BLD: fix build for py3k + pip. Closes #1857. Thanks to Erik Bray.

Also works inside a virtualenv.

numpy/distutils/ccompiler.py

@@ -58,7 +58,11 @@ def CCompiler_spawn(self, cmd, display=None):
     if s:
         if is_sequence(cmd):
             cmd = ' '.join(list(cmd))
-        print(o)
+        try:
+            print(o)
+        except UnicodeError:
+            # When installing through pip, `o` can contain non-ascii chars
+            pass
         if re.search('Too many open files', o):
             msg = '\nTry rerunning setup command until build succeeds.'
         else:

setup.py

@@ -167,6 +167,19 @@ def setup_package():
         if os.path.isfile(site_cfg):
             shutil.copy(site_cfg, src_path)
 
+        # Ugly hack to make pip work with Python 3, see #1857.
+        # Explanation: pip messes with __file__ which interacts badly with the
+        # change in directory due to the 2to3 conversion.  Therefore we restore
+        # __file__ to what it would have been otherwise.
+        global __file__
+        __file__ = os.path.join(os.curdir, os.path.basename(__file__))
+        if '--egg-base' in sys.argv:
+            # Change pip-egg-info entry to absolute path, so pip can find it
+            # after changing directory.
+            idx = sys.argv.index('--egg-base')
+            if sys.argv[idx + 1] == 'pip-egg-info':
+                sys.argv[idx + 1] = os.path.join(local_path, 'pip-egg-info')
+
     old_path = os.getcwd()
     os.chdir(src_path)
     sys.path.insert(0, src_path)