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* [Bug c/39693] Warning about uninitialized local variable use
[not found] <bug-39693-4@http.gcc.gnu.org/bugzilla/>
@ 2013-10-27 1:05 ` manu at gcc dot gnu.org
0 siblings, 0 replies; 5+ messages in thread
From: manu at gcc dot gnu.org @ 2013-10-27 1:05 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39693
--- Comment #6 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Igor, your testcase is exactly PR18501. No fix in sight unfortunately.
>From gcc-bugs-return-432819-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Oct 27 01:15:33 2013
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From: "manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/58890] Doesn't generate warning about potentially uninitialized variable
Date: Sun, 27 Oct 2013 01:15:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58890
Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |manu at gcc dot gnu.org
Resolution|--- |DUPLICATE
--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Exactly 18501. No fix in sight unfortunately.
*** This bug has been marked as a duplicate of bug 18501 ***
>From gcc-bugs-return-432818-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Oct 27 01:15:33 2013
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From: "manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/18501] [4.7/4.8/4.9 Regression] Missing 'used uninitialized' warning (CCP)
Date: Sun, 27 Oct 2013 01:15:00 -0000
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |igor.shevlyakov at gmail dot com
--- Comment #66 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
*** Bug 58890 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-432820-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Oct 27 04:03:07 2013
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From: "mcree at orcon dot net.nz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/58892] New: ICE in combine.c when using -Os on alpha
Date: Sun, 27 Oct 2013 04:03:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58892
Bug ID: 58892
Summary: ICE in combine.c when using -Os on alpha
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: mcree at orcon dot net.nz
Target: alpha
Created attachment 31096
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31096&action=edit
Preprocessed C source that causes ICE.
While compiling linux kernel for Alpha get ICE in combine.c:711 when compiling
drivers/media/dvb-core/dvb-demux.c.
Attached preprocessed source from that compilation. Established that it is the
use of -Os that leads to the ICE. Namely running:
gcc-4.8 -nostdinc -Os -c ices.c
generates the following output:
In file included from
/home/mjc/debian/linux/linux-3.11.5/include/linux/thread_info.h:54:0,
from
/home/mjc/debian/linux/linux-3.11.5/include/linux/preempt.h:9,
from
/home/mjc/debian/linux/linux-3.11.5/include/linux/spinlock.h:50,
from
/home/mjc/debian/linux/linux-3.11.5/include/linux/seqlock.h:29,
from
/home/mjc/debian/linux/linux-3.11.5/include/linux/time.h:5,
from
/home/mjc/debian/linux/linux-3.11.5/include/uapi/linux/timex.h:56,
from
/home/mjc/debian/linux/linux-3.11.5/include/linux/timex.h:56,
from
/home/mjc/debian/linux/linux-3.11.5/include/linux/sched.h:17,
from
/home/mjc/debian/linux/linux-3.11.5/drivers/media/dvb-core/dvb_demux.c:24:
/home/mjc/debian/linux/linux-3.11.5/arch/alpha/include/asm/thread_info.h:52:30:
warning: call-clobbered register used for global register variable [enabled by
default]
register struct thread_info *__current_thread_info __asm__("$8");
^
/home/mjc/debian/linux/linux-3.11.5/drivers/media/dvb-core/dvb_demux.c: In
function ‘dvb_dmx_swfilter_packet’:
/home/mjc/debian/linux/linux-3.11.5/drivers/media/dvb-core/dvb_demux.c:474:1:
internal compiler error: in do_SUBST, at combine.c:711
}
^
Compilation is sucessful without -Os option or with -O1. ICE reappears if
compile with -O2. ICE only occurs with gcc-4.8 (Debian 4.8.2-1) but not
gcc-4.6 or gcc-4.7 so looks like a regression.
>From gcc-bugs-return-432821-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Oct 27 06:25:25 2013
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From: "bernd.edlinger at hotmail dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/58508] [Missed-Optimization] Redundant vector load of "actual" loop invariant in loop body.
