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142 lines
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142 lines
7.4 KiB
HTML
<!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>Notes for Package Builds (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="Notes for Package Builds (GNU MP 6.1.0)">
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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="Installing-GMP.html#Installing-GMP" rel="up" title="Installing GMP">
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<link href="Notes-for-Particular-Systems.html#Notes-for-Particular-Systems" rel="next" title="Notes for Particular Systems">
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<link href="ABI-and-ISA.html#ABI-and-ISA" rel="prev" title="ABI and ISA">
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</head>
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<body lang="en">
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<a name="Notes-for-Package-Builds"></a>
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<div class="header">
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<p>
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Next: <a href="Notes-for-Particular-Systems.html#Notes-for-Particular-Systems" accesskey="n" rel="next">Notes for Particular Systems</a>, Previous: <a href="ABI-and-ISA.html#ABI-and-ISA" accesskey="p" rel="prev">ABI and ISA</a>, Up: <a href="Installing-GMP.html#Installing-GMP" accesskey="u" rel="up">Installing GMP</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="Notes-for-Package-Builds-1"></a>
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<h3 class="section">2.3 Notes for Package Builds</h3>
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<a name="index-Build-notes-for-binary-packaging"></a>
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<a name="index-Packaged-builds"></a>
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<p>GMP should present no great difficulties for packaging in a binary
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distribution.
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</p>
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<a name="index-Libtool-versioning"></a>
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<a name="index-Shared-library-versioning"></a>
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<p>Libtool is used to build the library and ‘<samp>-version-info</samp>’ is set
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appropriately, having started from ‘<samp>3:0:0</samp>’ in GMP 3.0 (see <a href="http://www.gnu.org/software/libtool/manual/html_node/Versioning.html#Versioning">Library interface versions</a> in <cite>GNU
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Libtool</cite>).
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</p>
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<p>The GMP 4 series will be upwardly binary compatible in each release and will
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be upwardly binary compatible with all of the GMP 3 series. Additional
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function interfaces may be added in each release, so on systems where libtool
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versioning is not fully checked by the loader an auxiliary mechanism may be
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needed to express that a dynamic linked application depends on a new enough
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GMP.
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</p>
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<p>An auxiliary mechanism may also be needed to express that <samp>libgmpxx.la</samp>
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(from <samp>--enable-cxx</samp>, see <a href="Build-Options.html#Build-Options">Build Options</a>) requires <samp>libgmp.la</samp>
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from the same GMP version, since this is not done by the libtool versioning,
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nor otherwise. A mismatch will result in unresolved symbols from the linker,
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or perhaps the loader.
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</p>
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<p>When building a package for a CPU family, care should be taken to use
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‘<samp>--host</samp>’ (or ‘<samp>--build</samp>’) to choose the least common denominator among
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the CPUs which might use the package. For example this might mean plain
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‘<samp>sparc</samp>’ (meaning V7) for SPARCs.
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</p>
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<p>For x86s, <samp>--enable-fat</samp> sets things up for a fat binary build, making a
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runtime selection of optimized low level routines. This is a good choice for
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packaging to run on a range of x86 chips.
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</p>
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<p>Users who care about speed will want GMP built for their exact CPU type, to
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make best use of the available optimizations. Providing a way to suitably
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rebuild a package may be useful. This could be as simple as making it
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possible for a user to omit ‘<samp>--build</samp>’ (and ‘<samp>--host</samp>’) so
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‘<samp>./config.guess</samp>’ will detect the CPU. But a way to manually specify a
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‘<samp>--build</samp>’ will be wanted for systems where ‘<samp>./config.guess</samp>’ is
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inexact.
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</p>
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<p>On systems with multiple ABIs, a packaged build will need to decide which
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among the choices is to be provided, see <a href="ABI-and-ISA.html#ABI-and-ISA">ABI and ISA</a>. A given run of
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‘<samp>./configure</samp>’ etc will only build one ABI. If a second ABI is also
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required then a second run of ‘<samp>./configure</samp>’ etc must be made, starting
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from a clean directory tree (‘<samp>make distclean</samp>’).
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</p>
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<p>As noted under “ABI and ISA”, currently no attempt is made to follow system
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conventions for install locations that vary with ABI, such as
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<samp>/usr/lib/sparcv9</samp> for ‘<samp>ABI=64</samp>’ as opposed to <samp>/usr/lib</samp> for
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‘<samp>ABI=32</samp>’. A package build can override ‘<samp>libdir</samp>’ and other standard
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variables as necessary.
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</p>
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<p>Note that <samp>gmp.h</samp> is a generated file, and will be architecture and ABI
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dependent. When attempting to install two ABIs simultaneously it will be
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important that an application compile gets the correct <samp>gmp.h</samp> for its
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desired ABI. If compiler include paths don’t vary with ABI options then it
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might be necessary to create a <samp>/usr/include/gmp.h</samp> which tests
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preprocessor symbols and chooses the correct actual <samp>gmp.h</samp>.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Notes-for-Particular-Systems.html#Notes-for-Particular-Systems" accesskey="n" rel="next">Notes for Particular Systems</a>, Previous: <a href="ABI-and-ISA.html#ABI-and-ISA" accesskey="p" rel="prev">ABI and ISA</a>, Up: <a href="Installing-GMP.html#Installing-GMP" accesskey="u" rel="up">Installing GMP</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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