[Python-Dev] runtime dlls on Windows (original) (raw)

Chris Barker chris.barker at noaa.gov
Thu May 26 13:12:53 EDT 2016

On Thu, May 26, 2016 at 9:53 AM, Chris Angelico <rosuav at gmail.com> wrote:

> BUT -- Steve Dower seems to have identified that the wonders of dll hell > never cease, and this isn't possible anyway. Oh well.

I'm not entirely grasping what's happening here.

me neither :-(

There are multiple versions of msvcp140.dll floating around out there; what happens if one app requires one of them and another requires another?

That's pretty much the dll hell that has plagued Windows FOREVER! why they don't do some versioning is totally beyond me, though 8.3 filenames have not been a restriction for a long time.

Can you simply say "take the newer one"?

I think that standard Windows policy/practice is that newer versions of a dll with the same name should always be backward compatible -- so something built against an older version should work with the newer one -- so you can ship a dll with a security patch, and it will all work. I presume that MS itself is careful about this with their runtimes.

Is there a way to instantly recognize that there's a newer one available, and ignore the older one?

I don't think so -- the linker will pick the first one it finds on the search path :-(

-CHB

--

Christopher Barker, Ph.D. Oceanographer

Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception

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