[CMake] FindPython3 Python_FIND_VIRTUALENV seems to be ignored

[Marc CHEVRIER]

This is a bug already identified (see https://gitlab.kitware.com/cmake/cmake/issues/19525).

I am currently working on a fix.
Le 1 août 2019 à 11:33 +0200, sebastian.mueller3 at zf.com, a écrit :
> Hi all,
>
> I’ve been trying to convince Cmake 15.1 to use the python installation in my virtual anaconda environment rather than the anaconda base installation.
> I’m using this to find python:
>
> set(Python3_FIND_VIRTUALENV "FIRST")
> find_package(Python3 3.6.8 EXACT COMPONENTS Development NumPy)
>
> First, I’m using Anaconda Prompt to execute the commands. I `activate testenv`, to activate my environment.
> When I then run `cmake .. -G "Visual Studio 14 2015 Win64"`, I get this output:
>
> -- Selecting Windows SDK version  to target Windows 10.0.16299.
> -- The C compiler identification is MSVC 19.0.24215.1
> -- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/x86_amd64/cl.exe
> -- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/x86_amd64/cl.exe – works
> -- Detecting C compiler ABI info
> -- Detecting C compiler ABI info – done
> -- Detecting C compile features
> -- Detecting C compile features - done
> -- Found Git: C:/app/tools/Git/cmd/git.exe (found version "2.17.1.windows.2")
> -- Could NOT find Python3: Found unsuitable version "3.6.4", but required is exact version "3.6.8" (found C:/app/anaconda3/libs/python36.lib)
> -- Configuring done
> -- Generating done
> -- Build files have been written to: D:/src/project/vsbuild
>
> I would expect cmake rather to find the python in C:/app/anaconda3/envs/testenv/… since this is the active environment and according to the
> HINT I set it to be favored over other python installations (as documented in https://cmake.org/cmake/help/v3.15/module/FindPython3.html).
>
> Additional info:
> $ which python
> C:/app/anaconda3/envs/testenv/python.exe
> $ python –version
> Python 3.6.8 :: Anaconda, Inc.
>
> I’m working on Windows 10. Any ideas what is going wrong?
>
> Kind regards/Viele Grüße
> Sebastian Müller
>
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