Re: [PATCH] powerpc/Makefiles: Fix clang/llvm build

Anton Blanchard [off-list ref] writes:

From: Anton Blanchard <redacted>

Commit 15a3204d24a3 ("powerpc/64s: Set assembler machine type to POWER4")
passes -mpower4 to the assembler. We have more recent instructions in our
assembly files, but gas permits them. The clang/llvm integrated assembler
is more strict, and we get a build failure.

Fix this by calling the assembler with -mcpu=power8

This breaks GCC 4.6.3 at least, which we still support:

  Assembler messages:
  Error: invalid switch -mpower8
  Error: unrecognized option -mpower8
  ../scripts/mod/empty.c:1:0: fatal error: error closing -: Broken pipe


cheers