override compiler, but also linker

[John Donners]

Dear all,

I'm having some trouble with building a large software
package using libtool. It consists of many smaller libraries,
of which only one uses MPI for parallel processing.
I only want to use the MPI-compiler wrappers for this one,
but this is difficult with one libtool for the whole project.

The important section in libtool is:

# ### BEGIN LIBTOOL TAG CONFIG: FC
...
# A language specific compiler.
CC="ifort"

...
archive_cmds="\$CC -shared -nofor_main \$libobjs \$deplibs 
\$compiler_flags \${wl}-soname \$wl\$soname -o \$lib"
...

I can override the compiler by setting FC=mpif90 in the Makefile, so then it
calls libtool as follows:

/bin/sh ../../../../../../libtool --tag=FC   --mode=link mpif90 ...
libtool: link: mpif90 -shared -nofor_main ...

Unfortunately, this does not override the compiler used in the 
linker-command:

/bin/sh ../../../../../../libtool --tag=FC  --mode=link mpif90 ...
libtool: link: ifort -shared -nofor_main ...

Apparently, it keeps using the CC as defined in the selected section in 
libtool.

I solved the problem temporarily with the following change in libtool:

archive_cmds="\${FC:-\$CC} -shared -nofor_main \$libobjs \$deplibs 
\$compiler_flags \${wl}-soname \$wl\$soname -o \$lib"

which uses the correct linker command, both with and without setting FC.
But I guess there is a more appropriate (and permanent) way of doing this.
I hope you could help me with some suggestions.

Cheers,
John

--
John Donners
Consultant
OSD
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