For https://github.com/PX4/Firmware/pull/14401 I had to add a python package to the toolchain which is usually a small thing and quite well automated. I did it and the Windows CI build went further than looking for that python package but failed in different other random nuttx build places which were not the same for fmu-v5 and fmu-v2.
It took me some debugging today to find out what all these random places have in common: they call the python binary directly from the path without any cmake discovery or version e.g. python2 or python3 specification. Then I checked and it seems the Cygwin developers stopped defaulting to adding a symbolic link to Python 2 and also don't add one to Python 3 at least if you install both versions which I for now still do for backwards compatibility to PX4 stable v1.9.2, v1.10.1.
So the fix is to add a symbolic link to the default python version you want to use manually which I added to the beginning of the install-cygwin-python-packages.bat script. I chose Python 3 because 2 is deprecated and tested that all older PX4 versions that are still C++ compiler options wise compatible again build with that.
It might be possible to remove Python 2 compatibility completely soon.
For https://github.com/PX4/Firmware/pull/14401 I had to add a python package to the toolchain which is usually a small thing and quite well automated. I did it and the Windows CI build went further than looking for that python package but failed in different other random nuttx build places which were not the same for
fmu-v5andfmu-v2.It took me some debugging today to find out what all these random places have in common: they call the
pythonbinary directly from the path without any cmake discovery or version e.g.python2orpython3specification. Then I checked and it seems the Cygwin developers stopped defaulting to adding a symbolic link to Python 2 and also don't add one to Python 3 at least if you install both versions which I for now still do for backwards compatibility to PX4 stablev1.9.2,v1.10.1.So the fix is to add a symbolic link to the default python version you want to use manually which I added to the beginning of the
install-cygwin-python-packages.batscript. I chose Python 3 because 2 is deprecated and tested that all older PX4 versions that are still C++ compiler options wise compatible again build with that.It might be possible to remove Python 2 compatibility completely soon.