT_IS_LONG is defined.
+Also made the Tcl_Value struct have a wideValue field on all platforms.
+Potential incompatibility for TCL_WIDE_INT_IS_LONG platforms because that
+struct changes size.
+*** POTENTIAL INCOMPATIBILITY ***
+2003-04-25 (bug fix)[727271] Catch any errors returned by the Windows
+functions handling TLS ASAP instead of waiting to get some mysterious crash
+later on due to bogus pointers.
+2003-04-29 (bug fix) Correct 'glob -path {[tcl]} *', where leading
+special character instead lists files in '/'.  Bug only occurs on Windows
+where '\' is also a directory separator.
+2003-05-09 (bug fix)[731754] Fixed memory leak in threaded allocator on
+Windows caused by treating cachePtr as a TLS index
+2003-05-10 (bug fix)[710642] Ensure cd is thread-safe
+2003-05-10 (bug fix)[718002] Correct mem leak on closing a Windows serial
+port
+2003-05-10 (bug fix)[714106] Prevent string repeat crash when overflow
+sizes were given (throws error).
+2003-05-13 (feature enhancement)[736774] Use new versioned bundle resource
+API to get tcl runtime library for TCL_VERSION on Mac OS X.
+2003-05-13 (bug fix)[711232] Worked around the issue of realpath() not
+being thread-safe on Mac OS X by defining NO_REALPATH for threaded builds
+on Mac OS X.
+2003-05-14 (bug fix)[557030] Correct handling of the gb2312 encoding by
+making it an alias of the euc-cn encoding and creating a gb2312-raw
+encoding for the original.  Most uses of gb2312 really mean euc-cn.
+2003-05-14 (bug fix)[736421] Corrected another putenv() copy behavior
+problem when compiling on Windows and using Microsoft's runtime.
+--- Released 8.4.3, May 20, 2003 --- See ChangeLog for details ---
+2003-05-23 (bug fix)[726018] reverted internals change to the
+'cmdName' Tcl_ObjType that broke several extensions (TclBlend, e4graph...)
+in the 8.4.3 release.
+2003-06-10 (bug fix)[495830] stop eval of bytecode in deleted interp.
+2003-06-17 (bug fix) corrections to regexp when matching emtpy string.
+2003-06-25 (bug fix)[748957] -*ieee compiler flags for Tru64 builds.
+2003-07-11 (bug fix) [pkg_mkIndex] indexes provided packages, not indexed ones.
+2003-07-15 (feature enhancement) MacOSX build system rewrite.
+2003-07-15 (bug fix)[771613] corrected segfault in [if] (buffer overflow)
+2003-07-16 (bug fix)[756791] corrected assumption that Tcl_Free == free
+2003-07-16 (feature enhancement) -DTCL_UTF_MAX=6 compile option forces
+internal UCS-4 representation of Unicode (default is recommended UCS-2).
+2003-07-16 (bug fix)[767578] 64-bit corrections in thread notifier.
+2003-07-16 (bug fix)[759607] Safe Base tests normalized paths.
+2003-07-16 (feature enhancement)[Patch 679315] improved Cygwin path support
+2003-07-18 (bug fix)[706359] corrected broken -output option of [tcltest::test]
+=> tcltest 2.4.4
+2003-07-18 (bug fix)[753315] MT-safety of VFS records.
+2003-07-18 (bug fix)[759888] support for user:pass in URL by [http::geturl]
+=> http 2.4.4
+Improved documentation, new tests, and some code cleanup.
+[655300, 720634, 735364, 748700, 756112, 756744, 756951, 758488, 760768,
+763312, 769895, 771539, 771840, 771947, 771949, 772333]
+--- Released 8.4.4, July 22, 2003 --- See ChangeLog for details ---
+2003-07-23 (bug fix)[775976] fix registry compilation for VC7.
+2003-08-05 (enhancement)[781585] Use Tcl_ResetResult in bytecodes to
+prevent potential costly Tcl_Obj duplication.
+2003-08-06 (bug fix)[781609] prevent non-Windows platforms from trying to
+use the registry package inside msgcat.
+2003-08-27 (bug fix)[411825] Fix TclNeedSpace to handle non-breaking space
+(\u00A0) and backslash escapes correctly.
+2003-09-01 (bug fix)[788780] Fix thread-safety issues in filesystem records.
