# SPDX-License-Identifier: GPL-2.0##### kbuild: Generic definitions # Convenient variablescomma   := ,quote   := "squote  := 'empty   :=space   := $(empty) $(empty)space_escape := _-_SPACE_-_pound := \# #### Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.odot-target = $(dir $@).$(notdir $@) #### The temporary file to save gcc -MMD generated dependencies must not# contain a commadepfile = $(subst $(comma),_,$(dot-target).d) #### filename of target with directory and extension strippedbasetarget = $(basename $(notdir $@)) #### real prerequisites without phony targetsreal-prereqs = $(filter-out $(PHONY), $^) #### Escape single quote for use in echo statementsescsq = $(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 := echosilent_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 $@;			\	fiendef ####### 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 <prefix> where a <prefix>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 belowTMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$ # try-run# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)# Exit code chooses option. "$$TMP" serves as a temporary file and is# automatically cleaned up.try-run = $(shell set -e;		\	TMP=$(TMPOUT)/tmp;		\	TMPO=$(TMPOUT)/tmp.o;		\	mkdir -p $(TMPOUT);		\	trap "rm -rf $(TMPOUT)" EXIT;	\	if ($(1)) >/dev/null 2>&1;	\	then echo "$(2)";		\	else echo "$(3)";		\	fi) # as-option# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) as-option = $(call try-run,\	$(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2)) # as-instr# Usage: cflags-y += $(call as-instr,instr,option1,option2) as-instr = $(call try-run,\	printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) # __cc-option# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)__cc-option = $(call try-run,\	$(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4)) # 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.)CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS)) # cc-option# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) cc-option = $(call __cc-option, $(CC),\	$(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2)) # cc-option-yn# Usage: flag := $(call cc-option-yn,-march=winchip-c6)cc-option-yn = $(call try-run,\	$(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) # cc-disable-warning# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)cc-disable-warning = $(call try-run,\	$(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) # cc-ifversion# Usage:  EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4)) # ld-option# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3)) # ld-version# Note this is mainly for HJ Lu's 3 number binutil versionsld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh) # ld-ifversion# Usage:  $(call ld-ifversion, -ge, 22252, y)ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4)) ###### #### Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=# Usage:# $(Q)$(MAKE) $(build)=dirbuild := -f $(srctree)/scripts/Makefile.build obj #### Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=# Usage:# $(Q)$(MAKE) $(dtbinst)=dirdtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj #### Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=# Usage:# $(Q)$(MAKE) $(clean)=dirclean := -f $(srctree)/scripts/Makefile.clean obj # 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 commandscmd = @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=1cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \                         $(subst $(space),$(space_escape),$(strip $(cmd_$1))))elsecmd-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 fileifeq ($(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_filenameifneq ($$(CONFIG_$(1)),"")$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))elseifeq ($$(wildcard $$($(1)_FILENAME)),)ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)$(1)_SRCPREFIX := $(srctree)/endifendifendifendifendef################################################################################ # delete partially updated (i.e. corrupted) files on error.DELETE_ON_ERROR: # do not delete intermediate files automatically.SECONDARY: