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- # 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 -MMD 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
- 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 <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 below
- TMPOUT = $(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))
- # cc-option
- # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
- cc-option = $(call __cc-option, $(CC),\
- $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2))
- # cc-option-yn
- # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
- cc-option-yn = $(call try-run,\
- $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
- # cc-disable-warning
- # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
- cc-disable-warning = $(call try-run,\
- $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$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 versions
- ld-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)=dir
- build := -f $(srctree)/scripts/Makefile.build obj
- ###
- # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
- # Usage:
- # $(Q)$(MAKE) $(dtbinst)=dir
- dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj
- ###
- # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
- # Usage:
- # $(Q)$(MAKE) $(clean)=dir
- clean := -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)';)
- # sink stdout for 'make -s'
- redirect :=
- quiet_redirect :=
- silent_redirect := exec >/dev/null;
- # printing commands
- cmd = @set -e; $(echo-cmd) $($(quiet)redirect) $(cmd_$(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:
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