Date: Sun, 27 Oct 2013 06:25:00 -0000
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Bernd Edlinger <bernd.edlinger at hotmail dot de> changed:
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CC| |bernd.edlinger at hotmail dot de
--- Comment #4 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
Hi,
the test case is failing on a i686-pc-linux-gnu.
Reason: by default the -msse2 is not enabled.
If I add -msse2 to dg_options the test passes.
Regards
Bernd.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/39693] Warning about uninitialized local variable use
2009-04-09 9:17 [Bug c/39693] New: " simon dot thum at gmx dot de
` (2 preceding siblings ...)
2009-04-09 13:15 ` simon dot thum at gmx dot de
@ 2009-04-09 13:25 ` manu at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: manu at gcc dot gnu dot org @ 2009-04-09 13:25 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from manu at gcc dot gnu dot org 2009-04-09 13:25 -------
(In reply to comment #3)
> BTW in developer docs, -Wextra still mentions -Wuninitialized; it seems to me
> this is not intentional.
>
Both -Wall and -Wextra enable Wuninitialized. I guess this is historical.
Please, in the future, when you make assertions like the above, be more
specific: provide a link, or a file name and a section title. Otherwise it is
not completely clear what "developer docs" actually means or where in the
developer docs says what you say it says.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39693
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/39693] Warning about uninitialized local variable use
2009-04-09 9:17 [Bug c/39693] New: " simon dot thum at gmx dot de
2009-04-09 12:08 ` [Bug c/39693] " manu at gcc dot gnu dot org
2009-04-09 13:11 ` simon dot thum at gmx dot de
@ 2009-04-09 13:15 ` simon dot thum at gmx dot de
2009-04-09 13:25 ` manu at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: simon dot thum at gmx dot de @ 2009-04-09 13:15 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from simon dot thum at gmx dot de 2009-04-09 13:15 -------
BTW in developer docs, -Wextra still mentions -Wuninitialized; it seems to me
this is not intentional.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39693
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/39693] Warning about uninitialized local variable use
2009-04-09 9:17 [Bug c/39693] New: " simon dot thum at gmx dot de
2009-04-09 12:08 ` [Bug c/39693] " manu at gcc dot gnu dot org
@ 2009-04-09 13:11 ` simon dot thum at gmx dot de
2009-04-09 13:15 ` simon dot thum at gmx dot de
2009-04-09 13:25 ` manu at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: simon dot thum at gmx dot de @ 2009-04-09 13:11 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from simon dot thum at gmx dot de 2009-04-09 13:11 -------
Sorry for the noise; I didn't check the developer docs (just latest release)...
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39693
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/39693] Warning about uninitialized local variable use
2009-04-09 9:17 [Bug c/39693] New: " simon dot thum at gmx dot de
@ 2009-04-09 12:08 ` manu at gcc dot gnu dot org
2009-04-09 13:11 ` simon dot thum at gmx dot de
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: manu at gcc dot gnu dot org @ 2009-04-09 12:08 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from manu at gcc dot gnu dot org 2009-04-09 12:08 -------
The bugs you mention are fixed.
In GCC 4.4, some uninitialized uses are reported even at -O0. If you have
specific testcases not covered by any PR linked in bug 24639, then open a new
PR and attach the preprocessed testcase. What you propose is already covered in
bug 24639 and in http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings
--
manu at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |manu at gcc dot gnu dot org
Status|UNCONFIRMED |RESOLVED
Resolution| |WORKSFORME
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39693
^ permalink raw reply [flat|nested] 5+ messages in thread
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2013-10-27 1:05 ` [Bug c/39693] Warning about uninitialized local variable use manu at gcc dot gnu.org
2009-04-09 9:17 [Bug c/39693] New: " simon dot thum at gmx dot de
2009-04-09 12:08 ` [Bug c/39693] " manu at gcc dot gnu dot org
2009-04-09 13:11 ` simon dot thum at gmx dot de
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