# SPDX-License-Identifier: GPL-2.0 #### # kbuild: Generic definitions # Convenient variables comma := , quote := " squote := ' empty := space := $(empty) $(empty) space_escape := _-_SPACE_-_ pound := \# ### # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o dot-target = $(dir $@).$(notdir $@) ### # The temporary file to save gcc -MD generated dependencies must not # contain a comma depfile = $(subst $(comma),_,$(dot-target).d) ### # filename of target with directory and extension stripped basetarget = $(basename $(notdir $@)) ### # real prerequisites without phony targets real-prereqs = $(filter-out $(PHONY), $^) ### # Escape single quote for use in echo statements escsq = $(subst $(squote),'\$(squote)',$1) ### # Quote a string to pass it to C files. foo => '"foo"' stringify = $(squote)$(quote)$1$(quote)$(squote) ### # Easy method for doing a status message kecho := : quiet_kecho := echo silent_kecho := : kecho := $($(quiet)kecho) ### # filechk is used to check if the content of a generated file is updated. # Sample usage: # # filechk_sample = echo $(KERNELRELEASE) # version.h: FORCE # $(call filechk,sample) # # The rule defined shall write to stdout the content of the new file. # The existing file will be compared with the new one. # - If no file exist it is created # - If the content differ the new file is used # - If they are equal no change, and no timestamp update # - stdin is piped in from the first prerequisite ($<) so one has # to specify a valid file as first prerequisite (often the kbuild file) define filechk $(Q)set -e; \ 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 $@; \ fi endef ###### # gcc support functions # See documentation in Documentation/kbuild/makefiles.rst # cc-cross-prefix # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) # Return first where a gcc is found in PATH. # If no gcc found in PATH with listed prefixes return nothing # # 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. cc-cross-prefix = $(firstword $(foreach c, $(1), \ $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c)))) # 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).$$$$.tmp"; \ TMPO="$(TMPOUT).$$$$.o"; \ if ($(1)) >/dev/null 2>&1; \ then echo "$(2)"; \ else echo "$(3)"; \ fi; \ rm -f "$$TMP" "$$TMPO") # as-option # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) as-option = $(call try-run,\ $(CC) $(KBUILD_CFLAGS) $(1) -c -xassembler /dev/null -o "$$TMP",$(1),$(2)) # as-instr # Usage: cflags-y += $(call as-instr,instr,option1,option2) as-instr = $(call try-run,\ /bin/echo -e "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3)) # cc-option # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) cc-option = $(call try-run,\ $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",$(1),$(2)) # cc-option-yn # Usage: flag := $(call cc-option-yn,-march=winchip-c6) cc-option-yn = $(call try-run,\ $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n) # cc-disable-warning # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) cc-disable-warning = $(call try-run,\ $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -xc /dev/null -o "$$TMP",-Wno-$(strip $(1))) # cc-version # Usage gcc-ver := $(call cc-version) cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) # cc-ifversion # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3)) # ld-option # Usage: KBUILD_LDFLAGS += $(call ld-option, -X) ld-option = $(call try-run,\ $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2)) ###### ### # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= # Usage: # $(Q)$(MAKE) $(build)=dir build := -f $(srctree)/scripts/Makefile.build obj ### # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj= # Usage: # $(Q)$(MAKE) $(clean)=dir clean := -f $(srctree)/scripts/Makefile.clean obj # Prefix -I with $(srctree) if it is not an absolute path. # skip if -I has no parameter addtree = $(if $(patsubst -I%,%,$(1)), \ $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1),$(1)) # Find all -I options and call addtree flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) # echo command. # Short version is used, if $(quiet) equals `quiet_', otherwise full one. echo-cmd = $(if $($(quiet)cmd_$(1)),\ echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) # printing commands cmd = @set -e; $(echo-cmd) $(cmd_$(1)) ### # if_changed - execute command if any prerequisite is newer than # target, or command line has changed # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies # including used config symbols # if_changed_rule - as if_changed but execute rule instead # See Documentation/kbuild/makefiles.rst for more info ifneq ($(KBUILD_NOCMDDEP),1) # Check if both commands are the same including their order. Result is empty # string if equal. User may override this check using make KBUILD_NOCMDDEP=1 cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \ $(subst $(space),$(space_escape),$(strip $(cmd_$1)))) else cmd-check = $(if $(strip $(cmd_$@)),,1) endif # Replace >$< with >$$< to preserve $ when reloading the .cmd file # (needed for make) # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file # (needed for make) # Replace >'< with >'\''< to be able to enclose the whole string in '...' # (needed for the shell) make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) # Find any prerequisites that are newer than target or that do not exist. # (This is not true for now; $? should contain any non-existent prerequisites, # but it does not work as expected when .SECONDARY is present. This seems a bug # of GNU Make.) # PHONY targets skipped in both cases. newer-prereqs = $(filter-out $(PHONY),$?) # Execute command if command has changed or prerequisite(s) are updated. if_changed = $(if $(newer-prereqs)$(cmd-check), \ $(cmd); \ printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) # Execute the command and also postprocess generated .d dependencies file. if_changed_dep = $(if $(newer-prereqs)$(cmd-check),$(cmd_and_fixdep),@:) cmd_and_fixdep = \ $(cmd); \ scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\ rm -f $(depfile) # Usage: $(call if_changed_rule,foo) # Will check if $(cmd_foo) or any of the prerequisites changed, # and if so will execute $(rule_foo). if_changed_rule = $(if $(newer-prereqs)$(cmd-check),$(rule_$(1)),@:) ### # why - tell why a target got built # 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 $(newer-prereqs),- due to: $(newer-prereqs), \ $(if $(cmd-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 ############################################################################### # # 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. # ############################################################################### # 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 # ############################################################################### # delete partially updated (i.e. corrupted) files on error .DELETE_ON_ERROR: # do not delete intermediate files automatically .SECONDARY: