cmGeneratorExpressionEvaluator: Short-circuit boolean operators

Help/manual/cmake-generator-expressions.7.rst

@@ -195,6 +195,12 @@ Two forms of conditional generator expressions are supported:
   if ``condition`` is ``0``.  Any other value for ``condition`` results in an
   error.
 
+    .. versionadded:: 3.28
+
+    This generator expression short-circuits such that generator expressions in
+    ``false_string`` will not evaluate when ``condition`` is ``1``, and generator
+    expressions in ``true_string`` will not evaluate when condition is ``0``.
+
 Typically, the ``condition`` is itself a generator expression.  For instance,
 the following expression expands to ``DEBUG_MODE`` when the ``Debug``
 configuration is used, and the empty string for all other configurations:
@@ -252,6 +258,11 @@ The common boolean logic operators are supported:
   ``condition`` must be ``0`` or ``1``.  The result of the expression is
   ``0`` if ``condition`` is ``1``, else ``1``.
 
+  .. versionadded:: 3.28
+
+  Logical operators short-circuit such that generator expressions in the
+  arguments list will not be evaluated once a return value can be determined.
+
 .. _`Comparison Expressions`:
 
 Primary Comparison Expressions

Help/release/dev/genexp-no-eval.rst

@@ -0,0 +1,5 @@
+genexp-no-eval
+--------------
+
+* :manual:`generator expressions <cmake-generator-expressions(7)>`
+  short-circuit to avoid unnecessary evaluation of parameters.