* [Bug target/44290] [4.5 regression] __naked attribute is broken
[not found] <bug-44290-4@http.gcc.gnu.org/bugzilla/>
@ 2010-12-15 22:11 ` belyshev at depni dot sinp.msu.ru
2010-12-16 3:06 ` jiez at gcc dot gnu.org
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From: belyshev at depni dot sinp.msu.ru @ 2010-12-15 22:11 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
Serge Belyshev <belyshev at depni dot sinp.msu.ru> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|REOPENED |WAITING
CC| |belyshev at depni dot
| |sinp.msu.ru
Known to work| |4.6.0
Summary|[4.5 only] __naked |[4.5 regression] __naked
|attribute is broken |attribute is broken
--- Comment #28 from Serge Belyshev <belyshev at depni dot sinp.msu.ru> 2010-12-15 22:10:42 UTC ---
I presume this is fixed on trunk, but still broken n 4.5 branch, is that
correct?
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* [Bug target/44290] [4.5 regression] __naked attribute is broken
[not found] <bug-44290-4@http.gcc.gnu.org/bugzilla/>
2010-12-15 22:11 ` [Bug target/44290] [4.5 regression] __naked attribute is broken belyshev at depni dot sinp.msu.ru
@ 2010-12-16 3:06 ` jiez at gcc dot gnu.org
2010-12-16 13:08 ` rguenth at gcc dot gnu.org
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From: jiez at gcc dot gnu.org @ 2010-12-16 3:06 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
--- Comment #29 from Jie Zhang <jiez at gcc dot gnu.org> 2010-12-16 03:05:53 UTC ---
Serge, yes. But GCC 4.5 branch is frozen now again.
^ permalink raw reply [flat|nested] 20+ messages in thread
* [Bug target/44290] [4.5 regression] __naked attribute is broken
[not found] <bug-44290-4@http.gcc.gnu.org/bugzilla/>
2010-12-15 22:11 ` [Bug target/44290] [4.5 regression] __naked attribute is broken belyshev at depni dot sinp.msu.ru
2010-12-16 3:06 ` jiez at gcc dot gnu.org
@ 2010-12-16 13:08 ` rguenth at gcc dot gnu.org
2010-12-16 20:47 ` belyshev at depni dot sinp.msu.ru
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From: rguenth at gcc dot gnu.org @ 2010-12-16 13:08 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.5.2 |4.5.3
--- Comment #30 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-12-16 13:02:52 UTC ---
GCC 4.5.2 is being released, adjusting target milestone.
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* [Bug target/44290] [4.5 regression] __naked attribute is broken
[not found] <bug-44290-4@http.gcc.gnu.org/bugzilla/>
` (2 preceding siblings ...)
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From: belyshev at depni dot sinp.msu.ru @ 2010-12-16 20:47 UTC (permalink / raw)
To: gcc-bugs
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Serge Belyshev <belyshev at depni dot sinp.msu.ru> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
Last reconfirmed|2010-05-29 11:42:59 |2010-12-16 3:05:53
Known to fail|4.5.0 |4.5.3
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* [Bug target/44290] [4.5 regression] __naked attribute is broken
[not found] <bug-44290-4@http.gcc.gnu.org/bugzilla/>
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To: gcc-bugs
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Serge Belyshev <belyshev at depni dot sinp.msu.ru> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
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* [Bug target/44290] [4.5 regression] __naked attribute is broken
[not found] <bug-44290-4@http.gcc.gnu.org/bugzilla/>
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From: jiez at gcc dot gnu.org @ 2010-12-21 4:16 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #31 from Jie Zhang <jiez at gcc dot gnu.org> 2010-12-21 04:16:19 UTC ---
Patch for 4.5 was posted:
http://gcc.gnu.org/ml/gcc-patches/2010-12/msg01351.html
Waiting for approval.
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* [Bug target/44290] [4.5 regression] __naked attribute is broken
[not found] <bug-44290-4@http.gcc.gnu.org/bugzilla/>
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@ 2011-04-10 10:27 ` rguenth at gcc dot gnu.org
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From: rguenth at gcc dot gnu.org @ 2011-04-10 10:27 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #32 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-04-10 10:27:30 UTC ---
Backporting regression fixes is generally fine and does not require explicit
approval (given that the patches do not need significant changes).
