390 lines
18 KiB
HTML
390 lines
18 KiB
HTML
|
<?xml version="1.0" encoding="iso-8859-1"?>
|
||
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
|
||
|
|
|
||
|
|
<!--
|
||
|
|
Copyright 2000-2016 Free Software Foundation, Inc.
|
||
|
|
Contributed by the AriC and Caramba projects, INRIA.
|
||
|
|
|
||
|
|
This file is part of the GNU MPFR Library.
|
||
|
|
|
||
|
|
The GNU MPFR Library is free software; you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU Lesser General Public License as published by
|
||
|
|
the Free Software Foundation; either version 3 of the License, or (at your
|
||
|
|
option) any later version.
|
||
|
|
|
||
|
|
The GNU MPFR Library is distributed in the hope that it will be useful, but
|
||
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
||
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
||
|
|
License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Lesser General Public License
|
||
|
|
along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
|
||
|
|
http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
|
||
|
|
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
|
||
|
|
-->
|
||
|
|
|
||
|
|
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
|
||
|
|
|
||
|
|
<head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
|
||
|
|
<title>Frequently Asked Questions about GNU MPFR</title>
|
||
|
|
<style type="text/css">/*<![CDATA[*/
|
||
|
|
/* Global stylesheet for visual media */
|
||
|
|
|
||
|
|
html, body
|
||
|
|
{
|
||
|
|
background: white;
|
||
|
|
color: black;
|
||
|
|
}
|
||
|
|
|
||
|
|
div.logo { float: right }
|
||
|
|
div.logo img { border: 0 }
|
||
|
|
|
||
|
|
div.footer img { border: 0 }
|
||
|
|
|
||
|
|
dt
|
||
|
|
{
|
||
|
|
margin-top: 2ex;
|
||
|
|
margin-bottom: 1ex;
|
||
|
|
font-weight: bolder;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* For testing: dd { background: #ddddff } */
|
||
|
|
|
||
|
|
table { margin: 0.5ex auto }
|
||
|
|
|
||
|
|
li { margin-top: 0.5ex; margin-bottom: 0.5ex }
|
||
|
|
|
||
|
|
dd + dd
|
||
|
|
{
|
||
|
|
margin-top: 0;
|
||
|
|
margin-bottom: 0;
|
||
|
|
padding-top: 0.5ex;
|
||
|
|
padding-bottom: 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
li > p, dd > p
|
||
|
|
{
|
||
|
|
margin-top: 0;
|
||
|
|
margin-bottom: 0;
|
||
|
|
padding-top: 0.5ex;
|
||
|
|
padding-bottom: 0.5ex;
|
||
|
|
}
|
||
|
|
|
||
|
|
.block-code code, code.block-code,
|
||
|
|
.block-code samp, samp.block-code
|
||
|
|
{
|
||
|
|
display: block;
|
||
|
|
padding: 0.5ex 0;
|
||
|
|
margin-left: 2em;
|
||
|
|
}
|
||
|
|
|
||
|
|
.nowrap { white-space: nowrap }
|
||
|
|
|
||
|
|
/*
|
||
|
|
dl.faq { counter-reset: faq }
|
||
|
|
|
||
|
|
dl.faq dt:before
|
||
|
|
{
|
||
|
|
counter-increment: faq;
|
||
|
|
content: counter(faq) ". ";
|
||
|
|
}
|
||
|
|
*/
|
||
|
|
|
||
|
|
dl.faq dt { background: #dddddd }
|
||
|
|
|
||
|
|
dl.faq dd
|
||
|
|
{
|
||
|
|
border-left: 4px solid;
|
||
|
|
border-color: transparent;
|
||
|
|
margin-left: 0em;
|
||
|
|
padding-left: 1.5em;
|
||
|
|
}
|
||
|
|
|
||
|
|
dl.faq dt:target + dd
|
||
|
|
{
|
||
|
|
border-left-color: #aaaaaa;
|
||
|
|
}
|
||
|
|
|
||
|
|
var.env { font-style: normal }
|
||
|
|
/*]]>*/</style>
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body>
|
||
|
|
|
||
|
|
<h1>Frequently Asked Questions about <cite><acronym>GNU</acronym> <acronym>MPFR</acronym></cite></h1>
|
||
|
|
|
||
|
|
<p><strong>Important notice: Problems with a particular version of
|
||
|
|
<cite><acronym>MPFR</acronym></cite> are discussed in the corresponding
|
||
|
|
bugs page.</strong></p>
|
||
|
|
|
||
|
|
<p>The latest version of this <acronym>FAQ</acronym> is available at
|
||
|
|
<a href="http://www.mpfr.org/faq.html">http://www.mpfr.org/faq.html</a>.
