[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 kobayos@…):

 I am building gcc-6.1.0 by using tools that are installed by MacPorts on
 El Capitan 10.11.5 and experienced the same problems.

 I could avoid this problem by reverting ld64-latest to 253.9_0+llvm37 and
 cctools to 877.8_0+llvm37.

 If only ld64-latest is reverted to 253.9_0+llvm37, the problem was not
 solved.

 I am wondering that this problem is caused by the latest cctools although
 I have not checked a case in which only cctools is reverted.

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Ticket URL: <https://trac.macports.org/ticket/51789#comment:11>
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