The following fix was made in 4.0 since 4.0 Release Candidate :

	* _threads.h/_config.h : for all platforms, static mutexes made non-indirect

	* _iterator_base.h : made possible to choose between iterator_traits approach

	  and old-style iterator queries like iterator_category(), value_type(), etc. 

	  (Thanks to John R. Bandela for pointing this out)

	* _config.h, stl_user_config.h : introduced __STL_OLD_HP_ITERATOR_QUERIES switch to

	  allow old-style and new-style iterator queries (for all compilers). 

	  iterator_traits<> made always defined. 

	* _ptr_specialize.h - specializations of type_traits<> for compilers w/o partial spec

	  moved into separate file. Added iterator_traits<> specializations for pointer types

	  for __STL_NO_OLD_HP_ITERATOR_QUERIES case. Macro __STL_POINTERS_SPECIALIZE is now available

	  to specialize both type_traits and iterator_traits for a pointer to user-defined 

	  type (latter for standard-style iterator queries mode only)

	* vc5.mak : __STL_NO_FORCE_INSTANTIATE flag restored

	* _site_config.h : if __STL_NO_NEW_IOSTREAMS or __STL_NO_IOSTREAMS specified, 

	 SGI iostreams are being turned off. __STL_NO_SGI_IOSTREAMS moved into stl_user_config.h

	(Thanks to Sathish T C for the report)

	* stl_watcom.h : _REENTRANT is being set if _MT is set (thanks to Ricardo E. Gayoso for the input)

The following fix was made in 4.0 Release Candidate :

	* _threads.h, _alloc.c : fixed use of _STL_mutex_base instead of _STL_STATIC_MUTEX macro 

The following changes were made in 4.0 Release Candidate since 4.0 beta 8:

	* fstream.cpp : WIN32 fstreambuf::open flag mapping fixed

	  (thanks to Alberto Barbati for the reports)

	* ctype.cpp : fixed classic table regarding ios_base::print/ios_base::space

	  conflict (thanks to Alberto Barbati for the report)

	* cmath : added same workaround for SUN's math exception/std::exception name clash

	  as was there in math.h before

	* _streambuf.c : added "typename" to out-of-line functions (thanks to Michael Tsirkin for the report)

	* README fixed to be consistent about SGI iostreams setting (thanks to Ed Brey for the report)

	* _bitset.h : fixed SUN CC 4.2 crash with -g option (thanks to Alex Vanic for the report),

	  fixed bug in bitset<>::reference base bitset typedef

	* _threads.h/.c  - fixed issue with inconsistent system's macro for initialization

	  and warning about partially bracketed initializer

	* debug/_vector.h : fixed _Vector_nonconst_traits specialization for bit_vector

	  (thanks for Dave Abrahams for the fix & reminder)

	* config/msvc.h - addidional level 4 warnings suppressed (thanks to Ed Brey for the report) 

	* _ios.h : fixed DLL export decl for MSVC (thanks to Alberto Barbati for the report)

	* stdio_streambuf.cpp : compatibility fix for glibc 2.2 (thanks to Bill Shanahan for the patch)

	* _iterator_base.h : added iterator<output_iterator_tag, void,..> specialization;

	  _stream_iterator.h : ostream_iterator changed to inherit from iterator<>

	 (thanks to Raphael Bossek for the report)

	* INSTALL : added some exaples and fixed typos (thanks to Beman Dawes for the report)

	* _site_config.h : more consistency checks for MT (thanks to John Maddock for the input)

	* _messages_facets.h : added DLL export decls (thanks to John Maddock for the report)

	* complex_io_w.cpp : fixed specialization syntax for aCC (thanks to Paul E. Blanchard for the report)

	* complex_exp.cpp : fixed pow() bug for negative arguments (thanks to Anton Sergeev for the report)

	* _fstream.h/_streambuf.h : MRC/MPW workarounds (thanks for Tsutomu Yoshida for the report)

	* using/fstream.h : added missing end-of-line (thanks to Jean-Francois Panisset for the report)

	* <typeinfo> : workaround for VC++ 6.0 defining type_info in gobal namespace (thanks to Bosko Ivanisevic for pointing that out)

