http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56258
Bruce Dubbs changed:
What|Removed |Added
CC||bdubbs at linuxfromscratch
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54475
Bug #: 54475
Summary: -O2 overoptimizes
Classification: Unclassified
Product: gcc
Version: 4.7.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component:
iority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: bdubbs at linuxfromscratch dot org
GCC build triplet: x86_64-unknown-linux-gnu
GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu
http://gcc.gnu.or
--- Comment #2 from bdubbs at linuxfromscratch dot org 2010-05-14 21:27
---
OK, these are my procedures:
svn co svn://gcc.gnu.org/svn/gcc/branches/gcc-4_5-branch gcc45-svn
(revision 159398)
cd gcc45-svn
sed -i 's/install_to_$(INSTALL_DEST) //' libiberty/Makefile.in
--- Comment #5 from bdubbs at linuxfromscratch dot org 2010-05-14 22:50
---
(In reply to comment #4)
> I saw you have tried revision 159398. I guess you
> need to find which file is miscompiled.
I have no idea how to do that for the kernel.
> BTW, you aren't using gol
--- Comment #7 from bdubbs at linuxfromscratch dot org 2010-05-15 04:06
---
(In reply to comment #6)
> You build 2 kernel trees, one with gcc 4.5.1 and one
> with gcc 4.4.4. You copy binaries from one tree to
> another and rebuild kernel one file at a time until
> you fin
--- Comment #8 from bdubbs at linuxfromscratch dot org 2010-05-16 05:55
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Created an attachment (id=20671)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20671&action=view)
Linux kernel configuration that fails with gcc-4.5
--
http://gcc.gnu.org/bugzilla/show_bug
--- Comment #9 from bdubbs at linuxfromscratch dot org 2010-05-16 06:38
---
I have traced the problem file for this bug to the kernel file
arch/x86/kernel/tsc.c
I have two source trees for the 2.6.33.4 kernel, one compiled with gcc-4.4.1
which works and gcc version 4.5.1 20100514
--- Comment #11 from bdubbs at linuxfromscratch dot org 2010-05-24 06:32
---
Updated to gcc (GCC) 4.5.1 20100524 (prerelease) but still have the problem.
There is something about -Os that triggers the kernel panic in
arch/x86/kernel/tsc.c
I tried to disable all -O2 options after -Os
--- Comment #14 from bdubbs at linuxfromscratch dot org 2010-05-31 00:41
---
(In reply to comment #13)
> (In reply to comment #12)
> > I'm assuming this is current Linus git (post 2.6.34).
>
> I'm guessing from
>
> >Tested on several kernel
--- Comment #17 from bdubbs at linuxfromscratch dot org 2010-06-19 00:05
---
I can confirm that changing inline to __always_inline in
arch/x86/include/asm/system.h fixed the panic for me.
I'm not sure if this fix is the result of an error in the kernel or gcc.
Leaving the bug ope
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