[mpich-discuss] Newbie getting started question?

[Evren Yurtesen IB]

Check with ldconfig -p if you see libmpichf90 in the output.

The .a files are for static linking, .so files are for dynamic linking. If 
you dont see the .a files, this simply means that your package does not 
include them. I have them on my Ubuntu box. (but I dont see them on a 
Fedora box)

$ apt-file search 'libmpichf90.a'
libmpich1.0-dev: /usr/lib/mpich/lib/libmpichf90.a
libmpich2-dev: /usr/lib/libmpichf90.a
$

If you are using fedora, try this before compiling, it should load all 
the necessary paths:

module load mpich2-x86_64

To be honest, I was using fedora until recently when I got fed up with 
it due to similar problems :)

Thanks,
Evren

On Fri, 14 Sep 2012, John Chludzinski wrote:

> $ mpif90 -o ex1 ex1.f95
> /usr/bin/ld: cannot find -lmpichf90
> /usr/bin/ld: cannot find -lmpichf90
> /usr/bin/ld: cannot find -lmpich
> collect2: ld returned 1 exit status
> 
> No go!
> 
> I used "yum install mpich2", should this bring the compiler wrapper? 
> 
> Why does the PETSc MPICH2 lib directory have *.a files while the newly
> installed MPICH2 have *.so files?
> 
> ---John
> 
> On Fri, Sep 14, 2012 at 5:54 PM, Anthony Chan <chan at mcs.anl.gov> wrote:
>       If the mpich2 installation you are using has Fortran 90 binding
>       correctly, you don't need -L<MPICH2_LIBDIR> when using mpif90.
>       The compiler wrapper should have taken care of setting all -L
>       flags to mpich2 libraries, try
>
>       mpif90 -o ex1 ex1.f95
>
>       A.Chan
>       ----- Original Message -----
>       > I have a small example program I've built and tested before
>       using
>       > MPICH2
>       > that come with the PETSc installation.
>       >
>       > I just installed MPICH2 on a new machine (without PETSc)
>       using: yum
>       > install
>       > mpich2.
>       >
>       > I added /usr/lib/mpich2/bin/ to my PATH env. variable and
>       tried:
>       > mpif90
>       > ex1.f95 -L/usr/lib/mpich2/lib/. This resulted in:
>       >
>       > /usr/bin/ld: cannot find -lmpichf90
>       > /usr/bin/ld: cannot find -lmpichf90
>       > /usr/bin/ld: cannot find -lmpich
>       >
>       > I checked and the PETSc installation has *.a files in the lib
>       > directory,
>       > whereas my new installation of MPICH2 has *.so files. What do
>       I need
>       > to do
>       > to get this to compile?
>       >
>       > ---John
>       >
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