custom target as a target library in cmake -

i have custom target in fact externally generated library want integrate in build.

add_custom_command(        output ${cmake_current_binary_dir}/liblib2.a        command make -f ${cmake_current_source_dir}/makefile liblib2.a)  add_custom_target(lib2          depends ${cmake_current_binary_dir}/liblib2.a) 

how can tell cmake target in fact library, where can found , headers ?

to clear : i don't want upper cmakelist using library having manually specify include folders , library location folder must done automatically (from target properties).

on standard cmake library have add interface_include_directories property in library cmakelists make cmake link app relevant -i , -l gcc parameters :

set_target_properties(lib1   properties   interface_include_directories   ${cmake_current_source_dir}) 

but in case of custom target don't know how to it.

any clue ?

thanks help.

---

thanks zaufi works!

for others may interested in embedded externally build target inside cmake here did :

cmake_minimum_required(version 2.8)  set(lib_file ${cmake_current_source_dir}/bin/liblib2.a) set(lib_header_folder ${cmake_current_source_dir}/include)  # how build result of library add_custom_command(output  ${lib_file}                    command make                     working_directory ${cmake_current_source_dir})  # create target out of library compilation result add_custom_target(lib2_target depends ${lib_file})  # create library target out of library compilation result add_library(lib2 static imported global) add_dependencies(lib2 lib2_target)  # specify library , find headers set_target_properties(lib2     properties     imported_location ${lib_file}     interface_include_directories ${lib_header_folder}) 

now in cmakelists.txt can somthing like

add_subdirectory(${root_dir}/lib1 bin/lib1) add_subdirectory(${root_dir}/lib2 bin/lib2) add_executable(app app.c ) target_link_libraries(app lib1 lib2) 

no need specify .a , .h are.

you can use add_library() , tell imported. then, using set_target_properties() can set required interface_xxx properties it. after that, can use ordinal target every other built project.