CMake : How to get the name of all subdirectories of a directory?

Use this macro:

MACRO(SUBDIRLIST result curdir)
  FILE(GLOB children RELATIVE ${curdir} ${curdir}/*)
  SET(dirlist "")
  FOREACH(child ${children})
    IF(IS_DIRECTORY ${curdir}/${child})
      LIST(APPEND dirlist ${child})
    ENDIF()
  ENDFOREACH()
  SET(${result} ${dirlist})
ENDMACRO()

Example:

SUBDIRLIST(SUBDIRS ${MY_CURRENT_DIR})

Use foreach:

FOREACH(subdir ${SUBDIRS})
  ADD_SUBDIRECTORY(${subdir})
ENDFOREACH()