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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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<head>
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<title>Notes for Particular Systems (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 Particular Systems (GNU MP 6.1.0)">
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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="Known-Build-Problems.html#Known-Build-Problems" rel="next" title="Known Build Problems">
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</head>
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<body lang="en">
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<a name="Notes-for-Particular-Systems"></a>
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<div class="header">
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<p>
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Next: <a href="Known-Build-Problems.html#Known-Build-Problems" accesskey="n" rel="next">Known Build Problems</a>, Previous: <a href="Notes-for-Package-Builds.html#Notes-for-Package-Builds" accesskey="p" rel="prev">Notes for Package Builds</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-Particular-Systems-1"></a>
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<h3 class="section">2.4 Notes for Particular Systems</h3>
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<a name="index-Build-notes-for-particular-systems"></a>
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<a name="index-Particular-systems"></a>
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<a name="index-Systems"></a>
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<dl compact="compact">
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<dt>AIX 3 and 4</dt>
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<dd><a name="index-AIX-1"></a>
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<p>On systems ‘<samp>*-*-aix[34]*</samp>’ shared libraries are disabled by default, since
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some versions of the native <code>ar</code> fail on the convenience libraries
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used. A shared build can be attempted with
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</p>
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<div class="example">
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<pre class="example">./configure --enable-shared --disable-static
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</pre></div>
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<p>Note that the ‘<samp>--disable-static</samp>’ is necessary because in a shared build
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libtool makes <samp>libgmp.a</samp> a symlink to <samp>libgmp.so</samp>, apparently for
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the benefit of old versions of <code>ld</code> which only recognise <samp>.a</samp>,
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but unfortunately this is done even if a fully functional <code>ld</code> is
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available.
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</p>
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</dd>
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<dt>ARM</dt>
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<dd><a name="index-ARM"></a>
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<p>On systems ‘<samp>arm*-*-*</samp>’, versions of GCC up to and including 2.95.3 have a
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bug in unsigned division, giving wrong results for some operands. GMP
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‘<samp>./configure</samp>’ will demand GCC 2.95.4 or later.
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</p>
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</dd>
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<dt>Compaq C++</dt>
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<dd><a name="index-Compaq-C_002b_002b"></a>
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<p>Compaq C++ on OSF 5.1 has two flavours of <code>iostream</code>, a standard one and
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an old pre-standard one (see ‘<samp>man iostream_intro</samp>’). GMP can only use the
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standard one, which unfortunately is not the default but must be selected by
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defining <code>__USE_STD_IOSTREAM</code>. Configure with for instance
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</p>
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<div class="example">
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<pre class="example">./configure --enable-cxx CPPFLAGS=-D__USE_STD_IOSTREAM
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</pre></div>
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</dd>
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<dt>Floating Point Mode</dt>
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<dd><a name="index-Floating-point-mode"></a>
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<a name="index-Hardware-floating-point-mode"></a>
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<a name="index-Precision-of-hardware-floating-point"></a>
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<a name="index-x87"></a>
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<p>On some systems, the hardware floating point has a control mode which can set
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all operations to be done in a particular precision, for instance single,
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double or extended on x86 systems (x87 floating point). The GMP functions
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involving a <code>double</code> cannot be expected to operate to their full
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precision when the hardware is in single precision mode. Of course this
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affects all code, including application code, not just GMP.
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</p>
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</dd>
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<dt>FreeBSD 7.x, 8.x, 9.0, 9.1, 9.2</dt>
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<dd><a name="index-FreeBSD"></a>
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<p><code>m4</code> in these releases of FreeBSD has an eval function which ignores
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its 2nd and 3rd arguments, which makes it unsuitable for <samp>.asm</samp> file
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processing. ‘<samp>./configure</samp>’ will detect the problem and either abort or
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choose another m4 in the <code>PATH</code>. The bug is fixed in FreeBSD 9.3 and 10.0,
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so either upgrade or use GNU m4. Note that the FreeBSD package system installs
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GNU m4 under the name ‘<samp>gm4</samp>’, which GMP cannot guess.
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</p>
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</dd>
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<dt>FreeBSD 7.x, 8.x, 9.x</dt>
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<dd><a name="index-FreeBSD-1"></a>
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<p>GMP releases starting with 6.0 do not support ‘<samp>ABI=32</samp>’ on FreeBSD/amd64
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prior to release 10.0 of the system. The cause is a broken <code>limits.h</code>,
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which GMP no longer works around.
