On 02/09/2017 04:10 PM, Sergey Zakharchenko wrote:
cmake -DX=Y -P x.cmake
The above sets the *cache* variable X.
This x.cmake gives "X=Y":
SET(X)
MESSAGE("X=${X}")
The above unsets the *regular* variable X (leaving the cache variable X
intact).
This, too, gives "X=Y":
UNSET(X)
MESSAGE("X=${X}")
This also unsets the *regular* variable X.
To unset the cache variable unset(X CACHE) would have worked.
This one finally gives "X=" (which I would have expected in the first place):
SET(X "")
MESSAGE("X=${X}")
Now you've got both a regular and cache variable named X.
When expanded the regular variable takes precedence.
Is this OK? Is this documented anywhere?
https://cmake.org/cmake/help/v3.7/manual/cmake-language.7.html#variables
Nils
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