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* [Bug target/44290] [4.5 regression] __naked attribute is broken
[not found] <bug-44290-4@http.gcc.gnu.org/bugzilla/>
` (6 preceding siblings ...)
2011-04-10 10:27 ` rguenth at gcc dot gnu.org
@ 2011-04-28 15:35 ` rguenth at gcc dot gnu.org
2011-06-03 22:20 ` ramana at gcc dot gnu.org
2012-07-02 10:37 ` rguenth at gcc dot gnu.org
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From: rguenth at gcc dot gnu.org @ 2011-04-28 15:35 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.5.3 |4.5.4
--- Comment #33 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-04-28 14:51:08 UTC ---
GCC 4.5.3 is being released, adjusting target milestone.
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* [Bug target/44290] [4.5 regression] __naked attribute is broken
[not found] <bug-44290-4@http.gcc.gnu.org/bugzilla/>
` (7 preceding siblings ...)
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@ 2011-06-03 22:20 ` ramana at gcc dot gnu.org
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From: ramana at gcc dot gnu.org @ 2011-06-03 22:20 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ramana at gcc dot gnu.org
--- Comment #34 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> 2011-06-03 22:19:40 UTC ---
Jie ,
Are you still planning on backporting this ?
Ramana
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* [Bug target/44290] [4.5 regression] __naked attribute is broken
[not found] <bug-44290-4@http.gcc.gnu.org/bugzilla/>
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2011-06-03 22:20 ` ramana at gcc dot gnu.org
@ 2012-07-02 10:37 ` rguenth at gcc dot gnu.org
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From: rguenth at gcc dot gnu.org @ 2012-07-02 10:37 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
Target Milestone|4.5.4 |4.6.0
--- Comment #35 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-02 10:36:35 UTC ---
Fixed in 4.6.0, the 4.5 branch is being closed.
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* [Bug target/44290] [4.5 Regression] __naked attribute is broken
2010-05-27 6:26 [Bug tree-optimization/44290] New: arm linux kernel crahes when built with -fipa-sra raj dot khem at gmail dot com
@ 2010-05-29 14:45 ` rguenth at gcc dot gnu dot org
2010-05-29 14:46 ` rguenth at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2010-05-29 14:45 UTC (permalink / raw)
To: gcc-bugs
------- Comment #15 from rguenth at gcc dot gnu dot org 2010-05-29 14:45 -------
(In reply to comment #13)
> (In reply to comment #10)
> > Or rather, if you have
> >
> > void __attribute__((naked)) foo (int i)
> > {
> > asm("use i");
> > }
> >
> > without any inputs refering to i that is invalid.
>
> Not according to gcc/doc/extend.texi:
>
> > @item naked
> > @cindex function without a prologue/epilogue code
> > Use this attribute on the ARM, AVR, IP2K, RX and SPU ports to indicate that
> > the specified function does not need prologue/epilogue sequences generated by
> > the compiler. It is up to the programmer to provide these sequences. The
> > only statements that can be safely included in naked functions are
> > @code{asm} statements that do not have operands.
>
> Note: "do not have operands". Thus the only way such an asm() can refer to
> parameters is by assuming a standard function call sequence and hardcoding
> corresponding register numbers or stack frame offsets.
Then the target has to properly communicate this to the middle-end.
> However, even if the asm() refers to those parameters via "r"(...) inputs,
> gcc-4.5 changes the register assignment to not agree with the standard call
> sequence, I'll attach a small test case showing that in a moment.
I'd have required dummy inputs like "g" (kto), "g" (kfrom) not used by
the actual assembly.
