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      1 # $NetBSD: impsrc.mk,v 1.3 2020/08/07 13:43:50 rillig Exp $
      2 
      3 # Does ${.IMPSRC} work properly?
      4 # It should be set, in order of precedence, to ${.TARGET} of:
      5 #  1) the implied source of a transformation rule,
      6 #  2) the first prerequisite from the dependency line of an explicit rule, or
      7 #  3) the first prerequisite of an explicit rule.
      8 #
      9 # Items 2 and 3 work in GNU make.
     10 # Items 2 and 3 are not required by POSIX 2018.
     11 
     12 all: target1.z target2 target3 target4
     13 
     14 .SUFFIXES: .x .y .z
     15 
     16 .x.y: source1
     17 	@echo 'expected: target1.x'
     18 	@echo 'actual:   $<'
     19 
     20 .y.z: source2
     21 	@echo 'expected: target1.y'
     22 	@echo 'actual:   $<'
     23 
     24 # (3) Making target1.z out of target1.y is done because of an inference rule.
     25 # Therefore $< is available here.
     26 
     27 # (2) This is an additional dependency on the inference rule .x.y.
     28 # The dependency target1.x comes from the inference rule,
     29 # therefore it is available as $<.
     30 target1.y: source3
     31 
     32 # (1) This is an explicit dependency, not an inference rule.
     33 # Therefore POSIX does not specify that $< be available here.
     34 target1.x: source4
     35 	@echo 'expected: '		# either 'source4' or ''
     36 	@echo 'actual:   $<'
     37 
     38 # (4) This is an explicit dependency, independent of any inference rule.
     39 # Therefore $< is not available here.
     40 target2: source1 source2
     41 	@echo 'expected: '
     42 	@echo 'actual:   $<'
     43 
     44 # (5) These are two explicit dependency rules.
     45 # The first doesn't have any dependencies, only the second has.
     46 # If any, the value of $< would be 'source2'.
     47 target3: source1
     48 target3: source2 source3
     49 	@echo 'expected: '
     50 	@echo 'actual:   $<'
     51 
     52 # (6) The explicit rule does not have associated commands.
     53 # The value of $< might come from that rule,
     54 # but it's equally fine to leave $< undefined.
     55 target4: source1
     56 target4:
     57 	@echo 'expected: '
     58 	@echo 'actual:   $<'
     59 
     60 source1 source2 source3 source4:
     61