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* [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
@ 2012-05-08 9:00 jgpallero at gmail dot com
2012-05-08 16:06 ` [Bug c/53277] " pinskia at gcc dot gnu.org
` (19 more replies)
0 siblings, 20 replies; 21+ messages in thread
From: jgpallero at gmail dot com @ 2012-05-08 9:00 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
Bug #: 53277
Summary: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and
4.7 but not in previous releases
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: jgpallero@gmail.com
Hello:
In this example:
#include<stdlib.h>
#include<string.h>
int main() {
strspn("hello","h");
return 0;
}
I obtain the warning:
test.c:4:5: warning: conversion to ‘size_t’ from ‘int’ may change the sign of
the result [-Wsign-conversion]
using the order:
gcc -Wall -Wextra -Wconversion -O test.c -o test
The warning appears with -O, -O1, -O2 and -O3, but not with -O0. The
warning appears in gcc 4.5, 4.6 and 4.7 but not in previous releases.
This behavior appears too if I do some assign:
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
int main() {
size_t x;
x = strspn("hello","h");
printf("%zd\n", x);
return 0;
}
I think this is a bug
Cheers
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
@ 2012-05-08 16:06 ` pinskia at gcc dot gnu.org
2012-05-09 10:51 ` jgpallero at gmail dot com
` (18 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: pinskia at gcc dot gnu.org @ 2012-05-08 16:06 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2012-05-08
Ever Confirmed|0 |1
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-05-08 16:02:36 UTC ---
Can you attach the preprocessed source? I think the headers have a macro
function for strspn .
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
2012-05-08 16:06 ` [Bug c/53277] " pinskia at gcc dot gnu.org
@ 2012-05-09 10:51 ` jgpallero at gmail dot com
2012-05-09 10:52 ` jgpallero at gmail dot com
` (17 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: jgpallero at gmail dot com @ 2012-05-09 10:51 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
--- Comment #2 from José Luis García Pallero <jgpallero at gmail dot com> 2012-05-09 10:50:35 UTC ---
Created attachment 27354
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27354
Original C code
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (2 preceding siblings ...)
2012-05-09 10:52 ` jgpallero at gmail dot com
@ 2012-05-09 10:52 ` jgpallero at gmail dot com
2012-05-09 10:53 ` jgpallero at gmail dot com
` (15 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: jgpallero at gmail dot com @ 2012-05-09 10:52 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
--- Comment #4 from José Luis García Pallero <jgpallero at gmail dot com> 2012-05-09 10:51:52 UTC ---
Created attachment 27356
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27356
Preprocessed with -O1 optimization flag
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
2012-05-08 16:06 ` [Bug c/53277] " pinskia at gcc dot gnu.org
2012-05-09 10:51 ` jgpallero at gmail dot com
@ 2012-05-09 10:52 ` jgpallero at gmail dot com
2012-05-09 10:52 ` jgpallero at gmail dot com
` (16 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: jgpallero at gmail dot com @ 2012-05-09 10:52 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
--- Comment #3 from José Luis García Pallero <jgpallero at gmail dot com> 2012-05-09 10:51:15 UTC ---
Created attachment 27355
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27355
Preprocessed with -O0 optimization flag
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (3 preceding siblings ...)
2012-05-09 10:52 ` jgpallero at gmail dot com
@ 2012-05-09 10:53 ` jgpallero at gmail dot com
2012-05-09 10:54 ` jgpallero at gmail dot com
` (14 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: jgpallero at gmail dot com @ 2012-05-09 10:53 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
--- Comment #5 from José Luis García Pallero <jgpallero at gmail dot com> 2012-05-09 10:52:50 UTC ---
Created attachment 27357
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27357
Preprocessed with -O2 optimization flag
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (4 preceding siblings ...)
2012-05-09 10:53 ` jgpallero at gmail dot com
@ 2012-05-09 10:54 ` jgpallero at gmail dot com
2012-05-09 10:56 ` jgpallero at gmail dot com
` (13 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: jgpallero at gmail dot com @ 2012-05-09 10:54 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
--- Comment #6 from José Luis García Pallero <jgpallero at gmail dot com> 2012-05-09 10:53:19 UTC ---
Created attachment 27358
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27358
Preprocessed with -O3 optimization flag
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (5 preceding siblings ...)
