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104 lines
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<a name="Front-End-Config"></a>
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Next: <a rel="next" accesskey="n" href="Front-End-Makefile.html#Front-End-Makefile">Front End Makefile</a>,
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Previous: <a rel="previous" accesskey="p" href="Front-End-Directory.html#Front-End-Directory">Front End Directory</a>,
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Up: <a rel="up" accesskey="u" href="Front-End.html#Front-End">Front End</a>
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<h5 class="subsubsection">6.3.8.2 The Front End <samp><span class="file">config-lang.in</span></samp> File</h5>
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<p>Each language subdirectory contains a <samp><span class="file">config-lang.in</span></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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<dl>
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<dt><code>language</code><dd>This definition must be present, and gives the name of the language
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for some purposes such as arguments to <samp><span class="option">--enable-languages</span></samp>.
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<br><dt><code>lang_requires</code><dd>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><span class="samp">lang_requires=c++</span></samp>’.
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<br><dt><code>subdir_requires</code><dd>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><span class="samp">subdir_requires="cp objc"</span></samp>’.
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<br><dt><code>target_libs</code><dd>If defined, this variable lists (space-separated) targets in the top
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level <samp><span class="file">Makefile</span></samp> to build the runtime libraries for this
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language, such as <code>target-libobjc</code>.
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<br><dt><code>lang_dirs</code><dd>If defined, this variable lists (space-separated) top level
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directories (parallel to <samp><span class="file">gcc</span></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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<br><dt><code>build_by_default</code><dd>If defined to ‘<samp><span class="samp">no</span></samp>’, this language front end is not built unless
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enabled in a <samp><span class="option">--enable-languages</span></samp> argument. Otherwise, front
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ends are built by default, subject to any special logic in
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<samp><span class="file">configure.ac</span></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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<br><dt><code>boot_language</code><dd>If defined to ‘<samp><span class="samp">yes</span></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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<br><dt><code>compilers</code><dd>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><span class="samp">\$(exeext)</span></samp>’.
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<br><dt><code>outputs</code><dd>If defined, a space-separated list of files that should be generated
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by <samp><span class="file">configure</span></samp> substituting values in them. This mechanism can
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be used to create a file <samp><var>language</var><span class="file">/Makefile</span></samp> from
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<samp><var>language</var><span class="file">/Makefile.in</span></samp>, but this is deprecated, building
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everything from the single <samp><span class="file">gcc/Makefile</span></samp> is preferred.
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<br><dt><code>gtfiles</code><dd>If defined, a space-separated list of files that should be scanned by
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<samp><span class="file">gengtype.c</span></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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</dl>
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</body></html>
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