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How to check if a target has been added or not?

Suppose I have a cmake macro that adds a target (library or executable) based on some conditions

macro (conditionally_add target_name target_src condition)
  if (condition)
    add_library (target_name target_src)
  endif ()
endmacro()

My question: after calling this function

conditionally_add (mylib mysrc.cc ${some_condition})

How to check if a library has been added? In particular, I would like to do something below

if (my_lib_is_added)    # HOW TO DO THIS?
  # Do something.
endif ()
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2 answers


Use the TARGET

command suggestion if

:



conditionally_add (mylib mysrc.cc ${some_condition})
if (TARGET mylib)
  # Do something.
endif()
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There doesn't seem to be a way to iterate over targets in CMake so far, so you'll need to do it yourself.

You need to create a custom variant of the functions add_executable()

and add_library()

that will do something like



function(my_add_executable TARGET)
  list(APPEND MY_TARGETS ${TARGET})
  add_executable(${TARGET} ${ARGN}
endfunction()function(my_add_executable TARGET)
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