2012-05-09 10:54 ` jgpallero at gmail dot com
@ 2012-05-09 10:56 ` jgpallero at gmail dot com
2012-05-09 11:06 ` jgpallero at gmail dot com
` (12 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: jgpallero at gmail dot com @ 2012-05-09 10:56 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
--- Comment #7 from José Luis García Pallero <jgpallero at gmail dot com> 2012-05-09 10:54:33 UTC ---
Hello:
I attach the preprocessed files with optimization flags -O0, -O1, -O2 and -O3
Thanks
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (6 preceding siblings ...)
2012-05-09 10:56 ` jgpallero at gmail dot com
@ 2012-05-09 11:06 ` jgpallero at gmail dot com
2012-05-09 12:07 ` glisse at gcc dot gnu.org
` (11 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: jgpallero at gmail dot com @ 2012-05-09 11:06 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
--- Comment #8 from José Luis García Pallero <jgpallero at gmail dot com> 2012-05-09 10:56:34 UTC ---
I have used gcc 4.7.0
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (7 preceding siblings ...)
2012-05-09 11:06 ` jgpallero at gmail dot com
@ 2012-05-09 12:07 ` glisse at gcc dot gnu.org
2012-05-09 12:54 ` manu at gcc dot gnu.org
` (10 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: glisse at gcc dot gnu.org @ 2012-05-09 12:07 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |glisse at gcc dot gnu.org
--- Comment #9 from Marc Glisse <glisse at gcc dot gnu.org> 2012-05-09 11:50:09 UTC ---
glibc still has:
# define strspn(s, accept) \
__extension__ \
({ char __a0, __a1, __a2; \
(__builtin_constant_p (accept) && __string2_1bptr_p (accept) \
? ((__builtin_constant_p (s) && __string2_1bptr_p (s)) \
? __builtin_strspn (s, accept) \
: ((__a0 = ((const char *) (accept))[0], __a0 == '\0') \
? ((void) (s), 0) \
: ((__a1 = ((const char *) (accept))[1], __a1 == '\0') \
? __strspn_c1 (s, __a0) \
: ((__a2 = ((const char *) (accept))[2], __a2 == '\0') \
? __strspn_c2 (s, __a0, __a1) \
: (((const char *) (accept))[3] == '\0' \
? __strspn_c3 (s, __a0, __a1, __a2) \
: __builtin_strspn (s, accept)))))) \
: __builtin_strspn (s, accept)); })
The lone 0 in the middle should be explicitly cast to size_t, like it is for
fread_unlocked. Could you report it to glibc please?
gcc could avoid this warning when converting a constant, I am pretty sure the
same issue (possibly with another macro) already led to such a conversation...
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (8 preceding siblings ...)
2012-05-09 12:07 ` glisse at gcc dot gnu.org
@ 2012-05-09 12:54 ` manu at gcc dot gnu.org
2012-05-09 13:11 ` jgpallero at gmail dot com
` (9 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: manu at gcc dot gnu.org @ 2012-05-09 12:54 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |manu at gcc dot gnu.org
--- Comment #10 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-05-09 12:45:54 UTC ---
(In reply to comment #9)
> gcc could avoid this warning when converting a constant, I am pretty sure the
> same issue (possibly with another macro) already led to such a conversation...
This is not a constant. It is a conditional expression of type int. This is
PR51294.
And there is PR52617. Plenty of bugs to fix...
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (9 preceding siblings ...)
2012-05-09 12:54 ` manu at gcc dot gnu.org
@ 2012-05-09 13:11 ` jgpallero at gmail dot com
2012-05-09 13:12 ` glisse at gcc dot gnu.org
` (8 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: jgpallero at gmail dot com @ 2012-05-09 13:11 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
--- Comment #11 from José Luis García Pallero <jgpallero at gmail dot com> 2012-05-09 13:06:56 UTC ---
Report to glibc sent
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (10 preceding siblings ...)
2012-05-09 13:11 ` jgpallero at gmail dot com
@ 2012-05-09 13:12 ` glisse at gcc dot gnu.org
2012-05-09 13:46 ` manu at gcc dot gnu.org
` (7 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: glisse at gcc dot gnu.org @ 2012-05-09 13:12 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
--- Comment #12 from Marc Glisse <glisse at gcc dot gnu.org> 2012-05-09 13:11:01 UTC ---
(In reply to comment #10)
> This is PR51294.
Looks different. Here the compiler complains about casting 0 to size_t.
> And there is PR52617.
That one is not a bug, unless you want to do the opposite of what the OP asked
and use constant propagation to remove the current warning as well.
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (11 preceding siblings ...)
2012-05-09 13:12 ` glisse at gcc dot gnu.org
@ 2012-05-09 13:46 ` manu at gcc dot gnu.org
2012-05-09 15:17 ` jgpallero at gmail dot com
` (6 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: manu at gcc dot gnu.org @ 2012-05-09 13:46 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
--- Comment #13 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-05-09 13:34:15 UTC ---
(In reply to comment #12)
> (In reply to comment #10)
> > This is PR51294.
>
> Looks different. Here the compiler complains about casting 0 to size_t.
No, it is not. GCC gives a very different message for implicit constant
conversions.
Looking in more detail, I think the problem may be ((void)s, 0), which is not
recognized as a constant by Wconversion.
> > And there is PR52617.
>
> That one is not a bug, unless you want to do the opposite of what the OP asked
> and use constant propagation to remove the current warning as well.
You are right. Closed.
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (12 preceding siblings ...)
2012-05-09 13:46 ` manu at gcc dot gnu.org
@ 2012-05-09 15:17 ` jgpallero at gmail dot com
2012-05-09 15:56 ` [Bug c/53277] -Wconversion cannot handle compound expresions manu at gcc dot gnu.org
` (5 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: jgpallero at gmail dot com @ 2012-05-09 15:17 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
--- Comment #14 from José Luis García Pallero <jgpallero at gmail dot com> 2012-05-09 15:01:30 UTC ---
Fixed in glibc:
http://sourceware.org/bugzilla/show_bug.cgi?id=14083
http://sourceware.org/git/?p=glibc.git;a=commit;h=1a4b75a190006bb013a61f2031a4de86e93a629f
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] -Wconversion cannot handle compound expresions
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (13 preceding siblings ...)
2012-05-09 15:17 ` jgpallero at gmail dot com
@ 2012-05-09 15:56 ` manu at gcc dot gnu.org
2021-07-20 17:16 ` [Bug c/53277] -Wconversion cannot handle compound expressions me at xenu dot pl
` (4 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: manu at gcc dot gnu.org @ 2012-05-09 15:56 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
--- Comment #15 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-05-09 15:52:48 UTC ---
A simpler testcase:
int main() {
char i = 1;
char x = ((void) i, 0);
x = i ? x : ((void) i, 0);
return 0;
}
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] -Wconversion cannot handle compound expressions
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (14 preceding siblings ...)
2012-05-09 15:56 ` [Bug c/53277] -Wconversion cannot handle compound expresions manu at gcc dot gnu.org
@ 2021-07-20 17:16 ` me at xenu dot pl
2021-07-20 17:33 ` me at xenu dot pl
` (3 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: me at xenu dot pl @ 2021-07-20 17:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
Tomasz Konojacki <me at xenu dot pl> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |me at xenu dot pl
--- Comment #17 from Tomasz Konojacki <me at xenu dot pl> ---
Manuel's simplified testcase was fixed in gcc 10. I believe this ticket can be
closed.
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] -Wconversion cannot handle compound expressions
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (15 preceding siblings ...)
2021-07-20 17:16 ` [Bug c/53277] -Wconversion cannot handle compound expressions me at xenu dot pl
@ 2021-07-20 17:33 ` me at xenu dot pl
2021-07-20 17:41 ` redi at gcc dot gnu.org
` (2 subsequent siblings)
19 siblings, 0 replies; 21+ messages in thread
From: me at xenu dot pl @ 2021-07-20 17:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
--- Comment #18 from Tomasz Konojacki <me at xenu dot pl> ---
Sorry, it still warns in C mode, but it doesn't in C++.
