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91 lines
4.0 KiB
HTML
91 lines
4.0 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>Fixed Headers - Using the GNU Compiler Collection (GCC)</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Using the GNU Compiler Collection (GCC)">
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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="up" href="Trouble.html#Trouble" title="Trouble">
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<link rel="prev" href="Incompatibilities.html#Incompatibilities" title="Incompatibilities">
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<link rel="next" href="Standard-Libraries.html#Standard-Libraries" title="Standard Libraries">
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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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funds for GNU development.-->
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</head>
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<body>
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<div class="node">
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<a name="Fixed-Headers"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Standard-Libraries.html#Standard-Libraries">Standard Libraries</a>,
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Previous: <a rel="previous" accesskey="p" href="Incompatibilities.html#Incompatibilities">Incompatibilities</a>,
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Up: <a rel="up" accesskey="u" href="Trouble.html#Trouble">Trouble</a>
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<hr>
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</div>
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<h3 class="section">12.4 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>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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<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 <samp><span class="command">mkheaders</span></samp> script
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installed in
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<samp><var>libexecdir</var><span class="file">/gcc/</span><var>target</var><span class="file">/</span><var>version</var><span class="file">/install-tools/</span></samp>.
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<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>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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</ul>
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</body></html>
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