|
||
|
|
Please look at this version if possible.</p>
|
||
|
|
|
||
|
|
<ol>
|
||
|
|
<li><a href="#mpfr_vs_mpf">What are the differences between
|
||
|
|
<cite><acronym>MPF</acronym></cite> from <cite><acronym>GMP</acronym></cite>
|
||
|
|
and <cite><acronym>MPFR</acronym></cite>?</a></li>
|
||
|
|
<li><a href="#mpf2mpfr">How to convert my program written using
|
||
|
|
<cite><acronym>MPF</acronym></cite> to
|
||
|
|
<cite><acronym>MPFR</acronym></cite>?</a></li>
|
||
|
|
<li><a href="#no_libgmp">At configure time, I get the error: <q>libgmp not found or uses a different ABI.</q></a></li>
|
||
|
|
<li><a href="#undef_ref1">I get undefined reference to <code>__gmp_get_memory_functions</code>.</a></li>
|
||
|
|
<li><a href="#undef_ref2">When I link my program with
|
||
|
|
<cite><acronym>MPFR</acronym></cite>, I get undefined reference
|
||
|
|
to <code>__gmpXXXX</code>.</a></li>
|
||
|
|
<li><a href="#crash_high_prec">My program crashes with high precisions.</a></li>
|
||
|
|
<li><a href="#accuracy">Though I have increased the precision, the results
|
||
|
|
are not more accurate.</a></li>
|
||
|
|
<li><a href="#detect_mpfr">How can I detect <cite><acronym>MPFR</acronym></cite>
|
||
|
|
installation using <cite>autoconf</cite> or <cite>pkg-config</cite>?</a></li>
|
||
|
|
<li><a href="#cite">How to cite <cite><acronym>MPFR</acronym></cite> in a
|
||
|
|
scientific publication?</a></li>
|
||
|
|
<li><a href="#fpic">When I build <cite><acronym>MPFR</acronym></cite>, I get
|
||
|
|
an error asking me to recompile with <samp>-fPIC</samp>.</a></li>
|
||
|
|
</ol>
|
||
|
|
|
||
|
|
<dl class="faq">
|
||
|
|
|
||
|
|
<dt id="mpfr_vs_mpf">1. What are the differences between
|
||
|
|
<cite><acronym>MPF</acronym></cite> from <cite><acronym>GMP</acronym></cite>
|
||
|
|
and <cite><acronym>MPFR</acronym></cite>?</dt>
|
||
|
|
|
||
|
|
<dd><p>The main differences are:</p>
|
||
|
|
<ul>
|
||
|
|
<li><p>The precision of a <cite><acronym>MPFR</acronym></cite> variable
|
||
|
|
is the <em>exact</em> number of bits used for its mantissa, whereas in
|
||
|
|
<cite><acronym>MPF</acronym></cite>, the precision requested by the user
|
||
|
|
is a minimum value (<cite><acronym>MPF</acronym></cite> generally uses a
|
||
|
|
higher precision). With the additional difference below, this implies that
|
||
|
|
the <cite><acronym>MPFR</acronym></cite> results do not depend on the
|
||
|
|
number of bits (16, 32, 64 or more) of the underlying architecture.</p></li>
|
||
|
|
<li><p>As a consequence, <cite><acronym>MPFR</acronym></cite> uses a
|
||
|
|
base-2 exponent, whereas in <cite><acronym>MPF</acronym></cite>, this
|
||
|
|
is a base-2<sup>32</sup> or base-2<sup>64</sup> exponent, depending on
|
||
|
|
the limb size. For this reason (and other internal ones), the maximum
|
||
|
|
exponent range in <cite><acronym>MPFR</acronym></cite> is different
|
||
|
|
(and smaller, if the exponent is represented by the same type as in
|
||
|
|
<cite><acronym>MPF</acronym></cite>).</p></li>
|
||
|
|
<li><p><cite><acronym>MPFR</acronym></cite> provides an additional rounding
|
||
|
|
mode argument to its functions; furthermore, it is guaranteed that the
|
||
|
|
result of any operation is the nearest possible floating-point value from
|
||
|
|
the exact result (considering the input variables as exact values), taking
