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Next: <a href="Front-End-Config.html#Front-End-Config" accesskey="n" rel="next">Front End Config</a>, Up: <a href="Front-End.html#Front-End" accesskey="u" rel="up">Front End</a> &nbsp; [<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="The-Front-End-language-Directory"></a>
<h4 class="subsubsection">6.3.8.1 The Front End <samp><var>language</var></samp> Directory</h4>

<p>A front end <samp><var>language</var></samp> directory contains the source files
of that front end (but not of any runtime libraries, which should be
outside the <samp>gcc</samp> directory).  This includes documentation, and
possibly some subsidiary programs built alongside the front end.
Certain files are special and other parts of the compiler depend on
their names:
</p>
<dl compact="compact">
<dt><samp>config-lang.in</samp></dt>
<dd><p>This file is required in all language subdirectories.  See <a href="Front-End-Config.html#Front-End-Config">The Front End <samp>config-lang.in</samp> File</a>, for details of
its contents
</p></dd>
<dt><samp>Make-lang.in</samp></dt>
<dd><p>This file is required in all language subdirectories.  See <a href="Front-End-Makefile.html#Front-End-Makefile">The Front End <samp>Make-lang.in</samp> File</a>, for details of its
contents.
</p></dd>
<dt><samp>lang.opt</samp></dt>
<dd><p>This file registers the set of switches that the front end accepts on
the command line, and their <samp>--help</samp> text.  See <a href="Options.html#Options">Options</a>.
</p></dd>
<dt><samp>lang-specs.h</samp></dt>
<dd><p>This file provides entries for <code>default_compilers</code> in
<samp>gcc.c</samp> which override the default of giving an error that a
compiler for that language is not installed.
</p></dd>
<dt><samp><var>language</var>-tree.def</samp></dt>
<dd><p>This file, which need not exist, defines any language-specific tree
codes.
</p></dd>
</dl>


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