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* [Bug c/58217] New: warning when assigning a function pointer field in a structure having the may_alias attribute
@ 2013-08-22 10:06 zer0@droids-corp.org
2013-08-22 10:07 ` [Bug c/58217] " zer0@droids-corp.org
2013-08-22 10:08 ` zer0@droids-corp.org
0 siblings, 2 replies; 3+ messages in thread
From: zer0@droids-corp.org @ 2013-08-22 10:06 UTC (permalink / raw)
To: gcc-bugs
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58217
Bug ID: 58217
Summary: warning when assigning a function pointer field in a
structure having the may_alias attribute
Product: gcc
Version: 4.7.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: zer0@droids-corp.org
Host: x86_64
Target: x86_64
Hello,
When compiling the attached code, I get the following error:
$ gcc -Wall -Wextra foo.c
foo.c: In function âmainâ:
foo.c:16:16: warning: assignment from incompatible pointer type [enabled by
default]
If I remove the "__attribute__((may_alias))", it compiles. A workaround it
to cast the cb function pointer in (void *) before doing the affectation. In my
opinion, this warning is not expected here. Sorry if I missed something.
I also tried:
$ gcc -Wall -Wextra -fno-strict-aliasing -fwrapv foo.c
foo.c: In function âmainâ:
foo.c:16:16: warning: assignment from incompatible pointer type [enabled by
default]
$ gcc --version
gcc (Debian 4.7.3-4) 4.7.3
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
I can reproduce the problem on several gcc versions 4.4, 4.5, 4.6 at least.
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From: "zer0@droids-corp.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/58217] warning when assigning a function pointer field in a structure having the may_alias attribute
Date: Thu, 22 Aug 2013 10:07:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idX217
--- Comment #2 from Olivier MATZ <zer0@droids-corp.org> ---
Created attachment 30686
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id0686&actioníit
gcc -dumpspecs
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/58217] warning when assigning a function pointer field in a structure having the may_alias attribute
2013-08-22 10:06 [Bug c/58217] New: warning when assigning a function pointer field in a structure having the may_alias attribute zer0@droids-corp.org
@ 2013-08-22 10:07 ` zer0@droids-corp.org
2013-08-22 10:08 ` zer0@droids-corp.org
1 sibling, 0 replies; 3+ messages in thread
From: zer0@droids-corp.org @ 2013-08-22 10:07 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58217
--- Comment #1 from Olivier MATZ <zer0@droids-corp.org> ---
Created attachment 30685
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30685&action=edit
code that triggers the issue
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/58217] warning when assigning a function pointer field in a structure having the may_alias attribute
2013-08-22 10:06 [Bug c/58217] New: warning when assigning a function pointer field in a structure having the may_alias attribute zer0@droids-corp.org
2013-08-22 10:07 ` [Bug c/58217] " zer0@droids-corp.org
@ 2013-08-22 10:08 ` zer0@droids-corp.org
1 sibling, 0 replies; 3+ messages in thread
From: zer0@droids-corp.org @ 2013-08-22 10:08 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58217
--- Comment #3 from Olivier MATZ <zer0@droids-corp.org> ---
Created attachment 30687
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30687&action=edit
intermediate file foo.i
^ permalink raw reply [flat|nested] 3+ messages in thread
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2013-08-22 10:06 [Bug c/58217] New: warning when assigning a function pointer field in a structure having the may_alias attribute zer0@droids-corp.org
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2013-08-22 10:08 ` zer0@droids-corp.org
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