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add libffi-7.dll to pypy on windows #2141

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Jul 12, 2021
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add libffi-7.dll to pypy on windows #2141

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ec3e379
add libffi-7.dll to pypy on windows
mattip Jul 11, 2021
1eb033b
add a news fragment
mattip Jul 11, 2021
587e3d2
Fix changelog
gaborbernat Jul 12, 2021
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1 change: 1 addition & 0 deletions docs/changelog/2141.feature.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
add libffi-7.dll to the hard-coded list of dlls for PyPy
2 changes: 1 addition & 1 deletion src/virtualenv/create/via_global_ref/builtin/pypy/pypy2.py
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Expand Up @@ -112,7 +112,7 @@ def modules(cls):

@classmethod
def _shared_libs(cls):
return ["libpypy-c.dll"]
return ["libpypy-c.dll", "libffi-7.dll"]
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Wouldn't this need to be version limited to newer pypy versions?

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no, the code to copy ignores missing files

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Oh, 🤔 wonder why 😆

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virtualenv/src/virtualenv/create/via_global_ref/builtin/pypy/common.py

Lines 45 to 49 in 17caadc

python_dir = Path(interpreter.system_executable).resolve().parent
for libname in cls._shared_libs():
src = python_dir / libname
if src.exists():
yield src

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Will it work without this DLL? Should we make it hard dependency rather than soft that it is now?

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Currently this DLL is soft depdency (so assuming that's not a bug), if in the future this is not the case we should make it hard dependency and version guard the hard dependency part.

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It would be nice to avoid this code altogether in favor of a more robust solution

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That wasn't my question. Can we say a usecase where pypy would work without this DLL with the current less robust solution? If yes, we can keep it a soft dependency. If not, it must be hard depedency.

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I am not sure what you mean, sorry. PyPy v7.3.5 will not have the libffi-7.dll and will work without it. Once the branch to add the dll gets merged, any future PyPy versions will require the dll. I am hopeful that branch will be merged before the PyPy v7.3.6 release, but it is dependent on a new release of virtualenv with this PR or one similar.

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On the other hand, I can envision a scenario where a packager like conda uses some OS-level utilities to avoid copying the dll. In this case even though the dlls are required, they are not copied by this code into the new virtualenv.


@classmethod
def sources(cls, interpreter):
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2 changes: 1 addition & 1 deletion src/virtualenv/create/via_global_ref/builtin/pypy/pypy3.py
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Expand Up @@ -62,4 +62,4 @@ def bin_dir(self):

@classmethod
def _shared_libs(cls):
return ["libpypy3-c.dll"]
return ["libpypy3-c.dll", "libffi-7.dll"]