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

   1 # Copyright 2017 Rene Rivera
   2 # Distributed under the Boost Software License, Version 1.0.
   3 # (See accompanying file LICENSE.txt or copy at
   4 # https://www.bfgroup.xyz/b2/LICENSE.txt)
   5
   6 import feature ;
   7
   8 #| tag::doc[]
   9
  10 [[bbv2.builtin.features.conditional]]`conditional`::
  11 Used to introduce indirect conditional requirements. The value should have the
  12 form:
  13 +
  14 ----
  15 @rulename
  16 ----
  17 +
  18 where _rulename_ should be a name of a rule with the following signature:
  19 +
  20 ----
  21 rule rulename ( properties * )
  22 ----
  23 +
  24 The rule will be called for each target with its properties and should return
  25 any additional properties. See also section <<Requirements>> for an example.
  26
  27 |# # end::doc[]
  28
  29 feature.feature conditional
  30     :
  31     : incidental free ;