Re: Linux kernel cross-compilers

[Guenter Roeck]

On 08/16/2013 01:31 AM, Max Filippov wrote:
> On Fri, Aug 16, 2013 at 11:50 AM, Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> > On 08/16/2013 12:22 AM, Max Filippov wrote:
> > > On Fri, Aug 16, 2013 at 9:48 AM, Tony Breeds <tony@xxxxxxxxxxxxxxxxxx>
> > > wrote:
> > > > On Thu, Aug 15, 2013 at 01:46:16PM +0400, Max Filippov wrote:
> > > >
> > > > > Yes, xtensa compiler/linker is known to have issues with link-time
> > > > > relaxation; e.g. it may fail to build linux image without
> > > > > CONFIG_LD_NO_RELAX.
> > > >
> > > >
> > > > Is there something I can do at linker build time to help with this?
> > >
> > >
> > > I don't think so. Apparently it's not a linker configuration issue, it's a
> > > bug.
> > CONFIG_LD_NO_RELAX doesn't help.
> >
> > For reference, here is the error:
> >
> > xtensa-linux-objcopy: Unable to change endianness of input file(s)
> > make[2]: *** [arch/xtensa/boot/boot-elf/Image.o] Error 1
> > make[1]: *** [boot-elf] Error 2
> > make: *** [zImage] Error 2
> >
> > Oddly enough, I only see the problem on one of three servers.
>
> Guenter,
> can you share a complete build log with V=1?

http://roeck-us.net/linux/logs/make.xtensa.log.bad
http://roeck-us.net/linux/logs/make.xtensa.log.ok

Key difference: the failing command in the bad case is
	xtensa-linux-objcopy -O elf32-xtensa-le
and in the good case
	xtensa-linux-objcopy -O elf32-xtensa-be

Same compiler (4.6.3 from kernel.org), same configuration file, same command line.
Configuration file is generated from defconfig, and the resulting .config file
is the same in both cases.

If I execute make and expicitly set BIG_ENDIAN=1 on the failing system as parameter to it,
it works fine. If I set BIG_ENDIAN=0 on the passing system, it fails.

I am puzzled. Guess there must be something different, but I have no idea what it might be.

If I execute the command which sets BIG_ENDIAN manually from the shell (from
arch/xtensa/boot/Makefile), it returns 1 on both systems.

If you have an idea what is going on please let me know.

Thanks,
Guenter

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