[petsc-dev] --download-mpich --download-openmpi and mpicc

[Sean Farley]

>
> I don't think this was the problem. We call updateCompilers() after the
> install, so it should override anything the user puts in.
>

If I understand Barry correctly, it's that people who specify this:

$ ./configure CC=mpicc --CXX=mpicxx --download-mpich

clearly do not understand the --download-mpich option and should be told:

ERROR: User needs to learn MPI; either use the cluster's custom built mpi
XOR use --download-mpich

because if configure && make succeed, then they will irrevocably use the
mpiexec or mpicc in their $PATH and then use such great lines as "I have no
idea what MPI is!" or "I just want to compile and run on my cluster! Why
won't you let me do that?!"
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