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[Matthias Klose <doko@xxxxxxxxxx>]

arch/powerpc/Makefile has:

HAS_BIARCH      := $(call cc-option-yn, -m32)

but in vivid:

$ gcc-4.8 -m32 -c foo.c 
foo.c:1:0: error: -m32 not supported in this configuration
$ gcc-4.9 -m32 -c foo.c 
foo.c:1:0: error: -m32 not supported in this configuration
$ gcc-5 -m32 -c foo.c 
foo.c:1:0: error: -m32 not supported in this configuration

and the vdso32 stuff seems to be built unconditionally.

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https://bugs.launchpad.net/bugs/1433809

Title:
  linux build failure seen building 32bit user space support on ppc64el

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Trusty:
  Confirmed

Bug description:
  linux build failure seen building 32bit user space support on ppc64el, using the toolchain from ubuntu-toolchain-r/ppa on trusty. complete build log at
  https://launchpad.net/ubuntu/+archive/test-rebuild-20150317-security/+build/7070318

    VDSO32A arch/powerpc/kernel/vdso32/gettimeofday.o
  /build/buildd/linux-3.13.0/arch/powerpc/kernel/vdso32/gettimeofday.S: Assembler messages:
  /build/buildd/linux-3.13.0/arch/powerpc/kernel/vdso32/gettimeofday.S:42: Error: syntax error; found `@', expected `,'
  /build/buildd/linux-3.13.0/arch/powerpc/kernel/vdso32/gettimeofday.S:42: Error: junk at end of line: `@local'
  /build/buildd/linux-3.13.0/arch/powerpc/kernel/vdso32/gettimeofday.S:48: Error: syntax error; found `@', expected `,'
  /build/buildd/linux-3.13.0/arch/powerpc/kernel/vdso32/gettimeofday.S:48: Error: junk at end of line: `@local'
  /build/buildd/linux-3.13.0/arch/powerpc/kernel/vdso32/gettimeofday.S:83: Error: syntax error; found `@', expected `,'
  /build/buildd/linux-3.13.0/arch/powerpc/kernel/vdso32/gettimeofday.S:83: Error: junk at end of line: `@local'
  /build/buildd/linux-3.13.0/arch/powerpc/kernel/vdso32/gettimeofday.S:87: Error: syntax error; found `@', expected `,'
  /build/buildd/linux-3.13.0/arch/powerpc/kernel/vdso32/gettimeofday.S:87: Error: junk at end of line: `@local'
  /build/buildd/linux-3.13.0/arch/powerpc/kernel/vdso32/gettimeofday.S:195: Error: syntax error; found `@', expected `,'
  /build/buildd/linux-3.13.0/arch/powerpc/kernel/vdso32/gettimeofday.S:195: Error: junk at end of line: `@local'
  make[4]: *** [arch/powerpc/kernel/vdso32/gettimeofday.o] Error 1
  make[3]: *** [arch/powerpc/kernel/vdso32] Error 2
  make[3]: *** Waiting for unfinished jobs....

  yeah, thanks for non-verbose build logs !!!

  doing it the hard way, you see that this file was (and wants to be)
  compiled with -m32, and I assume with gcc finally dropping the
  multilib configurations for ppc64el, the kernel configury decides that
  it can do without -m32.

  but why in the first place is this needed? there is no powerpcle user
  space.

  I assume this issue is latent in all releases.

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