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

[Satish Balay]

Were you able to try Jacob's fix - so you could build with cxx?

Wrt building external pkgs - one way:

- first build pkgs:
./configure PETSC_ARCH=arch-pkgs --prefix=$HOME/soft/petsc-pkgs --with-cc=icc --with-cxx=icpc --with-fc=ifort --download-mpich --download-suitesparse

- now build PETSc with these pkgs
./configure PETSC_ARCH=arch-mybuild --with-mpi-dir=$HOME/soft/petsc-pkgs --with-cxx=0

[can't use --with-suitesparse-dir here - due to cxx dependencies within configure - but you disable this dependency check in configure - by commenting out one line of code]

Wrt configure options used - they are listed in configure.log - also in - for ex:

[balay at pj01 petsc]$ ls arch-linux-c-debug/externalpackages/*/*petsc*
arch-linux-c-debug/externalpackages/git.sowing/sowing.petscconf

Satish

On Fri, 21 Jul 2023, Barry Smith wrote:

> 
>   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
> > P: 617.648.8349  M: 415.205.4567
> > 
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