[Bug 207175] projects/clang380-import for TARGET_ARCH=powerpc : clang 3.8.0 sometimes mishandles va_list overflow_arg_area vs. reg_save_area

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207175

--- Comment #4 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Mark Millard from comment #3)

I have tested compiling and running va_test.c under the system compiler for:

# uname -apKU
FreeBSD FBSDG4S 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r308247M: Thu Nov  3
11:39:11 PDT 2016    
markmi at FreeBSDx64:/usr/obj/powerpcvtsc_clang_gcc421_kernel/powerpc.powerpc/usr/src/sys/GENERICvtsc-NODBG
 powerpc powerpc 1200014 1200014

which is still clang 3.8.0 based (like stable/11 and release/11.0).

It does not get the reported SEGV and completes normally.

But this is from my environment for working around other clang problems when it
targets powerpc.

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