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<title>GNU Compiler Collection (GCC) Internals: Config Fragments</title>

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<a name="Scripts-Used-by-configure"></a>
<h4 class="subsubsection">6.3.2.1 Scripts Used by <samp>configure</samp></h4>

<p><samp>configure</samp> uses some other scripts to help in its work:
</p>
<ul>
<li> The standard GNU <samp>config.sub</samp> and <samp>config.guess</samp>
files, kept in the top level directory, are used.

</li><li> The file <samp>config.gcc</samp> is used to handle configuration
specific to the particular target machine.  The file
<samp>config.build</samp> is used to handle configuration specific to the
particular build machine.  The file <samp>config.host</samp> is used to handle
configuration specific to the particular host machine.  (In general,
these should only be used for features that cannot reasonably be tested in
Autoconf feature tests.)
See <a href="System-Config.html#System-Config">The <samp>config.build</samp>; <samp>config.host</samp>;
and <samp>config.gcc</samp> Files</a>, for details of the contents of these files.

</li><li> Each language subdirectory has a file
<samp><var>language</var>/config-lang.in</samp> that is used for
front-end-specific configuration.  See <a href="Front-End-Config.html#Front-End-Config">The Front
End <samp>config-lang.in</samp> File</a>, for details of this file.

</li><li> A helper script <samp>configure.frag</samp> is used as part of
creating the output of <samp>configure</samp>.
</li></ul>


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