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79 lines
3.7 KiB
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<title>Host Config - GNU Compiler Collection (GCC) Internals</title>
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Copyright (C) 1988-2015 Free Software Foundation, Inc.
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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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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</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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