Am 12.05.2021 um 20:53 schrieb Achim Gratz:
Thomas Wolff writes:
Am 10.05.2021 um 21:13 schrieb Achim Gratz:
The native and mingw-w64 cross compilers have been updated for both
architectures to the latest upstream release version:
gcc-11.1.0-0.1
Are there any known problems with gcc 11? My program crashes if
compiled with gcc -O2; gcc -O1 works, gcc 10 also works.
None that I'd know of, especially given that very vague symptoms. While
I guess it's possible that there's a bug in the optimizer, I'd first
attempt to rule out undefined behaviour in the program being compiled.
The crash vanishes after removing a few lines from a conditional (if
block) where the condition is false.
This smells like wrong calculation of a relative jump (Intel "short
jump") by the optimizer.
Regards,
Achim.
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