|
||
|
|
into account the precision of the destination variable and the rounding
|
||
|
|
mode. <cite><acronym>MPFR</acronym></cite> also says whether the rounded
|
||
|
|
result is above or below the exact result.</p></li>
|
||
|
|
<li><p><cite><acronym>MPFR</acronym></cite> supports much more functions
|
||
|
|
(in particular transcendental functions such as exponentials, logarithms,
|
||
|
|
trigonometric functions and so on) and special values: signed zeros,
|
||
|
|
infinities, not-a-number (NaN).</p></li>
|
||
|
|
</ul></dd>
|
||
|
|
|
||
|
|
<dt id="mpf2mpfr">2. How to convert my program written using
|
||
|
|
<cite><acronym>MPF</acronym></cite> to
|
||
|
|
<cite><acronym>MPFR</acronym></cite>?</dt>
|
||
|
|
|
||
|
|
<dd><p>You need to add <q><code>r</code></q> to the function names, and to
|
||
|
|
specify the rounding mode (<code>MPFR_RNDN</code> for rounding to nearest,
|
||
|
|
<code>MPFR_RNDZ</code> for rounding toward zero, <code>MPFR_RNDU</code>
|
||
|
|
for rounding toward plus infinity, <code>MPFR_RNDD</code> for rounding
|
||
|
|
toward minus infinity). You can also define macros as follows:
|
||
|
|
<code class="block-code">#define mpf_add(a, b, c) mpfr_add(a, b, c, MPFR_RNDN)</code></p>
|
||
|
|
<p>The header file <samp>mpf2mpfr.h</samp> from the
|
||
|
|
<cite><acronym>MPFR</acronym></cite> distribution automatically
|
||
|
|
redefines all <cite><acronym>MPF</acronym></cite> functions in this
|
||
|
|
way, using the default <cite><acronym>MPFR</acronym></cite> rounding
|
||
|
|
mode. Thus you simply need to add the following line in all your files
|
||
|
|
using <cite><acronym>MPF</acronym></cite> functions:
|
||
|
|
<code class="block-code">#include <mpf2mpfr.h></code>
|
||
|
|
just after the <samp>gmp.h</samp> and <samp>mpfr.h</samp>
|
||
|
|
header files. If the program uses <cite><acronym>MPF</acronym></cite>
|
||
|
|
internals (such as direct access to <code>__mpf_struct</code> members),
|
||
|
|
additional changes will be needed.</p></dd>
|
||
|
|
|
||
|
|
<dt id="no_libgmp">3. At configure time, I get the error: <q>libgmp not found or uses a different ABI.</q></dt>
|
||
|
|
|
||
|
|
<dd><p>This test (<samp>checking for __gmpz_init in -lgmp</samp>) comes
|
||
|
|
after the <samp>gmp.h</samp> detection. The failure occurs either because
|
||
|
|
the <cite><acronym>GMP</acronym></cite> library could not be found
|
||
|
|
(as it is not in the provided library search paths) or because the
|
||
|
|
<cite><acronym>GMP</acronym></cite> library that was found does not have
|
||
|
|
the expected <acronym title="Application Binary Interface">ABI</acronym>
|
||
|
|
(<abbr>e.g.</abbr> 32-bit <abbr>vs</abbr> 64-bit). The former problem can be
|
||
|
|
due to the fact that a static build of <cite><acronym>MPFR</acronym></cite>
|
||
|
|
was requested while only a shared <cite><acronym>GMP</acronym></cite> library
|
||
|
|
is installed (or the opposite, but another error can also show up in this
|
||
|
|
case, see the <a href="#fpic">question about <samp>-fPIC</samp></a>). The
|
||
|
|
latter problem can have several causes:</p>
|
||
|
|
<ul>
|
||
|
|
<li>A wrong libgmp library has been picked up. This can occur if you have
|
||
|
|
several <cite><acronym>GMP</acronym></cite> versions installed on the
|
||
|
|
machine and something is wrong with the provided library search paths.</li>
