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depsrc-optional.mk revision 1.3 
      1 # $NetBSD: depsrc-optional.mk,v 1.3 2020/09/05 15:57:12 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 # TODO: Explain why the commands for "important" are not executed.
      9 # I had thought that only the "optional" commands were skipped.
     10 
     11 all: important
     12 	: ${.TARGET} is made.
     13 
     14 important: optional
     15 	: ${.TARGET} is made.
     16 
     17 optional: .OPTIONAL
     18 	: This is not executed.
     19