OpenCloudOS-Kernel/tools/build/Makefile

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Makefile
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tools build: Add fixdep dependency helper For dependency tracking we currently use targets that fall out of the gcc -MD command. We store this info in the .cmd file and include as makefile during the build. This format put object as target and all the c and header files as dependencies, like: util/abspath.o: util/abspath.c /usr/include/stdc-predef.h util/cache.h \ /usr/include/bits/wordsize.h /usr/include/gnu/stubs.h \ ... If any of those dependency header files (krava.h below) is removed the build fails on: make[1]: *** No rule to make target 'krava.h', needed by 'inc.o'. Stop. This patch adds fixdep helper, that is used by kbuild to alter the shape of the object dependencies like: source_util/abspath.o := util/abspath.c deps_util/abspath.o := \ /usr/include/stdc-predef.h \ util/cache.h \ ... util/abspath.o: $(deps_util/abspath.o) $(deps_util/abspath.o): With this format the header removal won't make the build fail, because it'll be picked up by the last empty target defined for each header. As previously mentioned the fixdep tool is taken from kbuild. It's not complete backport, only the part that alters the standard dependency info was taken, the part that adds the CONFIG_* dependency logic will be probably taken later on. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Kai Germaschewski <kai.germaschewski@gmx.de> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1443004442-32660-4-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-09-23 18:33:58 +08:00
ifeq ($(srctree),)
srctree := $(patsubst %/,%,$(dir $(shell pwd)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
endif
include $(srctree)/tools//scripts/Makefile.include
define allow-override
$(if $(or $(findstring environment,$(origin $(1))),\
$(findstring command line,$(origin $(1)))),,\
$(eval $(1) = $(2)))
endef
$(call allow-override,CC,$(CROSS_COMPILE)gcc)
$(call allow-override,LD,$(CROSS_COMPILE)ld)
ifeq ($(V),1)
Q =
else
Q = @
endif
export Q srctree CC LD
MAKEFLAGS := --no-print-directory
build := -f $(srctree)/tools/build/Makefile.build dir=. obj
all: fixdep
clean:
$(call QUIET_CLEAN, fixdep)
$(Q)find . -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
$(Q)rm -f fixdep
$(OUTPUT)fixdep-in.o: FORCE
$(Q)$(MAKE) $(build)=fixdep
$(OUTPUT)fixdep: $(OUTPUT)fixdep-in.o
$(QUIET_LINK)$(CC) $(LDFLAGS) -o $@ $<
FORCE:
.PHONY: FORCE