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<a name="Files-Created-by-configure"></a>
<h4 class="subsubsection">6.3.2.3 Files Created by <code>configure</code></h4>

<p>Here we spell out what files will be set up by <samp>configure</samp> in the
<samp>gcc</samp> directory.  Some other files are created as temporary files
in the configuration process, and are not used in the subsequent
build; these are not documented.
</p>
<ul>
<li> <samp>Makefile</samp> is constructed from <samp>Makefile.in</samp>, together with
the host and target fragments (see <a href="Fragments.html#Fragments">Makefile
Fragments</a>) <samp>t-<var>target</var></samp> and <samp>x-<var>host</var></samp> from
<samp>config</samp>, if any, and language Makefile fragments
<samp><var>language</var>/Make-lang.in</samp>.
</li><li> <samp>auto-host.h</samp> contains information about the host machine
determined by <samp>configure</samp>.  If the host machine is different from
the build machine, then <samp>auto-build.h</samp> is also created,
containing such information about the build machine.
</li><li> <samp>config.status</samp> is a script that may be run to recreate the
current configuration.
</li><li> <samp>configargs.h</samp> is a header containing details of the arguments
passed to <samp>configure</samp> to configure GCC, and of the thread model
used.
</li><li> <samp>cstamp-h</samp> is used as a timestamp.
</li><li> If a language <samp>config-lang.in</samp> file (see <a href="Front-End-Config.html#Front-End-Config">The Front End <samp>config-lang.in</samp> File</a>) sets <code>outputs</code>, then
the files listed in <code>outputs</code> there are also generated.
</li></ul>

<p>The following configuration headers are created from the Makefile,
using <samp>mkconfig.sh</samp>, rather than directly by <samp>configure</samp>.
<samp>config.h</samp>, <samp>bconfig.h</samp> and <samp>tconfig.h</samp> all contain the
<samp>xm-<var>machine</var>.h</samp> header, if any, appropriate to the host,
build and target machines respectively, the configuration headers for
the target, and some definitions; for the host and build machines,
these include the autoconfigured headers generated by
<samp>configure</samp>.  The other configuration headers are determined by
<samp>config.gcc</samp>.  They also contain the typedefs for <code>rtx</code>,
<code>rtvec</code> and <code>tree</code>.
</p>
<ul>
<li> <samp>config.h</samp>, for use in programs that run on the host machine.
</li><li> <samp>bconfig.h</samp>, for use in programs that run on the build machine.
</li><li> <samp>tconfig.h</samp>, for use in programs and libraries for the target
machine.
</li><li> <samp>tm_p.h</samp>, which includes the header <samp><var>machine</var>-protos.h</samp>
that contains prototypes for functions in the target
<samp><var>machine</var>.c</samp> file.  The header <samp><var>machine</var>-protos.h</samp>
can include prototypes of functions that use rtl and tree data
structures inside appropriate <code>#ifdef RTX_CODE</code> and <code>#ifdef
TREE_CODE</code> conditional code segements.  The
<samp><var>machine</var>-protos.h</samp> is included after the <samp>rtl.h</samp>
and/or <samp>tree.h</samp> would have been included.  The <samp>tm_p.h</samp> also
includes the header <samp>tm-preds.h</samp> which is generated by
<samp>genpreds</samp> program during the build to define the declarations
and inline functions for the predicate functions.
</li></ul>

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