[petsc-dev] Detecting MPI_C_DOUBLE_COMPLEX when clanguage!='C'

[Satish Balay]

On Mon, 23 Apr 2012, Barry Smith wrote:

> 
> On Apr 23, 2012, at 7:51 PM, Jed Brown wrote:
> 
> >     if self.getDefaultLanguage() == 'C': mpitypes.extend([('MPI_C_DOUBLE_COMPLEX', 'c-double-complex')])
> > 
> > Why don't we check for this regardless of C language? The C and C++ types are binary compatible and there is an advantage to using the predefined data types: it lets us also use the predefined MPI_Ops, which would let us use MPIU_SUM with PetscSF (and possibly use more optimized reduction implementations in other cases).
> 
> 
>   Though this may always work are they technically really binary compatible and does MPI (the standard) really support complex in C++ since it is not the same as complex in C?
> 
>    Yes this mostly academic bullshit and we should try to see if it works with C++ in BuildSystem also.

Well it didn't work on mpich/windows - and as per the following discussion - I made
that change.

http://trac.mcs.anl.gov/projects/mpich2/ticket/1525

Satish