maintainer-feedback requested: [Bug 215402] multimedia/ffmpeg: only use vendor optimizations, dropping -ffast-math

[bugzilla-noreply at freebsd.org]

Jan Beich (mail not working) <jbeich at FreeBSD.org> has reassigned Bugzilla
Automation <bugzilla at FreeBSD.org>'s request for maintainer-feedback to
multimedia at FreeBSD.org:
Bug 215402: multimedia/ffmpeg: only use vendor optimizations, dropping
-ffast-math
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215402



--- Description ---
Created attachment 178083
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=178083&action=edit
v0

configure has --enable-optimizations (default) which includes -O3
-fomit-frame-pointer. Together with unconditional stripping it breaks unwinding
as used by pmcstat/dtrace or -fsanitize=address. Rather than add PROFILE option
let's use OPTIMIZED_CFLAGS to control vendor optimizations. But doing so
induces POLA as -ffast-math from ports r69328 would contaminate defaults or
left out.

In my opinion, extra optimization flags should not leave make.conf. Vendor
doesn't test those, so having in port adds to maintenance to check with
clang/gcc or on different release/architecture tuples.