9fb81323eb
Making the fixdep helper to be invoked within dep-cmd. Each user of the build framework needs to make sure fixdep exists before executing the build itself. If the build doesn't find fixdep, it falls back to the old style dependency tracking. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1443004442-32660-6-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
92 lines
3.5 KiB
Text
92 lines
3.5 KiB
Text
###
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# build: Generic definitions
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#
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# Lots of this code have been borrowed or heavily inspired from parts
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# of kbuild code, which is not credited, but mostly developed by:
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#
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# Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
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# Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
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#
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###
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# Convenient variables
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comma := ,
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squote := '
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###
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# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
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dot-target = $(dir $@).$(notdir $@)
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###
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# filename of target with directory and extension stripped
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basetarget = $(basename $(notdir $@))
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###
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# The temporary file to save gcc -MD generated dependencies must not
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# contain a comma
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depfile = $(subst $(comma),_,$(dot-target).d)
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###
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# Check if both arguments has same arguments. Result is empty string if equal.
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arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
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$(filter-out $(cmd_$@), $(cmd_$(1))) )
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###
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# Escape single quote for use in echo statements
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escsq = $(subst $(squote),'\$(squote)',$1)
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# Echo command
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# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
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echo-cmd = $(if $($(quiet)cmd_$(1)),\
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echo ' $(call escsq,$($(quiet)cmd_$(1)))';)
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###
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# Replace >$< with >$$< to preserve $ when reloading the .cmd file
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# (needed for make)
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# Replace >#< with >\#< to avoid starting a comment in the .cmd file
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# (needed for make)
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# Replace >'< with >'\''< to be able to enclose the whole string in '...'
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# (needed for the shell)
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make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
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###
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# Find any prerequisites that is newer than target or that does not exist.
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# PHONY targets skipped in both cases.
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any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
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###
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# Copy dependency data into .cmd file
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# - gcc -M dependency info
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# - command line to create object 'cmd_object :='
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dep-cmd = $(if $(wildcard $(fixdep)), \
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$(fixdep) $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp; \
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rm -f $(depfile); \
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mv -f $(dot-target).tmp $(dot-target).cmd, \
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printf '\# cannot find fixdep (%s)\n' $(fixdep) > $(dot-target).cmd; \
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printf '\# using basic dep data\n\n' >> $(dot-target).cmd; \
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cat $(depfile) >> $(dot-target).cmd; \
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printf '%s\n' 'cmd_$@ := $(make-cmd)' >> $(dot-target).cmd)
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###
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# if_changed_dep - execute command if any prerequisite is newer than
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# target, or command line has changed and update
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# dependencies in the cmd file
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if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)), \
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@set -e; \
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$(echo-cmd) $(cmd_$(1)) && $(dep-cmd))
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# if_changed - execute command if any prerequisite is newer than
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# target, or command line has changed
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if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
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@set -e; \
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$(echo-cmd) $(cmd_$(1)); \
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printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
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###
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# C flags to be used in rule definitions, includes:
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# - depfile generation
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# - global $(CFLAGS)
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# - per target C flags
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# - per object C flags
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# - BUILD_STR macro to allow '-D"$(variable)"' constructs
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c_flags = -Wp,-MD,$(depfile),-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj))
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