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scripts/Kbuild.include
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#### # kbuild: Generic definitions |
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# Convenient variables |
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comma := , |
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squote := ' |
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empty := space := $(empty) $(empty) ### |
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# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o dot-target = $(dir $@).$(notdir $@) ### |
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# The temporary file to save gcc -MD generated dependencies must not # contain a comma |
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depfile = $(subst $(comma),_,$(dot-target).d) |
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### |
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# filename of target with directory and extension stripped basetarget = $(basename $(notdir $@)) ### |
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# Escape single quote for use in echo statements escsq = $(subst $(squote),'\$(squote)',$1) ### |
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# Easy method for doing a status message kecho := : quiet_kecho := echo silent_kecho := : kecho := $($(quiet)kecho) ### |
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# filechk is used to check if the content of a generated file is updated. # Sample usage: # define filechk_sample # echo $KERNELRELEASE # endef # version.h : Makefile # $(call filechk,sample) # The rule defined shall write to stdout the content of the new file. # The existing file will be compared with the new one. # - If no file exist it is created # - If the content differ the new file is used # - If they are equal no change, and no timestamp update # - stdin is piped in from the first prerequisite ($<) so one has # to specify a valid file as first prerequisite (often the kbuild file) define filechk $(Q)set -e; \ |
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$(kecho) ' CHK $@'; \ |
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mkdir -p $(dir $@); \ $(filechk_$(1)) < $< > $@.tmp; \ if [ -r $@ ] && cmp -s $@ $@.tmp; then \ rm -f $@.tmp; \ else \ |
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$(kecho) ' UPD $@'; \ |
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mv -f $@.tmp $@; \ fi endef |
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###### |
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# gcc support functions |
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# See documentation in Documentation/kbuild/makefiles.txt |
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# cc-cross-prefix # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) # Return first prefix where a prefix$(CC) is found in PATH. # If no $(CC) found in PATH with listed prefixes return nothing cc-cross-prefix = \ $(word 1, $(foreach c,$(1), \ $(shell set -e; \ if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \ echo $(c); \ fi))) |
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# output directory for tests below TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/) # try-run # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) # Exit code chooses option. "$$TMP" is can be used as temporary file and # is automatically cleaned up. try-run = $(shell set -e; \ TMP="$(TMPOUT).$$$$.tmp"; \ if ($(1)) >/dev/null 2>&1; \ then echo "$(2)"; \ else echo "$(3)"; \ fi; \ rm -f "$$TMP") |
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# as-option |
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# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
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as-option = $(call try-run,\ |
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$(CC) $(KBUILD_CFLAGS) $(1) -c -xassembler /dev/null -o "$$TMP",$(1),$(2)) |
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# as-instr |
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# Usage: cflags-y += $(call as-instr,instr,option1,option2) |
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as-instr = $(call try-run,\ |
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echo -e "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3)) |
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# cc-option |
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# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) |
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cc-option = $(call try-run,\ |
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$(CC) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",$(1),$(2)) |
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# cc-option-yn |
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# Usage: flag := $(call cc-option-yn,-march=winchip-c6) |
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cc-option-yn = $(call try-run,\ |
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$(CC) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n) |
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# cc-option-align # Prefix align with either -falign or -malign cc-option-align = $(subst -functions=0,,\ |
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$(call cc-option,-falign-functions=0,-malign-functions=0)) |
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# cc-version |
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# Usage gcc-ver := $(call cc-version) |
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cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) |
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# cc-fullversion # Usage gcc-ver := $(call cc-fullversion) cc-fullversion = $(shell $(CONFIG_SHELL) \ $(srctree)/scripts/gcc-version.sh -p $(CC)) |
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# cc-ifversion # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) |
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cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3)) |
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# ld-option # Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both) |
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ld-option = $(call try-run,\ $(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2)) |
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###### |
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### |
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# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= # Usage: # $(Q)$(MAKE) $(build)=dir build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj |
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# Prefix -I with $(srctree) if it is not an absolute path. |
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# skip if -I has no parameter addtree = $(if $(patsubst -I%,%,$(1)), \ $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)) |
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# Find all -I options and call addtree |
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flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) |
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# echo command. # 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)))$(echo-why)';) # printing commands |
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cmd = @$(echo-cmd) $(cmd_$(1)) |
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# Add $(obj)/ for paths that are not absolute |
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objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) |
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### |
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# if_changed - execute command if any prerequisite is newer than |
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# target, or command line has changed # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies # including used config symbols # if_changed_rule - as if_changed but execute rule instead # See Documentation/kbuild/makefiles.txt for more info ifneq ($(KBUILD_NOCMDDEP),1) |
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# Check if both arguments has same arguments. Result is empty string if equal. |
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# User may override this check using make KBUILD_NOCMDDEP=1 |
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arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ $(filter-out $(cmd_$@), $(cmd_$(1))) ) |
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endif |
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# >'< substitution is for echo to work, # >$< substitution to preserve $ when reloading .cmd file # note: when using inline perl scripts [perl -e '...$$t=1;...'] # in $(cmd_xxx) double $$ your perl vars |
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make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))) |
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# Find any prerequisites that is newer than target or that does not exist. # PHONY targets skipped in both cases. any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) |
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# Execute command if command has changed or prerequisite(s) are updated. |
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# |
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if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ @set -e; \ $(echo-cmd) $(cmd_$(1)); \ echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) |
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# Execute the command and also postprocess generated .d dependencies file. |
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if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ @set -e; \ $(echo-cmd) $(cmd_$(1)); \ scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ rm -f $(depfile); \ mv -f $(dot-target).tmp $(dot-target).cmd) |
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# Usage: $(call if_changed_rule,foo) |
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# Will check if $(cmd_foo) or any of the prerequisites changed, # and if so will execute $(rule_foo). |
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if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ @set -e; \ $(rule_$(1))) |
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### # why - tell why a a target got build # enabled by make V=2 # Output (listed in the order they are checked): # (1) - due to target is PHONY # (2) - due to target missing # (3) - due to: file1.h file2.h # (4) - due to command line change # (5) - due to missing .cmd file # (6) - due to target not in $(targets) # (1) PHONY targets are always build # (2) No target, so we better build it # (3) Prerequisite is newer than target # (4) The command line stored in the file named dir/.target.cmd # differed from actual command line. This happens when compiler # options changes # (5) No dir/.target.cmd file (used to store command line) # (6) No dir/.target.cmd file and target not listed in $(targets) # This is a good hint that there is a bug in the kbuild file ifeq ($(KBUILD_VERBOSE),2) why = \ $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ $(if $(wildcard $@), \ $(if $(strip $(any-prereq)),- due to: $(any-prereq), \ $(if $(arg-check), \ $(if $(cmd_$@),- due to command line change, \ $(if $(filter $@, $(targets)), \ - due to missing .cmd file, \ - due to $(notdir $@) not in $$(targets) \ ) \ ) \ ) \ ), \ - due to target missing \ ) \ ) echo-why = $(call escsq, $(strip $(why))) endif |