+2003-09-19 (bug fix)[804681] Protect ::errorInfo and ::errorCode traces
+from corrupting stack.
+2003-09-23 (bug fix)[218871] Fix handling of glob-sensitive chars in
+auto_load and auto_import.
+2003-10-03 (bug fix)[811483] Fixed refcount management for command and
+execution traces.
+2003-10-04 (bug fix)[789040] Fixed exec command.com error for Win9x.
+2003-10-06 (bug fix)[767834, 813273] Fixed volumerelative file
+normalization and 'file join' inconsistencies.
+2003-10-08 (bug fix)[769812] Fix Tcl_NumUtfChars string length calculation
+when negative parameter is given.
+2003-10-22 (bug fix)[800106] Handle VFS mountpoints inside glob'd dirs.
+2003-10-22 (bug fix)[599468] Watch for FD_CLOSE too on Windows when
+asked for writable events by the generic layer.
+2003-10-23 (bug fix)[813606] Detect OS X pipes correctly.
+2003-11-05 (bug fix)[832657] Allow .. in libpath initialization.
+2003-11-11 (bug fix) Improve AIX-64 build configuration.
+2003-11-17 (bug fix)[230589, 504785, 505048, 703709, 840258] fixes to
+various odd regexp "can't happen" bugs.
+--- Released 8.4.5, November 20, 2003 --- See ChangeLog for details ---
+2003-12-02 (bug fix)[851747] object sharing fix in [binary scan]
+2003-12-09 (platform support)[852369] update errno usage for recent glibc
+2003-12-12 (bug fix)[858937] fix for [file normalize ~nobody]
+2003-12-17 (bug fix)[839519] fixed two memory leaks (vasiljevic)
+2004-01-09 (bug fix)[873311] fixed infinite loop in TclFinalizeFilesystem
+2004-02-02 (bug fix)[405995] Tcl_Ungets buffer filling fix
+2004-02-04 (bug fix)[833910] tcltest command line option parsing error
+=> tcltest 2.4.5
+2004-02-04 (bug fix)[833637] code error in tcltest -preservecore operation
+2004-02-12 (feature enhancement) update HP-11 build libs setup
+2004-02-17 (bug fix)[849514,859251] corrected [file normailze] of $link/..
+2004-02-17 (bug fix)[772288] Unix std channels forced to exist at startup.
+2004-02-17 (new default) tcltest::configure -verbose {body error}
+2004-02-19 (bug fix) init.tcl search path with unusual --libdir (samson)
+2004-02-25 (bug fix)[554068] stopped broken [exec] quoting of { (gravereaux)
+2004-02-25 (bug fix)[888777] plugged memory leak with long host names (cassoff)
+2004-03-01 (bug fix)[462580] corrected level interpretation of Tcl_CreateTrace
+2004-03-01 (platform support)[218561] Allow 64-bit configure on IRIX64-6.5*
+--- Released 8.4.6, March 1, 2004 --- See ChangeLog for details ---
+2004-03-08 (bug fix)[910525] [glob -path] in root directory (darley)
+2004-03-15 (bug fix)[916795] syntax error -> compiler segfault (sofer,porter)
+2004-03-29 (bug fix)[920667] install into any Unicode path on Win (hobbs)
+2004-03-31 (bug fix)[811457] support translation to "" (porter)
+2004-03-31 (bug fix)[811461] ignore locales with no "language" part (porter)
+=> msgcat 1.3.2
+2004-04-07 (platform support) properly substitute more values in Windows
+tclConfig.sh (hobbs)
+2004-04-23 (bug fix)[930851] reset channel EOF when eofchar changes (kupries)
+2004-05-03 (bug fix)[947070] stack overflow prevention on Win (kenny)
+2004-05-03 (bug fix)[868853] fix leak in [fconfigure $serial -xchar] (cassoff)
+2004-04-05 (bug fix)[928353,929892,928808,947440,948177] test fixes: OSX
+(abner)
+2004-05-04 (bug fix) crash: [cd] w/ volumerelative $HOME (hobbs)
+2004-05-05 (bug fix)[794839] socket connect error -> r/w fileevents
+(gravereaux)
+2004-05-14 (bug fix)[940278,922848] [clock] notices $::env(TZ) changes,
+gmt works on all platforms. (kenny, welton, glessner)
+2004-05-18 (bug fix)[500285,500389,852944] [clock %G %V] ISO8601 week numbers
+(kenny)
+2004-05-22 (bug fix)[735335,736729] variable name resolution error (sofer)
+2004-05-24 (bug fix) support for non-WIDE_INT aware math functions (hobbs)
+2004-05-25 (new feature) [http::config -urlencoding] (hobbs)
+=> http 2.5.0
