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Merge topic 'doc-if-variable-not-defined' 

7a2c3f0c Help: Clarify if(<variable>) documentation (#15335)
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Brad King 2015-01-10 12:14:56 -05:00 committed by CMake Topic Stage
parent ccd0046667 7a2c3f0c0e
commit 427d932498
1 changed files with 5 additions and 4 deletions
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Help/command/if.rst
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@ -42,11 +42,12 @@ Possible expressions are:
or a non-zero number. False if the constant is ``0``, ``OFF``, or a non-zero number. False if the constant is ``0``, ``OFF``,
``NO``, ``FALSE``, ``N``, ``IGNORE``, ``NOTFOUND``, the empty string, ``NO``, ``FALSE``, ``N``, ``IGNORE``, ``NOTFOUND``, the empty string,
or ends in the suffix ``-NOTFOUND``. Named boolean constants are or ends in the suffix ``-NOTFOUND``. Named boolean constants are
case-insensitive. If the argument is not one of these constants, it case-insensitive. If the argument is not one of these specific
is treated as a variable. constants, it is treated as a variable or string and the following
signature is used.
``if(<variable>)`` ``if(<variable|string>)``
True if the variable is defined to a value that is not a false True if given a variable that is defined to a value that is not a false
constant. False otherwise. (Note macro arguments are not variables.) constant. False otherwise. (Note macro arguments are not variables.)
``if(NOT <expression>)`` ``if(NOT <expression>)``