[Bug 225629] powerpc64 (POWER9) segfaults randomly (e.g., building lang/gcc5)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225629

--- Comment #21 from Kenneth Salerno <kennethsalerno at yahoo.com> ---
(In reply to Gerald Pfeifer from comment #20)
Hi, Gerald. You still need to use lang/gcc5 to build lang/gcc6 on Power if you
are using the default /usr/bin/cc -> GCC 4.2.1 as the system compiler because
you need >= 4.9 to build version 5.

USE_GCC=5 is only unnecessary/harmful when you used an external compiler to
build world that is C++11 capable and therefore builds /usr/bin/cc ->
LLVM/Clang as the system compiler which is not capable of building lang/gcc5 as
this bug states (see /usr/src/share/mk/src.opts.mk:489-498).

As for tree-vect-loop.c, Mark is the expert on that one:
https://lists.freebsd.org/pipermail/freebsd-toolchain/2017-October/003328.html

My patch is just a work-around.

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