Using IBM's Visualage compiler to build Python on AIX,
requires small changes to the code, to let it compile
cleanly.
OS version: AIX 5.2
xlc version: 6

The changes are:
1 AIX defines hz as a preprocessor symbol and it
creates a conflict during preprocessing in the
_codecs_cn.c. This symbol has been selectively
undefined for AIX only
2.Trailing commas in an enum
3. Multiple defines of the _THREAD_SAFE symbol in
python/thread.c. This has been selectively undefined.

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These patches look fine except for the last chunk. I very
much doubt that xlc cannot handle multiple defines; ISO C
mandates that a redefine is allowed as long as the
replacement lists of the macros are identical (6.10.3p2). So
if xlc complains, it is likely that it has a different
definition than the one it reports a conflict is.

Also, it is unclear what precisely the conflict is: AFAICT,
Python never defines _THREAD_SAFE itself. So the conflict
must be between two AIX header files.

Can you please investigate this aspect further?

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Sorry for not responding, was a little busy. I will check
the last one - could be because of the patch levels too.
Will check and post it here.

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Most of this was already done by Guido's AIX patches. I
removed only the trailing commas in rev. 42498.