Announce: GNU MPFR 4.2.1 is released

Vincent Lefevre vincent at
Tue Aug 22 13:36:05 CEST 2023

GNU MPFR 4.2.1 ("fondue savoyarde", patch level 1), a C library for
multiple-precision floating-point computations with correct rounding,
is now available for download from the MPFR web site:

and from the GNU FTP site:

Thanks very much to those who sent us bug reports and/or tested the
release candidate.

The SHA1 digests:
f9dbe49b092e4c8e0a039e6d46c059696cc2f51c  mpfr-4.2.1.tar.bz2
ca7a96560f09b548855f7f97b20cba8106f2f203  mpfr-4.2.1.tar.gz
31ffb4244cb469e2b4937cce1f50150300971dfb  mpfr-4.2.1.tar.xz

The SHA256 digests:
b9df93635b20e4089c29623b19420c4ac848a1b29df1cfd59f26cab0d2666aa0  mpfr-4.2.1.tar.bz2
116715552bd966c85b417c424db1bbdf639f53836eb361549d1f8d6ded5cb4c6  mpfr-4.2.1.tar.gz
277807353a6726978996945af13e52829e3abd7a9a5b7fb2793894e18f1fcbb2  mpfr-4.2.1.tar.xz

The signatures:

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

  gpg --recv-keys 5831D11A0D4DB02A

or by downloading it from <>.
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.

Changes from version 4.2.0 to version 4.2.1:
- Bug fixes (see <> and/or the
  ChangeLog file).
- Improved MPFR manual.
- Configure tests: replaced the test of the link with GMP, in order to
  avoid the use of a function without a prototype (Autoconf issue), as
  this is obsolescent in ISO C. The new test should be more robust.

You can send success and failure reports to <mpfr at>, and give
us the canonical system name (by running the "./config.guess" script),
the processor and the compiler version, in order to complete the
"Platforms Known to Support MPFR" section of the MPFR 4.2.1 web page.


Vincent Lefèvre <vincent at> - Web: <>
100% accessible validated (X)HTML - Blog: <>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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