I just recently came across this:
set(BLAH blah CACHE INTERNAL "")
unset(BLAH)
message("BLAH: ${BLAH}")
Surprisingly (to me), this prints out "blah". I had expected the unset
command to make the cached value inaccessible. The documentation just
states that the function "[r]emoves the specified variable causing it to
become undefined." Is this a bug? I would prefer for the function to
guarantee that ${BLAH} comes up empty.
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