From: Bruno Haible <bruno@clisp.org>
To: "Marc Nieper-Wißkirchen" <marc.nieper+gnu@gmail.com>
Cc: bug-gnulib@gnu.org
Subject: Re: Unused parameter warnings
Date: Sat, 10 Oct 2020 15:50:25 +0200 [thread overview]
Message-ID: <2217733.79xrSNMHMn@omega> (raw)
In-Reply-To: <CAEYrNrQtM5TPZgs279zmSCYTGO1RtG+Un1Hx6u=-oX6jJoW02A@mail.gmail.com>
Marc Nieper-Wißkirchen wrote:
> > And a function that may invoke abort () does "affect observable state".
>
> This description of the a pure function does not seem to be accurate.
> When a function calls another function like abort that is marked with
> _Noreturn in a pure context, for the compiler the function can still
> be pure (but not const). It can eliminate a second call to the
> function with the same parameters. I am pretty sure that the warning
> of GCC in line 938 is correct.
The documentation of ATTRIBUTE_PURE in Gnulib is taken from the GCC
documentation [1][2], therefore if you think it needs to be fixed, it's
through a GCC bug report.
Bruno
[1] https://lists.gnu.org/archive/html/bug-gnulib/2020-05/msg00105.html
[2] https://gcc.gnu.org/onlinedocs/gcc-10.2.0/gcc/Common-Function-Attributes.html
next prev parent reply other threads:[~2020-10-10 13:50 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-04 20:23 Unused parameter warnings Marc Nieper-Wißkirchen
2020-10-04 22:08 ` Bruno Haible
2020-10-06 5:58 ` Marc Nieper-Wißkirchen
2020-10-06 21:05 ` Bruno Haible
2020-10-07 6:07 ` Marc Nieper-Wißkirchen
2020-10-10 13:50 ` Bruno Haible [this message]
2020-10-10 14:31 ` Marc Nieper-Wißkirchen
2020-10-10 14:39 ` Bruno Haible
2020-10-10 15:00 ` Marc Nieper-Wißkirchen
2020-10-10 18:50 ` Paul Eggert
2020-10-10 21:00 ` Bruno Haible
2020-10-11 23:10 ` Paul Eggert
2020-10-12 2:21 ` Jeffrey Walton
2020-10-14 1:24 ` 'const' function attribute Bruno Haible
2020-10-14 14:57 ` Paul Eggert
2020-10-18 14:27 ` Bruno Haible
2020-10-10 20:43 ` Unused parameter warnings Bruno Haible
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