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130 lines
5.4 KiB
HTML
130 lines
5.4 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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<!-- This manual describes how to install and use the GNU multiple precision
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arithmetic library, version 6.1.0.
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Copyright 1991, 1993-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document under
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the terms of the GNU Free Documentation License, Version 1.3 or any later
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version published by the Free Software Foundation; with no Invariant Sections,
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with the Front-Cover Texts being "A GNU Manual", and with the Back-Cover
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Texts being "You have freedom to copy and modify this GNU Manual, like GNU
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software". A copy of the license is included in
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GNU Free Documentation License. -->
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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>Autoconf (GNU MP 6.1.0)</title>
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<meta name="description" content="How to install and use the GNU multiple precision arithmetic library, version 6.1.0.">
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<meta name="keywords" content="Autoconf (GNU MP 6.1.0)">
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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=iso-8859-1">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="GMP-Basics.html#GMP-Basics" rel="up" title="GMP Basics">
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<link href="Emacs.html#Emacs" rel="next" title="Emacs">
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<link href="Profiling.html#Profiling" rel="prev" title="Profiling">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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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="Autoconf"></a>
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<div class="header">
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<p>
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Next: <a href="Emacs.html#Emacs" accesskey="n" rel="next">Emacs</a>, Previous: <a href="Profiling.html#Profiling" accesskey="p" rel="prev">Profiling</a>, Up: <a href="GMP-Basics.html#GMP-Basics" accesskey="u" rel="up">GMP Basics</a> [<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Autoconf-1"></a>
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<h3 class="section">3.14 Autoconf</h3>
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<a name="index-Autoconf"></a>
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<p>Autoconf based applications can easily check whether GMP is installed. The
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only thing to be noted is that GMP library symbols from version 3 onwards have
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prefixes like <code>__gmpz</code>. The following therefore would be a simple test,
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</p>
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<a name="index-AC_005fCHECK_005fLIB"></a>
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<div class="example">
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<pre class="example">AC_CHECK_LIB(gmp, __gmpz_init)
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</pre></div>
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<p>This just uses the default <code>AC_CHECK_LIB</code> actions for found or not found,
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but an application that must have GMP would want to generate an error if not
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found. For example,
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</p>
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<div class="example">
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<pre class="example">AC_CHECK_LIB(gmp, __gmpz_init, ,
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[AC_MSG_ERROR([GNU MP not found, see https://gmplib.org/])])
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</pre></div>
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<p>If functions added in some particular version of GMP are required, then one of
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those can be used when checking. For example <code>mpz_mul_si</code> was added in
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GMP 3.1,
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</p>
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<div class="example">
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<pre class="example">AC_CHECK_LIB(gmp, __gmpz_mul_si, ,
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[AC_MSG_ERROR(
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[GNU MP not found, or not 3.1 or up, see https://gmplib.org/])])
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</pre></div>
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<p>An alternative would be to test the version number in <samp>gmp.h</samp> using say
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<code>AC_EGREP_CPP</code>. That would make it possible to test the exact version,
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if some particular sub-minor release is known to be necessary.
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</p>
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<p>In general it’s recommended that applications should simply demand a new
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enough GMP rather than trying to provide supplements for features not
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available in past versions.
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</p>
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<p>Occasionally an application will need or want to know the size of a type at
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configuration or preprocessing time, not just with <code>sizeof</code> in the code.
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This can be done in the normal way with <code>mp_limb_t</code> etc, but GMP 4.0 or
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up is best for this, since prior versions needed certain ‘<samp>-D</samp>’ defines on
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systems using a <code>long long</code> limb. The following would suit Autoconf 2.50
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or up,
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</p>
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<div class="example">
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<pre class="example">AC_CHECK_SIZEOF(mp_limb_t, , [#include <gmp.h>])
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</pre></div>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Emacs.html#Emacs" accesskey="n" rel="next">Emacs</a>, Previous: <a href="Profiling.html#Profiling" accesskey="p" rel="prev">Profiling</a>, Up: <a href="GMP-Basics.html#GMP-Basics" accesskey="u" rel="up">GMP Basics</a> [<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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