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<title>C Implementation - Using the GNU Compiler Collection (GCC)</title>
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A GNU Manual
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<a name="C-Implementation"></a>
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Next: <a rel="next" accesskey="n" href="C_002b_002b-Implementation.html#C_002b_002b-Implementation">C++ Implementation</a>,
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Previous: <a rel="previous" accesskey="p" href="Invoking-GCC.html#Invoking-GCC">Invoking GCC</a>,
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Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
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<h2 class="chapter">4 C Implementation-Defined Behavior</h2>
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<p><a name="index-implementation_002ddefined-behavior_002c-C-language-2859"></a>
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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>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 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="../cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined behavior</a>. 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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<ul class="menu">
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<li><a accesskey="1" href="Translation-implementation.html#Translation-implementation">Translation implementation</a>
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<li><a accesskey="2" href="Environment-implementation.html#Environment-implementation">Environment implementation</a>
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<li><a accesskey="3" href="Identifiers-implementation.html#Identifiers-implementation">Identifiers implementation</a>
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<li><a accesskey="4" href="Characters-implementation.html#Characters-implementation">Characters implementation</a>
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<li><a accesskey="5" href="Integers-implementation.html#Integers-implementation">Integers implementation</a>
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<li><a accesskey="6" href="Floating-point-implementation.html#Floating-point-implementation">Floating point implementation</a>
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<li><a accesskey="7" href="Arrays-and-pointers-implementation.html#Arrays-and-pointers-implementation">Arrays and pointers implementation</a>
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<li><a accesskey="8" href="Hints-implementation.html#Hints-implementation">Hints implementation</a>
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<li><a accesskey="9" href="Structures-unions-enumerations-and-bit_002dfields-implementation.html#Structures-unions-enumerations-and-bit_002dfields-implementation">Structures unions enumerations and bit-fields implementation</a>
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<li><a href="Qualifiers-implementation.html#Qualifiers-implementation">Qualifiers implementation</a>
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<li><a href="Declarators-implementation.html#Declarators-implementation">Declarators implementation</a>
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<li><a href="Statements-implementation.html#Statements-implementation">Statements implementation</a>
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<li><a href="Preprocessing-directives-implementation.html#Preprocessing-directives-implementation">Preprocessing directives implementation</a>
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<li><a href="Library-functions-implementation.html#Library-functions-implementation">Library functions implementation</a>
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<li><a href="Architecture-implementation.html#Architecture-implementation">Architecture implementation</a>
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<li><a href="Locale_002dspecific-behavior-implementation.html#Locale_002dspecific-behavior-implementation">Locale-specific behavior implementation</a>
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</ul>
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</body></html>
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