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

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

--- Comment #20 from Gerald Pfeifer <gerald at FreeBSD.org> ---
Alternately, should we just drop the USE_GCC=5 clause?

Are there relevant (for powerpc64 users) versions of FreeBSD where
this is really still necessary?


The other part is

  # Work-around for bug in tree-vect-loop.c
  CFLAGS+=      -mno-altivec

which is not quite sufficient to describe/document the actual issue.
Is there an (upstream?) bug report to refer to?  What and where is
that bug?

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