[BUG] Build error with Python 3.13: ‘_Py_SetProgramFullPath’ was not declared in this scope

[pulver]

When building with Python 3.13 running invoke agent.build results in a compiler error:

...
[ 29%] Building CXX object three/CMakeFiles/datadog-agent-three.dir/three.cpp.o
...
datadog-agent/rtloader/three/three.cpp:88:5: error: ‘_Py_SetProgramFullPath’ was not declared in this scope; did you mean ‘Py_GetProgramFullPath’?
   88 |     _Py_SetProgramFullPath(_pythonExe);
      |     ^~~~~~~~~~~~~~~~~~~~~~
      |     Py_GetProgramFullPath

Agent Environment

OS: Arch linux (2024-02-16)

[sgnn7]

Hi @pulver / @mattpulver ,
We are aware of this upcoming issue. As mentioned by @vickenty in the PR itself, limiting this API call to only supported Python versions without per-platform filtering will just obscure the fact that Python v3.13+ builds will not be able to fully support multiprocessing on Windows (used in some integrations OOTB). This is why the optimal fix needs to involve a bit more work to enable PyConfig initialization. We can leave this ticket open but the related opened PR as-is will not likely be integrated into the codebase.