c++ - Cmake option default value -

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if have cmakelists.txt file:

cmake_minimum_required(version 2.8)  option(foo "foo option" off)  message("foo? " ${foo})

and call cmake on it, following output:

foo? on

why this? haven't specified default foo off?

try this:

set(foo off cache bool "foo option")

or

set(foo off cache bool "foo option" force)

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