llvm-11 fails for invalid version number in '-mlinker-version=2.2.'

[rmottola (Riccardo)]

out of the box on High Sierra 10.15 build fails

-- Check for working C compiler: /opt/local/bin/clang-mp-9.0 - broken
CMake Error at /opt/local/share/cmake-3.31/Modules/CMakeTestCCompiler.cmake:67 (message):
  The C compiler

    "/opt/local/bin/clang-mp-9.0"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: '/opt/local/var/macports/build/llvm-11-2adc989d/work/build/CMakeFiles/CMakeScratch/TryCompile-qgvrp3'
    
    Run Build Command(s): /opt/local/bin/cmake -E env VERBOSE=1 /usr/bin/make -f Makefile cmTC_094a4/fast
    /Library/Developer/CommandLineTools/usr/bin/make  -f CMakeFiles/cmTC_094a4.dir/build.make CMakeFiles/cmTC_094a4.dir/build
    Building C object CMakeFiles/cmTC_094a4.dir/testCCompiler.c.o
    /opt/local/bin/clang-mp-9.0   -pipe -Os  -arch x86_64 -mmacosx-version-min=10.13 -MD -MT CMakeFiles/cmTC_094a4.dir/testCCompiler.c.o -MF CMakeFiles/cmTC_094a4.dir/testCCompiler.c.o.d -o CMakeFiles/cmTC_094a4.dir/testCCompiler.c.o -c /opt/local/var/macports/build/llvm-11-2adc989d/work/build/CMakeFiles/CMakeScratch/TryCompile-qgvrp3/testCCompiler.c
    Linking C executable cmTC_094a4
    /opt/local/bin/cmake -E cmake_link_script CMakeFiles/cmTC_094a4.dir/link.txt --verbose=1
    clang: error: invalid version number in '-mlinker-version=2.2.'
    /opt/local/bin/clang-mp-9.0 -pipe -Os  -arch x86_64 -mmacosx-version-min=10.13 -Wl,-search_paths_first -Wl,-headerpad_max_install_names -L/opt/local/lib -Wl,-headerpad_max_install_names  CMakeFiles/cmTC_094a4.dir/testCCompiler.c.o -o cmTC_094a4

[jmroot (Joshua Root)]

#73601