diff -r c7ce67c9237a Lib/multiprocessing/forking.py
--- a/Lib/multiprocessing/forking.py	Thu Apr 28 17:27:59 2011 +0200
+++ b/Lib/multiprocessing/forking.py	Wed May 18 18:24:18 2011 +0400
@@ -319,11 +319,36 @@
             The "freeze_support()" line can be omitted if the program
             is not going to be frozen to produce a Windows executable.''')
 
+        flag_opt_map = {
+            'debug': 'd',
+            'py3k_warning': '3',
+            'division_warning': 'Q',
+            'division_new': 'Qnew',
+            'inspect': 'i',
+            'interactive': 'i',
+            'optimize': 'O',
+            'dont_write_bytecode': 'B',
+            'no_user_site': 's',
+            'no_site': 'S',
+            'ignore_environment': 'E',
+            'tabcheck': 't',
+            'verbose': 'v',
+            'unicode': 'U',
+            'bytes_warning': 'b',
+        }
+        args = []
+        for flag, opt in flag_opt_map.items():
+            v = getattr(sys.flags, flag)
+            if v > 0:
+                args.append('-' + opt * v)
+        for opt in sys.warnoptions:
+            args.append('-W' + opt)
+
         if getattr(sys, 'frozen', False):
-            return [sys.executable, '--multiprocessing-fork']
+            return [sys.executable] + args + ['--multiprocessing-fork']
         else:
             prog = 'from multiprocessing.forking import main; main()'
-            return [_python_exe, '-c', prog, '--multiprocessing-fork']
+            return [_python_exe] + args + ['-c', prog, '--multiprocessing-fork']
 
 
     def main():