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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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| <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 |
| Java front end depends on the C++ front end, so sets |
| ‘<samp>lang_requires=c++</samp>’. |
| </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 ‘<samp>subdir_requires="cp objc"</samp>’. |
| </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 ‘<samp>no</samp>’, 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 ‘<samp>yes</samp>’, 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 ‘<samp>\$(exeext)</samp>’. |
| </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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