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* [Bug c/48544] New: "might be clobbered by ‘longjmp’" diagnostic for unmodified variable
@ 2011-04-10 19:15 adl at gnu dot org
2015-08-20 11:22 ` [Bug middle-end/48544] " adl at gnu dot org
0 siblings, 1 reply; 2+ messages in thread
From: adl at gnu dot org @ 2011-04-10 19:15 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48544
Summary: "might be clobbered by ‘longjmp’" diagnostic for
unmodified variable
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: adl@gnu.org
Created attachment 23939
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23939
preprocessed input
% uname -a
Linux hush 2.6.32-5-amd64 #1 SMP Wed Jan 12 03:40:32 UTC 2011 x86_64 GNU/Linux
% gcc-4.6 --version
gcc-4.6 (Debian 4.6.0-2) 4.6.1 20110329 (prerelease)
Copyright (C) 2011 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.
% cat foo.c
#include <setjmp.h>
jmp_buf env;
void foo(int);
int bar(int r, int var)
{
if (var)
return r;
if (setjmp(env) == 0)
foo(r);
return 0;
}
% gcc-4.6 -Wall -Wextra -O2 -c foo.c
foo.c: In function ‘bar’:
foo.c:6:13: warning: argument ‘r’ might be clobbered by ‘longjmp’ or ‘vfork’
[-Wclobbered]
If I understand this message correctly, GCC is warning me that "r" might be
reset to the value it had before calling setjmp(). However, I never changed
the value of "r", so I don't think this warning should be emitted.
Note that removing the "if (var) return r;" lines makes the warning go away.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug middle-end/48544] "might be clobbered by ‘longjmp’" diagnostic for unmodified variable
2011-04-10 19:15 [Bug c/48544] New: "might be clobbered by ‘longjmp’" diagnostic for unmodified variable adl at gnu dot org
@ 2015-08-20 11:22 ` adl at gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: adl at gnu dot org @ 2015-08-20 11:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48544
--- Comment #1 from Alexandre Duret-Lutz <adl at gnu dot org> ---
This works OK with 4.8 and 5.1, so not an issue anymore as far as I'm
concerned.
(Might be related to #48968 which is reported as "half-fixed" -- I haven't
tried.)
^ permalink raw reply [flat|nested] 2+ messages in thread
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2011-04-10 19:15 [Bug c/48544] New: "might be clobbered by ‘longjmp’" diagnostic for unmodified variable adl at gnu dot org
2015-08-20 11:22 ` [Bug middle-end/48544] " adl at gnu dot org
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