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directive-ifmake.mk revision 1.5 
      1  1.5  rillig # $NetBSD: directive-ifmake.mk,v 1.5 2020/11/06 20:29:35 rillig Exp $
      2  1.1  rillig #
      3  1.3  rillig # Tests for the .ifmake directive, which provides a shortcut for asking
      4  1.3  rillig # whether a certain target is requested to be made from the command line.
      5  1.1  rillig 
      6  1.3  rillig # This is the most basic form.
      7  1.3  rillig .ifmake first
      8  1.5  rillig .  info ok: positive condition works
      9  1.3  rillig .else
     10  1.5  rillig .  warning positive condition fails
     11  1.3  rillig .endif
     12  1.1  rillig 
     13  1.3  rillig # The not operator works as expected.
     14  1.3  rillig # An alternative interpretation were that this condition is asking whether
     15  1.3  rillig # the target "!first" was requested.  To distinguish this, see the next test.
     16  1.3  rillig .ifmake !first
     17  1.5  rillig .  warning unexpected
     18  1.3  rillig .else
     19  1.5  rillig .  info ok: negation works
     20  1.3  rillig .endif
     21  1.3  rillig 
     22  1.3  rillig # See if the exclamation mark really means "not", or if it is just part of
     23  1.3  rillig # the target name.
     24  1.3  rillig .ifmake !!first
     25  1.5  rillig .  info ok: double negation works
     26  1.3  rillig .else
     27  1.5  rillig .  warning double negation fails
     28  1.3  rillig .endif
     29  1.3  rillig 
     30  1.3  rillig # Multiple targets can be combined using the && and || operators.
     31  1.3  rillig .ifmake first && second
     32  1.5  rillig .  info ok: both mentioned
     33  1.3  rillig .else
     34  1.5  rillig .  warning && does not work as expected
     35  1.3  rillig .endif
     36  1.3  rillig 
     37  1.3  rillig # Negation also works in complex conditions.
     38  1.3  rillig .ifmake first && !unmentioned
     39  1.5  rillig .  info ok: only those mentioned
     40  1.3  rillig .else
     41  1.5  rillig .  warning && with ! does not work as expected
     42  1.3  rillig .endif
     43  1.3  rillig 
     44  1.4  rillig # Using the .MAKEFLAGS special dependency target, arbitrary command
     45  1.4  rillig # line options can be added at parse time.  This means that it is
     46  1.4  rillig # possible to extend the targets to be made.
     47  1.4  rillig .MAKEFLAGS: late-target
     48  1.4  rillig .ifmake late-target
     49  1.5  rillig .  info Targets can even be added at parse time.
     50  1.4  rillig .else
     51  1.5  rillig .  info No, targets cannot be added at parse time anymore.
     52  1.4  rillig .endif
     53  1.4  rillig 
     54  1.4  rillig first second unmentioned late-target:
     55  1.3  rillig 	: $@
     56