Re: [PATCH] powerpc: allow cross-compilation of ppc64 kernel

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From	Laurent Vivier <laurent@vivier.eu>
Newsgroups	linux.kernel
Subject	Re: [PATCH] powerpc: allow cross-compilation of ppc64 kernel
Date	Sat, 07 Nov 2015 12:40:02 +0100
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Le 07/11/2015 00:12, Benjamin Herrenschmidt a écrit :
> On Fri, 2015-11-06 at 15:09 -0600, Scott Wood wrote:
>> On Thu, 2015-11-05 at 12:47 +0100, Laurent Vivier wrote:
>>> When I try to cross compile a ppc64 kernel, it generally
>>> fails on the VDSO stage. This is true for powerpc64 cross-
>>> compiler, but also when I try to build a ppc64le kernel
>>> on a ppc64 host.
>>>
>>> VDSO64L fails:
>>>
>>>   VDSO64L arch/powerpc/kernel/vdso64/vdso64.so.dbg
>>> /usr/bin/powerpc64-linux-gnu-ld:
>>> arch/powerpc/kernel/vdso64/sigtramp.o:
>>> file class ELFCLASS64 incompatible with ELFCLASS32
>>> /usr/bin/powerpc64-linux-gnu-ld: final link failed: File in wrong
>>> format
>>>
>>> This fails because gcc calls "collect2" with
>>> "--oformat elf32-powerpcle" with ppc64 objects, without the
>>> "--oformat" ld works well because it use the format of the
>>> first object as output format.
>>>
>>> As this case is correctly managed to build the other kernel
>>> objects, this patch replaces $(GCC) by $(LD) to generate the
>>> VDSO objects.
> 
> This is LE ? I think that's a bug in binutils or gcc ... I remember we
> fought that a while ago for the openpower builds. It might have been
> fixed in upstream toolchain.

Yes, Segher has given me the commit id. It is just what I need.

Laurent
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[PATCH] powerpc: allow cross-compilation of ppc64 kernel Laurent Vivier <laurent@vivier.eu> - 2015-11-05 12:50 +0100
  Re: [PATCH] powerpc: allow cross-compilation of ppc64 kernel Scott Wood <scottwood@freescale.com> - 2015-11-06 22:20 +0100
    Re: [PATCH] powerpc: allow cross-compilation of ppc64 kernel Laurent Vivier <laurent@vivier.eu> - 2015-11-06 23:30 +0100
      Re: [PATCH] powerpc: allow cross-compilation of ppc64 kernel Scott Wood <scottwood@freescale.com> - 2015-11-07 00:30 +0100
        Re: [PATCH] powerpc: allow cross-compilation of ppc64 kernel Laurent Vivier <laurent@vivier.eu> - 2015-11-07 12:40 +0100
          Re: [PATCH] powerpc: allow cross-compilation of ppc64 kernel Michael Ellerman <mpe@ellerman.id.au> - 2015-11-10 01:30 +0100
            Re: [PATCH] powerpc: allow cross-compilation of ppc64 kernel Laurent Vivier <laurent@vivier.eu> - 2015-11-10 09:00 +0100
    Re: [PATCH] powerpc: allow cross-compilation of ppc64 kernel Segher Boessenkool <segher@kernel.crashing.org> - 2015-11-07 00:00 +0100
      Re: [PATCH] powerpc: allow cross-compilation of ppc64 kernel Segher Boessenkool <segher@kernel.crashing.org> - 2015-11-07 00:40 +0100
        Re: [PATCH] powerpc: allow cross-compilation of ppc64 kernel Laurent Vivier <laurent@vivier.eu> - 2015-11-07 12:40 +0100
    Re: [PATCH] powerpc: allow cross-compilation of ppc64 kernel Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2015-11-07 00:20 +0100
      Re: [PATCH] powerpc: allow cross-compilation of ppc64 kernel Laurent Vivier <laurent@vivier.eu> - 2015-11-07 12:40 +0100

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