For now re-open as a target bug.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|INVALID |
Summary|[4.5 Regression] arm linux |[4.5 Regression] __naked
|kernel crahes when built |attribute is broken
|with -fipa-sra, __naked |
|attribute is broken |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
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* [Bug target/44290] [4.5 Regression] __naked attribute is broken
2010-05-27 6:26 [Bug tree-optimization/44290] New: arm linux kernel crahes when built with -fipa-sra raj dot khem at gmail dot com
2010-05-29 14:45 ` [Bug target/44290] [4.5 Regression] __naked attribute is broken rguenth at gcc dot gnu dot org
@ 2010-05-29 14:46 ` rguenth at gcc dot gnu dot org
2010-05-29 14:47 ` mikpe at it dot uu dot se
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From: rguenth at gcc dot gnu dot org @ 2010-05-29 14:46 UTC (permalink / raw)
To: gcc-bugs
------- Comment #16 from rguenth at gcc dot gnu dot org 2010-05-29 14:46 -------
And CC a arm maintainer. There might be more target-specific attributes that
need adjustment.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rearnsha at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
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* [Bug target/44290] [4.5 Regression] __naked attribute is broken
2010-05-27 6:26 [Bug tree-optimization/44290] New: arm linux kernel crahes when built with -fipa-sra raj dot khem at gmail dot com
2010-05-29 14:45 ` [Bug target/44290] [4.5 Regression] __naked attribute is broken rguenth at gcc dot gnu dot org
2010-05-29 14:46 ` rguenth at gcc dot gnu dot org
@ 2010-05-29 14:47 ` mikpe at it dot uu dot se
2010-05-29 18:00 ` mikpe at it dot uu dot se
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From: mikpe at it dot uu dot se @ 2010-05-29 14:47 UTC (permalink / raw)
To: gcc-bugs
------- Comment #17 from mikpe at it dot uu dot se 2010-05-29 14:47 -------
Created an attachment (id=20772)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20772&action=view)
test case from copypage-xscale.c
This is distilled from the kernel's copypage-xscale.c file and illustrates the
issue. With gcc-4.4 the __naked__ function foo() is called with the standard
call sequence register assignment, so the asm() body of foo() works. With
gcc-4.5 foo() is cloned and gets its second parameter `to' in r0 (not r1 as
expected), and the body of foo() is modified to set up the actual first
parameter (&fie[0]) in r1 (not r0 as expected). Obviously the asm() then
breaks.
Compiling with -fno-ipa-cp avoids this problem, as does adding __noclone__ and
__noinline__ to foo()'s function definition.
I don't immediately see how to enforce __noclone__ and __noinline__ in the ARM
backend when it sees __naked__. Any ideas?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
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* [Bug target/44290] [4.5 Regression] __naked attribute is broken
2010-05-27 6:26 [Bug tree-optimization/44290] New: arm linux kernel crahes when built with -fipa-sra raj dot khem at gmail dot com
` (2 preceding siblings ...)
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@ 2010-05-29 18:00 ` mikpe at it dot uu dot se
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From: mikpe at it dot uu dot se @ 2010-05-29 18:00 UTC (permalink / raw)
To: gcc-bugs
------- Comment #18 from mikpe at it dot uu dot se 2010-05-29 18:00 -------
Created an attachment (id=20773)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20773&action=view)
linux kernel workaround for attribute naked breakage
This patch makes the Linux kernel add noinline and noclone attributes to
functions declared __naked. This allows gcc-4.5 to build a working 2.6.34
Linux kernel for my mach-iop32x/n2100 ARM box.
Khem: can you check if this kernel-side workaround fixes your problem?
Eventually I'd like the kernel to not use __naked, but that is non-trivial.
This fix should work now and be easily backportable to older kernels.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
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* [Bug target/44290] [4.5 Regression] __naked attribute is broken
2010-05-27 6:26 [Bug tree-optimization/44290] New: arm linux kernel crahes when built with -fipa-sra raj dot khem at gmail dot com
` (3 preceding siblings ...)
2010-05-29 18:00 ` mikpe at it dot uu dot se
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From: raj dot khem at gmail dot com @ 2010-05-30 5:58 UTC (permalink / raw)
To: gcc-bugs
------- Comment #19 from raj dot khem at gmail dot com 2010-05-30 05:58 -------
(In reply to comment #18)
> Created an attachment (id=20773)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20773&action=view) [edit]
> linux kernel workaround for attribute naked breakage
>
> This patch makes the Linux kernel add noinline and noclone attributes to
> functions declared __naked. This allows gcc-4.5 to build a working 2.6.34
> Linux kernel for my mach-iop32x/n2100 ARM box.
>
> Khem: can you check if this kernel-side workaround fixes your problem?
I have tried using __noclone__ a couple of days ago to workaround the problem
//static void __attribute__((__naked__, __noinline__, __noclone__,
__no_instrument_function__))
static void __attribute__((__naked__, __no_instrument_function__))
v4wb_copy_user_page(void *kto, const void *kfrom)
But my gcc seems to ignore it and its generating same code for both with Os and
O2 for both
above cases. Hence did not solve my issue.
