[MacPorts] #53565: cmake: Fortran build error with MACOSX_DEPLOYMENT_TARGET set

[MacPorts]

#53565: cmake: Fortran build error with MACOSX_DEPLOYMENT_TARGET set
----------------------+------------------------
 Reporter:  tenomoto  |      Owner:  michaelld
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  cmake, gcc
----------------------+------------------------
 When MACOSX_DEPLOYMENT_TARGET is set, gfortran fails to build a simple
 test program during cmake. The attachment is a minimal CMakeLists.txt to
 reproduce the problem. I used gfrotran-mp-6 on Sierra, but I also had the
 same problem with gfortran-mp-5.

 {{{
 $ tail CMakeFiles/CMakeError.log
 /opt/local/bin/gfortran-mp-6    -isysroot
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk
 -mmacosx-version-min=10.11   -c
 /tmp/cmake/build/CMakeFiles/CMakeTmp/testFortranCompiler.f -o
 CMakeFiles/cmTC_7967f.dir/testFortranCompiler.f.o
 Linking Fortran executable cmTC_7967f
 /opt/local/bin/cmake -E cmake_link_script
 CMakeFiles/cmTC_7967f.dir/link.txt --verbose=1
 /opt/local/bin/gfortran-mp-6       -isysroot
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk
 -mmacosx-version-min=10.11
 CMakeFiles/cmTC_7967f.dir/testFortranCompiler.f.o  -o cmTC_7967f
 ld: unexpected token: !tapi-tbd-v2 file
 '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/usr/lib/libSystem.tbd'
 for architecture x86_64
 collect2: error: ld returned 1 exit status
 make[1]: *** [cmTC_7967f] Error 1
 make: *** [cmTC_7967f/fast] Error 2
 }}}

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Ticket URL: <https://trac.macports.org/ticket/53565>
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