Porting to OS X

I've been interested in using mpiP to try and understand some parallel bugs I've been having, and I like to use my laptop for small-scale debugging, so I started porting mpiP over to OS X.

I have a build that works without BFD or libelf/libdwarf support in https://github.com/spack/spack/pull/7146. The patch therein is inelegant, and I suspect there is a simpler one that will work better, but it's a starting point. Would the devs on this project be interested in a patch if I file a PR?

I also have a branch of spack that builds mpiP on OS X with libelf/libdwarf support, and I can build examples, but libdwarf throws an error in mpip (Code 134, DW_DLE_ARANGE_OFFSET_BAD: The debug_arange entry has a DIE offset that is larger than the size of the .debug_info section). I suspect this error might be due to spack packages inconsistently using GNU libtool or Apple's BSD libtool, but was wondering if you guys might have more insight into that bug, or interest in that capability.

Start with the OS X patch in spack PR #7146 and the branch that builds mpiP with libelf/libdwarf support. Reproduce the mpip Code 134 failure and the DW_DLE_ARANGE_OFFSET_BAD error, then determine what changes are needed for a successful OS X build with and without those optional libraries.