[MacPorts] #49227: gcc5 @5.2.0: fix gcj

[MacPorts]

#49227: gcc5 @5.2.0: fix gcj
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  Reporter:  howarth.at.macports@…  |      Owner:  mww@…
      Type:  defect                 |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.3.4
Resolution:                         |   Keywords:  haspatch
      Port:  gcc5                   |
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Comment (by howarth.at.macports@…):

 IMHO, I would integrate the patch but only for builds on darwin15 or later
 since only that platform has the problematic rebuild of libunwind.dylib
 with the newer llvm optimization that exposes the latent bug in the older
 boehm-gc.

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Ticket URL: <https://trac.macports.org/ticket/49227#comment:26>
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