[MacPorts] #51245: libgcc-devel @6-20160421_0 build fails on OS X 10.10.5

[MacPorts]

#51245: libgcc-devel @6-20160421_0 build fails on OS X 10.10.5
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  Reporter:  mopihopi@…            |      Owner:  mww@…
      Type:  defect                |     Status:  new
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.3.4
Resolution:                        |   Keywords:
      Port:  libgcc, libgcc-devel  |
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Comment (by ryandesign@…):

 It built successfully for me on my El Capitan system before committing. I
 have Xcode 7.3 on my system. I think the El Capitan buildbot is still
 running Xcode 7.1 and the Yosemite buildbot is still running Xcode 6.4 so
 maybe this is something Apple fixed in later clang versions.

 Thanks for the reference to the Homebrew issue. I will first have to see
 if I can reproduce the problem locally by downgrading my Xcode, then see
 if any of the suggested fixes work for us.

 #45174 is not related; that was a PowerPC-specific bug in ld64. We have
 had many tickets over the years about "Bootstrap comparison failure" when
 building gcc, which are not all caused by the same issue.

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Ticket URL: <https://trac.macports.org/ticket/51245#comment:10>
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