[Solved] How to Build Latest HandBrake on linux with FDO (PGO) + LTO?

DanglingPointer Asks: How to Build Latest HandBrake on linux with FDO (PGO) + LTO?
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 -flto which 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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