We have been having a problem lately with our MTT runs where make check
would fail when mpi threads were enabled.
Turns out the problem is that opal_init now calls
opal_base_carto_select, which cannot find any carto modules since we
have not done an install yet. So it returns a failure. This causes
opal_init to abort before initializing the event engine. So when we try
to do the threading tests, the event engine is uninitialized and fails.
So this is why it fails, but I do not know how best to fix it. Any
suggestions would be appreciated.