+2004-05-26 (bug fix)[960926] file count doubled when -singleproc 1 (porter)
+=> tcltest 2.2.6
+2004-05-27 (bug fix)[949905] corrected utf-8 encoding of \u0000 on I/O (max)
+2004-06-05 (bug fix)[976722] hi-res clock fixes: Win
+(godfrey, suchenwirth, kenny)
+2004-06-10 (bug fix)[932314] bad return values from Tcl_FSChdir() (vasiljevic)
+2004-06-14 (bug fix) correct dde hangs w/non-responsive apps (thoyts)
+=> dde 1.2.3
+2004-06-21 (platform support) exceptions w/ gcc -O3 on Win (dejong)
+2004-06-29 (bug fix)[981733] SafeBase global pollution (fellows)
+2004-07-02 (new feature)[TIP 202] pipe redirection 2>@1 (hobbs)
+2004-07-03 (bug fix)[908375] round() wide integer support (lavana, sofer)
+2004-07-15 (bug fix)[770053] crash in thread finalize of notifier (vasiljevic)
+2004-07-15 (bug fix)[990453] plug mutex leaks on reinit
+(mistachkin, vasiljevic)
+2004-07-16 (bug fix)[990500] clean exit of notifier thread
+(mistachkin, kupries)
+2004-07-19 (bug fix)[987967] improved self-init of mutexes on Win (vasiljevic)
+2004-07-19 (bug fix)[874058] improved build configuration on 64-bit systems.
+Corrects Tcl_StatBuf definition issues.  (hobbs)
+2004-07-20 (bug fix) pure Darwin/CFLite support (steffen)
+2004-07-20 (bug fix)[736426] plug leaky allocator reinit (mistachkin, kenny)
+--- Released 8.4.7, July 26, 2004 --- See ChangeLog for details ---
+2004-07-28 (bug fix)[999084] no deadlock in re-entrant Tcl_Finalize (porter)
+2004-08-10 (bug fix) thread IDs on 64-bit systems (ratcliff,vasiljevic)
+2004-08-13 (bug fix) avoid malicious code acceptance by [mclocale] (porter)
+=> msgcat 1.3.3
+2004-08-16 (bug fix)[1008314] Tcl_SetVar TCL_LIST_ELEMENT (sofer,porter)
+2004-08-19 (bug fix)[1011860] [scan %ld] fix on LP64 (fellows,porter)
+2004-08-30 (bug fix) [string map $x $x] crash (fellows)
+2004-09-01 (bug fix)[1020445] WIN64 support (hobbs)
+2004-09-07 (bug fix)[1016167] [after] overwrites its imports (kenny)
+2004-09-08 (bug fix) fixed [clock format 0 -format %k] (kenny)
+2004-09-09 (bug fix)[560297] fixed broken [namespace forget] logic (porter)
+2004-09-09 (bug fix)[1017299] fixed [namespace import] cycle prevention (porter)
+2004-09-10 (performance) $x[set x {}] is now fast [K $x [set x {}]] (sofer)
+2004-09-10 (bug fix)[868489] better control over int <-> wideInt (fellows,kenny)
+2004-09-10 (bug fix)[1025359] POSIX errorCode from wide seeks (kupries,fellows)
+2004-09-18 (bug fix)[868467] fix [expr 5>>32] => 0, not 5 (hintermayer,fellows)
+2004-09-23 (bug fix)[1016726] fix `make clean` in static config (leitgeb,dejong)
+2004-09-29 (bug fix)[1036649] syntax error in [subst] => buffer overflow (sofer)
+2004-09-30 (bug fix)[1038021] save/restore error state: var traces (porter)
+2004-10-08 (bug fix)[954263] case insensitive [file exec] for Win (hobbs,darley)
+2004-10-14 (performance) [info commands/globals/procs/vars $pattern] faster
+		when $pattern is trivial (fellows)
+2004-10-28 (bug fix)[1030548] restore the --enable-symbols --enable-threads
+		build on Win (mistachkin,kenny,kupries)
+2004-10-29 (bug fix)[1055673] fix command line syntax error message (porter)
+=> tcltest 2.2.7
+2004-10-31 (bug fix)[1057461] fix [info globals ::varName] (fellows)
+2004-11-02 (bug fix)[761471] fix [expr {NaN == NaN}] (sofer)
+2004-11-02 (bug fix)[1017151] misleading errorInfo after tests (seeger,porter)
+2004-11-11 (bug fix)[1034337] recursive file delete, MacOSX (steffen)
+2004-11-12 (bug fix)[1004065] stop crash when TCL_UTF_MAX==6 (hobbs,porter)
+2004-11-15 (bug fix)[10653678] [trace variable],[trace remove] interop (porter)
+2004-11-16 (bug fix)[695441] [tcl_findLibrary] search $::auto_path too (porter)
+2004-11-16 (bug fix)[1067709] crash in [fconfigure -ttycontrol] (hobbs)
+2004-11-18 (new feature) configure options --enable-man-suffix (max)
+Documentation improvements [759545,1058446,1062647,1065732,etc.]
