2009/12/20 Ross Boylan <rossboy...@stanfordalumni.org>:
> easy_install ZODB3 looked fairly good during installation until  the end:
> <quote>
> Processing transaction-1.0.0.tar.gz
> Running transaction-1.0.0\setup.py -q bdist_egg --dist-dir
> c:\users\ross\appdata\local\temp\easy_install-cw1i4f\transaction-1.0.0\egg-dist-tmp-z7nrfd
> Adding transaction 1.0.0 to easy-install.pth file
>
> Installed c:\python26\lib\site-packages\transaction-1.0.0-py2.6.egg
> Finished processing dependencies for ZODB3
> ********************************************************************************
> WARNING:
>
>        An optional code optimization (C extension) could not be compiled.
>
>        Optimizations for this package will not be available!
>
> Unable to find vcvarsall.bat
> ********************************************************************************
> </quote>
> This seems to say things will work, just not as fast as they could.  But
> I'm a little puzzled why things would work at all, since I don't have a
> build environment on the machine (well, there is a compiler that's part
> of the MS SDK, but I'm not really sure how capable or operational it
> is--it did seem to compile some sample C code in the kit).
>
> Is there a pure python fallback for the C code?  I thought ZODB had some
> C-level magic.

ZODB requires C-code modules to work, but pre-compiled win32 eggs are
available, and presumably that is what easy_install picked. It's not
clear to me what generated that warning, but then I don't use Windows.

Laurence
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