This commit is related to an RFC from June 2014. Disscussion can be
found at:
http://www.open-mpi.org/community/lists/devel/2014/07/15140.php
The finalize function is set using either the linker option -fini or
__attribute__((destructor)) depending on compiler support. I have
confirmed that this hybrid approach works with all the major
compilers. The attribute is supported by gcc, clang, llvm, xlc, and
icc. The fini function will support pgi. If a compiler/linker
combination does not support either the destructor or fini function a
message will be printed on re-init indicating it is not supported (an
improvement over the current behavior-- SEGV).
I moved the following to the destructor function:
- Class system finalize. This solves a bug when MPI_T_finalize is
called before MPI_Init. The only downside to this change is we will
leave the footprint of the opal class system after
MPI_Finalize. This footprint should be relatively small.
This is an alternative to #517 but the two PRs are not
mutually-exclusive (with some modifications). This commit should also
be safe for 1.8.x as it does not change internal or external ABI (#517
changes internal ABI).
Signed-off-by: Nathan Hjelm <hjelmn@lanl.gov>
38589c46c0