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</p>
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</dd>
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<dt>MS-DOS and MS Windows</dt>
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<dd><a name="index-MS_002dDOS"></a>
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<a name="index-MS-Windows"></a>
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<a name="index-Windows"></a>
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<a name="index-Cygwin"></a>
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<a name="index-DJGPP"></a>
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<a name="index-MINGW"></a>
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<p>On an MS-DOS system DJGPP can be used to build GMP, and on an MS Windows
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system Cygwin, DJGPP and MINGW can be used. All three are excellent ports of
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GCC and the various GNU tools.
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</p>
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<div class="display">
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<pre class="display"><a href="http://www.cygwin.com/">http://www.cygwin.com/</a>
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<a href="http://www.delorie.com/djgpp/">http://www.delorie.com/djgpp/</a>
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<a href="http://www.mingw.org/">http://www.mingw.org/</a>
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</pre></div>
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<a name="index-Interix"></a>
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<a name="index-Services-for-Unix"></a>
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<p>Microsoft also publishes an Interix “Services for Unix” which can be used to
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build GMP on Windows (with a normal ‘<samp>./configure</samp>’), but it’s not free
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software.
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</p>
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</dd>
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<dt>MS Windows DLLs</dt>
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<dd><a name="index-DLLs"></a>
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<a name="index-MS-Windows-1"></a>
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<a name="index-Windows-1"></a>
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<p>On systems ‘<samp>*-*-cygwin*</samp>’, ‘<samp>*-*-mingw*</samp>’ and ‘<samp>*-*-pw32*</samp>’ by
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default GMP builds only a static library, but a DLL can be built instead using
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</p>
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<div class="example">
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<pre class="example">./configure --disable-static --enable-shared
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</pre></div>
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<p>Static and DLL libraries can’t both be built, since certain export directives
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in <samp>gmp.h</samp> must be different.
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</p>
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<p>A MINGW DLL build of GMP can be used with Microsoft C. Libtool doesn’t
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install a <samp>.lib</samp> format import library, but it can be created with MS
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<code>lib</code> as follows, and copied to the install directory. Similarly for
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<samp>libmp</samp> and <samp>libgmpxx</samp>.
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</p>
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<div class="example">
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<pre class="example">cd .libs
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lib /def:libgmp-3.dll.def /out:libgmp-3.lib
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</pre></div>
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<p>MINGW uses the C runtime library ‘<samp>msvcrt.dll</samp>’ for I/O, so applications
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wanting to use the GMP I/O routines must be compiled with ‘<samp>cl /MD</samp>’ to do
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the same. If one of the other C runtime library choices provided by MS C is
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desired then the suggestion is to use the GMP string functions and confine I/O
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to the application.
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</p>
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</dd>
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<dt>Motorola 68k CPU Types</dt>
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<dd><a name="index-68000"></a>
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<p>‘<samp>m68k</samp>’ is taken to mean 68000. ‘<samp>m68020</samp>’ or higher will give a
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performance boost on applicable CPUs. ‘<samp>m68360</samp>’ can be used for CPU32
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series chips. ‘<samp>m68302</samp>’ can be used for “Dragonball” series chips,
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though this is merely a synonym for ‘<samp>m68000</samp>’.
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</p>
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</dd>
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<dt>NetBSD 5.x</dt>
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<dd><a name="index-NetBSD"></a>
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<p><code>m4</code> in these releases of NetBSD has an eval function which ignores its
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2nd and 3rd arguments, which makes it unsuitable for <samp>.asm</samp> file
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processing. ‘<samp>./configure</samp>’ will detect the problem and either abort or
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choose another m4 in the <code>PATH</code>. The bug is fixed in NetBSD 6, so either
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upgrade or use GNU m4. Note that the NetBSD package system installs GNU m4
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under the name ‘<samp>gm4</samp>’, which GMP cannot guess.
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</p>
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</dd>
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<dt>OpenBSD 2.6</dt>
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<dd><a name="index-OpenBSD"></a>
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<p><code>m4</code> in this release of OpenBSD has a bug in <code>eval</code> that makes it
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unsuitable for <samp>.asm</samp> file processing. ‘<samp>./configure</samp>’ will detect
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the problem and either abort or choose another m4 in the <code>PATH</code>. The bug
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is fixed in OpenBSD 2.7, so either upgrade or use GNU m4.
