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<h5 class="subsubsection">6.3.2.3 Files Created by <code>configure</code></h5>
<p>Here we spell out what files will be set up by <samp><span class="file">configure</span></samp> in the
<samp><span class="file">gcc</span></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.
<ul>
<li><samp><span class="file">Makefile</span></samp> is constructed from <samp><span class="file">Makefile.in</span></samp>, together with
the host and target fragments (see <a href="Fragments.html#Fragments">Makefile Fragments</a>) <samp><span class="file">t-</span><var>target</var></samp> and <samp><span class="file">x-</span><var>host</var></samp> from
<samp><span class="file">config</span></samp>, if any, and language Makefile fragments
<samp><var>language</var><span class="file">/Make-lang.in</span></samp>.
<li><samp><span class="file">auto-host.h</span></samp> contains information about the host machine
determined by <samp><span class="file">configure</span></samp>. If the host machine is different from
the build machine, then <samp><span class="file">auto-build.h</span></samp> is also created,
containing such information about the build machine.
<li><samp><span class="file">config.status</span></samp> is a script that may be run to recreate the
current configuration.
<li><samp><span class="file">configargs.h</span></samp> is a header containing details of the arguments
passed to <samp><span class="file">configure</span></samp> to configure GCC, and of the thread model
used.
<li><samp><span class="file">cstamp-h</span></samp> is used as a timestamp.
<li>If a language <samp><span class="file">config-lang.in</span></samp> file (see <a href="Front-End-Config.html#Front-End-Config">The Front End <samp><span class="file">config-lang.in</span></samp> File</a>) sets <code>outputs</code>, then
the files listed in <code>outputs</code> there are also generated.
</ul>
<p>The following configuration headers are created from the Makefile,
using <samp><span class="file">mkconfig.sh</span></samp>, rather than directly by <samp><span class="file">configure</span></samp>.
<samp><span class="file">config.h</span></samp>, <samp><span class="file">bconfig.h</span></samp> and <samp><span class="file">tconfig.h</span></samp> all contain the
<samp><span class="file">xm-</span><var>machine</var><span class="file">.h</span></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><span class="file">configure</span></samp>. The other configuration headers are determined by
<samp><span class="file">config.gcc</span></samp>. They also contain the typedefs for <code>rtx</code>,
<code>rtvec</code> and <code>tree</code>.
<ul>
<li><samp><span class="file">config.h</span></samp>, for use in programs that run on the host machine.
<li><samp><span class="file">bconfig.h</span></samp>, for use in programs that run on the build machine.
<li><samp><span class="file">tconfig.h</span></samp>, for use in programs and libraries for the target
machine.
<li><samp><span class="file">tm_p.h</span></samp>, which includes the header <samp><var>machine</var><span class="file">-protos.h</span></samp>
that contains prototypes for functions in the target
<samp><var>machine</var><span class="file">.c</span></samp> file. The header <samp><var>machine</var><span class="file">-protos.h</span></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><span class="file">-protos.h</span></samp> is included after the <samp><span class="file">rtl.h</span></samp>
and/or <samp><span class="file">tree.h</span></samp> would have been included. The <samp><span class="file">tm_p.h</span></samp> also
includes the header <samp><span class="file">tm-preds.h</span></samp> which is generated by
<samp><span class="file">genpreds</span></samp> program during the build to define the declarations
and inline functions for the predicate functions.
</ul>
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