QOpenGLWidget has no attribute 'defaultFramebufferObject' on macos/arm64

when building from source with cmake on conda-forge on osx/arm64

the function defaultFramebufferObject is not available in pyside2 (5.15.7, 5.15.8)

I checked it is okay in pure c++ first just to be sure:

#include <QOpenGLWidget>
#include <QApplication>
#include <iostream>
int main(int argc, char *argv[])
{
  QApplication app(argc, argv);
  QOpenGLWidget oglw;
  std::cout << "defaultFramebufferObject=" << oglw.defaultFramebufferObject() << std::endl;
  return 0;
}

But in Python (all versions 3.8-3.11) it is not:

from PySide2.QtWidgets import QOpenGLWidget, QApplication
app = QApplication()
obj = QOpenGLWidget()
print('python.obj.defaultFramebufferObject', obj.defaultFramebufferObject())

I confirmed this by grep'ing defaultFramebufferObject on the Pyside2 binaries, where no .so module had this symbol contrary to all the other platforms (linux/x86_64, osx/x86_64, windows/x86_64, linux/aarch64)

This is our build script:

https://github.com/conda-forge/pyside2-feedstock/blob/main/recipe/build.sh

This has been confirmed on homebrew, so not likely a conda-forge issue:

https://github.com/napari/packaging/issues/35

Original report at conda-forge:

https://github.com/conda-forge/pyside2-feedstock/issues/142

I should add that it works for all native platforms, as well as linux/aarch64 for which we cross-compile like osx/arm64 (the difference being that we're able to run cross-compiled code there thanks to qemu for tests), so we rely on the native x86_64 shiboken, could the problem stem from there ?

Pyside6 is okay