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<a name="Front-End-Config"></a>
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<div class="header">
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<p>
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Next: <a href="Front-End-Makefile.html#Front-End-Makefile" accesskey="n" rel="next">Front End Makefile</a>, Previous: <a href="Front-End-Directory.html#Front-End-Directory" accesskey="p" rel="prev">Front End Directory</a>, Up: <a href="Front-End.html#Front-End" accesskey="u" rel="up">Front End</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="The-Front-End-config_002dlang_002ein-File"></a>
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<h4 class="subsubsection">6.3.8.2 The Front End <samp>config-lang.in</samp> File</h4>
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<p>Each language subdirectory contains a <samp>config-lang.in</samp> file.
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This file is a shell script that may define some variables describing
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the language:
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</p>
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<dl compact="compact">
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<dt><code>language</code></dt>
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<dd><p>This definition must be present, and gives the name of the language
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for some purposes such as arguments to <samp>--enable-languages</samp>.
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</p></dd>
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<dt><code>lang_requires</code></dt>
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<dd><p>If defined, this variable lists (space-separated) language front ends
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other than C that this front end requires to be enabled (with the
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names given being their <code>language</code> settings). For example, the
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Java front end depends on the C++ front end, so sets
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‘<samp>lang_requires=c++</samp>’.
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</p></dd>
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<dt><code>subdir_requires</code></dt>
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<dd><p>If defined, this variable lists (space-separated) front end directories
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other than C that this front end requires to be present. For example,
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the Objective-C++ front end uses source files from the C++ and
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Objective-C front ends, so sets ‘<samp>subdir_requires="cp objc"</samp>’.
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</p></dd>
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<dt><code>target_libs</code></dt>
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<dd><p>If defined, this variable lists (space-separated) targets in the top
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level <samp>Makefile</samp> to build the runtime libraries for this
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language, such as <code>target-libobjc</code>.
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</p></dd>
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<dt><code>lang_dirs</code></dt>
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<dd><p>If defined, this variable lists (space-separated) top level
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directories (parallel to <samp>gcc</samp>), apart from the runtime libraries,
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that should not be configured if this front end is not built.
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</p></dd>
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<dt><code>build_by_default</code></dt>
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<dd><p>If defined to ‘<samp>no</samp>’, this language front end is not built unless
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enabled in a <samp>--enable-languages</samp> argument. Otherwise, front
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ends are built by default, subject to any special logic in
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<samp>configure.ac</samp> (as is present to disable the Ada front end if the
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Ada compiler is not already installed).
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</p></dd>
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<dt><code>boot_language</code></dt>
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<dd><p>If defined to ‘<samp>yes</samp>’, this front end is built in stage1 of the
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bootstrap. This is only relevant to front ends written in their own
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languages.
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</p></dd>
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<dt><code>compilers</code></dt>
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<dd><p>If defined, a space-separated list of compiler executables that will
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be run by the driver. The names here will each end
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with ‘<samp>\$(exeext)</samp>’.
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</p></dd>
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<dt><code>outputs</code></dt>
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<dd><p>If defined, a space-separated list of files that should be generated
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by <samp>configure</samp> substituting values in them. This mechanism can
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be used to create a file <samp><var>language</var>/Makefile</samp> from
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<samp><var>language</var>/Makefile.in</samp>, but this is deprecated, building
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everything from the single <samp>gcc/Makefile</samp> is preferred.
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</p></dd>
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<dt><code>gtfiles</code></dt>
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<dd><p>If defined, a space-separated list of files that should be scanned by
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<samp>gengtype.c</samp> to generate the garbage collection tables and routines for
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this language. This excludes the files that are common to all front
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ends. See <a href="Type-Information.html#Type-Information">Type Information</a>.
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</p>
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</dd>
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</dl>
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Next: <a href="Front-End-Makefile.html#Front-End-Makefile" accesskey="n" rel="next">Front End Makefile</a>, Previous: <a href="Front-End-Directory.html#Front-End-Directory" accesskey="p" rel="prev">Front End Directory</a>, Up: <a href="Front-End.html#Front-End" accesskey="u" rel="up">Front End</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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