зеркало из https://github.com/mozilla/gecko-dev.git
32 строки
1.3 KiB
Makefile
32 строки
1.3 KiB
Makefile
# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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BACKEND_GENERATION_SCRIPT ?= config.status
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# A traditional rule would look like this:
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# backend.%:
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# @echo do stuff
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#
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# But with -j<n>, and multiple items in BUILD_BACKEND_FILES, the command would
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# run multiple times in parallel.
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#
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# "Fortunately", make has some weird semantics for pattern rules: if there are
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# multiple targets in a pattern rule and each of them is matched at most once,
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# the command will only run once. So:
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# backend%RecursiveMakeBackend backend%FasterMakeBackend:
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# @echo do stuff
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# backend: backend.RecursiveMakeBackend backend.FasterMakeBackend
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# would only execute the command once.
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#
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# Credit where due: http://stackoverflow.com/questions/2973445/gnu-makefile-rule-generating-a-few-targets-from-a-single-source-file/3077254#3077254
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$(subst .,%,$(BUILD_BACKEND_FILES)):
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@echo 'Build configuration changed. Regenerating backend.'
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$(PYTHON) $(BACKEND_GENERATION_SCRIPT)
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define build_backend_rule
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$(1): $$(wildcard $$(shell cat $(1).in))
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endef
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$(foreach file,$(BUILD_BACKEND_FILES),$(eval $(call build_backend_rule,$(file))))
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