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154 lines
7.2 KiB
HTML
154 lines
7.2 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Front End Config (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Front End Config (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Front End Config (GNU Compiler Collection (GCC) Internals)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Front-End.html#Front-End" rel="up" title="Front End">
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<link href="Front-End-Makefile.html#Front-End-Makefile" rel="next" title="Front End Makefile">
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</head>
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<body lang="en">
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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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</div>
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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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Obj-C++ front end depends on the C++ and ObjC front ends, so sets
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‘<samp>lang_requires="objc 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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<hr>
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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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</div>
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</body>
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</html>
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