+Test suite expansion [1036649,1001997,etc.]
+--- Released 8.4.8, November 18, 2004 --- See ChangeLog for details ---
+2004-11-22 (bug fix)[1030465] Improve HAVE_TYPE_OFF64_T check (dejong)
+2004-11-23 (bug fix)[1072654] Fixed segfault in info vars trivial
+matching branch (new in 8.4.8) (porter)
+2004-11-23 (bug fix)[1043129] Fixed the treatment of backslashes in file
+join on Windows (darley)
+2004-11-24 (bug fix)[1001325, 1071701] Fixed readdir_r detection and usage
+(dejong, kenny, porter)
+2004-11-24 (bug fix)[1071807] Fixed all uses of 'select' to use standard
+macros rather than older bit-whacking style (kenny)
+2004-11-26 (bug fix)[1072136] Remove file normalize on tcl_findLibrary
+search path uniqification added in 8.4.8 (porter)
+2004-12-02 (bug fix)[1074671] Ensure tilde paths are not returned specially
+by 'glob' (darley)
+--- Released 8.4.9, December 6, 2004 --- See ChangeLog for details ---
+2004-12-29 (platform support)[1092952,1091967] MSVC7, gcc OPT compiles (hobbs)
+2005-01-05 (bug fix)[1084595] encoding maps for some Chinese locales (fellows)
+2005-01-06 (performance)[1020491] [http::mapReply] (fellows)
+=> http 2.5.1
+2005-01-25 (bug fix)[1101670] [auto_reset] update for [namespace] (porter)
+2005-01-27 (new feature)[TIP 218] Tcl_Channel API update for threads (kupries)
+2005-01-27 (bug fix)[1109484] Tcl_Expr* updates for Tcl_WideInt (hobbs)
+2005-01-28 (platform support)[1021871] Solaris gcc 64-bit support (hobbs)
+2005-02-10 (bug fix)[1119369] Tcl_EvalObjEx: avoid shimmer loss of List intrep
+(sofer,macdonald)
+2005-02-10 (platform support) correct gcc builds for AIX-4+, HP-UX-11 (hobbs)
+2005-02-24 (bug fix)[1119798] prevent [source $directory] (porter,mpettigr)
+=> tcltest 2.2.8
+2005-03-10 (bug fix)[1153871] bad ClientData cast (porter,victorovich)
+2005-03-15 (platform support) OpenBSD ports patch (thoyts)
+2005-03-15 (platform support)[1163422] time_t wider than long (kenny)
+2005-03-18 (bug fix)[1115904] restore recursion limit in direct eval (porter)
+2005-03-29 (platform support) allow msys builds without cygwin (hobbs)
+2005-04-06 (bug fix)[1178445] fix memory waste at thread exit (vasiljevic)
+2005-04-13 (bug fix) min buffer size dropped from 10 to 1 byte (gravereaux)
+2005-04-19 (bug fix)[947693] Windows pipes honor -blocking during close
+(gravereaux)  ***POTENTIAL INCOMPATIBILITY***
+async pipes on windows, set -blocking 1 before [close] to receive exit status
+2005-04-20 (bug fix)[1090869] Tcl_GetInt accept 0x80000000, 64-bit
+(porter,singh)
+2005-04-22 (bug fix)[1187123] [string is boolean] respect EIAS (porter)
+2005-04-25 (platform support) builds on Mac OS X 10.1 (steffen)
+2005-05-06 (platform support) x86_64 Solarix cc and Solaris 10 builds (hobbs)
+2005-05-14 (platform support) Mac OSX: configurable CoreFoundation API
+(steffen)
+2005-05-14 (platform support) Mac OSX: use realpath when threadsafe (steffen)
+2005-05-20 (bug fix)[1201589] boolean literal prefix in expressions (porter)
+2005-05-24 (platform support) Darwin build support merged into unix (steffen)
+2005-05-24 (new feature)[1202209] Mac OSX: support [load] of .bundle binaries
+Can support [load] from memory as well (steffen)
+2005-05-24 (new feature)[1202178] [time] returns non-integer result (steffen)
+2005-05-31 (bug fix)[1082283] Unix: notifier thread now joinable (vasiljevic)
+Documentation improvements [1075433,1085127,1117017,1124160,1149605,etc.]
+--- Released 8.4.10, June 4, 2005 --- See ChangeLog for details ---
+2005-06-06 (bug fix)[1213678] Windows/gcc: crash in stack.test (kenny)
+2005-06-07 (bug fix) Unix: --enable-threads compile failure (fellows)
+2005-06-18 (bug fix)[1154163] [format %h] on 64-bit OS's (kraft,fellows)
+2005-06-21 (bug fix)[1201035,1224585] execution trace crashes (porter)
+2005-06-21 (bug fix)[1194458] Windows: [file split] (kenny,porter)
+2005-06-22 (bug fix)[1225727] Windows: pipe finalization crash (kenny)
+2005-06-22 (bug fix)[1225571] Windows: [file pathtype] buffer overflow (thoyts)
+2005-06-22 (bug fix)[1225044] Windows: UMR in pipe close (kenny)
+2005-06-23 (bug fix)[1225957] Windows/gcc: crashes in assembler code (kenny)
+2005-06-27 (revert)[1101670] [auto_reset] disabled in non-global namespace.
+Restores Tcl 8.4.9 behavior (porter)
+--- Released 8.4.11, June 28, 2005 --- See ChangeLog for details ---
+2005-07-01 (bug fix)[1222872] notifier spurious wake-up protection (vasiljevic)
+2005-07-05 (bug fix)[1077262] improved Tcl_Encoding lifetimes (porter)
+2005-07-05 (bug fix)[1230597] allow idempotent [namespace import] (porter)
+2005-07-07 (bug fix)[1095909] readdir_r usage purged (hobbs)
+2005-07-22 (enhancement)[1237755] 8.4 features in script library (fradin,porter)
+2005-07-24 (new feature) configure macros SC_PROG_TCLSH, SC_BUILD_TCLSH (dejong)
+2005-07-26 (bug fix)[1047286] cmd delete traces during namespace delete (porter)
+2005-07-26 (new unix feature)[1231015] ${prefix}/share on ::tcl_pkgPath (dejong)
+2005-07-28 (unix bug fix)[1245953] O_APPEND for >> redirection (fellows)
+2005-07-29 (bug fix)[1247135] [info globals] return only existing vars (fellows)
+2005-07-30 (new Darwin feature) TCL_LOAD_FROM_MEMORY configuration (steffen)
+2005-08-05 (bug fix)[1241572] correct [expr abs($LONG_MIN)] (kenny)
+2005-08-05 (Solaris bug fix)[1252475] recognize cp1251 encoding (wagner,fellows)
+2005-08-17 (bug fix)[1217375] [file mkdir] race (diekhans,darley)
+2005-08-25 (bug fix)[1267380] [lrepeat] buffer overflow prevention (fellows)
+2005-08-29 (bug fix)[1275043] restore round() away from zero (kenny)
+2005-09-07 (bug fix)[1283976] invalid [format %c -1] result (porter)
+2005-09-15 (RHEL bug fix)[1287638] support open >2GB files RHEL 3 (palan)
+2005-09-30 (bug fix)[1306162] $argv encoding and list formatting (porter)
+2005-10-04 (bug fix)[1067708] [fconfigure -ttycontrol] leak (hobbs)
+2005-10-04 (bug fix)[1182373] [http::mapReply] update to RFC 3986 (aho,hobbs)
+=> http 2.5.2
+2005-10-04 (HPUX bug fix)[1204237] shl_load() and DYNAMIC_PATH (collins,hobbs)
+2005-10-05 (bug fix)[979640] buffer overrun mixing putenv(), ::env (bold,hobbs)
+2005-10-13 (bug fix)[1284178] [format] accept all integer values (porter)
+2005-10-22 (bug fix)[1251791] optimization exposed wide/int difference(sofer)
+2005-10-23 (bug fix)[1334947] value refcount error in var setting (sofer)
+2005-11-01 (bug fix)[1337941] Tcl_TraceCommand() -> crash (devilliers,porter)
