[Bug 215039] head -r309179 TARGET_ARCH=powerpc64 clang 3.9.0 based buildworld on powerpc64 using WITH_LLVM_LIBUNWIND= fails to build: asserts and rejects .S file contents

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215039

--- Comment #3 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
Note: I recently posted to a list that the problems
still exist as of head -r339076 . This was in reply
to a suggestion to try it.

But the particular experiment was adding WITH_LLVM_LIBUNWIND=
to a src.conf type of file for using devel/powerpc64-gcc to
do the build (on a powerpc64). [clang is still not up to
it.]

For example, UnwindRegistersRestore.S did not get the C-preprocessor
handling that it is designed for and the __ppc__ assembler notation
still has "register designations are a Darwinism" status. The ";"
comment notation also might be a Darwinism as far as I know.

WITH_LLVM_LIBUNWIND= is not yet an option for powerpc64 and the like.

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