Control: reassign -1 gcc-8 8.2.0-3 Control: severity -1 normal Control: retitle -1 gcc-8: miscompiles vec_sl at -O3 with -fwrapv on ppc64el Control: affects -1 src:ffmpeg Control: forwarded -1 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86731 Control: tags -1 upstream Hi, On 10/08/18 23:54, Simon Quigley wrote: > Package: ffmpeg > Severity: important > > Attached is the most recent autopkgtest failure log against the new > ffmpeg release in Ubuntu. I managed to debug this issue during DebConf and I think it is a gcc-8 regression. I filed this upstream bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86731 > I don't believe this is an Ubuntu-only issue. The bug only happens when -O3 is passed and this only happens on Ubuntu so this bug is Ubuntu specific. I suggest Ubuntu temporarily patches ffmpeg to strip the -O3 option and pass -O2 instead. Alternatively you could try rewriting the broken code (in libavcodec/ppc/fdctdsp.c) to avoid the miscompilation. James
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