|
||
|
|
<li>Wrong compiler options (<samp>CFLAGS</samp>) were given. In general, the
|
||
|
|
presence or absence of the <samp>-m64</samp> compiler option must match the
|
||
|
|
library <acronym title="Application Binary Interface">ABI</acronym>.</li>
|
||
|
|
<li>A wrong <samp>gmp.h</samp> file has been picked up (if you have several
|
||
|
|
<cite><acronym>GMP</acronym></cite> versions installed). Indeed, by default,
|
||
|
|
<cite><acronym>MPFR</acronym></cite> gets the compiler options from the
|
||
|
|
<samp>gmp.h</samp> file (with <cite><acronym>GMP</acronym></cite> 4.2.3
|
||
|
|
or later); this is needed because <cite><acronym>GMP</acronym></cite> does
|
||
|
|
not necessarily use the default <acronym>ABI</acronym>. The consequence is
|
||
|
|
that if the <samp>gmp.h</samp> file is associated with a library using a
|
||
|
|
different <acronym>ABI</acronym>, the <acronym>ABI</acronym>-related options
|
||
|
|
will be incorrect. Hence the failure.</li>
|
||
|
|
</ul>
|
||
|
|
<p>Note: The <samp>config.log</samp> output gives more information
|
||
|
|
than the error message. In particular, see the output of the test:
|
||
|
|
<samp>checking for CC and CFLAGS in gmp.h</samp>; it should give you
|
||
|
|
the default compiler options (from <samp>gmp.h</samp>).</p>
|
||
|
|
|
||
|
|
<p>See also the answer to the <a href="#undef_ref1">next question</a>.</p></dd>
|
||
|
|
|
||
|
|
<dt id="undef_ref1">4. I get undefined reference to <code>__gmp_get_memory_functions</code>.</dt>
|
||
|
|
|
||
|
|
<dd><p>Note: this was mainly a problem when upgrading from
|
||
|
|
<cite><acronym>GMP</acronym></cite> 4.1.4 to a later version,
|
||
|
|
but information given below may still be useful in other cases,
|
||
|
|
when several <cite><acronym>GMP</acronym></cite> libraries are
|
||
|
|
installed on the same machine.</p>
|
||
|
|
|
||
|
|
<p>If you get such an error, in particular when running
|
||
|
|
<samp>make check</samp>, then this probably means that you are using
|
||
|
|
the header file from <cite><acronym>GMP</acronym></cite> 4.2.x but the
|
||
|
|
<cite><acronym>GMP</acronym></cite> 4.1.4 library. This can happen if
|
||
|
|
several <cite><acronym>GMP</acronym></cite> versions are installed on
|
||
|
|
your machine (<abbr>e.g.</abbr>, one provided by the system in
|
||
|
|
<samp>/usr/{include,lib}</samp> and a new one installed by the owner or
|
||
|
|
administrator of the machine in <samp>/usr/local/{include,lib}</samp>)
|
||
|
|
and your include and library search paths are inconsistent. On various
|
||
|
|
<acronym>GNU</acronym>/Linux machines, this is unfortunately the case
|
||
|
|
by default (<samp>/usr/local/include</samp> is in the default include
|
||
|
|
search path, but <samp>/usr/local/lib</samp> is <em>not</em> in the
|
||
|
|
default library search path). Typical errors are:
|
||
|
|
<samp class="block-code">undefined reference to `__gmp_get_memory_functions'</samp>
|
||
|
|
in <samp>make check</samp>. The best solution is to add
|
||
|
|
<samp>/usr/local/include</samp> to your <var class="env">C_INCLUDE_PATH</var>
|
||
|
|
environment variable and to add <samp>/usr/local/lib</samp> to your
|
||
|
|
<var class="env">LIBRARY_PATH</var> and <var class="env">LD_LIBRARY_PATH</var>
|
||
|
|
environment variables (and/or <var class="env">LD_RUN_PATH</var>).
