make lcm-1.4.0 has strange error

[KailinTong]

I am reproducing this repo, where lcm-1.4.0 is a dependency. https://github.com/katie-hughes/unitree_ros2

I am using Ubuntu 22.04 and Python 3.11.5 When I tried to make lcm-1.4.0, I met the following error:.

/home/tongadm/lcm-1.4.0/lcm-python/module.c: In function ‘PyInit__lcm’:
/home/tongadm/lcm-1.4.0/lcm-python/module.c:46:34: error: lvalue required as left operand of assignment
   46 |     Py_TYPE(&pylcmeventlog_type) = &PyType_Type;
      |                                  ^
/home/tongadm/lcm-1.4.0/lcm-python/module.c:47:26: error: lvalue required as left operand of assignment
   47 |     Py_TYPE(&pylcm_type) = &PyType_Type;
      |                          ^
/home/tongadm/lcm-1.4.0/lcm-python/module.c:48:39: error: lvalue required as left operand of assignment
   48 |     Py_TYPE(&pylcm_subscription_type) = &PyType_Type;
      |                                       ^
make[2]: *** [lcm-python/CMakeFiles/lcm-python.dir/build.make:63: lcm-python/CMakeFiles/lcm-python.dir/module.c.o] Error 1
make[2]: Leaving directory '/home/tongadm/lcm-1.4.0/build'
make[1]: *** [CMakeFiles/Makefile2:1107: lcm-python/CMakeFiles/lcm-python.dir/all] Error 2
make[1]: Leaving directory '/home/tongadm/lcm-1.4.0/build'
make: *** [Makefile:163: all] Error 2

Do you have any ideas? Thank you in advance!

[nosracd]

I'm not familiar with that error, but older releases of LCM have issues with newer versions of Python. Have you tried building with an older version of Python or a newer version of LCM?

[KailinTong]

thank you very much for your reply. I would like to build LCM 1.4 with some older versions of Python. But do you know how to find which version of python is compatible with LCM 1.4?

[nosracd]

Unfortunately, I think your best bet will be trial and error. That information doesn't appear to have been documented anywhere in the 1.4 release.

It does appear there was Python 3 support. Also, LCM 1.4 was released in August 2018. So at the time the newest version of Python when LCM 1.4 was released would have been Python 3.7, so that may be a good starting point.