fix(cmake): findpython issues and 3.12 support for pybind11_find_import (#4941)

* fix(cmake): findpython issues and 3.12 support for pybind11_find_import

Signed-off-by: Henry Schreiner <[email protected]>

* Update pybind11NewTools.cmake

---------

Signed-off-by: Henry Schreiner <[email protected]>

Author: henryiii

tools/pybind11Common.cmake

@@ -218,8 +218,15 @@ if(NOT _pybind11_nopython)
 
     execute_process(
       COMMAND
-        ${${_Python}_EXECUTABLE} -c
-        "from pkg_resources import get_distribution; print(get_distribution('${PYPI_NAME}').version)"
+        ${${_Python}_EXECUTABLE} -c "
+try:
+    from importlib.metadata import version
+except ImportError:
+    from pkg_resources import get_distribution
+    def version(s):
+        return get_distribution(s).version
+print(version('${PYPI_NAME}'))
+        "
       RESULT_VARIABLE RESULT_PRESENT
       OUTPUT_VARIABLE PKG_VERSION
       ERROR_QUIET)

tools/pybind11NewTools.cmake

@@ -39,12 +39,23 @@ if(NOT Python_FOUND AND NOT Python3_FOUND)
     set(_pybind11_dev_component Development.Module OPTIONAL_COMPONENTS Development.Embed)
   endif()
 
+  # Callers need to be able to access Python_EXECUTABLE
+  set(_pybind11_global_keyword "")
+  if(NOT is_config AND NOT DEFINED Python_ARTIFACTS_INTERACTIVE)
+    set(Python_ARTIFACTS_INTERACTIVE TRUE)
+    if(NOT CMAKE_VERSION VERSION_LESS 3.24)
+      set(_pybind11_global_keyword "GLOBAL")
+    endif()
+  endif()
+
   find_package(Python 3.6 REQUIRED COMPONENTS Interpreter ${_pybind11_dev_component}
-                                              ${_pybind11_quiet})
+                                              ${_pybind11_quiet} ${_pybind11_global_keyword})
 
   # If we are in submodule mode, export the Python targets to global targets.
   # If this behavior is not desired, FindPython _before_ pybind11.
-  if(NOT is_config)
+  if(NOT is_config
+     AND NOT Python_ARTIFACTS_INTERACTIVE
+     AND _pybind11_global_keyword STREQUAL "")
     if(TARGET Python::Python)
       set_property(TARGET Python::Python PROPERTY IMPORTED_GLOBAL TRUE)
     endif()
@@ -53,6 +64,22 @@ if(NOT Python_FOUND AND NOT Python3_FOUND)
       set_property(TARGET Python::Module PROPERTY IMPORTED_GLOBAL TRUE)
     endif()
   endif()
+
+  # Explicitly export version for callers (including our own functions)
+  if(NOT is_config AND Python_ARTIFACTS_INTERACTIVE)
+    set(Python_VERSION
+        "${Python_VERSION}"
+        CACHE INTERNAL "")
+    set(Python_VERSION_MAJOR
+        "${Python_VERSION_MAJOR}"
+        CACHE INTERNAL "")
+    set(Python_VERSION_MINOR
+        "${Python_VERSION_MINOR}"
+        CACHE INTERNAL "")
+    set(Python_VERSION_PATCH
+        "${Python_VERSION_PATCH}"
+        CACHE INTERNAL "")
+  endif()
 endif()
 
 if(Python_FOUND)