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78 lines
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<title>System Config - GNU Compiler Collection (GCC) Internals</title>
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Next: <a rel="next" accesskey="n" href="Configuration-Files.html#Configuration-Files">Configuration Files</a>,
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<h5 class="subsubsection">6.3.2.2 The <samp><span class="file">config.build</span></samp>; <samp><span class="file">config.host</span></samp>; and <samp><span class="file">config.gcc</span></samp> Files</h5>
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<p>The <samp><span class="file">config.build</span></samp> file contains specific rules for particular systems
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which GCC is built on. This should be used as rarely as possible, as the
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behavior of the build system can always be detected by autoconf.
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<p>The <samp><span class="file">config.host</span></samp> file contains specific rules for particular systems
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which GCC will run on. This is rarely needed.
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<p>The <samp><span class="file">config.gcc</span></samp> file contains specific rules for particular systems
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which GCC will generate code for. This is usually needed.
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<p>Each file has a list of the shell variables it sets, with descriptions, at the
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top of the file.
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<p>FIXME: document the contents of these files, and what variables should
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be set to control build, host and target configuration.
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