kiranchandramohan wrote: > x86_64 The macros are added in the following location. https://github.com/llvm/llvm-project/blob/dd04e183045f9fb2fb2322df4d623b60c0942850/flang/lib/Frontend/CompilerInvocation.cpp#L1291 https://github.com/llvm/llvm-project/pull/73911