[issue41181] [macOS] Build macOS installer with LTO and PGO optimizations

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> We cannot depend on PGO and LTO for it unless we start building the installer on 10.15.

Clang 6.0 doesn't support LTO and PGO? Would you mind to elaborate?

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