CMake: Replace mbed_set_language_standard with target_compile_features and remove MBED_TARGET_LABELS variable resetting

CMakeLists.txt

@@ -62,11 +62,6 @@ if(${MBED_TOOLCHAIN_FILE_USED})
     mbed_set_printf_lib(mbed-core ${MBED_PRINTF_LIB})
 endif()
 
-
-set(MBED_TARGET_LABELS
-    ${MBED_TARGET_LABELS} CACHE INTERNAL ""
-)
-
 target_compile_definitions(mbed-core
     INTERFACE
         ${MBED_TARGET_DEFINITIONS}
@@ -124,7 +119,12 @@ add_subdirectory(cmsis/device/rtos EXCLUDE_FROM_ALL)
 # Configures the application
 #
 function(mbed_configure_app_target target)
-    mbed_set_language_standard(${target})
+    # Set the language standard to use per target
+    target_compile_features(${target}
+        PUBLIC
+            c_std_11
+            cxx_std_14
+    )
 endfunction()
 
 #

tools/cmake/toolchain.cmake

@@ -46,23 +46,6 @@ set(CMAKE_CROSSCOMPILING TRUE)
 set(CMAKE_C_COMPILER_WORKS TRUE)
 set(CMAKE_CXX_COMPILER_WORKS TRUE)
 
-# Set the language standard to use per target
-function(mbed_set_language_standard target)
-    set_target_properties(${target}
-        PROPERTIES
-            C_STANDARD 11
-            C_STANDARD_REQUIRED YES
-            C_EXTENSIONS YES
-    )
-
-    set_target_properties(${target}
-        PROPERTIES
-            CXX_STANDARD 14
-            CXX_STANDARD_REQUIRED YES
-            CXX_EXTENSIONS YES
-    )
-endfunction()
-
 # Clear toolchains options for all languages as Mbed OS uses
 # different initialisation options (such as for optimization and debug symbols)
 set(CMAKE_C_FLAGS_DEBUG "" CACHE STRING "" FORCE)