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] -Wconversion cannot handle compound expressions
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (16 preceding siblings ...)
2021-07-20 17:33 ` me at xenu dot pl
@ 2021-07-20 17:41 ` redi at gcc dot gnu.org
2021-07-20 17:42 ` pinskia at gcc dot gnu.org
2023-06-15 0:34 ` pinskia at gcc dot gnu.org
19 siblings, 0 replies; 21+ messages in thread
From: redi at gcc dot gnu.org @ 2021-07-20 17:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
--- Comment #19 from Jonathan Wakely <redi at gcc dot gnu.org> ---
For C++ the comment 15 case seems to have been fixed by r10-6527:
c++: Use constexpr to avoid wrong -Wsign-compare (PR90691).
We would like to do constexpr evaluation to avoid false positives on
warnings, but constexpr evaluation can involve function body copying that
changes DECL_UID, which breaks -fcompare-debug. So let's remember
that we need to avoid that.
PR c++/90691
* expr.c (fold_for_warn): Call maybe_constant_value.
* constexpr.c (struct constexpr_ctx): Add uid_sensitive field.
(maybe_constant_value): Add uid_sensitive parm.
(get_fundef_copy): Don't copy if it's true.
(cxx_eval_call_expression): Don't instantiate if it's true.
(cxx_eval_outermost_constant_expr): Likewise.
But it still warns when compiled as C.
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] -Wconversion cannot handle compound expressions
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (17 preceding siblings ...)
2021-07-20 17:41 ` redi at gcc dot gnu.org
@ 2021-07-20 17:42 ` pinskia at gcc dot gnu.org
2023-06-15 0:34 ` pinskia at gcc dot gnu.org
19 siblings, 0 replies; 21+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-07-20 17:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
--- Comment #20 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Tomasz Konojacki from comment #18)
> Sorry, it still warns in C mode, but it doesn't in C++.
Yes it does, but only the second one of:
char x = ((void) i, 0);
x = i ? x : ((void) i, 0);
The first one was fixed for GCC 10.
^ permalink raw reply [flat|nested] 21+ messages in thread
* [Bug c/53277] -Wconversion cannot handle compound expressions
2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
` (18 preceding siblings ...)
2021-07-20 17:42 ` pinskia at gcc dot gnu.org
@ 2023-06-15 0:34 ` pinskia at gcc dot gnu.org
19 siblings, 0 replies; 21+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-06-15 0:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |roland.illig at gmx dot de
--- Comment #21 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 110259 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 21+ messages in thread
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2012-05-08 9:00 [Bug c/53277] New: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and 4.7 but not in previous releases jgpallero at gmail dot com
2012-05-08 16:06 ` [Bug c/53277] " pinskia at gcc dot gnu.org
2012-05-09 10:51 ` jgpallero at gmail dot com
2012-05-09 10:52 ` jgpallero at gmail dot com
2012-05-09 10:52 ` jgpallero at gmail dot com
2012-05-09 10:53 ` jgpallero at gmail dot com
2012-05-09 10:54 ` jgpallero at gmail dot com
2012-05-09 10:56 ` jgpallero at gmail dot com
2012-05-09 11:06 ` jgpallero at gmail dot com
2012-05-09 12:07 ` glisse at gcc dot gnu.org
2012-05-09 12:54 ` manu at gcc dot gnu.org
2012-05-09 13:11 ` jgpallero at gmail dot com
2012-05-09 13:12 ` glisse at gcc dot gnu.org
2012-05-09 13:46 ` manu at gcc dot gnu.org
2012-05-09 15:17 ` jgpallero at gmail dot com
2012-05-09 15:56 ` [Bug c/53277] -Wconversion cannot handle compound expresions manu at gcc dot gnu.org
2021-07-20 17:16 ` [Bug c/53277] -Wconversion cannot handle compound expressions me at xenu dot pl
2021-07-20 17:33 ` me at xenu dot pl
2021-07-20 17:41 ` redi at gcc dot gnu.org
2021-07-20 17:42 ` pinskia at gcc dot gnu.org
2023-06-15 0:34 ` pinskia at gcc dot gnu.org
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