[CMake] FindPython3 Python_FIND_VIRTUALENV seems to be ignored

[sebastian.mueller3 at zf.com]

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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