[package] cpython/3.9.7: venvlauncher is not built

[ZbigniewRA]

Package and Environment Details (include every applicable attribute)

• Package Name/Version: cpython/3.9.7
• Operating System+version: Windows 10
• Compiler+version: Visual Studio 2019
• Docker image: ???
• Conan version: conan 1.45.0
• Python version: Python 3.9.6

Conan profile (output of conan profile show default or conan profile show <profile> if custom profile is in use)

[settings]
os=Windows
os_build=Windows
arch=x86_64
arch_build=x86_64
compiler=Visual Studio
compiler.version=16
build_type=Release
[options]
[conf]
[build_requires]
[env]

Steps to reproduce (Include if Applicable)

Python interpreter for Windows is built correctly, and it includes the venv package.
Unfortuantely python -m venv doesn't work on Windows without the venvlauncher.exe/venvwlauncher.exe, which should be built as well, and included in the bin directory (alongside python.exe and pythonw.exe).

Logs (Include/Attach if Applicable)

Click to expand log

Output from "python -m venv MyVenv":

Unable to copy 'C:\\Users\\Zbigniew\\.conan\\data\\cpython\\3.9.7\\_\\_\\package\\d140711d95cc16a85766a8fc3a551dfafe84cf63\\bin\\venvlauncher.exe'
Unable to copy 'C:\\Users\\Zbigniew\\.conan\\data\\cpython\\3.9.7\\_\\_\\package\\d140711d95cc16a85766a8fc3a551dfafe84cf63\\bin\\venvwlauncher.exe'
error : [WinError 2] The system cannot find the file specified

[ZbigniewRA]

The problem above is happening when I use default settings for cpython, like this:

[requires]
cpython/3.9.7

[generators]
cmake_multi

However if I add the following option everything works as expected:

[options]
cpython:shared=True

venvlauncher.exe is present (as \bin\Lib\venv\scripts\nt\python.exe), ensurepip works, and venv works.

If default setting shared=False is unsupported on Windows, maybe it can be added to the validation step?

[tk-tnz]

Hi,

I have the same issue, but usingcpython:shared=True does not fix it. It's downloading package 6b6a5b8333d2f388bcda263a58a797b73d8e6016 from conan-center plus its dependencies, and venvlauncher.exe is not present.

@ZbigniewRA are you using other options?

My settings:

[settings]
arch=x86_64
arch_build=x86_64
build_type=Release
compiler=Visual Studio
compiler.cppstd=None
compiler.runtime=MD
compiler.version=16
os=Windows
os_build=Windows
[options]
[build_requires]
[env]
CC=cl.exe
CXX=cl.exe

[ZbigniewRA]

Conan is downloading in my case:

• for Release: cpython/3.9.7:6b6a5b8333d2f388bcda263a58a797b73d8e6016
• for Debug: cpython/3.9.7:3026f51f36d0fcdff1e3d757f74d6bcf34bb2873

The venvlaunchers are under 6b6a5b8333d2f388bcda263a58a797b73d8e6016\bin\Lib\venv\scripts\nt directory, and they are called python.exe and pythonw.exe (which is correct).
Also note that \bin\Lib\ensurepip\_bundled directory contains setuptools and pip wheels, which are also needed for python -m venv XXX to work.

This is my full conanfile.txt:

Click to expand

[requires]
boost/1.78.0
poco/1.11.1
ms-gsl/3.1.0
cpython/3.9.7 # Use 3.7.12 if you want to debug using Visual Studio 2019.
pybind11/2.9.1
gtest/1.11.0
nlohmann_json/3.10.4
benchmark/1.6.0
nvtx/3.0.1
termcolor/2.0.0
date/3.0.1
tclap/1.2.4
fast-cpp-csv-parser/cci.20200830

[options]
cpython:shared=True # Doesn't build properly on Windows without it. See: https://github.com/conan-io/conan-center-index/issues/9333

[generators]
cmake_multi

My Conan profile is in the report at the top.

[tk-tnz]

Thanks @ZbigniewRA, it's working now indeed - not sure why I had the same error before, despite cleaning up the package and re-installing. And thanks for finding out about the shared=True, at least I can keep moving forward.

[Ahajha]

I think this is due to the static cpython not supporting modules, and static is the default. I think we could/should change the default, at least on Windows.