Cython is called in incompatible way, not all options are supported (especially -I)

[rambo]

Checklist

• the issue is indeed a bug and not a support request
• issue doesn't already exist: https://github.com/kivy/python-for-android/issues
• I have a short, runnable example that reproduces the issue
• I reproduced the problem with the latest development version (p4a.branch = develop)
• I used the grave accent (aka backticks) to format code or logs when appropriated

Versions

• Python: 3.7 (also tried with 3.8)
• OS: Ubuntu 20.04
• Kivy: 1.11.1
• Cython: git master HEAD, 0.29.21, 0.29.19
• OpenJDK: 8u265-b01-0ubuntu2~20.04

Description

Compiling ZMQ recipe fails because cython is called in an incompatible way.

/home/rambo/.virtualenvs/py4a_37/bin/python3 -m Cython.Build.Cythonize --help

has different command line options from

/home/rambo/.virtualenvs/py4a_37/bin/cython --help

This (at least based on the recipe trying to pass -I options) is the correct script, unfortunately the Cython.Compiler.Main module cannot be called as a script (lack the if __name__ == '__main__' check so just changing the module in https://github.com/kivy/python-for-android/blob/develop/pythonforandroid/recipe.py#L1095 is not going to solve this.

buildozer.spec

Using p4a directly

Command:

p4a apk --private `pwd` --package=fi.advian.hellokv --use-setup-py --name "Hello kivy" --version 0.1 --bootstrap=sdl2 --requirements=python3,kivy --ndk-api=21 --ndk-dir=$HOME/.buildozer/android/platform/android-ndk-r19c --sdk-dir=$HOME/.buildozer/android/platform/android-sdk/

Logs

See https://gist.github.com/rambo/feab17c51a742b3d1f2239295298732b