[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 #4 from Mark Millard <markmi at dsl-only.net> ---
Comment on attachment 178726
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=178726
avoid -mlongcall use for clang; use it for gcc

An alternate if it is supported for lib/csu/powerpc64/Makefile is use of:

CFLAGS+=        -I${.CURDIR}/../common \
                -I${.CURDIR}/../../libc/include

CFLAGS.gcc+= -mlongcall

without the conditional logic for compiler type.

Similarly for sys/conf/kmod.mk if supported there:

CFLAGS+=        -fno-omit-frame-pointer
CFLAGS.gcc+=    -mlongcall

again without the conditional logic for compiler type.

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