Eryk Sun added the comment:
I would call SetDllDirectory instead of changing the current directory. This
replaces the current directory in the DLL search. Then call
SetDllDirectory(NULL) to restore the default before returning.
When you say "the CRT assembly", you're talking about vcruntime140.dll, right?
This module implements exceptions, setjmp/longjmp, and other functions that are
closely coupled with the VC++ version, but most of the universal CRT is
implemented in the system DLL ucrtbase.dll.
vcruntime was initially linked statically everywhere, but that was a problem
for extension modules, since each instance was taking a fiber locale storage
slot.
However, it really should be static for the bdist_wininst installer. I believe
Steve had the link configuration customized as a partially static build that
linked dynamically with ucrtbase.dll. This benefits from continuous CRT bug
fixes and security updates. To configure this he added ucrt[d].lib as a
dependency and ignored the default library libucrt[d].lib. See the following
diff for the changes that were made to revert this:
https://hg.python.org/cpython/diff/8374472c6a6e/PCbuild/pyproject.props
----------
nosy: +eryksun
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