+2005-11-03 (new Win NT/XP feature) Unicode console support (kovalenko,thoyts)
+2005-11-03 (bug fix)[1201171] [encoding system] in Tclkit (schekin,porter)
+2005-11-04 (bug fix)[1337229,1338280] [namespace delete] / unset traces (porter)
+2005-11-04 (enhancement) Korean timezone abbreviations (kenny)
+2005-11-04 (bug fix)[1317477] double encoding of time zone (kenny)
+2005-11-04 (Win enhancement)[1267871] extended exit codes (newman,thoyts)
+2005-11-04 (platform support)[1163896] LynxOS [load] (heidibr)
+2005-11-08 (bug fix)[1348775] unset trace memory leak (sofer)
+2005-11-08 (bug fix)[1162286] [package ifneeded] warns reported (lavana,porter)
+*** POTENTIAL INCOMPATIBILITY ***
+2005-11-09 (bug fix)[1350293] [after $negative $script] fixed (kenny)
+2005-11-15 (Win bug fix)[926016,1353840] correct [file mtime] (kenny)
+2005-11-18 (bug fix)[1358369] URL parsing standards compliance (wu,fellows)
+2005-11-18 (bug fix)[1359094] Tclkit crash (thoyts, kupries)
+2005-11-18 (bug fix)[1355942,1355342] cmd delete trace/ namespace delete (sofer)
+2005-11-20 (bug fix)[1091431] Tcl_InitStubs failure crashes wish (english)
+2005-11-29 (bug fix)[1366683] [lsearch -regexp] backrefs (cleverly,fellows)
+2005-11-29 (enhancement)[1369597] Win 64: --enable-64bit=amd64|ia64 (hobbs)
+2005-12-05 (Darwin bug fix)[1034337] NFS recursive file delete (steffen)
+--- Released 8.4.12, December 3, 2005 --- See ChangeLog for details ---
+2005-12-09 (bug fix)[1374778] [lsearch -start $pastEnd] => -1 (fellows)
+2005-12-12 (bug fix)[1241572] correct [expr abs($LONG_MIN)] again (max)
+2005-12-12 (bug fix)[1377619] configure syntax error exposed in bash-3.1 (hobbs)
+2006-01-09 (bug fix)[1400572] [info level $l] => "namespace inscope" (porter)
+2006-01-23 (bug fix)[1410553] Tcl_GetRange Unicode confusion (twylite,spjuth)
+2006-03-06 (bug fix)[1439836,1444291] fix TCL_EVAL_{GLOBAL,INVOKE} handling
+when auto-loading or exec traces are present (porter)
+2006-03-10 (bug fix)[1437595] Win socket finalize with threads (vasiljevic)
+2005-03-13 (revert 2005-07-26 change) ${prefix}/share on ::tcl_pkgPath (porter)
+2006-03-14 (bug fix)[1381436,859820] threadsafe Tcl_WaitPid (gravereaux,kupries)
+2006-03-14 (bug fix)[768659] pipeline error when last command missing (kupries)
+2006-03-18 (bug fix)[1193497] Win porting of [file writable] (darley,vogel)
+2006-03-28 (bug fix)[1064247] BSD: path normalization with realpath() (steffen)
+2006-03-28 (revert 2005-11-03 feature) Unicode console support (hobbs)
+*** POTENTIAL INCOMPATIBILITY ***
+2006-04-03 (bug fix)[1462248] crash reading utf-8 chars spanning multiple
+buffers at end of file (kraft,kupries)
+2006-04-04 (revert 2005-11-08)[1162286] [package ifneeded] warns (porter)
+*** POTENTIAL INCOMPATIBILITY ***
+2006-04-05 (bug fix)[1464039] Tcl_GetIndexFromObj: empty key (fellows)
+2006-04-05 (bug fix) overdue dde, registry  patchelevel increments (porter)
+=> dde 1.2.4
+=> registry 1.1.4
+2006-04-06 (bug fix)[1457515] TCL_IO_TRACK_OS_FOR_DRIVER_WITH_BAD_BLOCKING
+removed (steffen)