|
||
|
|
Alternatively, you can use <samp>--with-gmp*</samp> configure options,
|
||
|
|
<abbr>e.g.</abbr> <samp>--with-gmp=/usr/local</samp>, but <strong>this is
|
||
|
|
not guaranteed to work</strong> (in particular with <samp>gcc</samp> and
|
||
|
|
system directories such as <samp>/usr</samp> or <samp>/usr/local</samp>),
|
||
|
|
and other software that uses <cite><acronym>GMP</acronym></cite> and/or
|
||
|
|
<cite><acronym>MPFR</acronym></cite> will need correct paths too;
|
||
|
|
environment variables allow you to set them in a global way.</p>
|
||
|
|
<p>Other information can be given in the <samp>INSTALL</samp> file and
|
||
|
|
<samp>ld</samp> manual. Please look at them for more details. See also
|
||
|
|
the <a href="#undef_ref2">next question</a>.</p></dd>
|
||
|
|
|
||
|
|
<dt id="undef_ref2">5. When I link my program with
|
||
|
|
<cite><acronym>MPFR</acronym></cite>, I get undefined reference
|
||
|
|
to <code>__gmpXXXX</code>.</dt>
|
||
|
|
|
||
|
|
<dd><p>Link your program with <cite><acronym>GMP</acronym></cite>. Assuming
|
||
|
|
that your program is <samp>foo.c</samp>, you should link it using:
|
||
|
|
<samp class="block-code">cc link.c -lmpfr -lgmp</samp>
|
||
|
|
<cite><acronym>MPFR</acronym></cite> library reference (<samp>-lmpfr</samp>)
|
||
|
|
should be before <cite><acronym>GMP</acronym></cite>'s one
|
||
|
|
(<samp>-lgmp</samp>). Another solution is, with <acronym>GNU</acronym>
|
||
|
|
<samp>ld</samp>, to give all the libraries inside a group:
|
||
|
|
<samp class="block-code">gcc link.c -Wl,--start-group libgmp.a libmpfr.a -Wl,--end-group</samp>
|
||
|
|
See <samp>INSTALL</samp> file and <samp>ld</samp> manual for more
|
||
|
|
details.</p>
|
||
|
|
<p>If you used correct link options, but still get an error, this may mean
|
||
|
|
that your include and library search paths are inconsistent. Please see the
|
||
|
|
<a href="#undef_ref1">previous question</a>.</p></dd>
|
||
|
|
|
||
|
|
<dt id="crash_high_prec">6. My program crashes with high precisions.</dt>
|
||
|
|
|
||
|
|
<dd><p>Your stack size limit may be too small; indeed, by default,
|
||
|
|
<cite><acronym>GMP</acronym></cite> 4.1.4 and below allocates all
|
||
|
|
temporary results on the stack, and in very high precisions, this
|
||
|
|
limit may be reached. You can solve this problem in different ways:</p>
|
||
|
|
<ul>
|
||
|
|
<li><p>You can upgrade to <cite><acronym>GMP</acronym></cite> 4.2 (or above),
|
||
|
|
which now makes temporary allocations on the stack only when they are
|
||
|
|
small.</p></li>
|
||
|
|
<li><p>You can increase the stack size limit with the <samp>limit</samp>,
|
||
|
|
<samp>unlimit</samp> or <samp>ulimit</samp> command, depending on your
|
||
|
|
shell. This may fail on some systems, where the maximum stack size cannot
|
||
|
|
be increased above some value.</p></li>
|
||
|
|
<li><p>You can rebuild both <cite><acronym>GMP</acronym></cite> and
|
||
|
|
<cite><acronym>MPFR</acronym></cite> to use another allocation method.</p></li>
|
||
|
|
</ul></dd>
|
||
|
|
|
||
|
|
<dt id="accuracy">7. Though I have increased the precision, the results
|
||
|
|
are not more accurate.</dt>
|
||
|
|
|
||
|
|
<dd><p>The reason may be the use of C floating-point numbers. If you want
|
||
|
|
to store a floating-point constant to a <code>mpfr_t</code>, you should use
|
||
|
|
<code>mpfr_set_str</code> (or one of the <cite><acronym>MPFR</acronym></cite>
|
||
|
|
constant functions, such as <code>mpfr_const_pi</code> for π) instead
|
||
|
|
of <code>mpfr_set_d</code> or <code>mpfr_set_ld</code>. Otherwise the
|
||
|
|
floating-point constant will be first converted into a reduced-precision
|
||
|
|
(<abbr>e.g.</abbr>, 53-bit) binary number before
|
||
|
|
<cite><acronym>MPFR</acronym></cite> can work with it. This is the case
|
||
|
|
