* [Bug middle-end/40943] [4.4/4.5 Regression] Uninitialized warning is missed when dereferencing uninitialized pointers
2009-08-02 19:35 [Bug middle-end/40943] New: Uninitialized warning is missed when dereferencing uninitialized pointers mikulas at artax dot karlin dot mff dot cuni dot cz
@ 2009-08-02 21:42 ` rguenth at gcc dot gnu dot org
2009-08-03 13:10 ` jakub at gcc dot gnu dot org
` (7 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2009-08-02 21:42 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from rguenth at gcc dot gnu dot org 2009-08-02 21:42 -------
Confirmed. I see no technical reason for this.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Keywords| |diagnostic
Known to fail| |4.4.1 4.5.0
Known to work| |4.3.3
Last reconfirmed|0000-00-00 00:00:00 |2009-08-02 21:42:12
date| |
Summary|Uninitialized warning is |[4.4/4.5 Regression]
|missed when dereferencing |Uninitialized warning is
|uninitialized pointers |missed when dereferencing
| |uninitialized pointers
Target Milestone|--- |4.4.2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40943
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug middle-end/40943] [4.4/4.5 Regression] Uninitialized warning is missed when dereferencing uninitialized pointers
2009-08-02 19:35 [Bug middle-end/40943] New: Uninitialized warning is missed when dereferencing uninitialized pointers mikulas at artax dot karlin dot mff dot cuni dot cz
2009-08-02 21:42 ` [Bug middle-end/40943] [4.4/4.5 Regression] " rguenth at gcc dot gnu dot org
@ 2009-08-03 13:10 ` jakub at gcc dot gnu dot org
2009-08-03 13:41 ` jakub at gcc dot gnu dot org
` (6 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-08-03 13:10 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from jakub at gcc dot gnu dot org 2009-08-03 13:10 -------
Broken by Manu's PR179 changes:
http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=139347
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40943
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug middle-end/40943] [4.4/4.5 Regression] Uninitialized warning is missed when dereferencing uninitialized pointers
2009-08-02 19:35 [Bug middle-end/40943] New: Uninitialized warning is missed when dereferencing uninitialized pointers mikulas at artax dot karlin dot mff dot cuni dot cz
2009-08-02 21:42 ` [Bug middle-end/40943] [4.4/4.5 Regression] " rguenth at gcc dot gnu dot org
2009-08-03 13:10 ` jakub at gcc dot gnu dot org
@ 2009-08-03 13:41 ` jakub at gcc dot gnu dot org
2009-08-03 13:44 ` rguenth at gcc dot gnu dot org
` (5 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-08-03 13:41 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from jakub at gcc dot gnu dot org 2009-08-03 13:41 -------
Created an attachment (id=18289)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18289&action=view)
gcc45-pr40943.patch
Untested fix. It breaks uninit-6*.c again though, but "fixing" this kind of
false positive by simply disabling uninitialized warnings for all pointer
dereferences on LHS is IMHO too big hammer.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40943
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug middle-end/40943] [4.4/4.5 Regression] Uninitialized warning is missed when dereferencing uninitialized pointers
2009-08-02 19:35 [Bug middle-end/40943] New: Uninitialized warning is missed when dereferencing uninitialized pointers mikulas at artax dot karlin dot mff dot cuni dot cz
` (2 preceding siblings ...)
2009-08-03 13:41 ` jakub at gcc dot gnu dot org
@ 2009-08-03 13:44 ` rguenth at gcc dot gnu dot org
2009-08-03 14:07 ` manu at gcc dot gnu dot org
` (4 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2009-08-03 13:44 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from rguenth at gcc dot gnu dot org 2009-08-03 13:44 -------
Since the alias-improvements branch merge uninitialized warnings for aggregates
are seriously broken implementation wise anyway.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40943
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug middle-end/40943] [4.4/4.5 Regression] Uninitialized warning is missed when dereferencing uninitialized pointers
2009-08-02 19:35 [Bug middle-end/40943] New: Uninitialized warning is missed when dereferencing uninitialized pointers mikulas at artax dot karlin dot mff dot cuni dot cz
` (3 preceding siblings ...)
2009-08-03 13:44 ` rguenth at gcc dot gnu dot org
@ 2009-08-03 14:07 ` manu at gcc dot gnu dot org
2009-08-03 16:23 ` jakub at gcc dot gnu dot org
` (3 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: manu at gcc dot gnu dot org @ 2009-08-03 14:07 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from manu at gcc dot gnu dot org 2009-08-03 14:07 -------
(In reply to comment #3)
> Created an attachment (id=18289)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18289&action=view) [edit]
> gcc45-pr40943.patch
>
> Untested fix. It breaks uninit-6*.c again though, but "fixing" this kind of
> false positive by simply disabling uninitialized warnings for all pointer
> dereferences on LHS is IMHO too big hammer.
