OpenMPI Builds for MacOS 10.8 and Earlier, Targetting GCC

[Christopher Jones]

> 
> clang: warning: argument unused during compilation: '-I /opt/local/include/LegacySupport'
> clang: warning: argument unused during compilation: '-I /opt/local/include'
> clang: warning: argument unused during compilation: '-I /opt/local/include'
> clang: warning: argument unused during compilation: '-I /usr/local/include'
> clang: warning: argument unused during compilation: '-I /usr/local/include'
> clang: warning: argument unused during compilation: '-I /opt/local/include/LegacySupport'
> clang: warning: argument unused during compilation: '-I .'
> clang: warning: argument unused during compilation: '-I /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_science_openmpi/openmpi-gcc9/work/openmpi-4.1.0/opal/datatype'
> clang: warning: argument unused during compilation: '-I ../../opal/include'
> clang: warning: argument unused during compilation: '-I ../../ompi/include'
> clang: warning: argument unused during compilation: '-I ../../oshmem/include'
> clang: warning: argument unused during compilation: '-I ../../opal/mca/hwloc/hwloc201/hwloc/include/private/autogen'
> clang: warning: argument unused during compilation: '-I ../../opal/mca/hwloc/hwloc201/hwloc/include/hwloc/autogen'
> clang: warning: argument unused during compilation: '-I ../../ompi/mpiext/cuda/c'
> clang: warning: argument unused during compilation: '-I ../..'
> clang: warning: argument unused during compilation: '-I /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_science_openmpi/openmpi-gcc9/work/openmpi-4.1.0/opal/include'
> clang: warning: argument unused during compilation: '-I /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_science_openmpi/openmpi-gcc9/work/openmpi-4.1.0/orte/include'
> clang: warning: argument unused during compilation: '-I ../../orte/include'
> clang: warning: argument unused during compilation: '-I /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_science_openmpi/openmpi-gcc9/work/openmpi-4.1.0/ompi/include'
> clang: warning: argument unused during compilation: '-I /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_science_openmpi/openmpi-gcc9/work/openmpi-4.1.0/oshmem/include'
> 
> Given the includes for LegacySupport, is this being caused by that portgroup…?

No, not caused by the legacy support PG, as there are plenty of warnings above that are nothing to do with that, e.g. 

clang: warning: argument unused during compilation: '-I /usr/local/include'
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