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* [Bug c/109792] New: RFE: Warn about misuse of "pure" attribute
@ 2023-05-09 18:05 xry111 at gcc dot gnu.org
2023-05-09 18:05 ` [Bug c/109792] " xry111 at gcc dot gnu.org
2023-05-09 18:07 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: xry111 at gcc dot gnu.org @ 2023-05-09 18:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109792
Bug ID: 109792
Summary: RFE: Warn about misuse of "pure" attribute
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: xry111 at gcc dot gnu.org
Target Milestone: ---
I've spent several hours on https://github.com/systemd/systemd/pull/27595,
which fixes a wrong use of the "pure" attribute. Consider the following:
$ cat t.c
extern int t(const char *, int *);
int t(const char *a, int *b)
{
if (!a)
return 114;
*b = __builtin_strlen(a);
return 0;
}
$ gcc t.c -S -Wall -Wextra -Werror && echo "no warning"
no warning
$ gcc t.c -S -Wall -Wextra -Werror -O1 && echo "no warning"
no warning
$ gcc t.c -S -Wall -Wextra -Werror -O2 && echo "no warning"
no warning
$ gcc t.c -S -Wall -Wextra -Werror -O3 && echo "no warning"
no warning
$ gcc t.c -S -Wall -Wextra -Werror -O3 -fanalyzer && echo "no warning"
no warning
If we had a warning here, it would have saved me several hours :).
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/109792] RFE: Warn about misuse of "pure" attribute
2023-05-09 18:05 [Bug c/109792] New: RFE: Warn about misuse of "pure" attribute xry111 at gcc dot gnu.org
@ 2023-05-09 18:05 ` xry111 at gcc dot gnu.org
2023-05-09 18:07 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: xry111 at gcc dot gnu.org @ 2023-05-09 18:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109792
Xi Ruoyao <xry111 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
Keywords| |diagnostic
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/109792] RFE: Warn about misuse of "pure" attribute
2023-05-09 18:05 [Bug c/109792] New: RFE: Warn about misuse of "pure" attribute xry111 at gcc dot gnu.org
2023-05-09 18:05 ` [Bug c/109792] " xry111 at gcc dot gnu.org
@ 2023-05-09 18:07 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-05-09 18:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109792
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 18487.
*** This bug has been marked as a duplicate of bug 18487 ***
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-05-09 18:07 UTC | newest]
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2023-05-09 18:05 [Bug c/109792] New: RFE: Warn about misuse of "pure" attribute xry111 at gcc dot gnu.org
2023-05-09 18:05 ` [Bug c/109792] " xry111 at gcc dot gnu.org
2023-05-09 18:07 ` pinskia at gcc dot gnu.org
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