[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 #2 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Justin Hibbits from comment #1)

I have submitted llvm 31590 for the UnwindRegisters*.S related
syntax error reports. (Not covering libunwind.cpp's static assert
failure.)

While I placed it against llvm's/clang's powerpc support
initially my guess is they may reclassify it as against
libunwind's source.

(I did not find where to classify something as a libunwind
issue and I also took the point of view that their compiler
infrastructure was supposed to be able to parse their
project's source code.)

Of course they might end up declaring that
llvm/projects/libunwind/ is intentionally darwin-specific for
powerpc64 and powerpc and so only is expected to compile
for a darwin target relative to what they support. (I've
no clue of their policy/intent for such.)

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