[MacPorts] #54510: clang fails to build; unexpected token: !tapi-tbd-v2

[MacPorts]

#54510: clang fails to build; unexpected token: !tapi-tbd-v2
---------------------------+-------------------------
 Reporter:  josephwinston  |      Owner:
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:
 Keywords:                 |       Port:  xorg-server
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 On OS X 10.12.6 (16G29), I have an outdated xorg-server (1.18.4_1 <
 1.18.4_2).  During the build of clang-3.7, now a required dependency of
 the xorg-server, I receive the following error message during linking:

 :info:build ld: unexpected token: !tapi-tbd-v2 file
 '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/usr/lib/libc++abi.tbd'
 for architecture x86_64
 :info:build clang: error: linker command failed with exit code 1 (use -v
 to see invocation)

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Ticket URL: <https://trac.macports.org/ticket/54510>
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