80 lines
2.3 KiB
Makefile
80 lines
2.3 KiB
Makefile
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######################################################################
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# Makefile
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#
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# This makefile is the one called by user, but it's only a trampoline
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# to create the build directory and call the real Makefile.build
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#
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# make can be invoqued with 'make build=<your_build_directory> ...'
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# all other options and target are passed to the real makefile.
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#
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# As an exception to the rule of not modifying source directory, a
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# .build.mak file is created to cache the configured build directory.
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# Subsequent invocations of make could be done without passing
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# 'build=...' parameter.
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#
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# distclean target is catched to destroy both the .build.mak and
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# the whole build directory.
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#
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######################################################################
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# build directory is cached in BUILD_MAK file between make invocations
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BUILD_MAK = .build.mak
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ifneq ($(wildcard $(BUILD_MAK)),)
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include $(BUILD_MAK)
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endif
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# default build directory 'build'
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build ?= build
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# ($call quiet-command,CMD,MSG)
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# execute CMD and display MSG
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# if verbose mode is enabled (with 'make V=1`) print full CMD instead of MSG
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quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))
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# if the target is distclean, skip allmost rules
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# to doing anything which will be immediately
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# deleted after
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ifeq ($(filter distclean,$(MAKECMDGOALS)),)
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# default target (when one invokes 'make' without target)
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# so we have a non-empty target which could be catched by
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# the catch-all target below.
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default-all:
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# The catch-all target, which pass build to the main
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# makefile in the build directory.
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# strip-out 'default-all' for targets' list
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%: | $(build)
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$(call quiet-command, \
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$(MAKE) -C $(build) $(filter-out default-all,$@) \
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, "MAKE $(filter-out default-all,$@)")
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# Creates the buld directory
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# and populates it with a link to the build makefile
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$(build): | $(BUILD_MAK)
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$(call quiet-command,\
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mkdir -p $@; \
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ln -sf $(CURDIR)/Makefile.build $@/Makefile \
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, "MKBUILD $@")
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# always create BUILD_MAK to cache build configuration
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# but don't update it if not changed
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$(BUILD_MAK): FORCE
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@echo build=$(build) > $@.tmp
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@cmp -s $@.tmp $@ || (mv $@.tmp $@ && echo "GEN $@")
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@rm -f $@.tmp
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else # if distclean
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distclean:
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$(call quiet-command, rm -rf $(build) $(BUILD_MAK), "DISTCLEAN $(build)")
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endif # distclean
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.PHONY: distclean FORCE
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#ifndef V
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#.SILENT:
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#endif
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