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      1 # $NetBSD: depsrc-optional.mk,v 1.5 2020/11/08 10:33:47 rillig Exp $
      2 #
      3 # Tests for the special source .OPTIONAL in dependency declarations,
      4 # which ignores the target if make cannot find out how to create it.
      5 #
      6 # TODO: Describe practical use cases for this feature.
      7 
      8 all: important
      9 	: ${.TARGET} is made.
     10 
     11 important: optional optional-cohort
     12 	: ${.TARGET} is made.
     13 
     14 optional: .OPTIONAL
     15 	: An optional leaf node is not executed.
     16 
     17 # See IsOODateRegular.
     18 optional-cohort:: .OPTIONAL
     19 	: A leaf node using '::' is considered out-of-date.
     20 
     21 .MAKEFLAGS: -dm
     22