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

With CMake 3.3 or later, the if command supports an IN_LIST operator, e.g.:

if ("bar" IN_LIST _list)
 ...
endif()

For older versions of CMake, you can use the built-in list(FIND) function:

list (FIND _list "bar" _index)
if (${_index} GREATER -1)
  ...
endif()