Changes 5.1.1:
BUGS FIXED
On Windows 64-bit, an error causing link errors about __gmp_binvert_limb_table has been fixed.
Aarch64 alias ARM64 support now works.
A possible buffer overrun in mpz_ior has been fixed.
A rare sign flip in mpz_remove has been fixed.
A bug causing problems with mpf numbers with absolute value ≥ 231 has been fixed.
Several bugs in mini-gmp have been fixed.
A bug caused by automake, related to the 'distcheck' target, has been fixed by upgrading the automake used for GMP release engineering.

FEATURES
Preliminary support for the x32 ABI under x86-64.

MISC
The mini-gmp testsuite now tests the entire set of functions.
Various improvements of the GMP testsuite.

(adam)