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<title>GNU Compiler Collection (GCC) Internals: Fragments</title>
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<a name="Fragments"></a>
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<p>
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Next: <a href="Collect2.html#Collect2" accesskey="n" rel="next">Collect2</a>, Previous: <a href="Host-Config.html#Host-Config" accesskey="p" rel="prev">Host Config</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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="Makefile-Fragments"></a>
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<h2 class="chapter">19 Makefile Fragments</h2>
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<a name="index-makefile-fragment"></a>
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<p>When you configure GCC using the <samp>configure</samp> script, it will
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construct the file <samp>Makefile</samp> from the template file
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<samp>Makefile.in</samp>. When it does this, it can incorporate makefile
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fragments from the <samp>config</samp> directory. These are used to set
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Makefile parameters that are not amenable to being calculated by
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autoconf. The list of fragments to incorporate is set by
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<samp>config.gcc</samp> (and occasionally <samp>config.build</samp>
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and <samp>config.host</samp>); See <a href="System-Config.html#System-Config">System Config</a>.
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</p>
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<p>Fragments are named either <samp>t-<var>target</var></samp> or <samp>x-<var>host</var></samp>,
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depending on whether they are relevant to configuring GCC to produce
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code for a particular target, or to configuring GCC to run on a
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particular host. Here <var>target</var> and <var>host</var> are mnemonics
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which usually have some relationship to the canonical system name, but
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no formal connection.
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</p>
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<p>If these files do not exist, it means nothing needs to be added for a
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given target or host. Most targets need a few <samp>t-<var>target</var></samp>
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fragments, but needing <samp>x-<var>host</var></samp> fragments is rare.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Target-Fragment.html#Target-Fragment" accesskey="1">Target Fragment</a>:</td><td> </td><td align="left" valign="top">Writing <samp>t-<var>target</var></samp> files.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Host-Fragment.html#Host-Fragment" accesskey="2">Host Fragment</a>:</td><td> </td><td align="left" valign="top">Writing <samp>x-<var>host</var></samp> files.
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