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<h5 class="subsubsection">6.3.8.1 The Front End <samp><var>language</var></samp> Directory</h5>
<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><span class="file">gcc</span></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:
<dl>
<dt><samp><span class="file">config-lang.in</span></samp><dd>This file is required in all language subdirectories. See <a href="Front-End-Config.html#Front-End-Config">The Front End <samp><span class="file">config-lang.in</span></samp> File</a>, for details of
its contents
<br><dt><samp><span class="file">Make-lang.in</span></samp><dd>This file is required in all language subdirectories. See <a href="Front-End-Makefile.html#Front-End-Makefile">The Front End <samp><span class="file">Make-lang.in</span></samp> File</a>, for details of its
contents.
<br><dt><samp><span class="file">lang.opt</span></samp><dd>This file registers the set of switches that the front end accepts on
the command line, and their <samp><span class="option">--help</span></samp> text. See <a href="Options.html#Options">Options</a>.
<br><dt><samp><span class="file">lang-specs.h</span></samp><dd>This file provides entries for <code>default_compilers</code> in
<samp><span class="file">gcc.c</span></samp> which override the default of giving an error that a
compiler for that language is not installed.
<br><dt><samp><var>language</var><span class="file">-tree.def</span></samp><dd>This file, which need not exist, defines any language-specific tree
codes.
</dl>
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