[ariccio]

Similarly to bpo-40145, this tweaks build options to reduce the size of the
binary.

This patch turns on (for release builds) Whole Program Optimization, MinSpace
optimization, /Ob2 AnySuitable function inlining, /Zo (so that people can still
debug it when lots of code has been optimized out), /OPT:REF dead code
elimination, /OPT:ICF COMDAT folding, Link Time Code Generation, and DebugFull
debugging information creation.

For debug builds, it enables all of that, except instead of the MinSpace
optimization, it's only /Ob2 with custom optimization. My intent is to not
optimize any asserts or similar checks, while still getting the benefit of
dead and duplicate code elimination.

_overlapped.pyd   32 bit unimproved release size: 31KB
_overlapped.pyd   32 bit   improved release size: 29KB
                                size reduction:   -3KB
                             %  size reduction:    10%

_overlapped_d.pyd 32 bit unimproved release size: 55KB
_overlapped_d.pyd 32 bit   improved release size: 34KB
                                size reduction:  -21KB
                             %  size reduction:    38%




_overlapped.pyd   64 bit unimproved release size: 39KB
_overlapped.pyd   64 bit   improved release size: 36KB
                                size reduction:   -3KB
                             %  size reduction:     8%


_overlapped_d.pyd 64 bit unimproved release size: 74KB
_overlapped_d.pyd 64 bit   improved release size: 41KB
                                size reduction:  -33KB
                             %  size reduction:    45%

https://bugs.python.org/issue40151

[taleinat]

Ping, @python/windows-team?

[ariccio]

Sorry, I need to reland this whole series. The pandemic and family got in the way, and I need to redo the build options pull.

[taleinat]

Sorry, I need to reland this whole series. The pandemic and family got in the way, and I need to redo the build options pull.

No worries, thanks for working on this!

Be safe.