[CMake] No FortranCInterface mangling known for VerifyFortran -- OSX Sierra

[Burlen Loring]

After upgrading to latest XCode and command line tools on OSX Sierra our 
project that uses CMake to mix C++ and Fortran fails to configure. Full 
output below. Any ideas?

here are version

    cmake version 3.7.1
    GNU Fortran (Homebrew GCC 7.1.0) 7.1.0
    Apple LLVM version 8.1.0 (clang-802.0.42)

and full cmake output

    -- Detecting Fortran/C Interface
    -- Detecting Fortran/C Interface - Failed to compile
    -- Verifying Fortran/C Compiler Compatibility
    CMake Warning (dev) at
    /usr/local/Cellar/cmake/3.7.1/share/cmake/Modules/FortranCInterface.cmake:309
    (message):
       No FortranCInterface mangling known for VerifyFortran
    Call Stack (most recent call first):
    /usr/local/Cellar/cmake/3.7.1/share/cmake/Modules/FortranCInterface/Verify/CMakeLists.txt:16
    (FortranCInterface_HEADER)
    This warning is for project developers.  Use -Wno-dev to suppress it.

    -- Verifying Fortran/C Compiler Compatibility - Failed
    CMake Error at
    /usr/local/Cellar/cmake/3.7.1/share/cmake/Modules/FortranCInterface.cmake:382
    (message):
       The Fortran compiler:

         /usr/local/bin/gfortran

       and the C compiler:

         /usr/bin/clang

       failed to compile a simple test project using both languages. 
    The output
       was:

         Change Dir:
    /Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC

         Run Build Command:"/usr/bin/make"
         /usr/local/Cellar/cmake/3.7.1/bin/cmake
    -H/usr/local/Cellar/cmake/3.7.1/share/cmake/Modules/FortranCInterface/Verify
    -B/Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC
    --check-build-system CMakeFiles/Makefile.cmake 0
         /usr/local/Cellar/cmake/3.7.1/bin/cmake -E cmake_progress_start
    /Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC/CMakeFiles
    /Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC/CMakeFiles/progress.marks
         /Library/Developer/CommandLineTools/usr/bin/make -f
    CMakeFiles/Makefile2 all
         /Library/Developer/CommandLineTools/usr/bin/make -f
    CMakeFiles/VerifyFortran.dir/build.make
    CMakeFiles/VerifyFortran.dir/depend
         cd
    /Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC &&
    /usr/local/Cellar/cmake/3.7.1/bin/cmake -E cmake_depends "Unix
    Makefiles"
    /usr/local/Cellar/cmake/3.7.1/share/cmake/Modules/FortranCInterface/Verify
    /usr/local/Cellar/cmake/3.7.1/share/cmake/Modules/FortranCInterface/Verify
    /Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC
    /Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC
    /Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC/CMakeFiles/VerifyFortran.dir/DependInfo.cmake
         Scanning dependencies of target VerifyFortran
         /Library/Developer/CommandLineTools/usr/bin/make -f
    CMakeFiles/VerifyFortran.dir/build.make
    CMakeFiles/VerifyFortran.dir/requires
         make[2]: Nothing to be done for
    `CMakeFiles/VerifyFortran.dir/requires'.
         /Library/Developer/CommandLineTools/usr/bin/make -f
    CMakeFiles/VerifyFortran.dir/build.make
    CMakeFiles/VerifyFortran.dir/build
         [ 20%] Building Fortran object
    CMakeFiles/VerifyFortran.dir/VerifyFortran.f.o
         /usr/local/bin/gfortran
    -I/Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC
    -Wall -Wextra -Wno-conversion -O3 -DNDEBUG -O3   -c
    /usr/local/Cellar/cmake/3.7.1/share/cmake/Modules/FortranCInterface/Verify/VerifyFortran.f
    -o CMakeFiles/VerifyFortran.dir/VerifyFortran.f.o
         [ 40%] Linking Fortran static library libVerifyFortran.a
         /usr/local/Cellar/cmake/3.7.1/bin/cmake -P
    CMakeFiles/VerifyFortran.dir/cmake_clean_target.cmake
         /usr/local/Cellar/cmake/3.7.1/bin/cmake -E cmake_link_script
    CMakeFiles/VerifyFortran.dir/link.txt --verbose=1
         /usr/bin/ar qc libVerifyFortran.a
    CMakeFiles/VerifyFortran.dir/VerifyFortran.f.o
         /usr/bin/ranlib libVerifyFortran.a
         [ 40%] Built target VerifyFortran
         /Library/Developer/CommandLineTools/usr/bin/make -f
    CMakeFiles/VerifyFortranC.dir/build.make
    CMakeFiles/VerifyFortranC.dir/depend
         cd
    /Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC &&
    /usr/local/Cellar/cmake/3.7.1/bin/cmake -E cmake_depends "Unix
    Makefiles"
    /usr/local/Cellar/cmake/3.7.1/share/cmake/Modules/FortranCInterface/Verify
    /usr/local/Cellar/cmake/3.7.1/share/cmake/Modules/FortranCInterface/Verify
    /Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC
    /Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC
    /Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC/CMakeFiles/VerifyFortranC.dir/DependInfo.cmake
         Scanning dependencies of target VerifyFortranC
         /Library/Developer/CommandLineTools/usr/bin/make -f
    CMakeFiles/VerifyFortranC.dir/build.make
    CMakeFiles/VerifyFortranC.dir/build
         [ 60%] Building C object CMakeFiles/VerifyFortranC.dir/main.c.o
         /usr/bin/clang
    -I/Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC -O3
    -DNDEBUG   -o CMakeFiles/VerifyFortranC.dir/main.c.o   -c
    /usr/local/Cellar/cmake/3.7.1/share/cmake/Modules/FortranCInterface/Verify/main.c
         [ 80%] Building C object CMakeFiles/VerifyFortranC.dir/VerifyC.c.o
         /usr/bin/clang
    -I/Users/bloring/TECA/build/CMakeFiles/FortranCInterface/VerifyC -O3
    -DNDEBUG   -o CMakeFiles/VerifyFortranC.dir/VerifyC.c.o   -c
    /usr/local/Cellar/cmake/3.7.1/share/cmake/Modules/FortranCInterface/Verify/VerifyC.c
         [100%] Linking C executable VerifyFortranC
         /usr/local/Cellar/cmake/3.7.1/bin/cmake -E cmake_link_script
    CMakeFiles/VerifyFortranC.dir/link.txt --verbose=1
         /usr/bin/clang  -O3 -DNDEBUG -Wl,-search_paths_first
    -Wl,-headerpad_max_install_names
    CMakeFiles/VerifyFortranC.dir/main.c.o
    CMakeFiles/VerifyFortranC.dir/VerifyC.c.o  -o VerifyFortranC
    -L/usr/local/Cellar/gcc/7.1.0/lib/gcc/7/gcc/x86_64-apple-darwin16.5.0/7.1.0
    -L/usr/local/Cellar/gcc/7.1.0/lib/gcc/7 libVerifyFortran.a
    -lgfortran -lquadmath -lm
         Undefined symbols for architecture x86_64:
           "_VerifyFortran", referenced from:
               _main in main.c.o
         ld: symbol(s) not found for architecture x86_64
         clang: error: linker command failed with exit code 1 (use -v to
    see invocation)
         make[2]: *** [VerifyFortranC] Error 1
         make[1]: *** [CMakeFiles/VerifyFortranC.dir/all] Error 2
         make: *** [all] Error 2

    Call Stack (most recent call first):
       alg/CMakeLists.txt:74 (FortranCInterface_VERIFY)

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