Wrap cmake policies in an if statement

TrentHouliston · fpistm · commit 7c3c9f0d5b85 · 2023-10-30T09:36:54.000+01:00
diff --git a/cmake/FindArduinoCtags.cmake b/cmake/FindArduinoCtags.cmake
@@ -6,7 +6,9 @@ function(get_ctags)
 
   # Prevent warnings in CMake>=3.24 regarding ExternalProject_Add()
   # cf. https://cmake.org/cmake/help/latest/policy/CMP0135.html
-  cmake_policy(SET CMP0135 OLD)
+  if (POLICY CMP0135)
+    cmake_policy(SET CMP0135 OLD)
+  endif()
 
   cmake_host_system_information(
     RESULT HOSTINFO
diff --git a/cmake/ensure_core_deps.cmake b/cmake/ensure_core_deps.cmake
@@ -61,7 +61,9 @@ function(declare_deps CORE_VERSION)
 
   # Prevent warnings in CMake>=3.24 regarding ExternalProject_Add()
   # cf. https://cmake.org/cmake/help/latest/policy/CMP0135.html
-  cmake_policy(SET CMP0135 OLD)
+  if (POLICY CMP0135)
+    cmake_policy(SET CMP0135 OLD)
+  endif()
 
   file(REAL_PATH "${DL_DIR}/package_stmicroelectronics_index.json" JSONFILE)
   if (NOT EXISTS ${JSONFILE})
