Spack Build Issues

with clang on sierra, python builds w/o ctypes support: This causes py-setuptools to fail.

==> '/p/gpfs1/cyrush/2018.11.ascent.xlc/ascent/uberenv_libs/spack/opt/spack/linux-rhel7-ppc64le/clang-coral/python-2.7.15-nc4tjupjudvrdyck4mj53i33p3q4tk5u/bin/python2.7' '-s' 'setup.py' '--no-user-cfg' 'build'
Traceback (most recent call last):
  File "setup.py", line 11, in <module>
    import setuptools
  File "/tmp/cyrush/spack-stage/spack-stage-3MVWpq/setuptools-40.2.0/setuptools/__init__.py", line 16, in <module>
    from setuptools.dist import Distribution, Feature
  File "/tmp/cyrush/spack-stage/spack-stage-3MVWpq/setuptools-40.2.0/setuptools/dist.py", line 25, in <module>
    from setuptools import windows_support
  File "/tmp/cyrush/spack-stage/spack-stage-3MVWpq/setuptools-40.2.0/setuptools/windows_support.py", line 2, in <module>
    import ctypes
  File "/p/gpfs1/cyrush/2018.11.ascent.xlc/ascent/uberenv_libs/spack/opt/spack/linux-rhel7-ppc64le/clang-coral/python-2.7.15-nc4tjupjudvrdyck4mj53i33p3q4tk5u/lib/python2.7/ctypes/__init__.py", line 7, in <module>
    from _ctypes import Union, Structure, Array
ImportError: No module named _ctypes

with clang on sierra, fortran compiler wrappers aren't working, causing CMake's FindMPI to fail.

     35    -- Unable to determine MPI from MPI driver /usr/tce/packages/spectrum-mpi/spectrum-mpi-rolling-release-clang-upstream-2018.12.03/bin/mpif90
  >> 36    CMake Error at /usr/WS1/cyrush/2019.01.conduit.build/conduit/scripts/uberenv_libs_test_lassen_clang/spack/opt/spack/linux-rhel7-ppc64le/clang-coral/cmake-3.9.6-mfftj4x3yhtwt57zc6dtfecvcflybkqy/sha
           re/cmake-3.9/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
     37      Could NOT find MPI_Fortran (missing: MPI_Fortran_LIBRARIES

On intel on cori, python+shared ends up with a python polluted by the system python:

import sys;from distutils.sysconfig import get_python_inc;sys.stdout.write(get_python_inc())
/usr/include/python2.7