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<a name="Identifiers-implementation"></a>
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Next: <a rel="next" accesskey="n" href="Characters-implementation.html#Characters-implementation">Characters implementation</a>,
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Previous: <a rel="previous" accesskey="p" href="Environment-implementation.html#Environment-implementation">Environment implementation</a>,
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<h3 class="section">4.3 Identifiers</h3>
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<ul>
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<li><cite>Which additional multibyte characters may appear in identifiers
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and their correspondence to universal character names (C99 and C11 6.4.2).</cite>
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<p>See <a href="../cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined behavior</a>.
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<li><cite>The number of significant initial characters in an identifier
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(C90 6.1.2, C90, C99 and C11 5.2.4.1, C99 and C11 6.4.2).</cite>
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<p>For internal names, all characters are significant. For external names,
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the number of significant characters are defined by the linker; for
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almost all targets, all characters are significant.
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<li><cite>Whether case distinctions are significant in an identifier with
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external linkage (C90 6.1.2).</cite>
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<p>This is a property of the linker. C99 and C11 require that case distinctions
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are always significant in identifiers with external linkage and
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systems without this property are not supported by GCC.
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