![[MPFR]](../mpfr100.png){kind=small}
The canard à l'orange release, patch level 6.
MPFR 3.1.6 requires GMP 4.1.0 or higher (GMP 4.2.3 or higher is recommended).
Warning! Due to the fact that
TLS support is now detected
automatically, the MPFR build can be incorrect on some
platforms (compiler or system bug). Indeed,
the
TLS implementation of some compilers/platforms is buggy,
and MPFR cannot detect every problem at configure time.
Please run make check
to see if your build is affected.
If you get failures, you should try the --disable-thread-safe
configure option to disable TLS and see if this solves
these failures. But you should not use an MPFR library
with TLS disabled in a multithreaded program (unless
you know what you are doing).
The MPFR 3.1.6 source can be downloaded in the following archive formats:
Each tarball is signed by Vincent Lefèvre. This can be verified using the DSA key ID 980C197698C3739D; this key can be retrieved with:
gpg --recv-keys 980C197698C3739D
or by downloading it from https://www.vinc17.net/pgp.html. The key fingerprint is:
07F3 DBBE CC1A 3960 5078 094D 980C 1976 98C3 739D
The signatures can be verified with:
gpg --verify file.asc
You should check that the key fingerprint matches.
MPFR is also available via third-party packages and ports.
The bugs listed below have been fixed (latest update: 2017-12-15). The patches are distributed under the same license as this version of MPFR, that is, the GNU Lesser General Public License (GNU Lesser GPL), version 3 or later.
The following instructions are for Linux and may be similar for other operating systems. You can apply the patches in several ways:
patch -N -Z -p1 < path_to_patches_filefrom the source directory. The -N option allows the patch command to ignore patches already applied. The -Z option sets the modification time of the patched files from time stamps given in the patch file, thus avoiding the need of some development utilities (such as autoconf); this may generate a
Not setting timewarning for the PATCHES file, but you can safely ignore it. Under Microsoft Windows, in addition to the above options, you may need the --binary option (this depends whether the end-of-lines have been converted when you downloaded the patch file). Also note that the --dry-run option does not work if the cumulative patch has some file listed several times.
svn co https://scm.gforge.inria.fr/anonscm/svn/mpfr/branches/3.1 mpfr-3.1In this case, as said on the Gforge page, you should read the README.dev file for details on how to build MPFR. Also note that the branch may contain additional minor fixes.
With the first two ways, the PATCHES file is modified,
so that one can know what patches have been applied, using the
mpfr_get_patches function. Moreover a suffix is added to
the version string, but note that for practical reasons, not all the
files where the version appears are patched; thus one can also track
applied patches with the MPFR_VERSION_STRING macro (header)
and the mpfr_get_version function (library). However, if
some patches are not applied or if patches are applied in a different
order, then the patch command will fail to update some chunks, so that
the suffix is not always reliable for patches.
Note: These patches are in unified diff format and some vendors' patch commands cannot deal with them; in this case, please use GNU patch (it may already be installed on your system, e.g. as /usr/local/bin/patch or gpatch).
Fixed bugs, with patches:
mpfr_get_ld, mpfr_get_si, mpfr_get_ui, mpfr_get_sj, mpfr_get_uj and mpfr_get_z can behave incorrectly in a very reduced exponent range. These bugs are fixed by the mpfr_get patch.mpfr_root, which computes x1/k (the kth root of x), for |x| = 1 and k > 100. The reason is that when |x| = 1, the algorithm used for k >100 gets the exponent of zero, while zero does not have an exponent. When these assertions are disabled (default), one can prove that the generated code is actually correct in this specific case. This bug is fixed by the root patch, which also provides a test case.Other bugs: See the tracker and the BUGS file.
make checkwould check an installed, compatible MPFR library found in LD_LIBRARY_PATH instead of the one that has been built with
make.
MPFR 3.1.6 has been successfully compiled and checked on the following platforms: