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<a name="Front-End-Config"></a>
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<a name="The-Front-End-config_002dlang_002ein-File"></a>
<h4 class="subsubsection">6.3.8.2 The Front End <samp>config-lang.in</samp> File</h4>

<p>Each language subdirectory contains a <samp>config-lang.in</samp> file.
This file is a shell script that may define some variables describing
the language:
</p>
<dl compact="compact">
<dt><code>language</code></dt>
<dd><p>This definition must be present, and gives the name of the language
for some purposes such as arguments to <samp>--enable-languages</samp>.
</p></dd>
<dt><code>lang_requires</code></dt>
<dd><p>If defined, this variable lists (space-separated) language front ends
other than C that this front end requires to be enabled (with the
names given being their <code>language</code> settings).  For example, the
Obj-C++ front end depends on the C++ and ObjC front ends, so sets
&lsquo;<samp>lang_requires=&quot;objc c++&quot;</samp>&rsquo;.
</p></dd>
<dt><code>subdir_requires</code></dt>
<dd><p>If defined, this variable lists (space-separated) front end directories
other than C that this front end requires to be present.  For example,
the Objective-C++ front end uses source files from the C++ and
Objective-C front ends, so sets &lsquo;<samp>subdir_requires=&quot;cp objc&quot;</samp>&rsquo;.
</p></dd>
<dt><code>target_libs</code></dt>
<dd><p>If defined, this variable lists (space-separated) targets in the top
level <samp>Makefile</samp> to build the runtime libraries for this
language, such as <code>target-libobjc</code>.
</p></dd>
<dt><code>lang_dirs</code></dt>
<dd><p>If defined, this variable lists (space-separated) top level
directories (parallel to <samp>gcc</samp>), apart from the runtime libraries,
that should not be configured if this front end is not built.
</p></dd>
<dt><code>build_by_default</code></dt>
<dd><p>If defined to &lsquo;<samp>no</samp>&rsquo;, this language front end is not built unless
enabled in a <samp>--enable-languages</samp> argument.  Otherwise, front
ends are built by default, subject to any special logic in
<samp>configure.ac</samp> (as is present to disable the Ada front end if the
Ada compiler is not already installed).
</p></dd>
<dt><code>boot_language</code></dt>
<dd><p>If defined to &lsquo;<samp>yes</samp>&rsquo;, this front end is built in stage1 of the
bootstrap.  This is only relevant to front ends written in their own
languages.
</p></dd>
<dt><code>compilers</code></dt>
<dd><p>If defined, a space-separated list of compiler executables that will
be run by the driver.  The names here will each end
with &lsquo;<samp>\$(exeext)</samp>&rsquo;.
</p></dd>
<dt><code>outputs</code></dt>
<dd><p>If defined, a space-separated list of files that should be generated
by <samp>configure</samp> substituting values in them.  This mechanism can
be used to create a file <samp><var>language</var>/Makefile</samp> from
<samp><var>language</var>/Makefile.in</samp>, but this is deprecated, building
everything from the single <samp>gcc/Makefile</samp> is preferred.
</p></dd>
<dt><code>gtfiles</code></dt>
<dd><p>If defined, a space-separated list of files that should be scanned by
<samp>gengtype.c</samp> to generate the garbage collection tables and routines for
this language.  This excludes the files that are common to all front
ends.  See <a href="Type-Information.html#Type-Information">Type Information</a>.
</p>
</dd>
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