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142 lines
8.9 KiB
HTML
142 lines
8.9 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>C Implementation (Using the GNU Compiler Collection (GCC))</title>
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<meta name="description" content="C Implementation (Using the GNU Compiler Collection (GCC))">
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<meta name="keywords" content="C Implementation (Using the GNU Compiler Collection (GCC))">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="index.html#Top" rel="up" title="Top">
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<link href="Translation-implementation.html#Translation-implementation" rel="next" title="Translation implementation">
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<link href="Precompiled-Headers.html#Precompiled-Headers" rel="prev" title="Precompiled Headers">
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-->
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</style>
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</head>
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<body lang="en">
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<a name="C-Implementation"></a>
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<div class="header">
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<p>
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Next: <a href="C_002b_002b-Implementation.html#C_002b_002b-Implementation" accesskey="n" rel="next">C++ Implementation</a>, Previous: <a href="Invoking-GCC.html#Invoking-GCC" accesskey="p" rel="prev">Invoking GCC</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="C-Implementation_002dDefined-Behavior"></a>
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<h2 class="chapter">4 C Implementation-Defined Behavior</h2>
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<a name="index-implementation_002ddefined-behavior_002c-C-language"></a>
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<p>A conforming implementation of ISO C is required to document its
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choice of behavior in each of the areas that are designated
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“implementation defined”. The following lists all such areas,
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along with the section numbers from the ISO/IEC 9899:1990, ISO/IEC
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9899:1999 and ISO/IEC 9899:2011 standards. Some areas are only
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implementation-defined in one version of the standard.
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</p>
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<p>Some choices depend on the externally determined ABI for the platform
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(including standard character encodings) which GCC follows; these are
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listed as “determined by ABI” below. See <a href="Compatibility.html#Compatibility">Binary
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Compatibility</a>, and <a href="http://gcc.gnu.org/readings.html">http://gcc.gnu.org/readings.html</a>. Some
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choices are documented in the preprocessor manual.
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See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
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behavior</a> in <cite>The C Preprocessor</cite>. Some choices are made by the
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library and operating system (or other environment when compiling for
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a freestanding environment); refer to their documentation for details.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Translation-implementation.html#Translation-implementation" accesskey="1">Translation implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Environment-implementation.html#Environment-implementation" accesskey="2">Environment implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Identifiers-implementation.html#Identifiers-implementation" accesskey="3">Identifiers implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Characters-implementation.html#Characters-implementation" accesskey="4">Characters implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Integers-implementation.html#Integers-implementation" accesskey="5">Integers implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Floating-point-implementation.html#Floating-point-implementation" accesskey="6">Floating point implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Arrays-and-pointers-implementation.html#Arrays-and-pointers-implementation" accesskey="7">Arrays and pointers implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Hints-implementation.html#Hints-implementation" accesskey="8">Hints implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Structures-unions-enumerations-and-bit_002dfields-implementation.html#Structures-unions-enumerations-and-bit_002dfields-implementation" accesskey="9">Structures unions enumerations and bit-fields implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Qualifiers-implementation.html#Qualifiers-implementation">Qualifiers implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Declarators-implementation.html#Declarators-implementation">Declarators implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Statements-implementation.html#Statements-implementation">Statements implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Preprocessing-directives-implementation.html#Preprocessing-directives-implementation">Preprocessing directives implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Library-functions-implementation.html#Library-functions-implementation">Library functions implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Architecture-implementation.html#Architecture-implementation">Architecture implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Locale_002dspecific-behavior-implementation.html#Locale_002dspecific-behavior-implementation">Locale-specific behavior implementation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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</table>
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<hr>
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<div class="header">
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<p>
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Next: <a href="C_002b_002b-Implementation.html#C_002b_002b-Implementation" accesskey="n" rel="next">C++ Implementation</a>, Previous: <a href="Invoking-GCC.html#Invoking-GCC" accesskey="p" rel="prev">Invoking GCC</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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