FindSQLite3: Use package name as namespace

As we (hopefully) move toward a CPS world, it is helpful for imported
targets to use the package name as the namespace (as required by CPS).
Modify FindSQLite3 to do so. The old name is retained for compatibility.

Help/release/dev/FindSQLite3-namespace.rst

@@ -0,0 +1,5 @@
+FindSQLite3-namespace
+---------------------
+
+* The :module:`FindSQLite3` module now provides imported
+  targets with the ``SQLite3::`` prefix.

Modules/FindSQLite3.cmake

@@ -21,10 +21,27 @@ Imported Targets
 
 This module provides the following :ref:`Imported Targets`:
 
-``SQLite::SQLite3``
+``SQLite3::SQLite3``
   Target encapsulating SQLite library usage requirements.  It is available only
   when SQLite is found.
 
+  .. versionadded:: 4.3
+
+``SQLite::SQLite3``
+  Deprecated.  Identical to ``SQLite3::SQLite3``.
+
+  If your project needs to support CMake < 4.3, consider adding the following
+  to your project after calling ``find_package(SQLite3 ...)``:
+
+  .. code-block:: cmake
+
+    if(NOT TARGET SQLite3::SQLite3) # CMake < 4.3
+      add_library(SQLite3::SQLite3 ALIAS SQLite::SQLite3)
+    endif()
+
+  This will allow your project to use the new name while still permitting it to
+  compile with older versions of CMake.
+
 Result Variables
 ^^^^^^^^^^^^^^^^
 
@@ -96,11 +113,18 @@ find_package_handle_standard_args(SQLite3
 if(SQLite3_FOUND)
     set(SQLite3_INCLUDE_DIRS ${SQLite3_INCLUDE_DIR})
     set(SQLite3_LIBRARIES ${SQLite3_LIBRARY})
+    if(NOT TARGET SQLite3::SQLite3)
+        add_library(SQLite3::SQLite3 UNKNOWN IMPORTED)
+        set_target_properties(SQLite3::SQLite3 PROPERTIES
+            IMPORTED_LOCATION             "${SQLite3_LIBRARY}"
+            INTERFACE_INCLUDE_DIRECTORIES "${SQLite3_INCLUDE_DIR}")
+    endif()
     if(NOT TARGET SQLite::SQLite3)
         add_library(SQLite::SQLite3 UNKNOWN IMPORTED)
         set_target_properties(SQLite::SQLite3 PROPERTIES
             IMPORTED_LOCATION             "${SQLite3_LIBRARY}"
-            INTERFACE_INCLUDE_DIRECTORIES "${SQLite3_INCLUDE_DIR}")
+            INTERFACE_INCLUDE_DIRECTORIES "${SQLite3_INCLUDE_DIR}"
+            DEPRECATION                   "The target name SQLite::SQLite3 is deprecated. Please use SQLite3::SQLite3 instead.")
     endif()
 endif()
 

Tests/FindSQLite3/Test/CMakeLists.txt

@@ -7,7 +7,7 @@ find_package(SQLite3 REQUIRED)
 add_definitions(-DCMAKE_EXPECTED_SQLite3_VERSION="${SQLite3_VERSION}")
 
 add_executable(test_tgt main.c)
-target_link_libraries(test_tgt SQLite::SQLite3)
+target_link_libraries(test_tgt SQLite3::SQLite3)
 add_test(NAME test_tgt COMMAND test_tgt)
 
 add_executable(test_var main.c)