Is it possible to build one Petsc that works for both C and C++?

[Matthew Knepley]

This is an MPICH problem. From mpicxx.h:

// There is a name conflict between stdio.h and the MPI C++ binding
// with respect to the names SEEK_SET, SEEK_CUR, and SEEK_END.  MPI
// wants these in the MPI namespace, but stdio.h will #define these
// to integer values.  #undef'ing these can cause obscure problems
// with other include files (such as iostream), so we instead use
// #error to indicate a fatal error.  Users can either #undef
// the names before including mpi.h or include mpi.h *before* stdio.h
// or iostream.

#ifndef MPICH_IGNORE_CXX_SEEK
#ifdef SEEK_SET
#error "SEEK_SET is #defined but must not be for the C++ binding of MPI"
//#undef SEEK_SET
#endif
#ifdef SEEK_CUR
#error "SEEK_CUR is #defined but must not be for the C++ binding of MPI"
//#undef SEEK_CUR
#endif
#ifdef SEEK_END
//#undef SEEK_END
#error "SEEK_END is #defined but must not be for the C++ binding of MPI"
#endif
#endif

I recommend not including stdio.h yourself. PETSc will do it.

   Matt

On 6/17/07, Shi Jin <jinzishuai at yahoo.com> wrote:
> But this is what I got trying to compile my C petsc
> code with the C++ build:
> In file included from
> /mnt/200g/works/MyWork/PETSc/C++PETSc/petsc-2.3.3-p3/externalpackages/mpich2-1.0.5p4/linux-gnu-cxx-debug/include/mpi.h:1104,
>                  from spAF_incl.h:20,
>                  from spAF_analyt.h:11,
>                  from spAF_analyt.c:11:
> /mnt/200g/works/MyWork/PETSc/C++PETSc/petsc-2.3.3-p3/externalpackages/mpich2-1.0.5p4/linux-gnu-cxx-debug/include/mpicxx.h:26:2:
> error: #error "SEEK_SET is #defined but must not be
> for the C++ binding of MPI"
> /mnt/200g/works/MyWork/PETSc/C++PETSc/petsc-2.3.3-p3/externalpackages/mpich2-1.0.5p4/linux-gnu-cxx-debug/include/mpicxx.h:30:2:
> error: #error "SEEK_CUR is #defined but must not be
> for the C++ binding of MPI"
> /mnt/200g/works/MyWork/PETSc/C++PETSc/petsc-2.3.3-p3/externalpackages/mpich2-1.0.5p4/linux-gnu-cxx-debug/include/mpicxx.h:35:2:
> error: #error "SEEK_END is #defined but must not be
> for the C++ binding of MPI"
> make: *** [spAF_analyt.o] Error 1
>
> Did you do anything special? I am using GCC.
> Thanks.
>
> Shi
> --- Matthew Knepley <knepley at gmail.com> wrote:
>
> > On 6/17/07, Shi Jin <jinzishuai at yahoo.com> wrote:
> > > Hi,
> > >
> > > I am learning the unstructured part of Petsc,
> > which
> > > naturally uses C++(at least the sample I am
> > studying
> > > is C++). On the other hand, my old Petsc codes are
> > all
> > > written in C.
> > > I found that once I build the Petsc with C++, the
> > old
> > > C codes cannot be compiled since it is trying to
> > use
> > > mpicxx to compile the .c source files. However, I
> > do
> >
> > This should be no problem. I do it all the time. Any
> > C++
> > compiler can compile C just fine.
> >
> >   Matt
> >
> > > see after the configuration stage that there is a
> > > list:
> > > C compiler: mpicc
> > > C++ compiler: mpicxx
> > > Fortran compiler: mpif77
> > >
> > > Is it possible to instruct Petsc to use the
> > > corresponding  compiler for different source
> > codes?
> > > Thanks a lot.
> > > PS. This is how I configured my Petsc-2.3.3-p3:
> > > ./config/configure.py --with-cc=gcc --with-fc=g77
> > > --with-cxx=g++ --download-f-blas-lapack=1
> > > --download-mpich=1 --with-clanguage=cxx
> > --with-sieve=1
> > > --download-boost=1 --download-chaco
> > > --download-parmetis   --download-fiat
> > --download-generator
> > >
> > >
> > >
> > >
> >
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> >
> > --
> > What most experimenters take for granted before they
> > begin their
> > experiments is infinitely more interesting than any
> > results to which
> > their experiments lead.
> > -- Norbert Wiener
> >
> >
>
>
>
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-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which
their experiments lead.
-- Norbert Wiener