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| <h2 class="chapter">4 C Implementation-defined behavior</h2> |
| |
| <p><a name="index-implementation_002ddefined-behavior_002c-C-language-2171"></a> |
| A conforming implementation of ISO C is required to document its |
| choice of behavior in each of the areas that are designated |
| “implementation defined”. The following lists all such areas, |
| along with the section numbers from the ISO/IEC 9899:1990 and ISO/IEC |
| 9899:1999 standards. Some areas are only implementation-defined in |
| one version of the standard. |
| |
| <p>Some choices depend on the externally determined ABI for the platform |
| (including standard character encodings) which GCC follows; these are |
| 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 |
| choices are documented in the preprocessor manual. |
| See <a href="../cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined behavior</a>. Some choices are made by the |
| library and operating system (or other environment when compiling for |
| a freestanding environment); refer to their documentation for details. |
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| <li><a accesskey="1" href="Translation-implementation.html#Translation-implementation">Translation implementation</a> |
| <li><a accesskey="2" href="Environment-implementation.html#Environment-implementation">Environment implementation</a> |
| <li><a accesskey="3" href="Identifiers-implementation.html#Identifiers-implementation">Identifiers implementation</a> |
| <li><a accesskey="4" href="Characters-implementation.html#Characters-implementation">Characters implementation</a> |
| <li><a accesskey="5" href="Integers-implementation.html#Integers-implementation">Integers implementation</a> |
| <li><a accesskey="6" href="Floating-point-implementation.html#Floating-point-implementation">Floating point implementation</a> |
| <li><a accesskey="7" href="Arrays-and-pointers-implementation.html#Arrays-and-pointers-implementation">Arrays and pointers implementation</a> |
| <li><a accesskey="8" href="Hints-implementation.html#Hints-implementation">Hints implementation</a> |
| <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> |
| <li><a href="Qualifiers-implementation.html#Qualifiers-implementation">Qualifiers implementation</a> |
| <li><a href="Declarators-implementation.html#Declarators-implementation">Declarators implementation</a> |
| <li><a href="Statements-implementation.html#Statements-implementation">Statements implementation</a> |
| <li><a href="Preprocessing-directives-implementation.html#Preprocessing-directives-implementation">Preprocessing directives implementation</a> |
| <li><a href="Library-functions-implementation.html#Library-functions-implementation">Library functions implementation</a> |
| <li><a href="Architecture-implementation.html#Architecture-implementation">Architecture implementation</a> |
| <li><a href="Locale_002dspecific-behavior-implementation.html#Locale_002dspecific-behavior-implementation">Locale-specific behavior implementation</a> |
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