We already do this for nouveau, but it's required for clover too.
if dep_llvm.get_configtool_variable('has-rtti') == 'NO'
if with_gallium_nouveau
error('The Nouveau driver requires rtti. You either need to turn off nouveau or use an LLVM built with LLVM_ENABLE_RTTI.')
+ elif with_gallium_opencl
+ error('The Clover OpenCL state tracker requires rtti, you need to turn off clover or use an LLVM built with LLVM_ENABLE_RTTI.')
endif
cpp_args += '-fno-rtti'
endif