A bug in struct module on the 64-bit platform?

[Neal Norwitz]

ahn1 at llnl.gov wrote:
> Hi,
>
> I have a user who complained about how "struct" module computes C
> struct data size on Itanium2 based 64-bit machine.

I wouldn't be surprised, but I don't understand the problem.

>    >>struct.calcsize('idi')
>    16
>    >>struct.calcsize('idid')
>    24
>    >>struct.calcsize('did')
>    20

These are what I would expect on a 32 or 64 bit platform.  i == int, d
== float.  ints are typically 4 bytes on 64 bit platforms.  If you want
8 byte integers, you typically need to use longs (format letter is ell,
l).

You didn't say which version of python, so it's possible this was a bug
that was fixed too.

On my system:

python: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for
GNU/Linux 2.4.1, dynamically linked (uses shared libs), not stripped

>>> struct.calcsize('l') #that's a lowercase ell
8

If you think it's a bug, you should file a bug report on source forge.

n