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bug#49261: Segfault during loadup
From: |
Eli Zaretskii |
Subject: |
bug#49261: Segfault during loadup |
Date: |
Wed, 14 Jul 2021 15:36:11 +0300 |
> Cc: larsi@gnus.org, 49261@debbugs.gnu.org
> From: Paul Eggert <eggert@cs.ucla.edu>
> Date: Tue, 13 Jul 2021 18:12:00 -0500
>
> On 7/12/21 10:54 AM, Eli Zaretskii wrote:
> > Then what is the -Woverflow option for? Can you show an example of
> > code which -Woverflow would flag that doesn't produce a bogus warning?
>
> Sure: the GCC documentation says -Woverflow is supposed to warn about
> "compile-time overflow in constant expressions". So GCC should (and
> does) warn about this top-level declaration:
>
> int x = INT_MAX + 1;
>
> However, there is no overflow here:
>
> unsigned a = -1, b = INT_MIN, c = LLONG_MAX;
You are saying that there's some fundamental difference between
INT_MAX + 1
and
(USE_LSB_TAG ? - (1 << GCTYPEBITS) : VAL_MAX)
? Or between an expression 'x = FOO' and 'mask = BAR'? I don't see
any fundamental difference. IMO, the warning was valid, as the
assignment loses significant bits.
- bug#49261: Segfault during loadup, (continued)
- bug#49261: Segfault during loadup, Eli Zaretskii, 2021/07/11
- bug#49261: Segfault during loadup, Paul Eggert, 2021/07/12
- bug#49261: Segfault during loadup, Eli Zaretskii, 2021/07/12
- bug#49261: Segfault during loadup, Paul Eggert, 2021/07/12
- bug#49261: Segfault during loadup, Andreas Schwab, 2021/07/12
- bug#49261: Segfault during loadup, Eli Zaretskii, 2021/07/12
- bug#49261: Segfault during loadup, Paul Eggert, 2021/07/13
- bug#49261: Segfault during loadup, Andreas Schwab, 2021/07/14
- bug#49261: Segfault during loadup, Paul Eggert, 2021/07/14
- bug#49261: Segfault during loadup, Andreas Schwab, 2021/07/14
- bug#49261: Segfault during loadup,
Eli Zaretskii <=
- bug#49261: Segfault during loadup, Paul Eggert, 2021/07/14
- bug#49261: Segfault during loadup, Eli Zaretskii, 2021/07/15
- bug#49261: Segfault during loadup, Lars Ingebrigtsen, 2021/07/11
- bug#49261: 28.0.50; File Locking Breaks Presumptuous Toolchains, Eli Zaretskii, 2021/07/08
- bug#49261: 28.0.50; File Locking Breaks Presumptuous Toolchains, Eli Zaretskii, 2021/07/08
- bug#49261: 28.0.50; File Locking Breaks Presumptuous Toolchains, Lars Ingebrigtsen, 2021/07/08
- bug#49261: 28.0.50; File Locking Breaks Presumptuous Toolchains, Lars Ingebrigtsen, 2021/07/08
- bug#49261: 28.0.50; File Locking Breaks Presumptuous Toolchains, Eli Zaretskii, 2021/07/08
- bug#49261: 28.0.50; File Locking Breaks Presumptuous Toolchains, Eli Zaretskii, 2021/07/08
- bug#49261: 28.0.50; File Locking Breaks Presumptuous Toolchains, Lars Ingebrigtsen, 2021/07/08