Hi! I noticed an issue in GMP 6.1.2 when compiling it with CFLAGS="-pipe -O2 - march=znver1" for x86-32 on Gentoo Linux (in chroot). Configure fails the "mpn_lshift_com optimization 2" test, because that test uses `malloc` where it should have used `calloc`, according to an investigation by FreeBSD developers, who created a patch that fixes the issue (which I confirm it does): https://svnweb.freebsd.org/ports?view=revision&revision=434069
This was fixed for the "gmp" repository in "Recognise AMD zen." by Torbjorn Granlund <t...@gmplib.org>: https://gmplib.org/repo/gmp/rev/2ce5c60f5372 But it was not backported to the "gmp-6.1" repository. The other recent commits to that file probably also qualify for backporting. My GCC is 6.4.0 (Gentoo 6.4.0-r1 p1.3) and the Linux kernel I am running on currently is from Fedora Rawhide 28 (4.15.0-0.rc4.git3.1.fc28, built 2017-12-21 16:11:35 UTC). Best regards, Dennis See-Also: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217071
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