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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()
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