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