[petsc-users] MPICH C++ compilers when using PETSC --with-cxx=0

[Pierre Jolivet]

> On 21 Jul 2023, at 5:11 PM, Robert Crockett via petsc-users <petsc-users at mcs.anl.gov> wrote:
> 
> Hello,
> I built PETSc with –with-cxx=0 in order to get around a likely Intel C++ compiler bug.
> However, the MPICH that also gets built by PETSc then picks up the wrong C++ compiler; mpicxx -show indicates that it is using G++, while mpicc is correctly using icc.
>  
> Is there a way to get PETSc to pass the correct C++ compiler for the MPICH build when using –with-cxx=0? I need to compile parts of my own program with mpicxx/icpc.

You could use 
$ export MPICH_CXX=icpc
But the fact that there is a mismatch is not a great sign.

Thanks,
Pierre

> Robert Crockett 
> Plasma Simulation Engineer | OCTO - Computational Products
> P: 617.648.8349  M: 415.205.4567
> 
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