When GMP ./configure is run without arguments, it correctly auto-detects microarchitecure and uses best possible subroutines (uses MULX instruction when run on Haswell, for instance). When configures thru gmp-6.0.0a.ebuild, GMP treats every x86-64 as K8, which results in poor perfomance. GMP devs spent time optimizing their library, but Gentoo users do not benefit from that. Reproducible: Always Steps to Reproduce: 1. Use not very old x86-64 computer (core2, core-i*, K10 will do), anything more capable than k8 2. Run GMP configure by hand. When done, say 'fgrep k8 config.log'. That gives nothing - you are not on k8. 3. 'ebuild gmp-6.0.0a.ebuild clean configure'. 'fgrep k8 config.log' gives lots of matches such as config.status:1793: linking /tmp/portage/dev-libs/gmp-6.0.0a/work/gmp-6.0.0/mpn/x86_64/k8/mul_basecase.asm to mpn/mul_basecase.asm - now GMP treats your modern computer like old k8. Actual Results: GMP misconfigured. Expected Results: GMP configured to full perfomance. I offer a cure 66a68,72 > build_alias=`/bin/sh $S/config.guess` || > die "failed to run config.guess" > [ -z $build_alias ] && die "empty result from config.guess" > einfo "guessed processor type: $build_alias" > 67a74 > export ac_cv_host=$build_alias This patch runs GMP auto-guesser, then feeds result to configure thru variable ac_cv_host.
*** This bug has been marked as a duplicate of bug 235697 ***
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=121152c38caefd8e94fb8c90cb51102693b6d6a8 commit 121152c38caefd8e94fb8c90cb51102693b6d6a8 Author: Sam James <sam@gentoo.org> AuthorDate: 2022-12-01 03:26:54 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2022-12-01 03:41:54 +0000 dev-libs/gmp: allow automatic detection of host for USE=-cpudetection Bug: https://bugs.gentoo.org/883201 Closes: https://bugs.gentoo.org/235697 Closes: https://bugs.gentoo.org/545442 Signed-off-by: Sam James <sam@gentoo.org> .../{gmp-6.2.1-r3.ebuild => gmp-6.2.1-r4.ebuild} | 32 +++++++++++++++++++--- dev-libs/gmp/metadata.xml | 13 ++++++++- profiles/arch/amd64/package.use.mask | 4 --- profiles/arch/base/package.use.mask | 4 --- profiles/arch/x86/package.use.mask | 4 --- 5 files changed, 40 insertions(+), 17 deletions(-)
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=2e58af672b41a624f84eb7fada145ab2f6c2b1b6 commit 2e58af672b41a624f84eb7fada145ab2f6c2b1b6 Author: Sam James <sam@gentoo.org> AuthorDate: 2022-12-06 10:48:07 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2022-12-06 10:52:50 +0000 dev-libs/gmp: further econf fixes * Use gnuconfig.eclass to update configfsf.{guess,sub} before the wrapped versions call them. * Export CBUILD too just in case for the deduced host from upstream's wrapped config.guess (not the same as gnuconfig's at all, see bugs for details). * Save/restore upstream's config.{guess,sub} to make sure that for the second multilib build we still have it available to run. In practice, this may not have mattered too much, as the exported ac_cv_host should've persisted, but it's still worth being (clearly) correct as is the case now. * Move cpudetection warning into pkg_pretend so it's easier to spot and we also don't then repeat it for each ABI. Bug: https://bugs.gentoo.org/235697 Bug: https://bugs.gentoo.org/545442 Bug: https://bugs.gentoo.org/883201 See: 78b4d4ebbcee12f5ef4c1dfa89f80c98a582db9d See: 3fe1b5370c0cc1537d1249e8ec9d2fbcd8619499 See: bf286a7973d8b95dbef90f17cc8e2d66c19a47c8 See: 121152c38caefd8e94fb8c90cb51102693b6d6a8 Signed-off-by: Sam James <sam@gentoo.org> .../{gmp-6.2.1-r4.ebuild => gmp-6.2.1-r5.ebuild} | 32 ++++++++++++++++++---- 1 file changed, 26 insertions(+), 6 deletions(-)
