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<title>Using the GNU Compiler Collection (GCC): C++ Implementation</title>
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<a name="C_002b_002b-Implementation"></a>
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<p>
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Next: <a href="C-Extensions.html#C-Extensions" accesskey="n" rel="next">C Extensions</a>, Previous: <a href="C-Implementation.html#C-Implementation" accesskey="p" rel="prev">C Implementation</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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<a name="C_002b_002b-Implementation_002dDefined-Behavior"></a>
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<h2 class="chapter">5 C++ Implementation-Defined Behavior</h2>
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<a name="index-implementation_002ddefined-behavior_002c-C_002b_002b-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 14882:1998 and ISO/IEC
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14882:2003 standards. Some areas are only implementation-defined in
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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 documented in
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the 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
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system (or other environment when compiling for a freestanding
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environment); refer to their documentation for details.
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</p>
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<tr><td align="left" valign="top">• <a href="Conditionally_002dsupported-behavior.html#Conditionally_002dsupported-behavior" accesskey="1">Conditionally-supported behavior</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="Exception-handling.html#Exception-handling" accesskey="2">Exception handling</a>:</td><td> </td><td align="left" valign="top">
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