| option(LLVM_ALLOW_PROBLEMATIC_CONFIGURATIONS OFF "Set this option to ON to allow problematic toolchain configurations. Use on your own risk.") | |
| macro(log_problematic MESSAGE) | |
| if(LLVM_ALLOW_PROBLEMATIC_CONFIGURATIONS) | |
| message(WARNING "${MESSAGE}") | |
| else() | |
| message(FATAL_ERROR "${MESSAGE}\nYou can force usage of this configuration by passing -DLLVM_ALLOW_PROBLEMATIC_CONFIGURATIONS=ON") | |
| endif() | |
| endmacro() | |
| # MSVC and /arch:AVX is untested and have created problems before. See: | |
| # https://github.com/llvm/llvm-project/issues/54645 | |
| if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") | |
| string(TOLOWER "${CMAKE_CXX_FLAGS} ${CMAKE_C_FLAGS}" _FLAGS) | |
| if(_FLAGS MATCHES "/arch:avx[0-9]*") | |
| log_problematic("Compiling LLVM with MSVC and the /arch:AVX flag is known to cause issues with parts of LLVM.\nSee https://github.com/llvm/llvm-project/issues/54645 for details.\nUse clang-cl if you want to enable AVX instructions.") | |
| endif() | |
| endif() |