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 <[email protected]>

cmake/dependencies/pybind11.cmake

@@ -12,6 +12,11 @@ function(find_pybind11)
  message(STATUS "pybind11 repository: ${pyAMReX_pybind11_repo} (${pyAMReX_pybind11_branch})")
  include(FetchContent)
  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(pyAMReX_pybind11_internal OR pyAMReX_pybind11_src)

setup.py

@@ -77,11 +77,18 @@ def build_extension(self, ext):
  r_dim = re.search(r"amrex_(1|2|3)d", ext.name)
  dims = r_dim.group(1).upper()
 
+ 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
+ f"-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, "amrex"),
  "-DCMAKE_VERBOSE_MAKEFILE=ON",
  "-DCMAKE_PYTHON_OUTPUT_DIRECTORY=" + extdir,
- "-DPython_EXECUTABLE=" + sys.executable,
  "-DAMReX_SPACEDIM=" + dims,
  ## variants
  "-DAMReX_OMP=" + AMReX_OMP,