Steve Dower added the comment:

I don't even know what pgen is or why I'd want to build it...

If running it updates a file that would trigger a rebuild, then I'd really like 
it to copy what _freeze_importlib currently does as far as writing to a 
temporary file and conditionally overwriting the actual one. That is the most 
reliable way to avoid unnecessary rebuilds.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21107>
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