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<title>GNU Compiler Collection (GCC) Internals: Front End</title>
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<p>
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Next: <a href="Back-End.html#Back-End" accesskey="n" rel="next">Back End</a>, Previous: <a href="Documentation.html#Documentation" accesskey="p" rel="prev">Documentation</a>, Up: <a href="gcc-Directory.html#gcc-Directory" accesskey="u" rel="up">gcc Directory</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="Anatomy-of-a-Language-Front-End"></a>
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<h4 class="subsection">6.3.8 Anatomy of a Language Front End</h4>
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<p>A front end for a language in GCC has the following parts:
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</p>
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<ul>
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<li> A directory <samp><var>language</var></samp> under <samp>gcc</samp> containing source
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files for that front end. See <a href="Front-End-Directory.html#Front-End-Directory">The Front End
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<samp><var>language</var></samp> Directory</a>, for details.
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</li><li> A mention of the language in the list of supported languages in
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<samp>gcc/doc/install.texi</samp>.
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</li><li> A mention of the name under which the language’s runtime library is
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recognized by <samp>--enable-shared=<var>package</var></samp> in the
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documentation of that option in <samp>gcc/doc/install.texi</samp>.
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</li><li> A mention of any special prerequisites for building the front end in
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the documentation of prerequisites in <samp>gcc/doc/install.texi</samp>.
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</li><li> Details of contributors to that front end in
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<samp>gcc/doc/contrib.texi</samp>. If the details are in that front end’s
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own manual then there should be a link to that manual’s list in
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<samp>contrib.texi</samp>.
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</li><li> Information about support for that language in
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<samp>gcc/doc/frontends.texi</samp>.
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</li><li> Information about standards for that language, and the front end’s
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support for them, in <samp>gcc/doc/standards.texi</samp>. This may be a
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link to such information in the front end’s own manual.
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</li><li> Details of source file suffixes for that language and <samp>-x
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<var>lang</var></samp> options supported, in <samp>gcc/doc/invoke.texi</samp>.
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</li><li> Entries in <code>default_compilers</code> in <samp>gcc.c</samp> for source file
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suffixes for that language.
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</li><li> Preferably testsuites, which may be under <samp>gcc/testsuite</samp> or
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runtime library directories. FIXME: document somewhere how to write
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testsuite harnesses.
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</li><li> Probably a runtime library for the language, outside the <samp>gcc</samp>
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directory. FIXME: document this further.
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</li><li> Details of the directories of any runtime libraries in
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<samp>gcc/doc/sourcebuild.texi</samp>.
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</li><li> Check targets in <samp>Makefile.def</samp> for the top-level <samp>Makefile</samp>
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to check just the compiler or the compiler and runtime library for the
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language.
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</li></ul>
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<p>If the front end is added to the official GCC source repository, the
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following are also necessary:
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</p>
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<ul>
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<li> At least one Bugzilla component for bugs in that front end and runtime
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libraries. This category needs to be added to the Bugzilla database.
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</li><li> Normally, one or more maintainers of that front end listed in
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<samp>MAINTAINERS</samp>.
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</li><li> Mentions on the GCC web site in <samp>index.html</samp> and
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<samp>frontends.html</samp>, with any relevant links on
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<samp>readings.html</samp>. (Front ends that are not an official part of
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GCC may also be listed on <samp>frontends.html</samp>, with relevant links.)
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</li><li> A news item on <samp>index.html</samp>, and possibly an announcement on the
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<a href="mailto:gcc-announce@gcc.gnu.org">gcc-announce@gcc.gnu.org</a> mailing list.
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</li><li> The front end’s manuals should be mentioned in
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<samp>maintainer-scripts/update_web_docs_svn</samp> (see <a href="Texinfo-Manuals.html#Texinfo-Manuals">Texinfo Manuals</a>)
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and the online manuals should be linked to from
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<samp>onlinedocs/index.html</samp>.
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</li><li> Any old releases or CVS repositories of the front end, before its
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inclusion in GCC, should be made available on the GCC FTP site
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<a href="ftp://gcc.gnu.org/pub/gcc/old-releases/">ftp://gcc.gnu.org/pub/gcc/old-releases/</a>.
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</li><li> The release and snapshot script <samp>maintainer-scripts/gcc_release</samp>
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should be updated to generate appropriate tarballs for this front end.
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</li><li> If this front end includes its own version files that include the
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current date, <samp>maintainer-scripts/update_version</samp> should be
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updated accordingly.
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</li></ul>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Front-End-Directory.html#Front-End-Directory" accesskey="1">Front End Directory</a>:</td><td> </td><td align="left" valign="top">The front end <samp><var>language</var></samp> directory.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Front-End-Config.html#Front-End-Config" accesskey="2">Front End Config</a>:</td><td> </td><td align="left" valign="top">The front end <samp>config-lang.in</samp> file.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Front-End-Makefile.html#Front-End-Makefile" accesskey="3">Front End Makefile</a>:</td><td> </td><td align="left" valign="top">The front end <samp>Make-lang.in</samp> file.
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</td></tr>
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</table>
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<div class="header">
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<p>
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Next: <a href="Back-End.html#Back-End" accesskey="n" rel="next">Back End</a>, Previous: <a href="Documentation.html#Documentation" accesskey="p" rel="prev">Documentation</a>, Up: <a href="gcc-Directory.html#gcc-Directory" accesskey="u" rel="up">gcc Directory</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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