media-libs/openjpeg generates slightly different images depending on whether it was compiled with "normal" instructions or with some "advanced" ones, e.g. using fused-multiply-add (FMA), FP387. This lets the test suite of openjpeg fail. For more details see bug #628430 and the references therein. The FMA instructions are implied by -march=<ABC> in combination with -O2 (or higher) in the CFLAGS, which are very common if not recommended for users. GCC allows to control the usage of FMA with the -ffp-contract= option [0] In https://bugs.gentoo.org/628430#c4 there is also the -mfpmath= setting mentioned which might or might not disable FMA or similar instructions if set to -mfpmath=sse. A possible fix/workaround would be to filter the offending flags from CFLAGS and/or add their disabled counterparts (e.g. -ffp-contract=off, -mfpmath=sse, ...). [0] https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-ffp-contract
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=77e5ad18b2cc380826ad062461b08357633889a6 commit 77e5ad18b2cc380826ad062461b08357633889a6 Author: Sam James <sam@gentoo.org> AuthorDate: 2020-12-29 02:56:24 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2020-12-29 02:56:24 +0000 media-libs/openjpeg: security bump to 2.4.0 Bug: https://bugs.gentoo.org/675426 Bug: https://bugs.gentoo.org/718918 Closes: https://bugs.gentoo.org/715306 Closes: https://bugs.gentoo.org/715422 Closes: https://bugs.gentoo.org/715130 Package-Manager: Portage-3.0.9, Repoman-3.0.2 Signed-off-by: Sam James <sam@gentoo.org> media-libs/openjpeg/Manifest | 2 + .../files/openjpeg-2.4.0-gnuinstalldirs.patch | 420 +++++++++++++++++++++ media-libs/openjpeg/openjpeg-2.4.0.ebuild | 139 +++++++ 3 files changed, 561 insertions(+)