>
I was testing the exactly same patch, you posted first, so the honor is yours.
:-)
Notice that you should not need -O2 for testing this. The testcase should work
even with -O0.
Notice that uninit-6 is a missed optimization. Even with -O2, the unreachable
use of field is still present in the code shown by
uninit-6-O0.c.136t.optimized, so it seems the tree optimizers do not handle
this case. My patch only hide the symptom (the warning) but the missed
optimization was still there so we could xfail it again.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40943
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug middle-end/40943] [4.4/4.5 Regression] Uninitialized warning is missed when dereferencing uninitialized pointers
2009-08-02 19:35 [Bug middle-end/40943] New: Uninitialized warning is missed when dereferencing uninitialized pointers mikulas at artax dot karlin dot mff dot cuni dot cz
` (4 preceding siblings ...)
2009-08-03 14:07 ` manu at gcc dot gnu dot org
@ 2009-08-03 16:23 ` jakub at gcc dot gnu dot org
2009-08-03 19:26 ` jakub at gcc dot gnu dot org
` (2 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-08-03 16:23 UTC (permalink / raw)
To: gcc-bugs
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |jakub at gcc dot gnu dot org
|dot org |
Status|NEW |ASSIGNED
Last reconfirmed|2009-08-02 21:42:12 |2009-08-03 16:22:45
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40943
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug middle-end/40943] [4.4/4.5 Regression] Uninitialized warning is missed when dereferencing uninitialized pointers
2009-08-02 19:35 [Bug middle-end/40943] New: Uninitialized warning is missed when dereferencing uninitialized pointers mikulas at artax dot karlin dot mff dot cuni dot cz
` (5 preceding siblings ...)
2009-08-03 16:23 ` jakub at gcc dot gnu dot org
@ 2009-08-03 19:26 ` jakub at gcc dot gnu dot org
2009-08-03 19:28 ` jakub at gcc dot gnu dot org
2009-08-03 19:32 ` jakub at gcc dot gnu dot org
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-08-03 19:26 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from jakub at gcc dot gnu dot org 2009-08-03 19:26 -------
Subject: Bug 40943
Author: jakub
Date: Mon Aug 3 19:26:10 2009
New Revision: 150379
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=150379
Log:
PR middle-end/40943
* tree-ssa.c (warn_uninitialized_var): Even on LHS warn for
operand of INDIRECT_REF.
* gcc.dg/uninit-6.c: Re-add XFAIL.
* gcc.dg/uninit-6-O0.c: Likewise.
* gcc.dg/uninit-pr40943.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/uninit-pr40943.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/uninit-6-O0.c
trunk/gcc/testsuite/gcc.dg/uninit-6.c
trunk/gcc/tree-ssa.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40943
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug middle-end/40943] [4.4/4.5 Regression] Uninitialized warning is missed when dereferencing uninitialized pointers
2009-08-02 19:35 [Bug middle-end/40943] New: Uninitialized warning is missed when dereferencing uninitialized pointers mikulas at artax dot karlin dot mff dot cuni dot cz
` (6 preceding siblings ...)
2009-08-03 19:26 ` jakub at gcc dot gnu dot org
@ 2009-08-03 19:28 ` jakub at gcc dot gnu dot org
2009-08-03 19:32 ` jakub at gcc dot gnu dot org
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-08-03 19:28 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from jakub at gcc dot gnu dot org 2009-08-03 19:27 -------
Subject: Bug 40943
Author: jakub
Date: Mon Aug 3 19:27:32 2009
New Revision: 150380
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=150380
Log:
PR middle-end/40943
* tree-ssa.c (warn_uninitialized_var): Even on LHS warn for
operand of INDIRECT_REF.
* gcc.dg/uninit-6.c: Re-add XFAIL.
* gcc.dg/uninit-6-O0.c: Likewise.
* gcc.dg/uninit-pr40943.c: New test.
Added:
branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/uninit-pr40943.c
Modified:
branches/gcc-4_4-branch/gcc/ChangeLog
branches/gcc-4_4-branch/gcc/testsuite/ChangeLog
branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/uninit-6-O0.c
branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/uninit-6.c
branches/gcc-4_4-branch/gcc/tree-ssa.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40943
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug middle-end/40943] [4.4/4.5 Regression] Uninitialized warning is missed when dereferencing uninitialized pointers
2009-08-02 19:35 [Bug middle-end/40943] New: Uninitialized warning is missed when dereferencing uninitialized pointers mikulas at artax dot karlin dot mff dot cuni dot cz
` (7 preceding siblings ...)
2009-08-03 19:28 ` jakub at gcc dot gnu dot org
@ 2009-08-03 19:32 ` jakub at gcc dot gnu dot org
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-08-03 19:32 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from jakub at gcc dot gnu dot org 2009-08-03 19:32 -------
Fixed.
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40943
^ permalink raw reply [flat|nested] 10+ messages in thread