Automatically propagate minimum required CMake version

The package config and tests take the minimum required CMake version
from the main project.

Also introduce the maximum supported CMake version for policy management.

CMakeLists.txt

@@ -25,10 +25,17 @@ SOFTWARE.
 
 cmake_minimum_required(VERSION 3.25)
 
-# If CMake >=3.24 is used, set policies up to v3.24 to NEW
-# if (NOT ${CMAKE_VERSION} VERSION_LESS 3.24)
-#     cmake_policy(VERSION 3.24)
-# endif()
+set(CMAKE_MAXIMUM_SUPPORTED_VERSION 3.28)
+
+# If CMAKE_VERSION <= CMAKE_MAXIMUM_SUPPORTED_VERSION is used, set policies up
+# to CMAKE_VERSION to NEW
+if (${CMAKE_VERSION} VERSION_LESS_EQUAL ${CMAKE_MAXIMUM_SUPPORTED_VERSION})
+    cmake_policy(VERSION ${CMAKE_VERSION})
+# If CMAKE_VERSION > CMAKE_MAXIMUM_SUPPORTED_VERSION is used, set policies up to
+# CMAKE_MAXIMUM_SUPPORTED_VERSION to NEW
+else ()
+    cmake_policy(VERSION ${CMAKE_MAXIMUM_SUPPORTED_VERSION})
+endif()
 
 project(LoadStaticSharedTargets VERSION 1.4.1 LANGUAGES NONE)
 

packaging/CMakeLists.txt

@@ -26,8 +26,13 @@ SOFTWARE.
 include(CMakePackageConfigHelpers)
 
 if (NOT DEFINED LoadStaticSharedTargets_INSTALL_CMAKEDIR)
-    set(LoadStaticSharedTargets_INSTALL_CMAKEDIR "${CMAKE_INSTALL_DATAROOTDIR}/cmake/${PROJECT_NAME}"
-        CACHE STRING "Path to LoadStaticSharedTargets CMake files")
+    set(
+        LoadStaticSharedTargets_INSTALL_CMAKEDIR
+        "${CMAKE_INSTALL_DATAROOTDIR}/cmake/${PROJECT_NAME}"
+        CACHE
+        STRING
+        "Path to LoadStaticSharedTargets CMake files"
+    )
 endif ()
 
 install(
@@ -42,10 +47,16 @@ write_basic_package_version_file(
     COMPATIBILITY SameMajorVersion
 )
 
+configure_file(
+    "LoadStaticSharedTargetsConfig.cmake.in"
+    "${CMAKE_CURRENT_BINARY_DIR}/LoadStaticSharedTargetsConfig.cmake"
+    @ONLY
+)
+
 install(
     FILES
     "${CMAKE_CURRENT_BINARY_DIR}/LoadStaticSharedTargetsConfigVersion.cmake"
-    "LoadStaticSharedTargetsConfig.cmake"
+    "${CMAKE_CURRENT_BINARY_DIR}/LoadStaticSharedTargetsConfig.cmake"
     "../src/cmake/LoadStaticSharedTargets.cmake"
     DESTINATION "${LoadStaticSharedTargets_INSTALL_CMAKEDIR}"
 )

packaging/LoadStaticSharedTargetsConfig.cmake → packaging/LoadStaticSharedTargetsConfig.cmake.in

@@ -23,12 +23,19 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 ]]
 
-cmake_minimum_required(VERSION 3.25)
+cmake_minimum_required(VERSION @CMAKE_MINIMUM_REQUIRED_VERSION@)
 
