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

Barry Smith bsmith at petsc.dev
Fri Jul 21 10:35:05 CDT 2023

  No, you will need to build MPICH yourself, stand-alone and then direct PETSc's configure to use what you have built.


> On Jul 21, 2023, at 11:11 AM, 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.
> Robert Crockett 
> Plasma Simulation Engineer | OCTO - Computational Products
> P: 617.648.8349  M: 415.205.4567
> 4650 Cushing Pkwy, Fremont CA 94538 USA 
> lamresearch.com <https://www.lamresearch.com/>
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