	* _threads.h/_threads.c/pthread_alloc : improved pthreads portability (thatnks to Michael Tsirkin for the patch) 

	* _debug.h/_debug.c : __STL_ASSERT/__STL_VERBOSE_ASSERT/__STL_VERBOSE_RETUN macros guarded to be overridable by user (thanks to Tony Gould for the input)

	* _valarray.h : added assert to operator= 

	* config/vc_select_lib.h : added _AFXDLL recognition (thanks to Andrew Phipps for input)

	* _rope.h : added default constructors to please gcc-2.7.2

	* _set.h/_hash_set.h : pointer and reference typedefs fixed (thanks to Anton Sergeev for the report)

	* stl/_config.h : stl_user config.h included prior to other parts of configuration

	(thanks to Frank Samuel for the report)

The following changes were made in 4.0 beta 8 since 4.0 beta 7:

	* Merged changes for 06/08 SGI library snapshot; mostly in locale

	* Merged series of fixes/workarounds by Tsutomu Yoshida (thanks!):

	*   _rope.c - fixed memory leak bug;	

	*   _debug.c/_debug.h - added extra zero-initialization for more robustness;

	*   _list.h - MPW - specific fixes;

	*   _hashtable.h - fixed debug renaming clash for __STL_USE_ABBREVS 

	*   EH workarounds to make Apple compilers behave

	* _fstream.c : fixed tellg() bug in text mode

	* <csignal> : added sig_atomic_t import

	* series of fixes for HP aCC 1.23 ( thanks to Michael Tsirkin for the patch ):

	  _bvector.h : all relops are specialized;

	  stl_hpacc.h - fixed config;

	  hpacc.mak : added makefiles for HP aCC in src and test

	  debug/_iterator.h, debug/_vector.h - removed future errors due to baseclass member use 

	* <cstdlib> : added import of system() call (thanks to Petr Ovchenkov for the report) 

	* _REENTRANT is now set by default to be on for all SGI iostreams compilations.

	  Same is being enforced if SGI iostreams are used.

	* _pair.h : added workaround for make_pair in case of char literals 

	  (extension, only works with partial function order)

	* config/stl_gcc.h - fixed configuration problem for "g++-3" directory used in Cygnus and Mingw 

	  distributions for gcc-2.95.2, while all other platforms use "g++". Added recognition section.

	  Thanks to Dave Abrahams for the report.

	* config/stl_mlc.h : added support for MLC compiler (thanks to Anton Sergeev for the patch)

	* <memory> : auto_ptr simplified (thanks to Kon Tantos for problem report)

	* num_get.cpp : included <ostream> to get external symbols right. 

	* stl_ibm.h : __STL_NO_TYPEINFO added for OS/2 (thanks to Willie Arbuckle for the report)

	* stl_bc.h  : fixed enforcement of static library until dynamic made to work (thanks to J. Lambert for the report) 

	* src/stlport.rc : improved version definition to work with mingw32, <winres.h> changed to <windows.h>

	* src/mingw32.mak : Made use of stlport.rc for DLL build (thanks to Danny Smith for the suggestion)

	* debug/_vector.h : name clash removed for _Base (thanks to Will Fike for the report)

	* _monetary.h - added "static const bool intl" member to meneypunct<> templates 

	  (thanks to Anton Sergeev for the report)

	* _bitset.h : added forward friend decraration for reference (thanks to Anton Sergeev for the report)

	* _tree.h : made _Rb_tree_base_iterator::_M_node initialized in default constructor (thanks to Dean Sturtevant for the report)

	* _set.h : reinterpret_cast<> changed to C-style cast (thanks to Dave Abrahams for the suggestion)

	* Use of raw SGI allocators (like __node_alloc) as an allocator parameter deprecated, 

	  available only with __STL_USE_RAW_SGI_ALLOCATORS macro. May be removed later.

	  __allocator<T> still available unless __STL_NO_EXTENSIONS is specified

	* _limits.h/_limits.c - alignment fix for Solaris;

	* Modified __format_float* routines to take long double as parameter;

          (thatnks to Anthony Williams for the patch)

	* debug/_iterator.h - wrappers for noncompliant compilers moved under 

	  #ifdef __SGI_STL_NO_ARROW_OPERATOR  (thanks to Dave Abrahams for the input)

	* _numeric_facets.h - num_put<> , num_get<> virtual members made outline to work

	  aroung gcc-2.95 bug.

