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112 lines
5.1 KiB
HTML
112 lines
5.1 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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<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
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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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Invariant Sections being "Funding Free Software", the Front-Cover
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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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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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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>Fragments (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Fragments (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Fragments (GNU Compiler Collection (GCC) Internals)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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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="index.html#Top" rel="up" title="Top">
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<link href="Target-Fragment.html#Target-Fragment" rel="next" title="Target Fragment">
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<link href="Host-Misc.html#Host-Misc" rel="prev" title="Host Misc">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Fragments"></a>
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<div class="header">
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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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</div>
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<hr>
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<a name="Makefile-Fragments"></a>
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<h2 class="chapter">20 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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</td></tr>
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</table>
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</body>
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</html>
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