-# If CMake >=3.24 is used, set policies up to v3.24 to NEW
-# if (NOT ${CMAKE_VERSION} VERSION_LESS 3.24)
-#     cmake_policy(VERSION 3.24)
-# endif()
+set(CMAKE_MAXIMUM_SUPPORTED_VERSION @CMAKE_MAXIMUM_SUPPORTED_VERSION@)
+
+# If CMAKE_VERSION <= CMAKE_MAXIMUM_SUPPORTED_VERSION is used, set policies up
+# to CMAKE_VERSION to NEW
+if (${CMAKE_VERSION} VERSION_LESS_EQUAL ${CMAKE_MAXIMUM_SUPPORTED_VERSION})
+    cmake_policy(VERSION ${CMAKE_VERSION})
+# If CMAKE_VERSION > CMAKE_MAXIMUM_SUPPORTED_VERSION is used, set policies up to
+# CMAKE_MAXIMUM_SUPPORTED_VERSION to NEW
+else ()
+    cmake_policy(VERSION ${CMAKE_MAXIMUM_SUPPORTED_VERSION})
+endif()
 
 # include(LoadStaticSharedTargets) should work after this
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}")

tests/CMakeLists.txt

@@ -64,7 +64,12 @@ set(
 foreach (TEST_CASE IN LISTS TEST_CASES TEST_CASES_WITH_WARNING)
     add_test(
         NAME "${TEST_CASE}"
-        COMMAND "${CMAKE_COMMAND}" -D CMAKE_MINIMUM_REQUIRED_VERSION=${CMAKE_MINIMUM_REQUIRED_VERSION} -D "TEST_CASE=${TEST_CASE}" -P "./helpers/test_case_wrapper.cmake"
+        COMMAND
+        "${CMAKE_COMMAND}"
+        -D CMAKE_MINIMUM_REQUIRED_VERSION=${CMAKE_MINIMUM_REQUIRED_VERSION}
+        -D CMAKE_MAXIMUM_SUPPORTED_VERSION=${CMAKE_MAXIMUM_SUPPORTED_VERSION}
+        -D "TEST_CASE=${TEST_CASE}"
+        -P "./helpers/test_case_wrapper.cmake"
         WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
     )
 endforeach ()
@@ -72,7 +77,12 @@ endforeach ()
 foreach (TEST_CASE IN LISTS TEST_CASES_WITH_WARNING)
     add_test(
         NAME "${TEST_CASE}_check-warning"
-        COMMAND "${CMAKE_COMMAND}" -D CMAKE_MINIMUM_REQUIRED_VERSION=${CMAKE_MINIMUM_REQUIRED_VERSION} -D "TEST_CASE=${TEST_CASE}" -P "./helpers/test_case_wrapper.cmake"
+        COMMAND
+        "${CMAKE_COMMAND}"
+        -D CMAKE_MINIMUM_REQUIRED_VERSION=${CMAKE_MINIMUM_REQUIRED_VERSION}
+        -D CMAKE_MAXIMUM_SUPPORTED_VERSION=${CMAKE_MAXIMUM_SUPPORTED_VERSION}
+        -D "TEST_CASE=${TEST_CASE}"
+        -P "./helpers/test_case_wrapper.cmake"
         WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
     )
 

tests/helpers/test_case_wrapper.cmake

@@ -25,6 +25,16 @@ SOFTWARE.
 
 cmake_policy(VERSION ${CMAKE_MINIMUM_REQUIRED_VERSION})
 
+# If CMAKE_VERSION <= CMAKE_MAXIMUM_SUPPORTED_VERSION is used, set policies up
+# to CMAKE_VERSION to NEW
+if (${CMAKE_VERSION} VERSION_LESS_EQUAL ${CMAKE_MAXIMUM_SUPPORTED_VERSION})
+    cmake_policy(VERSION ${CMAKE_VERSION})
+# If CMAKE_VERSION > CMAKE_MAXIMUM_SUPPORTED_VERSION is used, set policies up to
+# CMAKE_MAXIMUM_SUPPORTED_VERSION to NEW
+else ()
+    cmake_policy(VERSION ${CMAKE_MAXIMUM_SUPPORTED_VERSION})
+endif()
+
 include("./helpers/assertions.cmake")
 include("../src/cmake/LoadStaticSharedTargets.cmake")