binutils: regression on kernel builds

binutils: regression on kernel builds

[Enrico Scholz]

Hi,

with recent binutils, kernel build fails with

| arm-linux-gnueabi-ld: error: arch/arm/boot/compressed/piggy.gzip.o: unknown CPU architecture

I am able to reproduce it with

$ > /tmp/x.s
$ arm-linux-gnueabi-as  -march=armv7-a -march=all -o x0.o /tmp/x.s
$ arm-linux-gnueabi-as  -march=armv7-a  -o x1.o /tmp/x.s
$ arm-linux-gnueabi-ld.gold x0.o x1.o
arm-linux-gnueabi-ld: error: x1.o: unknown CPU architecture
$ arm-linux-gnueabi-ld.bfd x0.o x1.o
arm-linux-gnueabi-ld.bfd: warning: cannot find entry symbol _start; defaulting to 0000000000008034


(kernel sets '-Wa,-march=all' when building piggy.gzip.o)


This works fine with binutils 2.22 and when using the BFD linker.



Enrico

Re: binutils: regression on kernel builds

[Khem Raj]

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yes gold is showing some regressions see another one here
http://sourceware.org/bugzilla/show_bug.cgi?id=14592
cant promise but will take a look. meanwhile if you can triage
it would be nice.


On Mon, Dec 10, 2012 at 3:48 AM, Enrico Scholz <
enrico.scholz@sigma-chemnitz.de> wrote:

> Hi,
>
> with recent binutils, kernel build fails with
>
> | arm-linux-gnueabi-ld: error: arch/arm/boot/compressed/piggy.gzip.o:
> unknown CPU architecture
>
> I am able to reproduce it with
>
> $ > /tmp/x.s
> $ arm-linux-gnueabi-as  -march=armv7-a -march=all -o x0.o /tmp/x.s
> $ arm-linux-gnueabi-as  -march=armv7-a  -o x1.o /tmp/x.s
> $ arm-linux-gnueabi-ld.gold x0.o x1.o
> arm-linux-gnueabi-ld: error: x1.o: unknown CPU architecture
> $ arm-linux-gnueabi-ld.bfd x0.o x1.o
> arm-linux-gnueabi-ld.bfd: warning: cannot find entry symbol _start;
> defaulting to 0000000000008034
>
>
> (kernel sets '-Wa,-march=all' when building piggy.gzip.o)
>
>
> This works fine with binutils 2.22 and when using the BFD linker.
>
>
>
> Enrico
>

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Re: binutils: regression on kernel builds

[Martin Jansa]

On Mon, Dec 10, 2012 at 12:48 PM, Enrico Scholz
<enrico.scholz@sigma-chemnitz.de> wrote:
> Hi,
>
> with recent binutils, kernel build fails with
>
> | arm-linux-gnueabi-ld: error: arch/arm/boot/compressed/piggy.gzip.o: unknown CPU architecture
>
> I am able to reproduce it with
>
> $ > /tmp/x.s
> $ arm-linux-gnueabi-as  -march=armv7-a -march=all -o x0.o /tmp/x.s
> $ arm-linux-gnueabi-as  -march=armv7-a  -o x1.o /tmp/x.s
> $ arm-linux-gnueabi-ld.gold x0.o x1.o
> arm-linux-gnueabi-ld: error: x1.o: unknown CPU architecture
> $ arm-linux-gnueabi-ld.bfd x0.o x1.o
> arm-linux-gnueabi-ld.bfd: warning: cannot find entry symbol _start; defaulting to 0000000000008034
>
>
> (kernel sets '-Wa,-march=all' when building piggy.gzip.o)
>
>
> This works fine with binutils 2.22 and when using the BFD linker.

You need to patch your kernel sources, some examples for different
kernel versions (please ignore incorrect commit message)

https://github.com/shr-distribution/linux/commit/e465ff7527fb085b4854b0e68aa6bc592229bf43
https://github.com/shr-distribution/linux/commit/627c638794d61c27858d6220cf55c27c74dc9450
https://github.com/shr-distribution/linux/commit/37b0bacc00e81811dc113265a9ef826fe9aab788
https://github.com/shr-distribution/linux/commit/ec1ac589d49081286164246fbaaba0012ae7ecac

Cheers,

Re: binutils: regression on kernel builds

[Enrico Scholz]

Martin Jansa <martin.jansa@gmail.com> writes:

>> | arm-linux-gnueabi-ld: error: arch/arm/boot/compressed/piggy.gzip.o: unknown CPU architecture
>> ...
>> This works fine with binutils 2.22 and when using the BFD linker.
>
> You need to patch your kernel sources, some examples for different
> kernel versions (please ignore incorrect commit message)

I am not sure who (gold linker or kernel) is the responsible party.  But
based on my experiences with low level programs (e.g. bootloaders and
kernel) which are having serious problems with the gold linker, I set
for now

| KERNEL_LDSUFFIX = .bfd



Enrico

Re: binutils: regression on kernel builds

[Martin Jansa]

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On Wed, Dec 12, 2012 at 02:01:36PM +0100, Enrico Scholz wrote:
> Martin Jansa <martin.jansa@gmail.com> writes:
> 
> >> | arm-linux-gnueabi-ld: error: arch/arm/boot/compressed/piggy.gzip.o: unknown CPU architecture
> >> ...
> >> This works fine with binutils 2.22 and when using the BFD linker.
> >
> > You need to patch your kernel sources, some examples for different
> > kernel versions (please ignore incorrect commit message)
> 
> I am not sure who (gold linker or kernel) is the responsible party.  But
> based on my experiences with low level programs (e.g. bootloaders and
> kernel) which are having serious problems with the gold linker, I set
> for now
> 
> | KERNEL_LDSUFFIX = .bfd

FWIW: those patches I've referenced work for me fine (last 4 months
since binutils-2.23 patches first appeared on ML) on all 4 devices I'm using.

Cheers,

-- 
Martin 'JaMa' Jansa     jabber: Martin.Jansa@gmail.com

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