61 lines
1.7 KiB
Makefile
61 lines
1.7 KiB
Makefile
# $NetBSD: impsrc.mk,v 1.3 2020/08/07 13:43:50 rillig Exp $
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# Does ${.IMPSRC} work properly?
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# It should be set, in order of precedence, to ${.TARGET} of:
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# 1) the implied source of a transformation rule,
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# 2) the first prerequisite from the dependency line of an explicit rule, or
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# 3) the first prerequisite of an explicit rule.
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#
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# Items 2 and 3 work in GNU make.
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# Items 2 and 3 are not required by POSIX 2018.
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all: target1.z target2 target3 target4
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.SUFFIXES: .x .y .z
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.x.y: source1
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@echo 'expected: target1.x'
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@echo 'actual: $<'
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.y.z: source2
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@echo 'expected: target1.y'
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@echo 'actual: $<'
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# (3) Making target1.z out of target1.y is done because of an inference rule.
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# Therefore $< is available here.
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# (2) This is an additional dependency on the inference rule .x.y.
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# The dependency target1.x comes from the inference rule,
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# therefore it is available as $<.
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target1.y: source3
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# (1) This is an explicit dependency, not an inference rule.
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# Therefore POSIX does not specify that $< be available here.
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target1.x: source4
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@echo 'expected: ' # either 'source4' or ''
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@echo 'actual: $<'
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# (4) This is an explicit dependency, independent of any inference rule.
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# Therefore $< is not available here.
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target2: source1 source2
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@echo 'expected: '
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@echo 'actual: $<'
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# (5) These are two explicit dependency rules.
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# The first doesn't have any dependencies, only the second has.
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# If any, the value of $< would be 'source2'.
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target3: source1
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target3: source2 source3
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@echo 'expected: '
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@echo 'actual: $<'
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# (6) The explicit rule does not have associated commands.
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# The value of $< might come from that rule,
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# but it's equally fine to leave $< undefined.
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target4: source1
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target4:
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@echo 'expected: '
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@echo 'actual: $<'
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source1 source2 source3 source4:
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