[Bug 206990] powerpc (32-bit), projects/clang380-import vs. 11.0-CURRENT's sendsig: need to avoid signal delivery trashing the stack and so causing SIGSEGV

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206990

--- Comment #13 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Dimitry Andric from comment #10)

I got a notice of the latest fix for covering
the TARGET_ARCH=powerpc stack-handling issues
for llvm bugzilla 26519:

Comment # 33 on bug 26519 from Krzysztof Parzyszek
The fix has been committed in master in r303257.

I opened PR33070 to request merging it into 4.0.1.

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I've been using a version of the patch for some time
and for buildworld it appears that with it powerpc
and powerpc64 have a similar status: the one known
area not working is handling of thrown C++ exceptions
--for example the required dwarf information is
incomplete so such programs crash handling thrown
exceptions.

As for buildkernel use for powerpc (32-bit):

powerpc FreeBSD with a clang 4 based
kernel build on the same machines fails at
the /sbin/init attempt and then gets an
alignment exception. (I've not tried a G4
or G3 yet.) But booting the kernel seems
to work up to that point.

Both the buildworld and the buildkernel results
are great improvements for targeting 32-bit
powerpc FreeBSD via clang.

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