[MacPorts] #47996: libgcc @5.1.0_1: build fails with clang from Xcode 4.0.1 (out-of-line definition of '...' does not match any declaration in '...')

[MacPorts]

#47996: libgcc @5.1.0_1: build fails with clang from Xcode 4.0.1 (out-of-line
definition of '...' does not match any declaration in '...')
---------------------------+-------------------
  Reporter:  ryandesign@…  |      Owner:  mww@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.3.3
Resolution:                |   Keywords:
      Port:  gcc5          |
---------------------------+-------------------

Comment (by ryandesign@…):

 Forcing the use of clang from Xcode 3.2.6, configure fails with:

 {{{
 cc1plus: error: unrecognized command line option "-Wno-narrowing"
 }}}

 Also, I confirmed the issue with Xcode 4.2 with libgcc @5.1.0 and libgcc-
 devel @20150531.

 Now building libgcc with macports-clang-3.4. Will then check gcc6, gcc5,
 gcc49.

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Ticket URL: <https://trac.macports.org/ticket/47996#comment:1>
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