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<title>Using the GNU Compiler Collection (GCC): Fixed Headers</title>
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<a name="Fixed-Headers"></a>
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Next: <a href="Standard-Libraries.html#Standard-Libraries" accesskey="n" rel="next">Standard Libraries</a>, Previous: <a href="Incompatibilities.html#Incompatibilities" accesskey="p" rel="prev">Incompatibilities</a>, Up: <a href="Trouble.html#Trouble" accesskey="u" rel="up">Trouble</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="Fixed-Header-Files"></a>
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<h3 class="section">13.4 Fixed Header Files</h3>
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<p>GCC needs to install corrected versions of some system header files.
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This is because most target systems have some header files that won’t
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work with GCC unless they are changed. Some have bugs, some are
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incompatible with ISO C, and some depend on special features of other
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compilers.
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</p>
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<p>Installing GCC automatically creates and installs the fixed header
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files, by running a program called <code>fixincludes</code>. Normally, you
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don’t need to pay attention to this. But there are cases where it
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doesn’t do the right thing automatically.
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</p>
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<ul>
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<li> If you update the system’s header files, such as by installing a new
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system version, the fixed header files of GCC are not automatically
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updated. They can be updated using the <code>mkheaders</code> script
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installed in
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<samp><var>libexecdir</var>/gcc/<var>target</var>/<var>version</var>/install-tools/</samp>.
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</li><li> On some systems, header file directories contain
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machine-specific symbolic links in certain places. This makes it
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possible to share most of the header files among hosts running the
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same version of the system on different machine models.
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<p>The programs that fix the header files do not understand this special
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way of using symbolic links; therefore, the directory of fixed header
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files is good only for the machine model used to build it.
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</p>
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<p>It is possible to make separate sets of fixed header files for the
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different machine models, and arrange a structure of symbolic links so
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as to use the proper set, but you’ll have to do this by hand.
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</p></li></ul>
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