set(CMAKE_C_COMPILER clang-12)
set(CMAKE_CXX_COMPILER clang++-12)
set(CMAKE_EXE_LINKER_FLAGS -fuse-ld=lld)
set(CMAKE_SHARED_LINKER_FLAGS -fuse-ld=lld)
set(ENV{CC} clang-12)
set(ENV{CXX} clang++-12)