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</p>
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</dd>
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<dt>Power CPU Types</dt>
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<dd><a name="index-Power_002fPowerPC"></a>
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<p>In GMP, CPU types ‘<samp>power*</samp>’ and ‘<samp>powerpc*</samp>’ will each use instructions
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not available on the other, so it’s important to choose the right one for the
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CPU that will be used. Currently GMP has no assembly code support for using
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just the common instruction subset. To get executables that run on both, the
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current suggestion is to use the generic C code (<samp>--disable-assembly</samp>),
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possibly with appropriate compiler options (like ‘<samp>-mcpu=common</samp>’ for
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<code>gcc</code>). CPU ‘<samp>rs6000</samp>’ (which is not a CPU but a family of
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workstations) is accepted by <samp>config.sub</samp>, but is currently equivalent to
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<samp>--disable-assembly</samp>.
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</p>
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</dd>
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<dt>Sparc CPU Types</dt>
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<dd><a name="index-Sparc"></a>
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<p>‘<samp>sparcv8</samp>’ or ‘<samp>supersparc</samp>’ on relevant systems will give a
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significant performance increase over the V7 code selected by plain
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‘<samp>sparc</samp>’.
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</p>
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</dd>
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<dt>Sparc App Regs</dt>
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<dd><a name="index-Sparc-1"></a>
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<p>The GMP assembly code for both 32-bit and 64-bit Sparc clobbers the
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“application registers” <code>g2</code>, <code>g3</code> and <code>g4</code>, the same way
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that the GCC default ‘<samp>-mapp-regs</samp>’ does (see <a href="http://gcc.gnu.org/onlinedocs/gcc/SPARC-Options.html#SPARC-Options">SPARC
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Options</a> in <cite>Using the GNU Compiler Collection (GCC)</cite>).
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</p>
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<p>This makes that code unsuitable for use with the special V9
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‘<samp>-mcmodel=embmedany</samp>’ (which uses <code>g4</code> as a data segment pointer), and
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for applications wanting to use those registers for special purposes. In these
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cases the only suggestion currently is to build GMP with
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<samp>--disable-assembly</samp> to avoid the assembly code.
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</p>
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</dd>
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<dt>SunOS 4</dt>
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<dd><a name="index-SunOS"></a>
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<p><code>/usr/bin/m4</code> lacks various features needed to process <samp>.asm</samp>
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files, and instead ‘<samp>./configure</samp>’ will automatically use
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<code>/usr/5bin/m4</code>, which we believe is always available (if not then use
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GNU m4).
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</p>
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</dd>
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<dt>x86 CPU Types</dt>
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<dd><a name="index-x86"></a>
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<a name="index-80x86"></a>
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<a name="index-i386"></a>
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<p>‘<samp>i586</samp>’, ‘<samp>pentium</samp>’ or ‘<samp>pentiummmx</samp>’ code is good for its intended
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P5 Pentium chips, but quite slow when run on Intel P6 class chips (PPro, P-II,
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P-III). ‘<samp>i386</samp>’ is a better choice when making binaries that must run on
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both.
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</p>
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</dd>
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<dt>x86 MMX and SSE2 Code</dt>
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<dd><a name="index-MMX"></a>
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<a name="index-SSE2"></a>
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<p>If the CPU selected has MMX code but the assembler doesn’t support it, a
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warning is given and non-MMX code is used instead. This will be an inferior
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build, since the MMX code that’s present is there because it’s faster than the
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corresponding plain integer code. The same applies to SSE2.
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</p>
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<p>Old versions of ‘<samp>gas</samp>’ don’t support MMX instructions, in particular
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version 1.92.3 that comes with FreeBSD 2.2.8 or the more recent OpenBSD 3.1
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doesn’t.
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</p>
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<p>Solaris 2.6 and 2.7 <code>as</code> generate incorrect object code for register
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to register <code>movq</code> instructions, and so can’t be used for MMX code.
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Install a recent <code>gas</code> if MMX code is wanted on these systems.
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Known-Build-Problems.html#Known-Build-Problems" accesskey="n" rel="next">Known Build Problems</a>, Previous: <a href="Notes-for-Package-Builds.html#Notes-for-Package-Builds" accesskey="p" rel="prev">Notes for Package Builds</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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