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* [Bug c/49848] New: False positive warning triggered by -Wmaybe-uninitialized
@ 2011-07-26 1:29 lacombar at gmail dot com
2011-07-26 1:31 ` [Bug c/49848] " lacombar at gmail dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: lacombar at gmail dot com @ 2011-07-26 1:29 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49848
Summary: False positive warning triggered by
-Wmaybe-uninitialized
Product: gcc
Version: 4.5.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: lacombar@gmail.com
Considering the attached reduced-testcase, gcc will trigger the following
warning:
% gcc -m32 -Wall -Os -c -S -o /dev/null foo.c
foo.c: In function 'foo':
foo.c:9:12: warning: 'b' may be used uninitialized in this function
Affected gcc is:
% gcc -v
Using built-in specs.
[...]
Thread model: posix
gcc version 4.5.1 20100924 (Red Hat 4.5.1-4) (GCC)
however, gcc from trunk (as of 20110609) also produces the warning:
/src/x86-64/obj/destdir/bin/x86_64-none-linux-gcc -m32 -Wall -Os -c -S -o
/dev/null foo.c
foo.c: In function 'foo':
foo.c:14:21: warning: 'b' may be used uninitialized in this function
[-Wmaybe-uninitialized]
This warning only shows up at -Os.
Mailing list reference: http://gcc.gnu.org/ml/gcc-help/2011-07/msg00243.html
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug c/49848] False positive warning triggered by -Wmaybe-uninitialized 2011-07-26 1:29 [Bug c/49848] New: False positive warning triggered by -Wmaybe-uninitialized lacombar at gmail dot com @ 2011-07-26 1:31 ` lacombar at gmail dot com 2011-07-26 2:16 ` [Bug middle-end/49848] " pinskia at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: lacombar at gmail dot com @ 2011-07-26 1:31 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49848 --- Comment #1 from Arnaud Lacombe <lacombar at gmail dot com> 2011-07-26 01:31:07 UTC --- Created attachment 24834 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24834 reduced testcase ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/49848] False positive warning triggered by -Wmaybe-uninitialized 2011-07-26 1:29 [Bug c/49848] New: False positive warning triggered by -Wmaybe-uninitialized lacombar at gmail dot com 2011-07-26 1:31 ` [Bug c/49848] " lacombar at gmail dot com @ 2011-07-26 2:16 ` pinskia at gcc dot gnu.org 2012-10-25 0:13 ` manu at gcc dot gnu.org 2013-11-20 1:13 ` law at redhat dot com 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2011-07-26 2:16 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49848 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|c |middle-end --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-07-26 02:15:38 UTC --- This is a semi standard issue with uninitialized variable warnings. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/49848] False positive warning triggered by -Wmaybe-uninitialized 2011-07-26 1:29 [Bug c/49848] New: False positive warning triggered by -Wmaybe-uninitialized lacombar at gmail dot com 2011-07-26 1:31 ` [Bug c/49848] " lacombar at gmail dot com 2011-07-26 2:16 ` [Bug middle-end/49848] " pinskia at gcc dot gnu.org @ 2012-10-25 0:13 ` manu at gcc dot gnu.org 2013-11-20 1:13 ` law at redhat dot com 3 siblings, 0 replies; 5+ messages in thread From: manu at gcc dot gnu.org @ 2012-10-25 0:13 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49848 Manuel López-Ibáñez <manu at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2012-10-25 CC| |manu at gcc dot gnu.org Blocks| |24639 Ever Confirmed|0 |1 --- Comment #3 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-10-25 00:12:34 UTC --- Still present in GCC 4.8.0pr49848.c: In function ‘foo’: pr49848.c:14:21: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (a != NULL && b != NULL) ^ ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/49848] False positive warning triggered by -Wmaybe-uninitialized 2011-07-26 1:29 [Bug c/49848] New: False positive warning triggered by -Wmaybe-uninitialized lacombar at gmail dot com ` (2 preceding siblings ...) 2012-10-25 0:13 ` manu at gcc dot gnu.org @ 2013-11-20 1:13 ` law at redhat dot com 3 siblings, 0 replies; 5+ messages in thread From: law at redhat dot com @ 2013-11-20 1:13 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49848 Jeffrey A. Law <law at redhat dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED CC| |law at redhat dot com Resolution|--- |DUPLICATE --- Comment #4 from Jeffrey A. Law <law at redhat dot com> --- Another case where throttling optimizations inhibits accurate warnings. *** This bug has been marked as a duplicate of bug 42145 *** ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2013-11-20 1:13 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2011-07-26 1:29 [Bug c/49848] New: False positive warning triggered by -Wmaybe-uninitialized lacombar at gmail dot com 2011-07-26 1:31 ` [Bug c/49848] " lacombar at gmail dot com 2011-07-26 2:16 ` [Bug middle-end/49848] " pinskia at gcc dot gnu.org 2012-10-25 0:13 ` manu at gcc dot gnu.org 2013-11-20 1:13 ` law at redhat dot com
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