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scripts/Kbuild.include
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# SPDX-License-Identifier: GPL-2.0 |
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#### # kbuild: Generic definitions |
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# Convenient variables |
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comma := , |
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quote := " |
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squote := ' |
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empty := space := $(empty) $(empty) |
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space_escape := _-_SPACE_-_ |
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pound := \# |
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### |
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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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# real prerequisites without phony targets real-prereqs = $(filter-out $(PHONY), $^) ### |
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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: |
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# # filechk_sample = echo $(KERNELRELEASE) # version.h: FORCE |
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# $(call filechk,sample) |
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# |
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# The rule defined shall write to stdout the content of the new file. # The existing file will be compared with the new one. # - If no file exist it is created # - If the content differ the new file is used # - If they are equal no change, and no timestamp update # - stdin is piped in from the first prerequisite ($<) so one has # to specify a valid file as first prerequisite (often the kbuild file) define filechk |
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$(Q)set -e; \ mkdir -p $(dir $@); \ trap "rm -f $(dot-target).tmp" EXIT; \ { $(filechk_$(1)); } > $(dot-target).tmp; \ if [ ! -r $@ ] || ! cmp -s $@ $(dot-target).tmp; then \ $(kecho) ' UPD $@'; \ mv -f $(dot-target).tmp $@; \ |
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fi endef |
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###### |
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# gcc support functions |
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# See documentation in Documentation/kbuild/makefiles.rst |
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# cc-cross-prefix # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) |
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# Return first <prefix> where a <prefix>gcc is found in PATH. # If no gcc found in PATH with listed prefixes return nothing |
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# # Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it # would try to directly execute the shell builtin 'command'. This workaround # should be kept for a long time since this issue was fixed only after the # GNU Make 4.2.1 release. |
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cc-cross-prefix = $(firstword $(foreach c, $(1), \ $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c)))) |
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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 "$$TMP",option-ok,otherwise) |
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# Exit code chooses option. "$$TMP" serves as a temporary file and is # automatically cleaned up. |
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try-run = $(shell set -e; \ |
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TMP="$(TMPOUT).$$$$.tmp"; \ |
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TMPO="$(TMPOUT).$$$$.o"; \ |
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if ($(1)) >/dev/null 2>&1; \ then echo "$(2)"; \ else echo "$(3)"; \ fi; \ |
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rm -f "$$TMP" "$$TMPO") |
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# as-option |
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# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
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as-option = $(call try-run,\ |
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$(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$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 = $(call try-run,\ |
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printf "%b " "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) |
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# __cc-option # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586) |
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__cc-option = $(call try-run,\ |
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$(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4)) |
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# Do not attempt to build with gcc plugins during cc-option tests. # (And this uses delayed resolution so the flags will be up to date.) |
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CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS)) |
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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 __cc-option, $(CC),\ $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(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) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) |
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# cc-disable-warning # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) |
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cc-disable-warning = $(call try-run,\ |
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$(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) |
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# cc-ifversion # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) |
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cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4)) |
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# ld-option |
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# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y) ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3)) |
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# ld-version |
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# Note this is mainly for HJ Lu's 3 number binutil versions |
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ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh) |
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# ld-ifversion # Usage: $(call ld-ifversion, -ge, 22252, y) |
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ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4)) |
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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 |
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build := -f $(srctree)/scripts/Makefile.build obj |
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### # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj= # Usage: # $(Q)$(MAKE) $(modbuiltin)=dir |
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modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj |
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### # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj= # Usage: # $(Q)$(MAKE) $(dtbinst)=dir |
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dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj |
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### |
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# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj= # Usage: # $(Q)$(MAKE) $(clean)=dir clean := -f $(srctree)/scripts/Makefile.clean obj |
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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 = @set -e; $(echo-cmd) $(cmd_$(1)) |
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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 |
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# See Documentation/kbuild/makefiles.rst for more info |
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ifneq ($(KBUILD_NOCMDDEP),1) |
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# Check if both commands are the same including their order. Result is empty |
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# string if equal. User may override this check using make KBUILD_NOCMDDEP=1 |
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cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \ |
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$(subst $(space),$(space_escape),$(strip $(cmd_$1)))) |
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else |
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cmd-check = $(if $(strip $(cmd_$@)),,1) |
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endif |
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# Replace >$< with >$$< to preserve $ when reloading the .cmd file # (needed for make) |
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# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file |
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# (needed for make) # Replace >'< with >'\''< to be able to enclose the whole string in '...' # (needed for the shell) |
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make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(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. |
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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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if_changed = $(if $(any-prereq)$(cmd-check), \ |
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$(cmd); \ |
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printf '%s ' '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 $(any-prereq)$(cmd-check),$(cmd_and_fixdep),@:) |
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cmd_and_fixdep = \ |
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$(cmd); \ |
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scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\ |
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rm -f $(depfile) |
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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 $(any-prereq)$(cmd-check),$(rule_$(1)),@:) |
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### |
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# why - tell why a target got built |
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# 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 $@), \ |
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$(if $(any-prereq),- due to: $(any-prereq), \ |
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$(if $(cmd-check), \ |
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$(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 |
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############################################################################### # # When a Kconfig string contains a filename, it is suitable for # passing to shell commands. It is surrounded by double-quotes, and # any double-quotes or backslashes within it are escaped by # backslashes. # # This is no use for dependencies or $(wildcard). We need to strip the # surrounding quotes and the escaping from quotes and backslashes, and # we *do* need to escape any spaces in the string. So, for example: # # Usage: $(eval $(call config_filename,FOO)) # # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option, # transformed as described above to be suitable for use within the # makefile. # # Also, if the filename is a relative filename and exists in the source # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to # be prefixed to *both* command invocation and dependencies. # # Note: We also print the filenames in the quiet_cmd_foo text, and # perhaps ought to have a version specially escaped for that purpose. # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good # enough. It'll strip the quotes in the common case where there's no # space and it's a simple filename, and it'll retain the quotes when # there's a space. There are some esoteric cases in which it'll print # the wrong thing, but we don't really care. The actual dependencies # and commands *do* get it right, with various combinations of single # and double quotes, backslashes and spaces in the filenames. # ############################################################################### # |
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define config_filename ifneq ($$(CONFIG_$(1)),"") $(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1))))))) ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME))) else ifeq ($$(wildcard $$($(1)_FILENAME)),) ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),) $(1)_SRCPREFIX := $(srctree)/ endif endif endif endif endef # ############################################################################### |
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# delete partially updated (i.e. corrupted) files on error .DELETE_ON_ERROR: |
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# do not delete intermediate files automatically .SECONDARY: |