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79 lines
3.7 KiB
HTML
79 lines
3.7 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>Host Config - GNU Compiler Collection (GCC) Internals</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="GNU Compiler Collection (GCC) Internals">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="prev" href="Target-Macros.html#Target-Macros" title="Target Macros">
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<link rel="next" href="Fragments.html#Fragments" title="Fragments">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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Copyright (C) 1988-2015 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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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Host-Config"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Fragments.html#Fragments">Fragments</a>,
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Previous: <a rel="previous" accesskey="p" href="Target-Macros.html#Target-Macros">Target Macros</a>,
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Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
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<hr>
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</div>
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<h2 class="chapter">18 Host Configuration</h2>
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<p><a name="index-host-configuration-5021"></a>
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Most details about the machine and system on which the compiler is
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actually running are detected by the <samp><span class="command">configure</span></samp> script. Some
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things are impossible for <samp><span class="command">configure</span></samp> to detect; these are
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described in two ways, either by macros defined in a file named
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<samp><span class="file">xm-</span><var>machine</var><span class="file">.h</span></samp> or by hook functions in the file specified
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by the <var>out_host_hook_obj</var> variable in <samp><span class="file">config.gcc</span></samp>. (The
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intention is that very few hosts will need a header file but nearly
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every fully supported host will need to override some hooks.)
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<p>If you need to define only a few macros, and they have simple
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definitions, consider using the <code>xm_defines</code> variable in your
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<samp><span class="file">config.gcc</span></samp> entry instead of creating a host configuration
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header. See <a href="System-Config.html#System-Config">System Config</a>.
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<ul class="menu">
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<li><a accesskey="1" href="Host-Common.html#Host-Common">Host Common</a>: Things every host probably needs implemented.
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<li><a accesskey="2" href="Filesystem.html#Filesystem">Filesystem</a>: Your host can't have the letter `a' in filenames?
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<li><a accesskey="3" href="Host-Misc.html#Host-Misc">Host Misc</a>: Rare configuration options for hosts.
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</ul>
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</body></html>
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