Using existing mpich for new built

[Ben Tay]

Hi,

I just compiled a shared version of PETSc. I realised that I've forgotten to
add --download-hypre=1 in the configure. Hence I need to rebuilt the PETSc.
Initially I had used --download-mpich=1 to built the mpich.

Before the "make all test", I got:

...

MPI:
  Includes: ['/nfs/lsftmp/g0306332/petsc-2.3.2-p8/externalpackages/mpich2-
1.0.4p1/atlas3/include']
  Library:  ['/nfs/lsftmp/g0306332/petsc-2.3.2-p8/externalpackages/mpich2-
1.0.4p1/atlas3/lib/libmpich.a', 'libnsl.a', 'librt.a']

...

I tried to "reuse" this library for the new built but it failed. It says

         UNABLE to CONFIGURE with GIVEN OPTIONS    (see configure.log for
details):
---------------------------------------------------------------------------------------
Shared libraries cannot be built using MPI provided.
Either rebuild with --with-shared=0 or rebuild MPI with shared library
support

My option is --with-mpi-include=/nfs/lsftmp/g0306332/petsc-2.3.2-p8
/externalpackages/mpich2-1.0.4p1/atlas3/include
--with-mpi-lib=/nfs/lsftmp/g0306332/petsc-2.3.2-p8/externalpackages/mpich2-
1.0.4p1/atlas3/lib/libmpich.a

I also changed libmpich.a to libmpich.so but the same error occurs. Is there
any way I can use the mpich which I built earlier.

Thanks.
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