[Python-Dev] test_gettext.py fails on 64-bit architectures

[Mark Favas]

(Tru64 Unix) - test_gettext fails with the message:
IOError: [Errno 0] Bad magic number: './xx/LC_MESSAGES/gettext.mo'

This is because the magic number is read in by the code in
Lib/gettext.py as FFFFFFFF950412DE (hex) (using unpack('<i',
buf[:4])[0]), and checked against LE_MAGIC (defined as 950412DE) and
BE_MAGIC (calculated as FFFFFFFFDE120495 using
struct.unpack('>i',struct.pack('<i', LE_MAGIC))[0]) These format strings
work for machines where a Python integer is the same size as a C int,
but not for machines where a Python integer is larger than a C int. The
problem arises because the LE_MAGIC number is negative if a 32-bit int,
but positive if Python integers are 64-bit. Replacing the "i" in the
code that generates BE_MAGIC and reads in "magic" by "I" makes the test
work for me, but there's other uses of "i" and "ii" when the rest of the
.mo file is processed that I'm unsure about with different inputs.

Mark
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