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Jason R. Coombs <jaraco@jaraco.com> added the comment:

I managed to put together a Dockerfile that seemingly has the build tools installed (https://github.com/jaraco/jaraco.windows/blob/d2edad2e2af9d469189d7ac6a14a4ba6f6270348/Dockerfile).

When I attempt to build CPython, however, it fails with this error:

```
PS C:\code\public\cpython> PCBuild\build.bat
Using py -3.9 (found 3.9 with py.exe)
Fetching external libraries...
bzip2-1.0.6 already exists, skipping.
sqlite-3.35.5.0 already exists, skipping.
xz-5.2.2 already exists, skipping.
zlib-1.2.11 already exists, skipping.
Fetching external binaries...
libffi already exists, skipping.
openssl-bin-1.1.1k-1 already exists, skipping.
tcltk-8.6.11.0 already exists, skipping.
Finished.
Using "C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\MSBuild\Current\Bin\MSBuild.exe" (found in the PATH)
Using py -3.9 (found 3.9 with py.exe)

C:\code\public\cpython>"C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\MSBuild\Current\Bin\MSBuild.exe" "C:\code\public\cpython\PCbuild\pcbuild.proj" /t:Build /m /nologo /v:m /clp:summary /p:Configuration=Release /p:Platform=x64 /p:IncludeExternals=true /p:IncludeCTypes=true /p:IncludeSSL=true /p:IncludeTkinter=true /p:UseTestMarker= /p:GIT="C:\Program Files\Git\cmd\git.exe"
C:\code\public\cpython\PCbuild\python.props(111,31): error MSB4184: The expression "[System.Version]::Parse('')" cannot be evaluated. Version string portion was too short or too long. [C:\code\public\cpython\PCbuild\pythoncore.vcxproj]

Build FAILED.

C:\code\public\cpython\PCbuild\python.props(111,31): error MSB4184: The expression "[System.Version]::Parse('')" cannot be evaluated. Version string portion was too short or too long. [C:\code\public\cpython\PCbuild\pythoncore.vcxproj]
0 Warning(s)
1 Error(s)

Time Elapsed 00:00:00.15
```

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Jason R. Coombs <jaraco@jaraco.com> added the comment:

The build error is tracked in issue43298.

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Miro Hron?ok <miro@hroncok.cz> added the comment:

The test_entry_points_by_index test also fails on Fedora. See issue44451.

----------
nosy: +hroncok

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HEY GOOGLE <hectorizdaone@gmail.com> added the comment:

Addes aggreement

----------
components: +Build
nosy: +hectorizdaone
type: -> security

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Jason R. Coombs <jaraco@jaraco.com> added the comment:

In https://github.com/python/importlib_metadata/issues/324, I painstakingly created a library to perform robust performance monitoring of behaviors in the library and specifically added tests that capture the performance of entry_points against importlib_metadata 1.4 (the same code used in Python 3.9). I furthermore attempted to replicate the reported performance concerns reported using the exact commands, and even then, Python 3.10b3 indicates a 3x+ improvement in performance, dispelling the claim that the issue is order of complexity of the resolution of entry points by group.

I'll be open to new reports about performance concerns or other regressions w.r.t. the importlib.metadata changes, but please do not re-open this issue.

----------
resolution: -> fixed
status: open -> closed

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Change by Barry A. Warsaw <barry@python.org>:


----------
nosy: +barry

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