1<html lang="en"> 2<head> 3<title>C++ Implementation - Using the GNU Compiler Collection (GCC)</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Using the GNU Compiler Collection (GCC)"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="prev" href="C-Extensions.html#C-Extensions" title="C Extensions"> 9<link rel="next" href="C_002b_002b-Extensions.html#C_002b_002b-Extensions" title="C++ Extensions"> 10<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 11<!-- 12Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 131998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 142010 Free Software Foundation, Inc. 15 16Permission is granted to copy, distribute and/or modify this document 17under the terms of the GNU Free Documentation License, Version 1.3 or 18any later version published by the Free Software Foundation; with the 19Invariant Sections being ``Funding Free Software'', the Front-Cover 20Texts being (a) (see below), and with the Back-Cover Texts being (b) 21(see below). A copy of the license is included in the section entitled 22``GNU Free Documentation License''. 23 24(a) The FSF's Front-Cover Text is: 25 26 A GNU Manual 27 28(b) The FSF's Back-Cover Text is: 29 30 You have freedom to copy and modify this GNU Manual, like GNU 31 software. Copies published by the Free Software Foundation raise 32 funds for GNU development.--> 33<meta http-equiv="Content-Style-Type" content="text/css"> 34<style type="text/css"><!-- 35 pre.display { font-family:inherit } 36 pre.format { font-family:inherit } 37 pre.smalldisplay { font-family:inherit; font-size:smaller } 38 pre.smallformat { font-family:inherit; font-size:smaller } 39 pre.smallexample { font-size:smaller } 40 pre.smalllisp { font-size:smaller } 41 span.sc { font-variant:small-caps } 42 span.roman { font-family:serif; font-weight:normal; } 43 span.sansserif { font-family:sans-serif; font-weight:normal; } 44--></style> 45<link rel="stylesheet" type="text/css" href="../cs.css"> 46</head> 47<body> 48<div class="node"> 49<a name="C++-Implementation"></a> 50<a name="C_002b_002b-Implementation"></a> 51<p> 52Next: <a rel="next" accesskey="n" href="C_002b_002b-Extensions.html#C_002b_002b-Extensions">C++ Extensions</a>, 53Previous: <a rel="previous" accesskey="p" href="C-Extensions.html#C-Extensions">C Extensions</a>, 54Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a> 55<hr> 56</div> 57 58<h2 class="chapter">5 C++ Implementation-defined behavior</h2> 59 60<p><a name="index-implementation_002ddefined-behavior_002c-C_002b_002b-language-2235"></a> 61A conforming implementation of ISO C++ is required to document its 62choice of behavior in each of the areas that are designated 63“implementation defined”. The following lists all such areas, 64along with the section numbers from the ISO/IEC 14822:1998 and ISO/IEC 6514822:2003 standards. Some areas are only implementation-defined in 66one version of the standard. 67 68 <p>Some choices depend on the externally determined ABI for the platform 69(including standard character encodings) which GCC follows; these are 70listed as “determined by ABI” below. See <a href="Compatibility.html#Compatibility">Binary Compatibility</a>, and <a href="http://gcc.gnu.org/readings.html">http://gcc.gnu.org/readings.html</a>. Some 71choices are documented in the preprocessor manual. 72See <a href="../cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined behavior</a>. Some choices are documented in 73the corresponding document for the C language. See <a href="C-Implementation.html#C-Implementation">C Implementation</a>. Some choices are made by the library and operating 74system (or other environment when compiling for a freestanding 75environment); refer to their documentation for details. 76 77<ul class="menu"> 78<li><a accesskey="1" href="Conditionally_002dsupported-behavior.html#Conditionally_002dsupported-behavior">Conditionally-supported behavior</a> 79<li><a accesskey="2" href="Exception-handling.html#Exception-handling">Exception handling</a> 80</ul> 81 82 </body></html> 83 84