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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.

** Affects: linux (Ubuntu)
     Importance: High
         Status: Confirmed


** Tags: ftbfs
-- 
linux build failure seen building 32bit user space support on ppc64el
https://bugs.launchpad.net/bugs/1433809
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