GNU MPFR version 4.2.2 (released on 20 March 2025)

The fondue savoyarde release, patch level 2.

MPFR 4.2.2 requires GMP 5.0 or higher.

Download

The MPFR 4.2.2 source can be downloaded in the following archive formats:

• mpfr-4.2.2.tar.xz (tar/xz, 1.5 MB, signature),
• mpfr-4.2.2.tar.bz2 (tar/bzip2, 1.7 MB, signature),
• mpfr-4.2.2.tar.gz (tar/gzip, 2.2 MB, signature),
• mpfr-4.2.2.zip (zip, 2.6 MB, signature).

Each tarball is signed by Vincent Lefèvre. This can be verified using the DSA key ID 5831D11A0D4DB02A; this key can be retrieved with:

gpg --recv-keys 5831D11A0D4DB02A

or by downloading it from https://www.vinc17.net/pgp.html. The key fingerprint is:

A534 BE3F 83E2 41D9 1828  0AEB 5831 D11A 0D4D B02A

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.

Documentation

• The reference manual: [html] [dvi] [ps] [pdf]
• The MPFR FAQ (common to all MPFR versions).

Bugs

See the BUGS file. The Reporting Bugs section of the MPFR manual gives details on how to report new bugs.

Changes from version 4.2.1 to version 4.2.2

• In order to resolve a portability issue with the _Float128 fallback to __float128 for binary128 support (e.g. with Clang and glibc 2.41), the prototypes of the corresponding conversion functions had to be changed, with _Float128 replaced by mpfr_float128, where mpfr_float128 is a macro defined as _Float128 by default. This changes neither the ABI nor the API (except that the end user of MPFR would need to define mpfr_float128 as the actual type for the binary128 format if this is not the standard _Float128 type).
• Other bug fixes (see the fixed bugs on the MPFR 4.2.1 page and/or the ChangeLog file). In particular, the formatted output functions behaved incorrectly with %c on the value 0; such a use is uncommon, but this bug may have security implications.
• Improved MPFR manual.
• Detect the use of GMP's buggy vsnprintf replacement at configure time. With it, the tests of "%a" will be disabled to avoid an assertion failure in the MPFR testsuite. A warning will be displayed in the configure output in such a case.

Platforms Known to Support MPFR

MPFR 4.2.2 has been successfully compiled and checked on the following platforms:

• aarch64-apple-darwin21.6.0 (clang 14.0.0);
• aarch64-unknown-linux-gnu (gcc 8.5.0 and 14.2.0, clang 19.1.7 on Termux/Android, tcc mob branch);
• aarch64-unknown-linux-musl (gcc 14.2.0);
• i586-unknown-freebsd13.3 (clang 17.0.6);
• i686-w64-mingw32 (Wine, gcc 14-win32);
• mips-unknown-linux-gnu (o32 and n32 ABI, gcc 8.3.0);
• powerpc-ibm-aix7.3.1.0 (IBM POWER8, gcc 10.3.0);
• powerpc64-unknown-linux-gnu (IBM POWER7, gcc 4.8.5);
• powerpc64le-unknown-linux-gnu (IBM POWER8, gcc 4.8.5; IBM POWER9, gcc 4.8.5 and 8.3.1, IBM XL C/C++ 16.1.1.3);
• riscv64-unknown-freebsd15.0 (clang 19.1.7);
• riscv64-unknown-linux-gnu (gcc 13.3.0);
• sparc-sun-solaris2.9 (gcc 4.6.4);
• sparc-sun-solaris2.10 (gcc 5.5.0, Studio 12.6 Sun C 5.15 2017/05/30);
• x86_64-pc-linux-gnu (gcc 4.8.5, 4.9.4, 5.5.0, 6.5.0, 8.4.0, 9.5.0, 10.5.0, 12.2.0, 14.2.0 and 15.0.1 snapshot, g++ 4.9 and 14.2.0, clang 3.6.2, 3.7.1, 6.0.1, 7.0.1, 8.0.1, 9.0.1, 10.0.1, 11.1.0, 12.0.1, 13.0.1, 14.0.6, 15.0.7, 16.0.6, 17.0.6 and 18.1.8, Intel oneAPI icx 2021.3.0, and tcc 0.9.27);
• x86_64-pc-linux-musl (gcc 14.2.0).

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