In the example below it appears the ${${target}} is evaluating the
variable name in ${target} within the scope of the local function, not
in the context of the caller as I would have expected. This is
apparently caused by the fact that both functions have local variables
named _dest. It's easier to illustrate than to explain so:
<code>
#-- STRING_APPEND(target s [dest])
#-- Appends string 's' to string 'target'. Result is placed in 'target'
unless
#-- a destination is specified as the last parameter
FUNCTION(STRING_APPEND target s)
IF(ARGN)
SET(_dest ${ARGV2})
ELSE()
SET(_dest ${target})
ENDIF()
SET(${_dest} "${${target}}${s}" PARENT_SCOPE)
ENDFUNCTION()
#-- LIST_JOIN(src target [sep])
#-- Takes a cmake list and flattens it out into a string, separated by
space
#-- or optionally 'sep'
FUNCTION(LIST_JOIN src target)
SET(_dest "")
IF(ARGN)
SET(_sep ${ARGV2})
ELSE()
SET(_sep " ")
ENDIF()
SET(_srcvals ${${src}})
LIST(LENGTH _srcvals _srclen)
IF(_srclen GREATER 0)
#-- Handle first element special case
LIST(GET _srcvals 0 _dest)
LIST(REMOVE_AT _srcvals 0)
FOREACH(_i ${_srcvals})
STRING_APPEND(_dest "${_sep}${_i}")
ENDFOREACH()
ENDIF()
SET(${target} ${_dest} PARENT_SCOPE)
ENDFUNCTION()
SET(x "hello")
MESSAGE(STATUS "${x}") #-- prints 'hello'
STRING_APPEND(x " world")
MESSAGE(STATUS "${x}") #-- prints 'hello world'
SET(y a b c)
MESSAGE(STATUS "${y}") #-- prints 'a;b;c'
LIST_JOIN(y z "-")
MESSAGE(STATUS "${z}") #-- should print 'a-b-c', instead we get
'_dest-c'
</code>
Adding the following debug print before the last line in STRING_APPEND
MESSAGE(STATUS "_dest = ${_dest}")
MESSAGE(STATUS "*target = ${${target}}")
Yields the following output
-- hello
-- _dest = x
-- *target = hello
-- hello world
-- a;b;c
-- _dest = _dest
-- *target = _dest
-- _dest = _dest
-- *target = _dest
-- _dest-c
If I change the name of the var _dest in the LIST_JOIN to a var name
that doesn't exist in STRING_APPEND (e.g. _dest_foo), everything works.
It appears that STRING_APPEND doesn't know that the value in ${target}
is associated with the parent scope.
The question I have at this point is:
a) Is this by design?
b) Am I just brain damaged for doing this?
c) Should I file a bug?
Thanks
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