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<a name="Environment"></a>
<h3 class="section">4.2 Environment</h3>

<p>The behavior of most of these points are dependent on the implementation
of the C library, and are not defined by GCC itself.
</p>
<ul>
<li> <cite>The mapping between physical source file multibyte characters
and the source character set in translation phase 1 (C90, C99 and C11
5.1.1.2).</cite>

<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
behavior</a> in <cite>The C Preprocessor</cite>.
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