Passing CFLAGS and CXXFLAGS to a HandBrake build for the latest version (v1.3.3 at the time of this writing) will work until you add
-fltowhich will FAIL the whole build.
How to build HandBrake with LTO option
-flto and as a stretch goal, with FDO as well (feedback directed optimisation aka FDO aka PGO)?
Most of the codecs within HandBrake are developed with “hand-coded” assembly, so many assert that the compiler optimisation gains would not be that much.
I would like to test and challenge that assertion!
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