ld: dynamic main executables must link with libSystem.dylib for architecture x86_64

[pearu]

When running cmake:

-- Check for working C compiler: /Users/quansight/miniconda3/envs/omniscidb-cpu-dev2/bin/clang -- broken
CMake Error at /Users/quansight/miniconda3/envs/omniscidb-cpu-dev2/share/cmake-3.15/Modules/CMakeTestCCompiler.cmake:60 (message):
  The C compiler

    "/Users/quansight/miniconda3/envs/omniscidb-cpu-dev2/bin/clang"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: /Users/quansight/pearu/git/omniscidb/omniscidb-internal/build/CMakeFiles/CMakeTmp
    
    Run Build Command(s):/Users/quansight/miniconda3/envs/omniscidb-cpu-dev2/bin/make cmTC_61f65/fast && /Users/quansight/miniconda3/envs/omniscidb-cpu-dev2/bin/make -f CMakeFiles/cmTC_61f65.dir/build.make CMakeFiles/cmTC_61f65.dir/build
    make[1]: Entering directory '/Users/quansight/pearu/git/omniscidb/omniscidb-internal/build/CMakeFiles/CMakeTmp'
    Building C object CMakeFiles/cmTC_61f65.dir/testCCompiler.c.o
    /Users/quansight/miniconda3/envs/omniscidb-cpu-dev2/bin/clang   -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe  -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk -mmacosx-version-min=10.12   -o CMakeFiles/cmTC_61f65.dir/testCCompiler.c.o   -c /Users/quansight/pearu/git/omniscidb/omniscidb-internal/build/CMakeFiles/CMakeTmp/testCCompiler.c
    Linking C executable cmTC_61f65
    /Users/quansight/miniconda3/envs/omniscidb-cpu-dev2/bin/cmake -E cmake_link_script CMakeFiles/cmTC_61f65.dir/link.txt --verbose=1
    /Users/quansight/miniconda3/envs/omniscidb-cpu-dev2/bin/clang -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe  -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk -mmacosx-version-min=10.12 -Wl,-search_paths_first -Wl,-headerpad_max_install_names -L/Users/quansight/miniconda3/envs/omniscidb-cpu-dev2/lib -Wl,-rpath,/Users/quansight/miniconda3/envs/omniscidb-cpu-dev2/lib  CMakeFiles/cmTC_61f65.dir/testCCompiler.c.o  -o cmTC_61f65 
    ld: warning: ignoring file /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/lib/libSystem.tbd, file was built for unsupported file format ( 0x2D 0x2D 0x2D 0x20 0x21 0x74 0x61 0x70 0x69 0x2D 0x74 0x62 0x64 0x2D 0x76 0x33 ) which is not the architecture being linked (x86_64): /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/lib/libSystem.tbd
    ld: dynamic main executables must link with libSystem.dylib for architecture x86_64
    clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
    make[1]: *** [CMakeFiles/cmTC_61f65.dir/build.make:87: cmTC_61f65] Error 1
    make[1]: Leaving directory '/Users/quansight/pearu/git/omniscidb/omniscidb-internal/build/CMakeFiles/CMakeTmp'
    make: *** [Makefile:121: cmTC_61f65/fast] Error 2

Note that conda activate ... sets CONDA_BUILD_SYSROOT=/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk.

If you are using different SDK then the solution is:

export CONDA_BUILD_SYSROOT=/Users/quansight/MacOSX-SDKs/MacOSX10.12.sdk/

for instance (make sure you adjust the SDK path to your case).