[mpich-discuss] Extensible Clang type annotation

I upgraded to clang-3.2 and the new type annotations are great. I'd like to have a identified for enum types, e.g. typedef enum {SOME, VALUES} MyEnum; #define MY_MPI_ENUM MPI_INT // or define some other way static const MPI_Datatype my_mpi_enum MPICH_ATTR_TYPE_TAG(MyEnum) = MY_MPI_ENUM; Of course the above does not work because the new definition masks the old one, so all the normal 'int' uses are hidden. Unfortunately, the annotation syntax requires compile-time constants, which are not accessible to me. Is there any hope for something like this, or do I have to choose between (a) ugly cast at all MPI call points and (b) make MY_MPI_ENUM a variable so that the compiler can't check it statically?