| # 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 <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))/) |
| |
| # 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).$$$$.tmp"; \ |
| TMPO="$(TMPOUT).$$$$.o"; \ |
| if ($(1)) >/dev/null 2>&1; \ |
| then echo "$(2)"; \ |
| else echo "$(3)"; \ |
| fi; \ |
| rm -f "$$TMP" "$$TMPO") |
| |
| # as-option |
| # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
| |
| as-option = $(call try-run,\ |
| $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$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 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)';) |
| |
| # 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: |
