[MacPorts] #51789: gcc5 @5.4.0_0: ld: warning: could not create compact unwind for __Unwind_RaiseException: non-standard register 0 being saved in prolog

[MacPorts]

#51789: gcc5 @5.4.0_0: ld: warning: could not create compact unwind for
__Unwind_RaiseException: non-standard register 0 being saved in prolog
------------------------------+-------------------
  Reporter:  davide.liessi@…  |      Owner:  mww@…
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:
      Port:  libgcc, gcc5     |
------------------------------+-------------------

Comment (by dali43@…):

 After the latest `selfupdate` and `upgrade outdated` yesterday morning, I
 was able to build `gcc5 @5.4.0_0` successfully.

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Ticket URL: <https://trac.macports.org/ticket/51789#comment:14>
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