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* [Bug c/24016] Missing warning for unspecified evaluation order
[not found] <bug-24016-4@http.gcc.gnu.org/bugzilla/>
@ 2015-05-23 6:09 ` miyuki at gcc dot gnu.org
2015-05-23 13:45 ` mpolacek at gcc dot gnu.org
2021-12-31 1:58 ` egallager at gcc dot gnu.org
2 siblings, 0 replies; 5+ messages in thread
From: miyuki at gcc dot gnu.org @ 2015-05-23 6:09 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24016
Mikhail Maltsev <miyuki at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |miyuki at gcc dot gnu.org
--- Comment #3 from Mikhail Maltsev <miyuki at gcc dot gnu.org> ---
It seems to me that __extension__ also inhibits some other useful warnings. For
example:
#include <string.h>
int foo(void *x) {
return strcmp(x + 1, "test");
}
does not cause warnings when compiled with -Wpointer-arith -O1 (glibc v. 2.17).
It can be reduced to:
int foo(void *x) {
return __extension__({ __builtin_strcmp(x + 1, "test"); });
}
Note, that we do warn about
int foo(void *x) {
return ({ __builtin_strcmp(x + 1, "test"); });
}
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug c/24016] Missing warning for unspecified evaluation order
[not found] <bug-24016-4@http.gcc.gnu.org/bugzilla/>
2015-05-23 6:09 ` miyuki at gcc dot gnu.org
@ 2015-05-23 13:45 ` mpolacek at gcc dot gnu.org
2021-12-31 1:58 ` egallager at gcc dot gnu.org
2 siblings, 0 replies; 5+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-05-23 13:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24016
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mpolacek at gcc dot gnu.org
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Since arithmetic on void * (treating sizeof(void) as 1) is a GNU extension,
that behavior is desirable.
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug c/24016] Missing warning for unspecified evaluation order
[not found] <bug-24016-4@http.gcc.gnu.org/bugzilla/>
2015-05-23 6:09 ` miyuki at gcc dot gnu.org
2015-05-23 13:45 ` mpolacek at gcc dot gnu.org
@ 2021-12-31 1:58 ` egallager at gcc dot gnu.org
2 siblings, 0 replies; 5+ messages in thread
From: egallager at gcc dot gnu.org @ 2021-12-31 1:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24016
Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Manuel López-Ibáñez from comment #2)
> (In reply to comment #1)
> >
> > It is, however, at least unspecified order of evaluation and a warning
> > here would still make sense.
> >
>
> A candidate for -Wsequence-points ?
...or a new flag?
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-12-31 1:58 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <bug-24016-6528@http.gcc.gnu.org/bugzilla/>
2005-11-26 7:50 ` [Bug c/24016] Missing warning for unspecified evaluation order gdr at gcc dot gnu dot org
2007-03-12 17:48 ` manu at gcc dot gnu dot org
[not found] <bug-24016-4@http.gcc.gnu.org/bugzilla/>
2015-05-23 6:09 ` miyuki at gcc dot gnu.org
2015-05-23 13:45 ` mpolacek at gcc dot gnu.org
2021-12-31 1:58 ` egallager at gcc dot gnu.org
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