[MacPorts] #58776: macOS 10.15 libgcc9 fails to build with Xcode 11

[MacPorts]

#58776: macOS 10.15 libgcc9 fails to build with Xcode 11
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  Reporter:  vdoublie  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  catalina
      Port:  libgcc9   |
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Comment (by saagarjha):

 I can confirm that gcc builds if I force gmp to build with -fno-stack-
 check, using Xcode Version 11.2 (11B41) on macOS Catalina 10.15.1
 (19B68f). (As a side note, it seems like Xcode 11.2 does ''not'' fix the
 stack alignment issue for gmp, at least not yet. Perhaps the check we have
 on whether to apply the workaround is a bit too optimistic?)

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Ticket URL: <https://trac.macports.org/ticket/58776#comment:20>
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