You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
116 lines
5.0 KiB
HTML
116 lines
5.0 KiB
HTML
4 years ago
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
|
|
<html>
|
||
|
|
<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
Permission is granted to copy, distribute and/or modify this document
|
||
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
||
|
|
any later version published by the Free Software Foundation; with the
|
||
|
|
Invariant Sections being "Funding Free Software", the Front-Cover
|
||
|
|
Texts being (a) (see below), and with the Back-Cover Texts being (b)
|
||
|
|
(see below). A copy of the license is included in the section entitled
|
||
|
|
"GNU Free Documentation License".
|
||
|
|
|
||
|
|
(a) The FSF's Front-Cover Text is:
|
||
|
|
|
||
|
|
A GNU Manual
|
||
|
|
|
||
|
|
(b) The FSF's Back-Cover Text is:
|
||
|
|
|
||
|
|
You have freedom to copy and modify this GNU Manual, like GNU
|
||
|
|
software. Copies published by the Free Software Foundation raise
|
||
|
|
funds for GNU development. -->
|
||
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<title>Fixed Headers (Using the GNU Compiler Collection (GCC))</title>
|
||
|
|
|
||
|
|
<meta name="description" content="Fixed Headers (Using the GNU Compiler Collection (GCC))">
|
||
|
|
<meta name="keywords" content="Fixed Headers (Using the GNU Compiler Collection (GCC))">
|
||
|
|
<meta name="resource-type" content="document">
|
||
|
|
<meta name="distribution" content="global">
|
||
|
|
<meta name="Generator" content="makeinfo">
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
||
|
|
<link href="index.html#Top" rel="start" title="Top">
|
||
|
|
<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
|
||
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
||
|
|
<link href="Trouble.html#Trouble" rel="up" title="Trouble">
|
||
|
|
<link href="Standard-Libraries.html#Standard-Libraries" rel="next" title="Standard Libraries">
|
||
|
|
<link href="Incompatibilities.html#Incompatibilities" rel="prev" title="Incompatibilities">
|
||
|
|
<style type="text/css">
|
||
|
|
<!--
|
||
|
|
a.summary-letter {text-decoration: none}
|
||
|
|
blockquote.indentedblock {margin-right: 0em}
|
||
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
||
|
|
blockquote.smallquotation {font-size: smaller}
|
||
|
|
div.display {margin-left: 3.2em}
|
||
|
|
div.example {margin-left: 3.2em}
|
||
|
|
div.lisp {margin-left: 3.2em}
|
||
|
|
div.smalldisplay {margin-left: 3.2em}
|
||
|
|
div.smallexample {margin-left: 3.2em}
|
||
|
|
div.smalllisp {margin-left: 3.2em}
|
||
|
|
kbd {font-style: oblique}
|
||
|
|
pre.display {font-family: inherit}
|
||
|
|
pre.format {font-family: inherit}
|
||
|
|
pre.menu-comment {font-family: serif}
|
||
|
|
pre.menu-preformatted {font-family: serif}
|
||
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smallexample {font-size: smaller}
|
||
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smalllisp {font-size: smaller}
|
||
|
|
span.nolinebreak {white-space: nowrap}
|
||
|
|
span.roman {font-family: initial; font-weight: normal}
|
||
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
||
|
|
ul.no-bullet {list-style: none}
|
||
|
|
-->
|
||
|
|
</style>
|
||
|
|
|
||
|
|
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body lang="en">
|
||
|
|
<a name="Fixed-Headers"></a>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
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>
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<a name="Fixed-Header-Files"></a>
|
||
|
|
<h3 class="section">13.4 Fixed Header Files</h3>
|
||
|
|
|
||
|
|
<p>GCC needs to install corrected versions of some system header files.
|
||
|
|
This is because most target systems have some header files that won’t
|
||
|
|
work with GCC unless they are changed. Some have bugs, some are
|
||
|
|
incompatible with ISO C, and some depend on special features of other
|
||
|
|
compilers.
|
||
|
|
</p>
|
||
|
|
<p>Installing GCC automatically creates and installs the fixed header
|
||
|
|
files, by running a program called <code>fixincludes</code>. Normally, you
|
||
|
|
don’t need to pay attention to this. But there are cases where it
|
||
|
|
doesn’t do the right thing automatically.
|
||
|
|
</p>
|
||
|
|
<ul>
|
||
|
|
<li> If you update the system’s header files, such as by installing a new
|
||
|
|
system version, the fixed header files of GCC are not automatically
|
||
|
|
updated. They can be updated using the <code>mkheaders</code> script
|
||
|
|
installed in
|
||
|
|
<samp><var>libexecdir</var>/gcc/<var>target</var>/<var>version</var>/install-tools/</samp>.
|
||
|
|
|
||
|
|
</li><li> On some systems, header file directories contain
|
||
|
|
machine-specific symbolic links in certain places. This makes it
|
||
|
|
possible to share most of the header files among hosts running the
|
||
|
|
same version of the system on different machine models.
|
||
|
|
|
||
|
|
<p>The programs that fix the header files do not understand this special
|
||
|
|
way of using symbolic links; therefore, the directory of fixed header
|
||
|
|
files is good only for the machine model used to build it.
|
||
|
|
</p>
|
||
|
|
<p>It is possible to make separate sets of fixed header files for the
|
||
|
|
different machine models, and arrange a structure of symbolic links so
|
||
|
|
as to use the proper set, but you’ll have to do this by hand.
|
||
|
|
</p></li></ul>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|