unsetΒΆ
Unset a variable, cache variable, or environment variable.
unset(<variable> [CACHE | PARENT_SCOPE])
Removes the specified variable causing it to become undefined. If
CACHE
is present then the variable is removed from the cache instead
of the current scope.
If PARENT_SCOPE
is present then the variable is removed from the scope
above the current scope. See the same option in the set()
command
for further details.
<variable>
can be an environment variable such as:
unset(ENV{LD_LIBRARY_PATH})
in which case the variable will be removed from the current environment.