[MacPorts] #54215: gcc7: broken on powerpc

[MacPorts]

#54215: gcc7: broken on powerpc
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  Reporter:  mojca   |      Owner:
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  haspatch
      Port:  gcc7    |
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Comment (by ccorn):

 Both {{{gcc7}}} and its subport {{{libgcc}}} get built successfully with
 the mentioned [https://gcc.gnu.org/bugzilla/attachment.cgi?id=42124 patch-
 darwin-ppc-2017-01-msg02971.diff]
 which comprises Iain Sandoe's Darwin/PPC patches.

 A tiny bit of ad-hoc testing reveals no more than the ages-old problem (at
 least on my apple-darwin9-powerpc G5) that C++ programs indirectly linked
 to both GCC's and the native C++ runtime libs tend to crash on exit. E.g.
 {{{octave-gui}}}. That can be avoided by using {{{-static-libgcc}}} when
 linking. There used to be an ancient patchfile for the GCC ports forcing
 that, but it was controversial and removed from the GCC 4.7+ ports if I
 recall correctly. I have kept the patch in a private git branch of the
 ports tree and applied it without problems ever since.
 (If you folks have no such problems, I'd like to hear about that.)

 I have now applied that force-static-libgcc patch to the GCC7 port. Both
 {{{libgcc}}} and {{{gcc7}}} still build fine; and {{{octave-gui}}} does
 not crash on exit any longer.
 Furthermore, my handful of C++11 feature tests works.
 The {{{boost}}} port (privately patched to allow GCC) also builds fine,
 and my few tests with {{{Boost.Threads}}} work. Superficially, things look
 nice.

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Ticket URL: <https://trac.macports.org/ticket/54215#comment:11>
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