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108 lines
4.9 KiB
HTML
108 lines
4.9 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 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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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Host Config (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Host Config (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Host Config (GNU Compiler Collection (GCC) Internals)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="index.html#Top" rel="up" title="Top">
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<link href="Host-Common.html#Host-Common" rel="next" title="Host Common">
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<link href="Misc.html#Misc" rel="prev" title="Misc">
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<style type="text/css">
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Host-Config"></a>
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<div class="header">
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<p>
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Next: <a href="Fragments.html#Fragments" accesskey="n" rel="next">Fragments</a>, Previous: <a href="Target-Macros.html#Target-Macros" accesskey="p" rel="prev">Target Macros</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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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</div>
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<hr>
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<a name="Host-Configuration"></a>
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<h2 class="chapter">19 Host Configuration</h2>
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<a name="index-host-configuration"></a>
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<p>Most details about the machine and system on which the compiler is
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actually running are detected by the <code>configure</code> script. Some
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things are impossible for <code>configure</code> 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>xm-<var>machine</var>.h</samp> or by hook functions in the file specified
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by the <var>out_host_hook_obj</var> variable in <samp>config.gcc</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>
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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>config.gcc</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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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Host-Common.html#Host-Common" accesskey="1">Host Common</a>:</td><td> </td><td align="left" valign="top">Things every host probably needs implemented.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Filesystem.html#Filesystem" accesskey="2">Filesystem</a>:</td><td> </td><td align="left" valign="top">Your host cannot have the letter ‘a’ in filenames?
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Host-Misc.html#Host-Misc" accesskey="3">Host Misc</a>:</td><td> </td><td align="left" valign="top">Rare configuration options for hosts.
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</td></tr>
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</table>
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</body>
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</html>
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