[MacPorts] #57198: libgcc8: build fails when libunwind-headers is installed

[MacPorts]

#57198: libgcc8: build fails when libunwind-headers is installed
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  Reporter:  miken32  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.5.3
Resolution:           |   Keywords:
      Port:  libgcc8  |
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Comment (by cooljeanius):

 This is gcc upstream's bug 78251:
 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78251

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Ticket URL: <https://trac.macports.org/ticket/57198#comment:19>
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