https://sourceware.org/bugzilla/show_bug.cgi?id=19359

--- Comment #8 from Peter Bergner <bergner at vnet dot ibm.com> ---
(In reply to Alan Modra from comment #6)
> Peter, I haven't investigated why gcc is misbehaving and I'm supposed to be
> on vacation.  It is almost certainly an error in rs6000.h:ASM_CPU_SPEC.

Yes, it was a missing option in ASM_CPU_SPEC.  Patch submitted upstream.
I'll note that -mcpu=powerpc64le was already correctly setting the internal
TARGET_* flags in gcc to make it mimic -mcpu=power8.  The only missing part was
the ASM_CPU_SPEC part to get the correct assembler option passed down.  FYI,
the GCC patch is located here:

  https://gcc.gnu.org/ml/gcc-patches/2015-12/msg02054.html

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