On 4 Nov 2013 03:00, "R. David Murray" <rdmur...@bitdance.com> wrote: > > I came across this in the VIM documentation: > > Vim can be built in four ways (:version output): > 1. No Python support (-python, -python3) > 2. Python 2 support only (+python or +python/dyn, -python3) > 3. Python 3 support only (-python, +python3 or +python3/dyn) > 4. Python 2 and 3 support (+python/dyn, +python3/dyn) > > Some more details on the special case 4: > > When Python 2 and Python 3 are both supported they must be loaded dynamically. > > When doing this on Linux/Unix systems and importing global symbols, this leads > to a crash when the second Python version is used. So either global symbols > are loaded but only one Python version is activated, or no global symbols are > loaded. The latter makes Python's "import" fail on libraries that expect the > symbols to be provided by Vim. > > I've never played with embedding Python. Does this make sense to > anyone who has? Is there some limitation in our embedding and/or > import machinery here, or is this more likely to be a shortcoming on > the VIM side? > > Mostly I'm asking out of curiosity in hopes of learning something; > I doubt I'll have enough motivation to make time to work on solving this.
Essentially what Greg said - we export many of the same symbols from both shared libraries, so if you try to load both CPython 2 and 3 into one process, the dynamic linker isn't going to be happy about it at all. Since making it work would be a lot of work for minimal benefit, the most that could realistically be done is to make it fail a little more gracefully (I believe that would need to be done on the Vim side of things, though). Cheers, Nick. > > --David > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: https://mail.python.org/mailman/options/python-dev/ncoghlan%40gmail.com
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