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Note that the -Werror=* used is because these indicate cases where the compiler tries to optimize based on assuming that UB cannot exist, and as a result miscompiles code with UB. strict-aliasing in particular can be very bad even without LTO, but LTO makes it much worse.
I tried building with these flags to optimize my build using LTO:
-flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing
I got these errors:
Note that the -Werror=* used is because these indicate cases where the compiler tries to optimize based on assuming that UB cannot exist, and as a result miscompiles code with UB. strict-aliasing in particular can be very bad even without LTO, but LTO makes it much worse.
Previously reported downstream: https://bugs.gentoo.org/862924
Full build logs: build.log
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