[CMake] passing by reference to a MACRO

[Jesse Corrington]

Is there anyway to have variables passed by reference to a macro so the
original will be updated. I'm pretty sure the answer is no, but maybe I just
don't know the syntax well enough. Here is what I'm trying to do:

MACRO( TEST_SET variable, value )
    SET( variable ${value} )
ENDMACRO()


SET( TEST_VAR "testvar" )
TEST_SET( TEST_VAR "newval" )
MESSAGE( SEND_ERROR ${TEST_VAR} )

prints out "testvar", but I want it to be "newval"
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