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

[Barry Smith]

  You need to look in the configure.log you to see the exact configure/cmake command PETSc configure is using for each package it builds specific to that run of PETSc configure. We do not save them in some other place.



> On Jul 21, 2023, at 12:14 PM, Robert.Crockett at lamresearch.com wrote:
> 
> Can I easily get the MPICH config PETSc uses? I’m poking through the repo and not seeing anything related to config of downloaded packages.
> Thanks,
> Robert
>  
> From: Barry Smith <bsmith at petsc.dev <mailto:bsmith at petsc.dev>> 
> Sent: Friday, July 21, 2023 11:35 AM
> To: Crockett, Robert <Robert.Crockett at lamresearch.com <mailto:Robert.Crockett at lamresearch.com>>
> Cc: petsc-users at mcs.anl.gov <mailto:petsc-users at mcs.anl.gov>
> Subject: Re: [petsc-users] MPICH C++ compilers when using PETSC --with-cxx=0
>  
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>  
> 
>  
>   No, you will need to build MPICH yourself, stand-alone and then direct PETSc's configure to use what you have built.
>  
>   Barry
>  
> 
> 
> On Jul 21, 2023, at 11:11 AM, Robert Crockett via petsc-users <petsc-users at mcs.anl.gov <mailto: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
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