darwin/Fortran: -single_module

[Ralf Wildenhues]

Hello everybody,

This topic starts here:
http://www.lam-mpi.org/MailArchives/lam/2005/11/11516.php
http://www.lam-mpi.org/MailArchives/lam/2005/11/11519.php

* Jack Howarth wrote on Fri, Nov 18, 2005 at 05:28:07AM CET:
>     I found a description of the problem I was seeing with the
> mpi enabled gromacs 3.3 build on MacOS X 10.4 in the following
> message...
> 
> http://gcc.gnu.org/ml/gcc/2005-06/msg00186.html
> 
> Using their suggestion, I patched gromacs as follows...

> +LIBS = @LIBS@ -Wl,-single_module

> which causes the linkage of libgmx_mpi.4.dylib to avoid the -multi-module
> default. However the lam developers may want to look carefully at the
> to see if the problem can be avoided in future releases of gromacs without
> resorting to this hack.

Libtool currently adds -single_module for C++ code only.  I guess we
should do that for Fortran as well.  What do you think?

A test for this in CVS HEAD would be cool, too..

Cheers,
Ralf