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

1. 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})
   

2. Use foreach:

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

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In regard to answer above: 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})

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I had trouble with this FILE(GLOB command. (I'm on cmake 3.17.3) Otherwise the macro works great. I was getting FILE GLOB errors, something like "FILE GLOB requires a glob expression after the directory." (Maybe it didn't like RELATIVE and/or just using the curdir as the fourth paramter.)

I had to use:

FILE(GLOB children ${curdir}/*)

(taking out RELATIVE and the first ${curdir} (Please note my cmake version above, that could've been my issue (I'm unfamiliar with glob so far.).)