tree 7647ef5b077a50db9b48bfdd39d3f682a95f7f7e
parent 9aefdaff2ef893e303a67ae61f5ed3789d02ee61
author Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no> 1586895872 +0200
committer Anas Nashif <anas.nashif@intel.com> 1587037394 -0400

cmake: FindPython3: Adjust python3 program search

Fixes: #24340

Using find_package(Python3 3.6) will select the highest available
python3.

This means that in case user has:
/usr/bin/python  --> python2.7
/usr/bin/python3 --> python3.6
/usr/bin/python3.6
/usr/bin/python3.8

then CMake will choose python 3.8.
This commit changes that behavior, so that in the above scenario, then
Python 3.6 will be preferred.

It also adds the following, python will be preferred over python3, if
both meets the minimum requirement.
For example:
/usr/bin/python  --> python3.6
/usr/bin/python3 --> python3.7
then Python 3.6 is prefered.

It further introduces PYTHON_PREFER variable, which can be used to
further control the behavior.
As example -DPYTHON_PREFER=python3.7 will choose Python 3.7 if
installed.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>