PYBIND11_FINDPYTHON=ON

Reuse our `find_package(Python ...)` call and use new CMake logic in
pybind11.
https://pybind11.readthedocs.io/en/stable/compiling.html#modules-with-cmake
https://cmake.org/cmake/help/latest/command/find_package.html#config-mode-version-selection

Signed-off-by: Axel Huebl <axel.huebl@plasma.ninja>

cmake/dependencies/pybind11.cmake

@@ -16,6 +16,11 @@ function(find_pybind11)
  message(STATUS "pybind11 repository: ${openPMD_pybind11_repo} (${openPMD_pybind11_branch})")
  endif()
  endif()
+
+ # rely on our find_package(Python ...) call
+ # https://pybind11.readthedocs.io/en/stable/compiling.html#modules-with-cmake
+ set(PYBIND11_FINDPYTHON ON)
+
  if(TARGET pybind11::module)
  # nothing to do, target already exists in the superbuild
  elseif(openPMD_USE_INTERNAL_PYBIND11 AND openPMD_pybind11_src)

setup.py

@@ -44,12 +44,19 @@ def build_extension(self, ext):
  if not extdir.endswith(os.path.sep):
  extdir += os.path.sep
 
+ pyv = sys.version_info
  cmake_args = [
+ # Python: use the calling interpreter in CMake
+ # https://cmake.org/cmake/help/latest/module/FindPython.html#hints
+ # https://cmake.org/cmake/help/latest/command/find_package.html#config-mode-version-selection
+ '-DPython_ROOT_DIR=' + sys.prefix,
+ f'-DPython_FIND_VERSION={pyv.major}.{pyv.minor}.{pyv.micro}',
+ '-DPython_FIND_VERSION_EXACT=TRUE',
+ '-DPython_FIND_STRATEGY=LOCATION',
  '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=' +
  os.path.join(extdir, "openpmd_api"),
  # '-DCMAKE_RUNTIME_OUTPUT_DIRECTORY=' + extdir,
  '-DopenPMD_PYTHON_OUTPUT_DIRECTORY=' + extdir,
- '-DPython_EXECUTABLE=' + sys.executable,
  '-DopenPMD_USE_PYTHON:BOOL=ON',
  # variants
  '-DopenPMD_USE_MPI:BOOL=' + openPMD_USE_MPI,