Created attachment 897667 [details, diff] Upstream patch to properly guard VSX use, edited for 3.4.0-r2 Both currently available Eigen versions (3.4.0-r1 and 3.4.0-r2) unconditionally use VSX intrinsics when installed on PPC and PPC64 hosts, respecting neither the `altivec` nor `vsx` PPC CPU flags. This causes build failures in packages which use Eigen, such as media-video/movit or kde-apps/step, when built on hardware which doesn't support VSX. A typical error seen in the downstream package is something along the lines of `error: '__builtin_vsx_cmpge_4si' requires the '-mvsx' option`. The -9999 Git version already contains a patch, see https://gitlab.com/libeigen/eigen/-/merge_requests/1028 – but some software doesn't build against that version, as it has bumped the compiler requirements to C++14 (see https://bugs.gentoo.org/928157 ) and also apparently introduced some API changes. At least kde-apps/step-24.02.2 currently can't build against eigen-9999, even after passing `MYCMAKEARGS='-DCMAKE_CXX_STANDARD=14'` to the build. Can we add the patch to 3.4.0-r2 to allow building KDE apps on ppc? I edited it to make it apply cleanly, see the attachment.
Sure.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=c7a9b7d8cdac586964c6f68ba8095ba7471f37b9 commit c7a9b7d8cdac586964c6f68ba8095ba7471f37b9 Author: Sam James <sam@gentoo.org> AuthorDate: 2024-07-16 23:03:41 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2024-07-16 23:03:41 +0000 dev-cpp/eigen: properly guard VSX use Fixes build on VSX-less ppc* hardware. Closes: https://bugs.gentoo.org/936107 Thanks-to: jonys <vidra.jonas@seznam.cz> Signed-off-by: Sam James <sam@gentoo.org> dev-cpp/eigen/eigen-3.4.0-r3.ebuild | 458 +++++++++++++++++++++++ dev-cpp/eigen/files/eigen-3.4.0-ppc-no-vsx.patch | 195 ++++++++++ 2 files changed, 653 insertions(+)
