From: Thomas Wolff <towo@towo.net>
To: cygwin@cygwin.com
Subject: Re: [ANNOUNCEMENT] Test: {mingw64-{i686,x86_64}-,}gcc-11.1.0-0.1
Date: Thu, 13 May 2021 10:57:50 +0200 [thread overview]
Message-ID: <29a53ee2-cac3-6815-792d-36f96be47bd1@towo.net> (raw)
In-Reply-To: <87mtszzsvd.fsf@Rainer.invalid>
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.
next prev parent reply other threads:[~2021-05-13 8:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-10 19:13 Achim Gratz
2021-05-12 9:14 ` Thomas Wolff
2021-05-12 10:42 ` Jonathan Yong
2021-05-12 18:30 ` Thomas Wolff
2021-05-13 1:41 ` Brian Inglis
2021-05-13 2:22 ` Thomas Wolff
2021-05-12 18:53 ` Achim Gratz
2021-05-13 8:57 ` Thomas Wolff [this message]
2021-05-13 19:33 ` Hans-Bernhard Bröker
2021-05-13 21:57 ` Thomas Wolff
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