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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

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  25. <title>C Implementation (Using the GNU Compiler Collection (GCC))</title>

  26. 

  27. <meta name="description" content="C Implementation (Using the GNU Compiler Collection (GCC))">

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  34. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  35. <link href="index.html#Top" rel="up" title="Top">

  36. <link href="Translation-implementation.html#Translation-implementation" rel="next" title="Translation implementation">

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  68. 

  69. <body lang="en">

  70. <a name="C-Implementation"></a>

  71. <div class="header">

  72. <p>

  73. 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> &nbsp; [<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>

  74. </div>

  75. <hr>

  76. <a name="C-Implementation_002dDefined-Behavior"></a>

  77. <h2 class="chapter">4 C Implementation-Defined Behavior</h2>

  78. <a name="index-implementation_002ddefined-behavior_002c-C-language"></a>

  79. 

  80. <p>A conforming implementation of ISO C is required to document its

  81. choice of behavior in each of the areas that are designated

  82. &ldquo;implementation defined&rdquo;.  The following lists all such areas,

  83. along with the section numbers from the ISO/IEC 9899:1990, ISO/IEC

  84. 9899:1999 and ISO/IEC 9899:2011 standards.  Some areas are only

  85. implementation-defined in one version of the standard.

  86. </p>

  87. <p>Some choices depend on the externally determined ABI for the platform

  88. (including standard character encodings) which GCC follows; these are

  89. listed as &ldquo;determined by ABI&rdquo; below.  See <a href="Compatibility.html#Compatibility">Binary

  90. Compatibility</a>, and <a href="http://gcc.gnu.org/readings.html">http://gcc.gnu.org/readings.html</a>.  Some

  91. choices are documented in the preprocessor manual.

  92. See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined

  93. behavior</a> in <cite>The C Preprocessor</cite>.  Some choices are made by the

  94. library and operating system (or other environment when compiling for

  95. a freestanding environment); refer to their documentation for details.

  96. </p>

  97. <table class="menu" border="0" cellspacing="0">

  98. <tr><td align="left" valign="top">&bull; <a href="Translation-implementation.html#Translation-implementation" accesskey="1">Translation implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  99. </td></tr>

  100. <tr><td align="left" valign="top">&bull; <a href="Environment-implementation.html#Environment-implementation" accesskey="2">Environment implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  101. </td></tr>

  102. <tr><td align="left" valign="top">&bull; <a href="Identifiers-implementation.html#Identifiers-implementation" accesskey="3">Identifiers implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  103. </td></tr>

  104. <tr><td align="left" valign="top">&bull; <a href="Characters-implementation.html#Characters-implementation" accesskey="4">Characters implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  105. </td></tr>

  106. <tr><td align="left" valign="top">&bull; <a href="Integers-implementation.html#Integers-implementation" accesskey="5">Integers implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  107. </td></tr>

  108. <tr><td align="left" valign="top">&bull; <a href="Floating-point-implementation.html#Floating-point-implementation" accesskey="6">Floating point implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  109. </td></tr>

  110. <tr><td align="left" valign="top">&bull; <a href="Arrays-and-pointers-implementation.html#Arrays-and-pointers-implementation" accesskey="7">Arrays and pointers implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  111. </td></tr>

  112. <tr><td align="left" valign="top">&bull; <a href="Hints-implementation.html#Hints-implementation" accesskey="8">Hints implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  113. </td></tr>

  114. <tr><td align="left" valign="top">&bull; <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>&nbsp;&nbsp;</td><td align="left" valign="top">

  115. </td></tr>

  116. <tr><td align="left" valign="top">&bull; <a href="Qualifiers-implementation.html#Qualifiers-implementation">Qualifiers implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  117. </td></tr>

  118. <tr><td align="left" valign="top">&bull; <a href="Declarators-implementation.html#Declarators-implementation">Declarators implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  119. </td></tr>

  120. <tr><td align="left" valign="top">&bull; <a href="Statements-implementation.html#Statements-implementation">Statements implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  121. </td></tr>

  122. <tr><td align="left" valign="top">&bull; <a href="Preprocessing-directives-implementation.html#Preprocessing-directives-implementation">Preprocessing directives implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  123. </td></tr>

  124. <tr><td align="left" valign="top">&bull; <a href="Library-functions-implementation.html#Library-functions-implementation">Library functions implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  125. </td></tr>

  126. <tr><td align="left" valign="top">&bull; <a href="Architecture-implementation.html#Architecture-implementation">Architecture implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  127. </td></tr>

  128. <tr><td align="left" valign="top">&bull; <a href="Locale_002dspecific-behavior-implementation.html#Locale_002dspecific-behavior-implementation">Locale-specific behavior implementation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  129. </td></tr>

  130. </table>

  131. 

  132. <hr>

  133. <div class="header">

  134. <p>

  135. 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> &nbsp; [<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>

  136. </div>

  137. 

  138. 

  139. 

  140. </body>

  141. </html>