[mpich-discuss] Extensible Clang type annotation

[Dave Goodell]

[adding Hal Finkel and Dmitri Gribenko, who did most of the annotations work]

Hal/Dmitri,

Do you have any ideas about how to handle Jed's case?  Will the MPICH_ATTR_TYPE_TAG_LAYOUT_COMPATIBLE macro (reproduced below) help in this case?

----8<----
#    define MPICH_ATTR_TYPE_TAG_LAYOUT_COMPATIBLE(type)             __attribute__((type_tag_for_datatype(MPI,type,layout_compatible)))
----8<----

-Dave

On Dec 30, 2012, at 11:13 PM CST, Jed Brown wrote:

> 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?
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