Separated crooked list-initialization technique from source argument parsing to utility macro.

Author: MrPointer

cmake/Platform/Utilities/CMakeArgumentsUtils.cmake

@@ -11,18 +11,10 @@
 function(parse_sources_arguments _return_var _reserved_options _reserved_single_values
         _reserved_multi_values _cmake_args)
 
-    # Prepare arguments for further inspection - Somewhat croocked logic due to CMake's limitations
-    # If an argument is an empty string, populate it with a theoritcally impossible value.
-    # just to have some value in it
-    if ("${_reserved_options}" STREQUAL "")
-        set(_reserved_options "+-*/")
-    endif ()
-    if ("${_reserved_single_values}" STREQUAL "")
-        set(_reserved_single_values "+-*/")
-    endif ()
-    if ("${_reserved_multi_values}" STREQUAL "")
-        set(_reserved_multi_values "+-*/")
-    endif ()
+    # Initialize argument-lists for further inspection
+    initialize_list(_reserved_options)
+    initialize_list(_reserved_single_values)
+    initialize_list(_reserved_multi_values)
 
     set(sources "") # Clear list because cmake preserves scope in nested functions
 

cmake/Platform/Utilities/ListUtils.cmake

@@ -5,6 +5,23 @@
 #                Must not be negative or greater than 'list_length'-1.
 #=============================================================================#
 macro(list_replace _list _index _new_element)
+
     list(REMOVE_AT ${_list} ${_index})
+
     list(INSERT ${_list} ${_index} "${_new_element}")
+
+endmacro()
+
+#=============================================================================#
+# Checks whether the given list is empty. If it is - Initializes it with a theoretically
+# impossible to reproduce value, so if it's used to check whether an item is in it
+# the answer will be false.
+#       _list - List to initialize.
+#=============================================================================#
+macro(initialize_list _list)
+
+    if ("${${_list}}" STREQUAL "")
+        set(${_list} "+-*/")
+    endif ()
+
 endmacro()