+2006-04-11 (bug fix)[1458266] enter/enterstep trace interference (leunissen)
+--- Released 8.4.13, April 19, 2006 --- See ChangeLog for details ---
+2006-05-04 (bug fix)[1480509] srand() accept wide input (porter,afredd)
+2006-05-05 (bug fix)[1481986] interactive Tcl_Main blocks main loop (porter,lin)
+2006-05-13 (bug fix)[1482718] proc re-compile: preserve the previous
+bytecode while references still on the stack (porter,ryazanov)
+2006-05-13 (bug fix)[943995] fixed [glob] on VFS (porter)
+2006-05-27 (bug fix)[923072] Darwin: made unthreaded CoreFoundation notifier
+naked-fork safe on Tiger (steffen)
+2006-05-31 (revert 2006-01-09)[1400572] namespace inscope & info level (porter)
+*** POTENTIAL INCOMPATIBILITY ***
+2006-06-14 (platform support)[1424909] MS VS2005 support (thoyts)
+2006-07-20 (platform support) Mac OS X weak linking (steffen)
+2006-07-20 (bug fix) Darwin: execve() works iff event loop not yet run (steffen)
+2006-08-18 (bug fix) intermittent failures in TclUnixWaitForFile() (steffen)
+2006-08-18 (platform support) Darwin x86_64 (steffen)
+2006-08-21 (bug fix)[1457797] Darwin 64-bit notifier hang (steffen)
+2006-08-21 (bug fix) Darwin: recursively called event loop (steffen)
+2006-08-30 (bug fix)[1548263] filesystem segfaults (hobbs,mccormack)
+2006-09-06 (bug fix)[999544] use of MT-safe system calls (vasiljevic)
+2006-09-10 (platform support) Darwin: msgcat use CFLocale (steffen)
+=> msgcat 1.3.4
+2006-09-22 (bug fix)[1562528] NULL terminates variadic calls (fellows,ryazanov)
+2006-09-26 (platform support) MSVC8 AMD64 support (thoyts)
+2006-10-05 (bug fix)[1570718] make [lappend $nonList] complain (sofer,virden)
+2006-10-05 (bug fix)[1122671] alignment fixes in unicode encoding routines
+(hobbs,staplin)
+2006-10-05 (new feature) [set ::http::strict 1] (default value is 0) to enable
+URL validity checking against RFC 2986 (hobbs)
+=> http 2.5.3
+--- Released 8.4.14, October 19, 2006 --- See ChangeLog for details ---
+2006-10-31 (platform support)[1582769] Fix build with VC2003 (thoyts)
+2006-11-07 (bug fix)[1586470] [file copy] on afs (kupries,dionizio)
+2006-11-26 (platform support)[1230558] --enable-64bit on more systems (steffen)
+2006-11-27 (bug fix)[1602208] use > 32 async sockets on 64bit system (fontaine)
+2007-01-25 (configure change) ensure CPPFLAGS env var used when set (steffen)
+2007-01-30 (enhancement) new target: `install-private-headers` (hobbs, steffen)
+2007-02-12 (bug fix)[1516109] escape encodings crossing chan buffers (dejong)
+2007-03-01 (bug fix)[1671138] compiled [foreach {} x {}] hangs (fellows)
+2007-03-10 (bug fix)[1675116] list shimmer crash in [lsort] (fellows)
+2007-03-13 (bug fix)[1671087] list shimmer crash in [foreach] (porter)
+2007-03-13 (bug fix)[1669489] list shimmer crash in [array set] (porter)
+2007-03-17 (bug fix)[1682211] buffer overflow in [registry keys] (kenny)
+=> registry 1.1.5
+2007-04-29 (bug fix) fts_open() crash on 64bit Darwin 8 or earlier (steffen)
+--- Released 8.4.15, May 25, 2007 --- See ChangeLog for details ---