include BLDSHARED, $LDFLAGS for default
Issue #31
new
dijitso modules are loaded into Python. As such, it makes sense to me to use Python's own sysconfig to get the initial flags, rather than hardcoding -shared. This should work in more places by default than the current defaults, e.g. avoiding https://bitbucket.org/fenics-project/dolfin/pull-requests/507
import shlex
from distutils import sysconfig
flags = shlex.split(sysconfig.get_config_var('BLDSHARED'))[1:]
This includes things like the Python library dir and -bundle -undefined dynamic_lookup, which are the right flags for macOS, but not currently used.
Additionally, it would probably be appropriate to respect the standard environment variables $CXXFLAGS and $LDFLAGS, etc. in addition to the current support for $CXX.
Do either or both of these seem reasonable?
