Re: problem with openmpi-1.8.4

I can confirm that the testcase cited is fixed with the
-flat_namespace linkage used in 1.8.4...

1.8.3 linked with -Wl,-commons,use_dylibs

% /sw/bin/mpif90 testmpi.f90
% mpirun -np 3 ./a.out
           0   10.000000000000000
           1  -300.00000000000000
           2  -150.00000000000000
           1 ---   0.0000000000000000
           2 ---   0.0000000000000000
           0 ---   0.0000000000000000

1.8.4 linked with -Wl,-flat_namespace

% /sw/bin/mpif90 testmpi.f90
% mpirun -np 3 ./a.out
           2  -150.00000000000000
           1  -300.00000000000000
           0   10.000000000000000
           2 ---  -300.00000000000000
           0 ---  -300.00000000000000
           1 ---  -300.00000000000000

Perhaps could add field for allowing flat_namespace shared libraries
that defaults to false. I do know of one other case that exists in
MacPorts but not fink. Their xorg-libXt package reveals that libXt has
forced -flat_namespace to work around overlapping symbols in motif
since 2003...

http://lists.apple.com/archives/x11-users/2003/Mar/msg00210.html

So, while rare, there may be cases where the shared library check on
-flat_namespace has to be be loosened.

On Sat, Dec 20, 2014 at 3:04 PM, Jack Howarth <[email protected]> wrote:
>    Upstream openmpi has decided that the fortran support openmpi
> shared libs must be linked with -flat_namespace.
>
> https://github.com/open-mpi/ompi/issues/259
>
> and resorted to the change...
>
> https://github.com/jsquyres/ompi/commit/a2444cc684a4e39ba3001e5ebb3cbbcfa3e54fbf
>
> which of course will break our current fink validation on shared libs.
> I will ping the darwin linker developer to see if he has any comments
> on whether this is a corner case that absolutely requires the use of
> -flat_namespace or they are missing an alternative fix for this issue.
>     If this is required, we will need some way to loosen the
> validation to allow for this linkage in openmpi 1.8.4.
>         Jack

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