pybind11::float_(0.f) segfault

[sketch34]

pybind11::object obj = pybind11::float_(0.f);

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7ce2137 in PyFloat_FromDouble () from /usr/local/lib/libpython3.11.so.1.0

My first guess is something wrong with the library linking, but I'm not really sure where to start with this one, my test is very basic.

[sketch34]

Okay fixed. The issue was that pybind11::float_ and friends require that the Python interpreter be initialized on the C++ side if you are testing your pybind11 code within C++ only and not via python calls into your C++ module. In my simple test I added a pybind11::scoped_interpreter variable.

This was a somewhat costly gotcha. I suggest this be made clear in this section of the docs. I will open a PR.

  #include <pybind11/embed.h>
  ...
  
  pybind11::scoped_interpreter guard{};
  pybind11::object obj = pybind11::float_(0.f);