Index: Lib/distutils/util.py
===================================================================
--- Lib/distutils/util.py	(Revision 88440)
+++ Lib/distutils/util.py	(Arbeitskopie)
@@ -6,7 +6,7 @@
 
 __revision__ = "$Id$"
 
-import sys, os, string, re
+import sys, os, string, re, imp
 from distutils.errors import DistutilsPlatformError
 from distutils.dep_util import newer
 from distutils.spawn import spawn
@@ -533,7 +533,10 @@
             # Terminology from the py_compile module:
             #   cfile - byte-compiled file
             #   dfile - purported source filename (same as 'file' by default)
-            cfile = file + (__debug__ and "c" or "o")
+            if optimize >= 0:
+                cfile = imp.cache_from_source(file, debug_override=not optimize)
+            else:
+                cfile = imp.cache_from_source(file)
             dfile = file
             if prefix:
                 if file[:len(prefix)] != prefix: