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From: "jirislaby at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/107405] enums can be wrongly long in gcc-13 (in gnu99)
Date: Wed, 26 Oct 2022 07:27:41 +0000	[thread overview]
Message-ID: <bug-107405-4-AXFQWIadng@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-107405-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107405

--- Comment #4 from Jiri Slaby <jirislaby at gmail dot com> ---
(In reply to Martin Liška from comment #3)
> > enum { A = 0xffffffff, B = 1 << 31, };
> > int main() { printf("%lx %x %zu\n", A, B, sizeof(B)); }
> > 
> 
> Apparently, 0xffffffff is treated by the compiler as unsigned int constant
> and thus it likely leads to the promotion to a longer interger.

The problem is that is breaks existing code (which will be barely fixed as this
is clearly gcc-13's bug (or change of behavior at least)).

Another question is why B is affected by A at all? Also sizeof of that enum (if
one gives it a name) is 8 with gcc-13. That is not allowed by the standard,
IMO.

  parent reply	other threads:[~2022-10-26  7:27 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-26  4:26 [Bug c/107405] New: enums can be long in gcc-13 jirislaby at gmail dot com
2022-10-26  4:28 ` [Bug c/107405] enums can be wrongly long in gcc-13 (in gnu99) jirislaby at gmail dot com
2022-10-26  6:55 ` marxin at gcc dot gnu.org
2022-10-26  7:08 ` marxin at gcc dot gnu.org
2022-10-26  7:27 ` jirislaby at gmail dot com [this message]
2022-10-26  7:31 ` jirislaby at gmail dot com
2022-10-26  7:45 ` jakub at gcc dot gnu.org
2022-10-26  7:53 ` jirislaby at gmail dot com
2022-10-26  8:04 ` jakub at gcc dot gnu.org
2022-10-26  8:21 ` redi at gcc dot gnu.org
2022-10-26  8:39 ` jirislaby at gmail dot com
2022-10-26  8:49 ` jirislaby at gmail dot com
2022-10-26 16:55 ` [Bug c/107405] [13 Regression] enum change causing Linux kernel to fail to build due to Linux depending on old behavior pinskia at gcc dot gnu.org
2022-10-26 17:35 ` joseph at codesourcery dot com
2022-10-28 11:19 ` rguenth at gcc dot gnu.org
2022-11-19  8:43 ` jakub at gcc dot gnu.org
2022-11-19 13:18 ` macro at orcam dot me.uk
2022-11-19 20:46 ` jakub at gcc dot gnu.org
2022-11-21 18:10 ` joseph at codesourcery dot com
2022-11-22 14:53 ` macro at orcam dot me.uk
2022-11-22 22:47 ` joseph at codesourcery dot com
2022-11-29 14:57 ` pinskia at gcc dot gnu.org
2023-01-13 11:36 ` rguenth at gcc dot gnu.org
2023-03-24  9:27 ` rguenth at gcc dot gnu.org

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