87d9e3462d
This makes the build slightly more efficient by avoiding the need to re-stage packages on every full build run. It is also necessary for the upcoming CONFIG_AUTOREMOVE feature Signed-off-by: Felix Fietkau <nbd@nbd.name>
54 lines
1.4 KiB
Makefile
54 lines
1.4 KiB
Makefile
#
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# Copyright (C) 2007 OpenWrt.org
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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# define a dependency on a subtree
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# parameters:
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# 1: directories/files
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# 2: directory dependency
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# 3: tempfile for file listings
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# 4: find options
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DEP_FINDPARAMS := -x "*/.svn*" -x ".*" -x "*:*" -x "*\!*" -x "* *" -x "*\\\#*" -x "*/.*_check" -x "*/.*.swp" -x "*/.pkgdir"
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find_md5=find $(wildcard $(1)) -type f $(patsubst -x,-and -not -path,$(DEP_FINDPARAMS) $(2)) | mkhash md5
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define rdep
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.PRECIOUS: $(2)
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.SILENT: $(2)_check
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$(2): $(2)_check
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check-depends: $(2)_check
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ifneq ($(wildcard $(2)),)
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$(2)_check::
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$(if $(3), \
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$(call find_md5,$(1),$(4)) > $(3).1; \
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{ [ \! -f "$(3)" ] || diff $(3) $(3).1 >/dev/null; } && \
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) \
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{ \
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[ -f "$(2)_check.1" ] && mv "$(2)_check.1"; \
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$(TOPDIR)/scripts/timestamp.pl $(DEP_FINDPARAMS) $(4) -n $(2) $(1) && { \
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$(call debug_eval,$(SUBDIR),r,echo "No need to rebuild $(2)";) \
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touch -r "$(2)" "$(2)_check"; \
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} \
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} || { \
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$(call debug_eval,$(SUBDIR),r,echo "Need to rebuild $(2)";) \
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touch "$(2)_check"; \
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}
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$(if $(3), mv $(3).1 $(3))
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else
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$(2)_check::
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$(if $(3), rm -f $(3) $(3).1)
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$(call debug_eval,$(SUBDIR),r,echo "Target $(2) not built")
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endif
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endef
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ifeq ($(filter .%,$(MAKECMDGOALS)),$(if $(MAKECMDGOALS),$(MAKECMDGOALS),x))
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define rdep
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$(2): $(2)_check
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endef
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endif
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