[SciPy-dev] Bugfix for weave's catalog.

[Fernando Perez]

Hi all,

there has been a long-standing bug in weave.inline, where it recompiles stuff 
it shouldn't.  I was finally able to track it down to a sys.path problem, 
where sys.path does not get the ~/.pythonXX_compiled directory added, and 
hence calls to pickle.load() fail when loading items from the shelved on-disk 
catalog.

The patch here fixes that problem.  In the process, I cleaned up catalog.py a 
bit, adding caching to the default_dir() call (which is used often) and adding 
a few catalog.close() calls for safety, since the semantics of shelved 
catalogs are undefined (implementation-dependent) if not explicitly closed.

I can commit this, but I'd greatly appreciate it if someone else has a look at 
it first (Pearu, RKern?).  I know that nobody likes to muck with the weave 
code, as it's a bit complex, but I'd feel safer if at least one more pair of 
eyeballs has a look at this before I commit.

Regards,

f
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