#2662: gcc 4.5.0 -Os does not generate correct code
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Reporter: bdu...@… | Owner: bdu...@…
Type: defect | Status: assigned
Priority: high | Milestone: 6.7
Component: Book | Version: SVN
Severity: major | Keywords:
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Comment(by bdu...@…):
Replying to [comment:7 hohoxu_hao115]:
> I think this bug is hardware dependent.My kernel compiled by gcc-4.5 for
x86_64,with or without size optimization,has no problems.
Thanks for the feedback. The obvious question is "Did it boot properly."
The build normally completes, but the kernel panics upon boot.
Can you post the results of `cat \proc\cpuinfo`
It would also help if you could run the following from the kernel
directory:
gcc -Wp,-MD,arch/x86/kernel/.tsc.o.d -nostdinc -isystem
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.5.1/include
-I/sources/linux-2.6.33.4-gcc45/arch/x86/include -Iinclude -include
include/generated/autoconf.h -D__KERNEL__ -Wall -Wundef -Wstrict-
prototypes
-Wno-trigraphs -fno-strict-aliasing -fno-common
-Werror-implicit-function-declaration -Wno-format-security
-fno-delete-null-pointer-checks -Os -m64 -march=core2 -mno-red-zone
-mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args
-DCONFIG_AS_CFI=1
-DCONFIG_AS_CFI_SIGNAL_FRAME=1 -pipe -Wno-sign-compare
-fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
-Wframe-larger-than=2048 -fno-stack-protector -fno-omit-frame-pointer
-fno-optimize-sibling-calls -Wdeclaration-after-statement -Wno-pointer-
sign
-fno-strict-overflow -fno-dwarf2-cfi-asm -fconserve-stack -fno-stack-
protector
-D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(tsc)"
-D"KBUILD_MODNAME=KBUILD_STR(tsc)" -S -c -o arch/x86/kernel/tsc.S
arch/x86/kernel/tsc.c
and post arch/x86/kernel/tsc.S as an attachment
If you can check your log of the build, where arch/x86/kernel/tsc.c is
built, does it match the above build string?
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Ticket URL: <http://wiki.linuxfromscratch.org/lfs/ticket/2662#comment:8>
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