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1b65f0bd2b
o allow env var MAKE_OBJDIR_CHECK_WRITABLE=no to skip writable checks in InitObjdir. Explicit .OBJDIR target always allows read-only directory. o Fix building and unit-tests on non-BSD. o More code cleanup and refactoring. o More unit tests
39 lines
1.2 KiB
Makefile
39 lines
1.2 KiB
Makefile
# $NetBSD: use-inference.mk,v 1.2 2020/11/05 00:41:04 rillig Exp $
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#
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# Demonstrate that .USE rules do not have an effect on inference rules.
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# At least not in the special case where the inference rule does not
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# have any associated commands.
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.SUFFIXES:
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.SUFFIXES: .from .to
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all: use-inference.to
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verbose: .USE
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@echo 'Verbosely making $@ out of $>'
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.from.to: verbose
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# Since this inference rule does not have any associated commands, it
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# is ignored.
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#
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# @echo 'Building $@ from $<'
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use-inference.from: # assume it exists
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@echo 'Building $@ from nothing'
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# Possible but unproven explanation:
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#
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# The main target is "all", which depends on "use-inference.to".
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# The inference connects the .from to the .to file, otherwise make
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# would not know that the .from file would need to be built.
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#
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# The .from file is then built.
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#
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# After this, make stops since it doesn't know how to make the .to file.
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# This is strange since make definitely knows about the .from.to suffix
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# inference rule. But it seems to ignore it, maybe because it doesn't
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# have any associated commands.
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# XXX: Despite the error message "don't know how to make", the exit status
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# is 0. This is inconsistent.
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