Fix MUMPS libraries discovery: find_library doesn't find libraries when "lib" prefixes are included in names

[yurivict]

No description provided.

[dariomangoni]

@yurivict with which Makefile/CMakeLists are you building Mumps?
Are you, by any chance, using scivision/mumps? If so, I would be really happy BTW.
Anyway, in the official Mumps Makefile the naming is with the lib prefix, e.g.

mumps_lib:    $(incdir)/mumps_int_def.h \
              $(libdir)/libmumps_common$(PLAT)$(LIBEXT) \
              $(libdir)/lib$(ARITH)mumps$(PLAT)$(LIBEXT)

so I would suggest you to not delete the lib-prefixed libraries names, but to use the find_library with the NAMES options instead, so to allow to look for both naming standards, e.g.

find_library(MUMPS_ONLY_LIBRARY_COMMON
			 NAMES "libmumps_common" "mumps_common"
			 PATHS ${MUMPS_ROOT}
			 PATH_SUFFIXES "lib" "lib64" "libraries"
         )

Because of this I wouldn't merge this PR as is.

A separate comment applies to the PATH_SUFFIXES directory that you changed for the Mumps shared library version.
I was not aware of the different installation folders between different OS. In order to be compliant with any OS then I would rather add lib to PATH_SUFFIXES instead of replacing bin with lib.

It would be great if you have time to fix this few things, but obviously we can do it ourselves too!

[yurivict]

I install MUMPS using the FreeBSD port math/mumps that uses the upstream URL http://www.code-aster.org/FICHIERS/aster-xxx.tar.gz

I experimented and found that cmake's find_library doesn't find shared libraries when the name argument has the lib prefix included in it.