$ ./python Lib/compileall.py
Listing /home/heimes/dev/python/py3k/Lib ...
Compiling /home/heimes/dev/python/py3k/Lib/pydoc.py ...
Traceback (most recent call last):
  File "Lib/compileall.py", line 162, in <module>
    exit_status = int(not main())
  File "Lib/compileall.py", line 155, in main
    success = compile_path()
  File "Lib/compileall.py", line 110, in compile_path
    force, quiet=quiet)
  File "Lib/compileall.py", line 65, in compile_dir
    ok = py_compile.compile(fullname, None, dfile, True)
  File "/home/heimes/dev/python/py3k/Lib/py_compile.py", line 137, in
compile
    codestring = f.read()
  File "/home/heimes/dev/python/py3k/Lib/io.py", line 1243, in read
    decoder = self._decoder or self._get_decoder()
  File "/home/heimes/dev/python/py3k/Lib/io.py", line 1132, in _get_decoder
    make_decoder = codecs.getincrementaldecoder(self._encoding)
  File "/home/heimes/dev/python/py3k/Lib/codecs.py", line 951, in
getincrementaldecoder
    decoder = lookup(encoding).incrementaldecoder
LookupError: unknown encoding: b'Latin-1'

I've fixed the bug in r58913. The modules need more unit tests.

Why is it still open?

I've left this bug open because no unit tests verifies that compileall
can compile all files under Lib/. It has caused a problem with the
Windows installer in 3.0a1 for some people.

I like to add a compileall followed by a cleanup to make testall. I hope
that's called before a release gets out.

Index: Makefile.pre.in
===================================================================
--- Makefile.pre.in     (Revision 58923)
+++ Makefile.pre.in     (Arbeitskopie)
@@ -610,7 +610,7 @@

 TESTOPTS=      -l $(EXTRATESTOPTS)
 TESTPROG=      $(srcdir)/Lib/test/regrtest.py
-TESTPYTHON=    $(RUNSHARED) ./$(BUILDPYTHON) -E -tt
+TESTPYTHON=    $(RUNSHARED) ./$(BUILDPYTHON) -E -tt -bb
 test:          all platform
                -find $(srcdir)/Lib -name '*.py[co]' -print | xargs rm -f
                -$(TESTPYTHON) $(TESTPROG) $(TESTOPTS)
@@ -618,6 +618,8 @@

 testall:       all platform
                -find $(srcdir)/Lib -name '*.py[co]' -print | xargs rm -f
+               $(TESTPYTHON) Lib/compileall.py
+               -find $(srcdir)/Lib -name '*.py[co]' -print | xargs rm -f
                -$(TESTPYTHON) $(TESTPROG) $(TESTOPTS) -uall
                $(TESTPYTHON) $(TESTPROG) $(TESTOPTS) -uall

Comitted in r59092