libtree/cmake/Modules/compdb.cmake

find_program(COMPDB_PATH
      NAME compdb
      PATHS ~/.local/bin/
            /bin
            /sbin
            /usr/bin
            /usr/sbin
            /usr/local/bin
            /usr/local/sbin
  )


if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)

  if (COMPDB_PATH)
    IF(NOT TARGET COMPD)
      add_custom_target(COMPD
        ALL
        DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/compile_commands.json
        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
        COMMAND ${COMPDB_PATH} -p ${CMAKE_CURRENT_BINARY_DIR} list >compile_commands.json
      )
    endif()
  endif()
endif()