# Use this to set include paths which needs to be used by any target depending
# on a library. After the library name, you pass any number of paths.
macro(ROSA_set_external_include_reqs library)
  set(${library}_EXTERNAL_INCLUDES ${ARGN}
      CACHE INTERNAL "Externally required include paths for ${library}")
endmacro()

# Use this for a target to register library dependencies.
# It also adds external include paths if the library have set any.
# It ignores dependencies for ignored apps.
macro(ROSA_add_library_dependencies target dependencies)
  if( NOT DEFINED ${target}_APP_IGNORED )
    foreach( dependency ${dependencies} )
      target_link_libraries(${target} ${dependency})
      if( ${dependency}_EXTERNAL_INCLUDES )
        include_directories(${${dependency}_EXTERNAL_INCLUDES})
      endif()
    endforeach()
  endif()
endmacro()

# Use this for an app to register its executable. If the app is not included in
# the build, it will be ignored.
macro(ROSA_add_app app sources)
  if( ${app} IN_LIST ROSA_INCLUDE_APPS )
    add_executable(${app} ${sources})
  else()
    set(${app}_APP_IGNORED true)
  endif()
endmacro()