[MacPorts] #54215: gcc7, libgcc: broken on powerpc

[MacPorts]

#54215: gcc7, libgcc: broken on powerpc
---------------------------+----------------------
  Reporter:  mojca         |      Owner:  kencu
      Type:  defect        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:  fixed         |   Keywords:  haspatch
      Port:  gcc7, libgcc  |
---------------------------+----------------------

Comment (by ccorn):

 I have now analyzed the effects of the four patches proposed with
 {{{patch-darwin-ppc-2017-01-msg02971.diff}}}.

 * Patch 1/4 copies stack alignment changes previously applied to
 {{{aix.h}}}.
   This seems to cause 15 additional testsuite failures
   involving {{{gcc/testsuite/gcc.dg/builtin-apply4.c}}} and
   {{{gcc/testsuite/gcc.dg/torture/stackalign/builtin-apply-4.c}}}.
   The failures are related to the builtins around
   [https://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html
 {{{__builtin_apply}}}]
   as defined in {{{gcc/builtins.c}}}.
   I'd leave that patch out.
 * Patch 2/4 turns out to be necessary and sufficient for the non-Ada
   build to succeed. If you want a minimal patchset, stick to that one.
 * Patch 3/4 seems reasonable (marking {{{longjmp noreturn}}}),
   but does not contribute changes to the test summary.
 * Patch 4/4 looks reasonable (selecting Darwin thread headers),
   but is Ada-related, thus irrelevant here.

 Attaching the {{{gcc7}}} testsuite log diff showing the removal of
 alignment test failures when only patch 2 is used.

 Therefore, I recommend to remove patch 1 and keep patch 2.
 Patch 3 and patch 4 can be left to upstream judgement.

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Ticket URL: <https://trac.macports.org/ticket/54215#comment:45>
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