chore: reduce overall diff

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

tools/pybind11Common.cmake

@@ -28,7 +28,11 @@ endif()
 # are in CONFIG mode, they should be "normal" targets instead.
 # In CMake 3.11+ you can promote a target to global after you create it,
 # which might be simpler than this check.
-if(NOT _pybind11_is_config)
+get_property(
+  is_config
+  TARGET pybind11::headers
+  PROPERTY IMPORTED)
+if(NOT is_config)
   set(optional_global GLOBAL)
 endif()
 
@@ -79,7 +83,7 @@ if(CMAKE_SYSTEM_NAME MATCHES Emscripten AND NOT _pybind11_no_exceptions)
   if(CMAKE_VERSION VERSION_LESS 3.13)
     message(WARNING "CMake 3.13+ is required to build for Emscripten. Some flags will be missing")
   else()
-    if(_pybind11_is_config)
+    if(_is_config)
       set_property(
         TARGET pybind11::pybind11_headers
         APPEND

tools/pybind11Config.cmake.in

@@ -222,7 +222,7 @@ include("${CMAKE_CURRENT_LIST_DIR}/pybind11Targets.cmake")
 add_library(pybind11::headers IMPORTED INTERFACE)
 set_target_properties(pybind11::headers PROPERTIES INTERFACE_LINK_LIBRARIES
                                                    pybind11::pybind11_headers)
-set(_pybind11_is_config ON)
+
 include("${CMAKE_CURRENT_LIST_DIR}/pybind11Common.cmake")
 
 if(NOT pybind11_FIND_QUIETLY)