mold error building vcpkg

[ninetailedtori]

CMake Error at /usr/share/cmake/Modules/CMakeTestCCompiler.cmake:67 (message):
  The C compiler

    "/bin/clang"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: 'src/Millennium/vendor/vcpkg/buildtrees/detect_compiler/x86-linux-rel/CMakeFiles/CMakeScratch/TryCompile-TF3n0o'
    
    Run Build Command(s): /bin/ninja -v cmTC_3b47a
    [1/2] /bin/clang   -march=znver3 -mtune=znver3 -O3 -pipe -fstack-protector-strong --param=ssp-buffer-size=4 -fno-plt -fopenmp -fopenmp-extensions -pthread -fexceptions -Wp,-D_FORTIFY_SOURCE=3 -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -Wformat -Werror=format-security -flto  -fPIC  -m32 -MD -MT CMakeFiles/cmTC_3b47a.dir/testCCompiler.c.o -MF CMakeFiles/cmTC_3b47a.dir/testCCompiler.c.o.d -o CMakeFiles/cmTC_3b47a.dir/testCCompiler.c.o -c /tmp/makepkg/millennium-git/src/Millennium/vendor/vcpkg/buildtrees/detect_compiler/x86-linux-rel/CMakeFiles/CMakeScratch/TryCompile-TF3n0o/testCCompiler.c
    [2/2] : && /bin/clang -march=znver3 -mtune=znver3 -O3 -pipe -fstack-protector-strong --param=ssp-buffer-size=4 -fno-plt -fopenmp -fopenmp-extensions -pthread -fexceptions -Wp,-D_FORTIFY_SOURCE=3 -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -Wformat -Werror=format-security -flto  -fPIC  -m32 -m32 -fuse-ld=mold -Wl,-O4,--sort-common,--as-needed,-z,relro,-z,now,-z,pack-relative-relocs,-lgomp,-lpthread -flto CMakeFiles/cmTC_3b47a.dir/testCCompiler.c.o -o cmTC_3b47a   && :
    FAILED: [code=1] cmTC_3b47a 
    : && /bin/clang -march=znver3 -mtune=znver3 -O3 -pipe -fstack-protector-strong --param=ssp-buffer-size=4 -fno-plt -fopenmp -fopenmp-extensions -pthread -fexceptions -Wp,-D_FORTIFY_SOURCE=3 -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -Wformat -Werror=format-security -flto  -fPIC  -m32 -m32 -fuse-ld=mold -Wl,-O4,--sort-common,--as-needed,-z,relro,-z,now,-z,pack-relative-relocs,-lgomp,-lpthread -flto CMakeFiles/cmTC_3b47a.dir/testCCompiler.c.o -o cmTC_3b47a   && :
    mold: warning: /lib/libomp.so: skipping incompatible file: x86_64 (e_machine 3)
    mold: warning: /usr/lib/libomp.so: skipping incompatible file: x86_64 (e_machine 3)
    mold: warning: /usr/lib/libomp.so: skipping incompatible file: x86_64 (e_machine 3)
    mold: fatal: library not found: omp
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    ninja: build stopped: subcommand failed.
    
    



  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:11 (enable_language)

I've never had this warning on anything other than vcpkg, like, all other projects compile fine with openmp and extensions through clang and lgomp on mold's end enabled. Not sure if I'm doing something wrong?

[ninetailedtori]

Narrowed down the bug, can confirm that it's just vcpkg, and it's only with fopenmp enabled. When disabled, the project succeeds toolchain and completes the compilation flawlessly. I'm not too sure it's mold's problem at this point, but I wasn't truly sure what "e_machine 3" actually refers to lmao.