| author | stechong |
| Wed, 20 Oct 2010 11:19:31 -0500 | |
| changeset 2165 | 2a7b5eccb0bc |
| parent 1641 | 2b3996fc09a1 |
| permissions | -rw-r--r-- |
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"> |
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> |
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<head> |
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /> |
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<meta http-equiv="Content-Style-Type" content="text/css" /> |
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<meta name="LASTUPDATED" content="06/17/05 11:09:43" /> |
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<title>access_errors</title> |
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<link rel="StyleSheet" href="../../book.css" type="text/css"/> |
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</head> |
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10 |
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<body> |
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<h3>gcc_extensions</h3> |
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<p>Controls the acceptance of GNU C language extensions. </p> |
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<h5>Syntax</h5> |
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<p class="code">#pragma gcc_extensions on | off | reset |
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</p> |
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<h5>Targets</h5> |
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All platforms.<br /> |
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<h5>Remarks</h5> |
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<p>If you enable this pragma, the compiler accepts GNU C extensions in C source code. This includes the following non-ANSI C extensions:</p> |
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<ul> |
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<li>Initialization of automatic struct or array variables with non-const values</li> |
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</ul> |
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<blockquote> |
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<p class="listing"> int foo(int arg)<br /> |
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{<br />
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int arr[2] = { arg, arg+1 };<br />
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}</p> |
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</blockquote> |
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<ul> |
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<li class="code">sizeof( void ) == 1</li> |
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<li class="code">sizeof( function-type ) == 1</li> |
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<li>Limited support for GCC statements and declarations within expressions</li> |
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</ul> |
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<blockquote> |
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<p class="listing">pragma gcc_extensions on<br /> |
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#define POW2(n) ({ int i,r; for(r=1,i=n; i>0; --i) r<<=1; r;})</p>
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<p>This feature only works for expressions in function bodies and does not support code that requires any form of C++ exception handling (for example, throwing or catching exceptions or creating local or temporary class objects that require a destructor call).</p> |
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<p class="listing">int main()<br /> |
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{<br />
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return POW2(4);<br /> |
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}</p> |
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</blockquote> |
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<ul> |
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<li>Macro redefinitions without a previous #undef.</li> |
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<li>The GCC keyword <span class="code">typeof</span>. See “The __typeof__() and typeof() operators”, “Initialization of Local Arrays and Structures” for a description of these extensions.</li> |
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<li>Function pointer arithmetic supported</li> |
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<li><span class="code">void*</span> arithmetic supported</li> |
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<li><span class="code">__builtin_constant_p (<expr>)</span> supported</li> |
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<li>Forward declarations of arrays of incomplete type supported</li> |
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<li>Pre-C99 designated initializer syntax (deprecated) supported</li> |
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</ul> |
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<blockquote> |
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<p class="listing">#pragma gcc_extensions on<br /> |
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struct S { int a, b, b; } s = { c:3, b:2, a:1 };</p>
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</blockquote> |
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<ul> |
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<li>Conditionals with omitted Operands supported</li> |
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</ul> |
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<blockquote> |
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<p class="listing"> #pragma gcc_extensions on<br /> |
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int x, y, z;<br /> |
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x = y ?: z;<br /> |
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Outputs:<br /> |
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x = y ? y ? z;</p> |
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</blockquote> |
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<ul> |
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<li><span class="code">long __builtin_expect (long exp, long c)</span> now accepted</li> |
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</ul> |
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<p>This pragma corresponds to the Enable <a href="../pragmas/p_gcc_extensions.htm">GCC Extensions</a> setting . To check the global optimizer, use <span class="code">__option (gcc_extensions)</span>, described in <a href="../symbols/sym_settings.htm">Checking Settings</a>. The default setting is <span class="code">off</span>.<br /> |
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</p> |
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<p></p> |
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<div id="footer">Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. <br>License: <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a></div> |
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</body> |
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</html> |