Hi Sorry ...I know I should be mailing to the clang list but I am waiting for my subscription. My question is on how to name my builtin in source if i have a intrinsic definition like def int_mytarget_get_id : : Intrinsic<[llvm_i32_ty], [llvm_i32_ty]>; I tried __builtin_mytarget_get_id and clang still didnt generate my intrinsic. thanks shrey