gevent recipe build fail

[RobertFlatt]

Logs

[1m[90m[DEBUG][39m[0m:   [90m->[0m running python3 setup.py build_ext [0m
[1m[90m[DEBUG][39m[0m:   	Traceback (most recent call last):
[1m[90m[DEBUG][39m[0m:   	  File "/home/bobf/ex/regression/.buildozer/android/platform/build-arm64-v8a/build/other_builds/gevent/arm64-v8a__ndk_target_21/gevent/setup.py", line 46, in <module>
[1m[90m[DEBUG][39m[0m:   	    from _setuplibev import libev_configure_command
[1m[90m[DEBUG][39m[0m:   	  File "/home/bobf/ex/regression/.buildozer/android/platform/build-arm64-v8a/build/other_builds/gevent/arm64-v8a__ndk_target_21/gevent/_setuplibev.py", line 34, in <module>
[1m[90m[DEBUG][39m[0m:   	    " && sh ./configure --host={} ".format(os.environ['TOOLCHAIN_PREFIX']),
[1m[90m[DEBUG][39m[0m:   	  File "/home/bobf/ex/regression/.buildozer/android/platform/build-arm64-v8a/build/other_builds/hostpython3/desktop/hostpython3/Lib/os.py", line 680, in __getitem__
[1m[90m[DEBUG][39m[0m:   	    raise KeyError(key) from None
[1m[90m[DEBUG][39m[0m:   	KeyError: 'TOOLCHAIN_PREFIX'

[AbdulkadirAktuerk]

did you find any solution to this problem?

[RobertFlatt]

No I didn't try.
I was just doing regression testing to see what didn't work. so I didn't care why it didn't work.

It looks like the issue is the the patch https://github.com/kivy/python-for-android/blob/develop/pythonforandroid/recipes/gevent/cross_compiling.patch
It expects TOOLCHAIN_PREFIX to be an environment variable, and it is not.
Seems reasonable this might be related to the NDK toolchain file at least if gevent uses cmake.

But I don't know anything about how gevent is built, so I know that I don't know.

[AndreMiras]

I could reproduce using the CI here:
https://github.com/kivy/python-for-android/actions/runs/14010021876/job/39228625376
Truncated log:

sh.ErrorReturnCode_1: 
  RAN: /home/user/.local/share/python-for-android/build/other_builds/hostpython3/desktop/hostpython3/native-build/python3 setup.py build_ext -v
  STDOUT:
Traceback (most recent call last):
  File "/home/user/.local/share/python-for-android/build/other_builds/gevent/x86__ndk_target_24/gevent/setup.py", line 46, in <module>
    from _setuplibev import libev_configure_command
  File "/home/user/.local/share/python-for-android/build/other_builds/gevent/x86__ndk_target_24/gevent/_setuplibev.py", line 34, in <module>
    " && sh ./configure --host={} ".format(os.environ['TOOLCHAIN_PREFIX']),
                                           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "<frozen os>", line 679, in __getitem__
KeyError: 'TOOLCHAIN_PREFIX'
  STDERR:
[INFO]:    STDOUT:
	Traceback (most recent call last):	
  File "/home/user/.local/share/python-for-android/build/other_builds/gevent/x86__ndk_target_24/gevent/setup.py", line 46, in <module>	
    from _setuplibev import libev_configure_command	
  File "/home/user/.local/share/python-for-android/build/other_builds/gevent/x86__ndk_target_24/gevent/_setuplibev.py", line 34, in <module>	
    " && sh ./configure --host={} ".format(os.environ['TOOLCHAIN_PREFIX']),	
                                           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^	
  File "<frozen os>", line 679, in __getitem__	
KeyError: 'TOOLCHAIN_PREFIX'

I'm not sure when this environment variable was removed, but the fix is fairly simple, you can simply recreate the environment variable within the get_recipe_env() method.
However this recipe is mapped to an old gevent version (1.4.0) released in January 2019, that's 7 years ago.
I'll try to update it to a more recent version when I get a chance

[AndreMiras]

I got it building successfully locally and I've opened a PR #3129