Convert "srcdir" into an absolute path if that seems prudent.  Currrently the only user of this is Lib/distutils/tests/test_build_ext.py (in order to find the source for xxmodule.c).  I'm not sure if other platforms need similar tweaks, I'm not brave enough to attempt it without being able to test.
Convert "srcdir" into an absolute path if that seems prudent.  Currrently
the only user of this is Lib/distutils/tests/test_build_ext.py (in order
to find the source for xxmodule.c).  I'm not sure if other platforms
need similar tweaks, I'm not brave enough to attempt it without being
able to test.

pypa/setuptools,pypa/setuptools,pypa/setuptools