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List:       cmake
Subject:    Re: [CMake] global variable passing up via INTERNAL cache
From:       "Tal Blum" <tblum () bbn ! com>
Date:       2007-11-29 23:17:38
Message-ID: 00af01c832de$0baee940$13162180 () d4m ! bbn ! com
[Download RAW message or body]

I only use one variable and I define 2 macros. The second macro is used to
initialize the list before I call APPEND_INTERNAL_LIST(). Notice that I do
not use a temp variable that is shared between calls and can cause problems.


# A macro for passing lists between different directories
# through an internal cache variable.
MACRO (APPEND_INTERNAL_LIST  LIST_NAME  VALUE)

   # If the list in not in the cache, create it.
   IF (${LIST_NAME})
      SET (${LIST_NAME} "${${LIST_NAME}};${VALUE}" CACHE INTERNAL "Internal
variable")
   ELSE (${LIST_NAME})
      SET (${LIST_NAME} "${VALUE}" CACHE INTERNAL "Internal variable")
   ENDIF (${LIST_NAME})

ENDMACRO (APPEND_INTERNAL_LIST)

# A macro for passing lists between different directories
# through an internal cache variable.
# This function empties the variable (usually because of older runs)
MACRO (INITIALIZE_INTERNAL_LIST  LIST_NAME)
   SET (${LIST_NAME} "" CACHE INTERNAL "Internal variable")
ENDMACRO (INITIALIZE_INTERNAL_LIST)


-Tal




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