[Pkg-openmpi-maintainers] Bug#886644: openmpi: alternatives for libmpi*.so are not multiarch-safe

[Alastair McKinstry]

Package: openmpi
Severity: important

openmpi installs links via alternatives for libmpi.so, as does mpich and lam.
Unfortunately its implementation is not multi-arch safe: there can be multiple multiarch implementations of libmpi.so present, but only one libmpi.so in /etc/alternatives.

The best practice (see lapack, etc.) is /etc/alternatives/libmpi.so.${ARCH}.

This needs to be fixed in both openmpi and mpich.

lam needs to be updated to be multi-arch aware too, as it uses /etc/alternatives/libmpi.so -> a non-m-a aware location.
                                                                                                                                                                                              
-- System Information:
Debian Release: 9.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 4.9.0-5-686-pae (SMP w/1 CPU core)
Locale: LANG=en_IE.UTF-8, LC_CTYPE=en_IE.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_IE.UTF-8), LANGUAGE=en_IE.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_IE.UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)