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Subject: Re: [ANNOUNCEMENT] Test: {mingw64-{i686,x86_64}-,}gcc-11.1.0-0.1
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From: Thomas Wolff <towo AT towo DOT net>
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Date: Thu, 13 May 2021 10:57:50 +0200
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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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