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-rw-r--r--Help/manual/cmake-generator-expressions.7.rst12
1 files changed, 10 insertions, 2 deletions
diff --git a/Help/manual/cmake-generator-expressions.7.rst b/Help/manual/cmake-generator-expressions.7.rst
index c5d7a31..eb9c9fe 100644
--- a/Help/manual/cmake-generator-expressions.7.rst
+++ b/Help/manual/cmake-generator-expressions.7.rst
@@ -44,8 +44,16 @@ Available boolean expressions are:
Logical Operators
-----------------
-``$<BOOL:condition>``
- ``1`` if the ``condition`` is true, else ``0``
+``$<BOOL:string>``
+ Converts ``string`` to ``0`` or ``1`` according to the rules of the
+ :command:`if()` command. Evaluates to ``0`` if any of the following is true:
+
+ * ``string`` is empty,
+ * ``string`` is a case-insensitive equal of
+ ``0``, ``FALSE``, ``OFF``, ``N``, ``NO``, ``IGNORE``, or ``NOTFOUND``, or
+ * ``string`` ends in the suffix ``-NOTFOUND`` (case-sensitive).
+
+ Otherwise evaluates to ``1``.
``$<AND:conditions>``
where ``conditions`` is a comma-separated list of boolean expressions.