	* <cstdio> : undefined obsolete C macros : getchar/putchar & the like.

	* ctype.cpp : fixed bug with ctype<char>::is (const char*, const char*, mask)

	* ctype.cpp : fixed is(print) for certain platforms where print is a separate flag

	* ftstream.cpp : fixed corner case bug for Win32 text output (thanks for Dirk Schreib for the report) 

	* _streambuf.h, _fstream.h, stdio_strembuf.h : fixed overflow/pbackfail() virtuals definition;

	* _bitset.h : _M_copy_from_string fixed for non-member-template case (thanks to Alex Vanic for the report)

	* gcc-glibc.mak, common_macros.mak : GLIBC compilation fixes (thanks to Thomas Witt for the report)

	* WCHAR_MIN, WCHAR_MAX definitions moved from <limits> to <cwchar>

	* char_traits<char>::to_char_type : parameter changed to int

	* <cstddef> included in <new> (for size_t)

	* _codecvt<>::do_length: fixed first parameter to be const mbstate_t &;

	  virtual fns moved into .cpp, to work aroung gcc bugs

	* _complex.h : fixed complex<>::operator= and constructors signature to take const T& 

	* _istream.c : fixed formatted input involving binary '0'

	* locale_impl.cpp : insertion of time_put<wchar_t> fixed

The following changes were made in 4.0 beta 7 since 4.0 beta 6:

       	* Merged series of fixes/workarounds by Tsutomu Yoshida (thanks!):	

       	* cmath,  _complex.h, stl_apple.h, _deque.h - MPW/MRC specific workarounds

       	* _bitset.h - removed the obsolete _WordT template parameters.

       	* _ctype.h, _codecvt.h, _collate.h, _istream.h,     _messages_facets.h, _monetary.c

       	  _monetary.h, _numeric_facets.h,  _time_facets.h - added workaround for locale's nested class.

       	* _ostream.c_ostream.h - added proposed modification against the <ostream> circular inclusion problem.

       	* test/eh/test_deque.cpp - removed the obsolete template argument

	* _bitset.h - removed obsolete adaptor (thanks to Alex Vanic for the report)

	* _[io]stream.h - removed extra DLL specs (thanks to Danny Smith for the report)

	* stl_msvc.h - fixed bug caused static lib to always be selected

	* gcc.mak - fixed AR definition for static link 

	* Added workaround for static locale::id member in DLL for mingw32 (thanks for Danny Smith for the report)

	* _string_io.h : added _widen() to get getline() compile with wchar (somewhat missing in b6 , thanks to Mikhail Leonov for reminder)

	* threads.h - fixed guards for DreamSega WinCE (thanks to Ben Nason for the report)

	* fstream.cpp : fixed truncation for WIN32 (thanks to Bruce Alderson for the report)

	* _istream.c/_M_ignore_unbuffered() - fixed count bug 

	* _istream.c/ readsome() : fixed extra failbit setting on eof

	* __get_integer - enhanced using a table; input value made unchanged in case of error.

	* __get_base_or_zero - more code factored out

	* stl_wince.h : fixed assert() definition for Win CE (thanks to Andrew Waters for the report)

	* vc_select_lib.h " fixed __declspec selection for Win CE (thanks to Andrew Waters for the report)

	* _rope.c - fixed bug in _S_destr_concat_char_iter (thanks to E.Musser for the fix)

	* debug/_vector.h - fixed DLL export for vector<void*>

	* _vector.h, _deque.h, _bvector.h - obsolete guards around at() methods removed ;

	* type_traits.h - WinCE compatibility fixes for -> operator definition ;

	* _vector.h, _deque,h - removed extra casts (thanks to Andrew Waters for the report)

	* _algobase.h - optimized lexicografical_compare() overload for char*

The following changes were made in 4.0 beta 6 since 4.0 beta 5:

	* Merged changes from SGI STL snapshots 04/03, 04/14, 04/18.

