[Users] Status of support for multiple floating point precisions in Carpet?

[Erik Keoni Wessel]

Hi,
I'm currently working on a thorn development project where it would be
helpful to be able to have a mix of single-precision grid functions and
double-precision grid functions (a very unusual need, I know).

When I had my thorn allocate a grid function of type CCTK_REAL4, I got a
message upon running my configurations that I needed to enable support for
this type in Carpet. After reading through the Carpet documentation and
then digging deep into the source code for CarpetLib, I discovered that
there seem to be flags to compile Carpet with support for different types.
I passed -DCARPET_ALL_REAL in as part of CPPFLAGS in my optionlist, but
attempting to compile with other real types leads to compile-time errors
about undefined functions: apparently headers for prolongation functions
for all the types are generated, but somehow the corresponding definitions
aren't being be linked correctly.

I'm not sure what is going wrong, but I am also unable to find any examples
of how support for other types is supposed to be enabled, so I am unsure if
I am doing this right.

So my question is: what is the status of support for grid functions of
types besides CCTK_REAL8 in Carpet? Does this feature work, and if so, how
can I enable support for all Cactus-supported real types in Carpet?

Cheers,

— Erik Wessel
Department of Physics
University of Arizona
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