Best way to check with CMake whether list containts a specific entry

Question

I want to check whether a lists contains a specific entry like in the following code snipplet:

macro(foo)
if ($(ARGN} contains \"bar\")
  ...
endif
endmacro()
         


        

Answer 1

If the intention here is to add a value to a list but only if it's not already in the list, then an alternative approach is to just add it to the list and immediately remove possible duplicates again:

list(APPEND            SOME_LIST "value")
list(REMOVE_DUPLICATES SOME_LIST)