	* Iostreams ported to Apple MPW/MRC (thanks to Tsutomu Yoshida for the contribution)

	* Iostreams ported to OSF1/Tru64 (thanks to Marc W. Mengel for the contribution)

	* Iostreams ported to FreeBSD ( Thanks to Sms for the contribution)

	* <deque> : extra template parameter removed

	* locale::id, locale::facet : reverted to nested classes as standard prescribes

	* _string_io.h : added _widen() to get getline() compile with wchar (thanks to Mikhail Leonov for the patch)

	* collate_byname[_w].cpp : fixes for VC++ 5.0 build w/__STL_DEBUG (thanks to Petr Ovchenkov for the patch)

	* <complex> : __STL_COMPLEX_NAMESPACE defined before inclusion of impl. header 

	              (thanks to Matthew Kelly for the patch)

	* makefiles in "src" : improved to get each compiler to put object files in separate directory :

	  ./obj/$(COMP)/Debug, etc. COMP is given some default value for each compiler, but may be also overridden.

	* "src" subdirectory : added stlport_prefix.h file for precompiled header support; 

	   VC++ makefiles make use of them  

	* stl/_iterator_base.h : provided __STL_NONTEMPL_BASE_MATCH_BUG 

	  workaround for new form of distance().

	* <limits> : added cast to WCHAR_MAX definition (thanks for Dave Abrahams for the report).  

	* stl_user_config.h, stl/_config.h - setting splitted and organized more properly. 

	* time_facets.cpp - extra instantiations removed (thanks to Matti Rintala for the report).

	* stdio_streambuf.h : added explicit qualifications of C lib functions for gcc-2.91

	* SGI code used for compatibility w/older versions are guarded with #ifndef __STL_NO_ANACHRONISMS

	* SGI extensions are guarded with #ifndef __STL_NO_EXTENSIONS

	* SGI/HP anachronisms are guarded with #ifndef __STL_NO_ANACHRONISMS

	* <typeinfo> : .h file included if __STL_NO_NEW_NEW header is set 

	 (thanks to Willie Arbuckle for the report)

	* Suppresed spurious BC55 warnings about iterators

	* complex_io.h - fixed operators declarations for MetroWerks 	

	* debug/_slist.h - cleaned up use of stl_debug_do obsolete macro (thanks to Matti Rintala)

	* debug/_iterator.h, debug/_vector.h - fixed relaxed iterator constructors (thanks to Dave Abrahams for the patch) 

	* stl/_complex.h - fixes for gcc-2.95 on IRIX (thanks to Marc W. Mengel) 

        * debug/_iterator.h : fixed relaxed const/non-const iterator construction for debug mode

	  (thanks to Dave Abrahams for the patch)

	* collate : added workaround for SUNpro linker (thanks to Petr Ovchenkov for the fix)

	* _ios.h, _streambuf.h - added obsolete stuff required by the standard

	* _config.h/stdexcept - introduced __STL_NOTHROW_INHERITED to be used when we actually need

	  exception specification due to inheritance (thanks to Joe for the report)

	* _locale.h:104 : fixed ummaned parameters

	* _tempbuf.h - fixed absent inclusion of _tempbuf.c

	* <exception> : relaxed rules for importing vendor symbols

	* _deque.h - added != operator

	* _streambuf.h - fixed snextc() bug for wchar_t

	* <ostream>, _numeric_facets.h - circular dependency resolved

	* stl/_iosfwd.h - added include guard

	* basic_[io]stream::sentry made inner class again (as per standard) 

	  for non-DLL compilations.

	* vector<void*> is used in locale implementation to reduce code bloat,

	  vector<void*> exported from DLL

	* <stdexcept> : exported more stuff

	* stl_intel.h : ICL config merged into stl_msvc.h

	* gcc.mak - fixed for shared target

The following changes were made in 4.0 beta 5 since 4.0 beta 4:

	* _hastable.c:263 : removed inneeded cast (thanks to Will Fike for the report)

	* debug/_string.h :  added conversion to non-SGI string (thanks to Todd Richmond for the report)

	* _complex.h : fixed DLL declarations for i/o operators

	* _ostream.h : fixed sentry behavoiur and DLL specs.