I am using snapshot of 4.5 branch from May 20
>
> Eventually I'd like the kernel to not use __naked, but that is non-trivial.
> This fix should work now and be easily backportable to older kernels.
>
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
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* [Bug target/44290] [4.5 Regression] __naked attribute is broken
2010-05-27 6:26 [Bug tree-optimization/44290] New: arm linux kernel crahes when built with -fipa-sra raj dot khem at gmail dot com
` (4 preceding siblings ...)
2010-05-30 5:58 ` raj dot khem at gmail dot com
@ 2010-05-30 6:55 ` raj dot khem at gmail dot com
2010-05-30 17:04 ` rguenth at gcc dot gnu dot org
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From: raj dot khem at gmail dot com @ 2010-05-30 6:55 UTC (permalink / raw)
To: gcc-bugs
------- Comment #20 from raj dot khem at gmail dot com 2010-05-30 06:54 -------
Created an attachment (id=20777)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20777&action=view)
includes fix for all arms
I see the problem after reading Richard's comment #10, here is some more
additions to kernel workaround patch which work for me too.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
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* [Bug target/44290] [4.5 Regression] __naked attribute is broken
2010-05-27 6:26 [Bug tree-optimization/44290] New: arm linux kernel crahes when built with -fipa-sra raj dot khem at gmail dot com
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From: rguenth at gcc dot gnu dot org @ 2010-05-30 17:04 UTC (permalink / raw)
To: gcc-bugs
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
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* [Bug target/44290] [4.5 Regression] __naked attribute is broken
2010-05-27 6:26 [Bug tree-optimization/44290] New: arm linux kernel crahes when built with -fipa-sra raj dot khem at gmail dot com
` (6 preceding siblings ...)
2010-05-30 17:04 ` rguenth at gcc dot gnu dot org
@ 2010-07-23 14:48 ` jiez at gcc dot gnu dot org
2010-07-23 14:51 ` jiez at gcc dot gnu dot org
2010-07-23 14:52 ` jiez at gcc dot gnu dot org
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From: jiez at gcc dot gnu dot org @ 2010-07-23 14:48 UTC (permalink / raw)
To: gcc-bugs
------- Comment #21 from jiez at gcc dot gnu dot org 2010-07-23 14:48 -------
Subject: Bug 44290
Author: jiez
Date: Fri Jul 23 14:47:46 2010
New Revision: 162466
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162466
Log:
PR target/44290
* attribs.c (decl_attributes): Insert "noinline" and "noclone"
if "naked".
* tree-sra.c (ipa_sra_preliminary_function_checks): Return
false if ! tree_versionable_function_p.
testsuite/
PR target/44290
* gcc.dg/pr44290-1.c: New test.
* gcc.dg/pr44290-2.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr44290-1.c
trunk/gcc/testsuite/gcc.dg/pr44290-2.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/attribs.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-sra.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
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* [Bug target/44290] [4.5 Regression] __naked attribute is broken
2010-05-27 6:26 [Bug tree-optimization/44290] New: arm linux kernel crahes when built with -fipa-sra raj dot khem at gmail dot com
` (7 preceding siblings ...)
2010-07-23 14:48 ` jiez at gcc dot gnu dot org
@ 2010-07-23 14:51 ` jiez at gcc dot gnu dot org
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From: jiez at gcc dot gnu dot org @ 2010-07-23 14:51 UTC (permalink / raw)
To: gcc-bugs
------- Comment #22 from jiez at gcc dot gnu dot org 2010-07-23 14:51 -------
Should be fixed on trunk now.
--
jiez at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |jiez at gcc dot gnu dot org
|dot org |
Status|REOPENED |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
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* [Bug target/44290] [4.5 Regression] __naked attribute is broken
2010-05-27 6:26 [Bug tree-optimization/44290] New: arm linux kernel crahes when built with -fipa-sra raj dot khem at gmail dot com
` (8 preceding siblings ...)
2010-07-23 14:51 ` jiez at gcc dot gnu dot org
@ 2010-07-23 14:52 ` jiez at gcc dot gnu dot org
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From: jiez at gcc dot gnu dot org @ 2010-07-23 14:52 UTC (permalink / raw)
To: gcc-bugs
------- Comment #23 from jiez at gcc dot gnu dot org 2010-07-23 14:52 -------
Set the status to FIXED.
--
jiez at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44290
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