Messages in this thread | | | Subject | Re: [PATCH] powerpc: allow cross-compilation of ppc64 kernel | From | Laurent Vivier <> | Date | Tue, 10 Nov 2015 08:54:15 +0100 |
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Le 10/11/2015 01:29, Michael Ellerman a écrit : > On Sat, 2015-11-07 at 12:35 +0100, Laurent Vivier wrote: >> Le 07/11/2015 00:24, Scott Wood a écrit : >>> On Fri, 2015-11-06 at 23:22 +0100, Laurent Vivier wrote: >>>> Le 06/11/2015 22:09, Scott Wood a écrit : >>>>> 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. >>> >>>> So at this point, I can: >>>> >>>> 1- either fix my compiler, >>>> 2- or fix the vdso64 linker command. >>> >> Thank you Scott. With the help of the comment from Segher, I can choose >> #1 now :) > > What distro/toolchain did you hit this on?
fedora 23.
> I actually wrote this same patch a while back, but from memory it broke in some > configurations. So I never merged it. I'll see if I can find my notes and work > out exactly why it didn't work, maybe we should merge it anyway, even though > the real bug is a toolchain bug.
On fedora, there is also a bug in binutils configuration where ld is not able to manage ppc64le binaries on ppc64 host, but I've already sent a fix for that and it is now in rawhide (will be in fedora 24).
https://bugzilla.redhat.com/show_bug.cgi?id=1275709
Laurent
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