in particular for most exact decimal numbers, such as 0.17, which are
|
||
|
|
not exactly representable in binary.</p>
|
||
|
|
<p>Also remember that <cite><acronym>MPFR</acronym></cite> does not track
|
||
|
|
the accuracy of the results: copying a value <var>x</var> to <var>y</var>
|
||
|
|
with <code>mpfr_set (y, x, MPFR_RNDN)</code> where the variable <var>y</var>
|
||
|
|
is more precise than the variable <var>x</var> will not make it more
|
||
|
|
accurate; the (binary) value will remain unchanged.</p></dd>
|
||
|
|
|
||
|
|
<dt id="detect_mpfr">8. How can I detect <cite><acronym>MPFR</acronym></cite>
|
||
|
|
installation using <cite>autoconf</cite> or <cite>pkg-config</cite>?</dt>
|
||
|
|
|
||
|
|
<dd><p>The <cite><acronym>MPFR</acronym></cite> team does not currently
|
||
|
|
recommend any <cite>autoconf</cite> code, but a section will later
|
||
|
|
be added to the <cite><acronym>MPFR</acronym></cite> manual. The
|
||
|
|
<cite><acronym>MPFR</acronym></cite> team does not wish to support
|
||
|
|
<cite>pkg-config</cite> yet.</p></dd>
|
||
|
|
|
||
|
|
<dt id="cite">9. How to cite <cite><acronym>MPFR</acronym></cite> in a
|
||
|
|
scientific publication?</dt>
|
||
|
|
|
||
|
|
<dd><p>To properly cite <cite><acronym>MPFR</acronym></cite> in a scientific
|
||
|
|
publication, please cite the
|
||
|
|
<a href="http://doi.acm.org/10.1145/1236463.1236468"><acronym title="Association for Computing Machinery">ACM</acronym>
|
||
|
|
<acronym title="Transactions on Mathematical Software">TOMS</acronym>
|
||
|
|
paper</a>
|
||
|
|
(<a href="http://toms.acm.org/cgi/TOMSbibget.cgi?Fousse:2007:MMP">BibTeX</a>)
|
||
|
|
and/or the library web page
|
||
|
|
<a href="http://www.mpfr.org/">http://www.mpfr.org</a>. If your publication
|
||
|
|
is related to a particular release of <cite><acronym>MPFR</acronym></cite>,
|
||
|
|
for example if you report timings, please also indicate the release number
|
||
|
|
for future reference.</p></dd>
|
||
|
|
|
||
|
|
<dt id="fpic">10. When I build <cite><acronym>MPFR</acronym></cite>, I get
|
||
|
|
an error asking me to recompile with <samp>-fPIC</samp>.</dt>
|
||
|
|
|
||
|
|
<dd><p>A typical error looks like:</p>
|
||
|
|
<p><tt>/usr/bin/ld: <em>/path/to/</em>libgmp.a(realloc.o): relocation
|
||
|
|
R_X86_64_32 against `.rodata.str1.1' can not be used when making a
|
||
|
|
shared object; recompile with -fPIC<br />
|
||
|
|
<em>/path/to/</em>libgmp.a: could not read symbols: Bad value<br />
|
||
|
|
collect2: ld returned 1 exit status</tt></p>
|
||
|
|
<p>The probable reason is that you tried to build
|
||
|
|
<cite><acronym>MPFR</acronym></cite> with the shared library enabled (this
|
||
|
|
is the default), while only a static <cite><acronym>GMP</acronym></cite>
|
||
|
|
library could be found. To solve this problem, either rebuild and reinstall
|
||
|
|
<cite><acronym>GMP</acronym></cite> without the <samp>--disable-shared</samp>
|
||
|
|
configure option, or configure <cite><acronym>MPFR</acronym></cite> with
|
||
|
|
<samp>--disable-shared</samp>. If you did this and still get the above
|
||
|
|
error, the cause may be conflicting <cite><acronym>GMP</acronym></cite>
|
||
|
|
versions installed on your system; please check that your search path
|
||
|
|
settings are correct.</p>
|
||
|
|
<p>Additional note about the last sentence: Under <acronym>GNU</acronym>/Linux
|
||
|
|
(for instance), the linker takes the first library found in the library search
|
||
|
|
path, whether it is dynamic or static. The default behavior under darwin is
|
||
|
|
different, but <cite><acronym>MPFR</acronym></cite> will change it.</p></dd>
|
||
|
|
<!-- Reference concerning darwin: see MPFR_LD_SEARCH_PATHS_FIRST
|
||
|
|
in MPFR's configure.{ac,in} and acinclude.m4 -->
|
||
|
|
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
</body>
|
||
|
|
|
||
|
|
</html>
|