I want to replace custom byte-compiling function with calls to
compileall before 3.3b1, but in the short term it’s good to have this
fixed.

Adapted from the distutils patch by Jeff Ramnani.  I tested with -B, -O
and -OO; test_util and test_mixin2to3 fail in -O mode because lib2to3
doesn’t support it.

Patch by Hallvard B Furuseth.

I tested this manually; it would be great to have buildbots using
installed Pythons, including Pythons configured with different prefix
and exec-prefix.

Reported by Zsolt Cserna.

Patch by Jeff Ramnani.  Tested with -B, -O and -OO.

Patch by Hallvard B Furuseth.

Found by Franz Glasner in #2504.

as "The pipe is being closed") is now mapped to POSIX errno EPIPE
(previously EINVAL).

as "The pipe is being closed") is now mapped to POSIX errno EPIPE
(previously EINVAL).

Improve also str.replace(a, a) test

This worked under Unix because wchar_t is 4 bytes wide.

(except for a Py_UNICODE_strchr() call)

(on Martin's buildbot it still seems a bit inaccurate)

Example:
./python -m timeit -s "f='{}' + '-' * 1024 + '{}'; s='abcd' * 16384" "f.format(s, s)"

-> before: 547 usec per loop
-> after: 13 usec per loop
-> 3.2: 22.5 usec per loop
-> 2.7: 12.6 usec per loop

contents cannot be read.

an unreadable directory.

new test cases for importing bad packages and unreadable packages dirs.

Fuchs, updated by Tiago Gonçalves.