	* _istream.h : fixed DLL specs, optimized some try/catch blocks

	* _vector.h : fixed vector::insert body definition for __STL_INLINE_MEMBER_TEMPLATES

	* <exception> : more compilers listed as having full exception header

	* debug/_debug.h : added namespace to __STL_ASSERT for EH test which uses this internal macro.

	* resource info fixed (thanks to Michael Entin for the report)

	* debug/_string.h : fixed _M_start resolution bug (thanks to Rob for the report )

	* <new> : added import of new_handler stuff from vendor namespace (thanks to Niran Bala for the report).

	* src/c_locale_glibc - missed directory contents restored (thanks to Todd Rider for the report)

	* mwerks_prj - project updated for new file set, target names for x86 changed to conform to common schema

	* _ostream.c/_istream.c : fixed lookup for _S_eof symbol (thanks to Anton Sergeev for the report)

	* _ios.h - fixed VC++ DLL warning for specializations

	* stl_ibm.h - disabled "long long" due to incomplete support on MVS by request (thanks to Tinny Ng)

	* char_traits.h - worked around weird gcc internal bug (__sz identifier changed to _Sz)

The following changes were made in 4.0 beta 4 since 4.0 beta 3:

	* "src" directory : source divided into smaller parts to be more manageable and to

	  get more cache locality

	* throw specifications removed (macros made void) - thanks to Dave Abrahams for the suggestion

	* stl/_list.c - fixed reverse() "inline", 

	  _deque.h - fixed cast bug for xlC (thanks to Alex Vanic for the reports)

	* stl/_strstream.h - fixed DLL specs (thanks to Parcival Willems for the report)

	* stl/_string.h, debug/_string.h - fixed conversion from native string with __STL_DEBUG

	  (thanks to Todd Richmond for the report).

	* stl/_istream.h - fixed clash of "__N" symbol with ctype.h macro for some compilers

	  (thanks to Kees de Bruin for the report)

	* Configuration fixed for Borland C++ 5.02 compiler [ deque still does not work with it ]

	* gcc-2.7.2 configuration fixed	

	* SGI iostreams now work for Borland 5.5 with static lib , some problems with

	  locale initialization when DLL is used.

	* __get_c_string exported in DLL (thanks to Ed Ball for the report).

	* ENDIAN fixes for CodeWarrior/DEC (thanks to Kevin Wooten for bringing this up)

	* wrap_std/h/strstream.h - added missing wrapper (Thanks to Laurent for the report)

	* stl_hpacc.h - fixed #endif bug, 

	  _limits.h/.c - fixed array initialization, 

	  _string_io.h, _locale.h - fixed circular dependancy,

	  _set.[hc], _hashtable.c, _set.h - added __REINTERPRET_CAST need by some compilers;

	  _i[o]stream.c, _rope.[hc] - lookup fixed for dependant symbols 

	  (thanks to Alain Miniussi for the reports)

After-release minor bugfixes for beta3:

	* stl/_list.c - fixed reverse() [ new SGI code, merged unported first ]

	  Thanks for everybody who reported it.

	* stl/_bvector.h : fixed ambiguity problem with relational iterators

	  for __STL_NO_BOOL case (thanks to Alex Vanic for the report).

	* stl/_alloc.c, stl/_threads.c - fixed static member definitions for compilers

	  that lack automatic static data members (gcc-2.7). Thanks to Huang-Ming Huang 

	  for the report. 

	* standard wide streams initialization bug on Win32 fixed (thanks to Harold Putman for the

	  report)

The following changes were made in 4.0 beta 3 since 4.0 beta 2:

	* Merged SGI changes from 02/18 snapshot.

        * Ming32W (gcc Win32 port using MS runtime lib) is now fully supported. 

	* .dll build schema improved, now builds with mingw32 and Borland C++

	  (Borland has some problem with numeric i/o)

	* VC++ version bugfixes in <xstring>/<xutility>/<xstring> 

	  (thanks to Todd Richmond for the report)

	* _bvector.h - relational operators defined only for "bit_vector", 

	   not for "vector" specializations (thanks to Edward Ball for the report)

	* src/locale_impl.h - fixed multiple defined symbol problem with gcc

	  (Thanks to Matti Rintala for the report)

	* config/stl_ibm.h - __STL_NO_TYPEINFO added (thanks for Tinny Ng).

