update source to Ceph Pacific 16.2.2

[ceph.git] / ceph / src / boost / tools / build / src / tools / features / conditional-feature.jam

diff --git a/ceph/src/boost/tools/build/src/tools/features/conditional-feature.jam b/ceph/src/boost/tools/build/src/tools/features/conditional-feature.jam
index 35c05ef264e17f792343dc53598eeccf868ee229..368ad232f29157df7fd6d2fe9eed90c50e18bba8 100644 (file)
--- a/ceph/src/boost/tools/build/src/tools/features/conditional-feature.jam
+++ b/ceph/src/boost/tools/build/src/tools/features/conditional-feature.jam
@@ -3,10 +3,29 @@
 # (See accompanying file LICENSE_1_0.txt or copy at
 # http://www.boost.org/LICENSE_1_0.txt)
 
-# TODO: Documentation.
-
 import feature ;
 
+#| tag::doc[]
+
+[[bbv2.builtin.features.conditional]]`conditional`::
+Used to introduce indirect conditional requirements. The value should have the
+form:
++
+----
+@rulename
+----
++
+where _rulename_ should be a name of a rule with the following signature:
++
+----
+rule rulename ( properties * )
+----
++
+The rule will be called for each target with its properties and should return
+any additional properties. See also section <<Requirements>> for an example.
+
+|# # end::doc[]
+
 feature.feature conditional
     :
     : incidental free ;