add basic c++ project setup

cmake/add_files.cmake

@@ -0,0 +1,33 @@
+#
+# Defines a list of files with a given name, prepends the relative path to the
+# source dir to each file if available and passes the list to PARENT_SCOPE.
+#
+# Usage:
+#	add_files(
+#		NAME_OF_FILES
+#		file1.cpp
+#		file2.cpp
+#		...
+#		)
+#
+macro(add_files var_name)
+	if(DEFINED SRC_DIR)
+		file (RELATIVE_PATH _relPath "${SRC_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}")
+	else()
+		file (RELATIVE_PATH _relPath "${CMAKE_SOURCE_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}")
+	endif()
+
+	foreach (_src ${ARGN})
+		if (_relPath)
+			list (APPEND ${var_name} "${_relPath}/${_src}")
+		else()
+			list (APPEND ${var_name} "${_src}")
+		endif()
+	endforeach()
+
+	if (_relPath)
+		set(${var_name} ${${var_name}} PARENT_SCOPE)
+	else()
+		set(${var_name} ${${var_name}})
+	endif()
+endmacro()