[Bug 215947] head -r311147 (e.g.) for powerpc/powerpc64: gcc 4.2.1 requires -mlongcall but clang does not need it (and various versions do not have it)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215947

--- Comment #6 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Mark Millard from comment #5)

I should have noted that the comment:

# XXX: See the log for r232932 as to why the above -mlongcall is needed.  Since
# clang doesn't support -mlongcall, and testing shows a clang linked with a
# clang-built csu segfaults, this must currently be compiled with gcc.  Once
# clang supports -mlongcall, or we get a fixed ld, this can be revisited.

would be out of date with the Makefile changes, at least
relative to clang for 3.9.1 (and even 3.8.0).

My understanding is that fairly modern clang is
"medium model" based (32 bit offsets instead
of 16, using two instructions instead of
one instruction: The first instruction
sets a register to within where a 16 bit
offset from its value then works for the
overall result).

longcall would then be for when more than 32 bit offsets
could be needed. If I understand right.

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