	* <string> : _stl_string_io.h/c introduced to fight inter-dependencies

	* _bvector.h - added fix for -tempinc compilation on AIX (thanks to Alex Vanic for the patch)

	* fstream.cpp - _M_write bug for Win32 text mode fixed (thanks to Mike Pyle)

	* _string.h : debug version included prior to _string.c;

	* debug/_debug.h/.c, debug/_deque.h, debug/_string.h - fixed debug mode bugs;

	  Apple compilers config fixes / iostream wrapping fixes / EH test fixes,

	  (thanks to Tsutomu Youshida for the patch)

	* csetjmp/setjmp.h - guards added against VC++ #defines (thanks to Gavin Wood)

	* stl/_iosfwd.h : __STL_DEFAULT_CONSTRUCTED used instead of __STL_NULL_CHAR_INIT

	(thanks to Alex Vanic for the report)

	* __stl_get_c_string() - made extern non-template for SGI iostreams mode.

	* __cdecl calling convention fixes - now works for debug & non-debug code.

	* _limits.h/.c : static data moved from inline functions into a class.

	* stlport_msvc.rc resource file added for DLL's (thanks to Michael Entin)

	* stlport/config/stl_wince.h : added abort()/assert() definitions

	  (thanks to Gavin Wood for the report)

	* Initial iostreams port for xlC (thanks to Alexander Vanic for the patch).

	* config files - made safe for C compilers

	* src/c_locale_stub.c - made structure for full platform-dependent 

	  locales other than "C". Glibc implementation merged.

The following changes were made in 4.0 release candidate 2 since 4.0 release candidate 1:

	* Solid approach to __STL_DEFAULT_CONSTRUCTOR_BUG problem implemented,

	  rope.h typo fixed (thanks to Alex Vanic for the report) 

	* getline and stream operators moved from _istream.c to _string.c 

	  where they belong (thanks for Petr Ovchenkov)

	* <new> fixed to import nothrow and nothrow_t

	* Borland C++ 5.5 (free compiler) supported (iostreams won't compile yet).

	* SUN CC 6.0 EA - new features unabled (most announced features still don't work though)

	* HP ACC configuration updated, some fixes for new aCC beta(thanks to Alain Miniussi).

	* Windows CE compatibility fixed (thanks to Gavin Wood for the report)

	* <sstream> fixed for non-SGI case, ios.cpp bug in __STL_NO_EXCEPTIONS 

	  mode fixed, debug iterators fix (thanks to Todd Richmond).

	* VC++ 5.0 and 4.2 compatibility fixed (thanks to Ilya for the report)

	* __cdecl calling convention explicitly specified for VC++ & static/global functions.

	* vc_common.mk : debug type changed to CV (thanks to Mike Pyle for the solution)

	* fstream.cpp : Win32 text mode : bugs fixed, SGI code used.

	  fixed _M_open() creation flags for Win32 (thanks to Mike Pyle for the report)

        * "install" target added for VC++ to install .dll's into Win system directory.

	* __STL_USE_STATIC_LIB switch added to add flexibility to VC++ linking.

	* __stl_debug_message for WIN32/Unicode/MFC improved 

	  (thanks to Edward Ball, Chvetsov for the reports)

	* MVS fix for auto_ptr<> (thanks to Tinny Ng)

	* debug/_tree.h, debug/_vector.h "typename" fixes, thanks to Matti Rintala.

	* c_locale.h : fix for Solaris 2.5.x (thanks to B. K. Oxley)

	* _bvector.h : Watcom compatibility fixed (thanks to Ricardo E. Gayoso for the report)

	* __STL_DONT_REDEFINE_STD flag behaviour fixed

The following changes were made in 4.0 release candidate 1 since 3.2.2 Beta 4 :

	* Merged changes made to SGI standard library snapshot on 01/28.

	* Fixed bug with istream reading numbers in hex mode (thanks to Dave Abrahams

	  for the patch).

	* Debug mode redesigned (again) - no extra namespaces is being used

	  Finally, it works for MSVC and all other platforms.