Fix test_distutils to not fail when running 'make test' from a Python build

directory that is not the source directory (ie, one created using
'/path/to/source/configure'.) Leaves this test very slightly degraded in
that particular case, compared to the build-in-sourcedir case, but that case
isn't a particularly strong test either: neither test the actual path that
will be used after installing. There isn't a particularly good way to test
this, and a poor test beats a failing test.

1 files changed, 2 insertions, 0 deletions

diff --git a/setup.py b/setup.py
index af15855f60..5df8124e6d 100644
--- a/setup.py
+++ b/setup.py
@@ -119,6 +119,8 @@ class PyBuildExt(build_ext):
             raise ValueError("No source directory; cannot proceed.")
 
         # Figure out the location of the source code for extension modules
+        # (This logic is copied in distutils.test.test_sysconfig,
+        # so building in a separate directory does not break test_distutils.)
         moddir = os.path.join(os.getcwd(), srcdir, 'Modules')
         moddir = os.path.normpath(moddir)
         srcdir, tail = os.path.split(moddir)