-# (callable) Get all of the files (source and includes) which have the given types.
-override filesoftype = $(foreach type,$1,$(patsubst %|$(type),%,$(filter %|$(type),$(types))))
+# (callable) Get all of the files (source and includes) which have the provided types.
+#
+# If a provided type begins with a `+´, it is analysed as a suffix, and all matching types will be used.
+override filesoftype = $(foreach typeorsuffix,$1,$(foreach type,$(if $(filter +%,$(typeorsuffix)),$(sort $(foreach suffixedtype,$(filter %$(typeorsuffix),$(types)),$(lastword $(subst |, ,$(suffixedtype))))),$(typeorsuffix)),$(patsubst %|$(type),%,$(filter %|$(type),$(types)))))