| #### |
| # kbuild: Generic definitions |
| |
| # Convenient variables |
| comma := , |
| squote := ' |
| empty := |
| space := $(empty) $(empty) |
| |
| ### |
| # 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 $@)) |
| |
| ### |
| # filename of first prerequisite with directory and extension stripped |
| baseprereq = $(basename $(notdir $<)) |
| |
| ### |
| # Escape single quote for use in echo statements |
| escsq = $(subst $(squote),'\$(squote)',$1) |
| |
| ### |
| # 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: |
| # define filechk_sample |
| # echo $KERNELRELEASE |
| # endef |
| # version.h : Makefile |
| # $(call filechk,sample) |
| # The rule defined shall write to stdout the content of the new file. |
| # The existing file will be compared with the new one. |
| # - If no file exist it is created |
| # - If the content differ the new file is used |
| # - If they are equal no change, and no timestamp update |
| # - stdin is piped in from the first prerequisite ($<) so one has |
| # to specify a valid file as first prerequisite (often the kbuild file) |
| define filechk |
| $(Q)set -e; \ |
| $(kecho) ' CHK $@'; \ |
| mkdir -p $(dir $@); \ |
| $(filechk_$(1)) < $< > $@.tmp; \ |
| if [ -r $@ ] && cmp -s $@ $@.tmp; then \ |
| rm -f $@.tmp; \ |
| else \ |
| $(kecho) ' UPD $@'; \ |
| mv -f $@.tmp $@; \ |
| fi |
| endef |
| |
| ###### |
| # gcc support functions |
| # See documentation in Documentation/kbuild/makefiles.txt |
| |
| # cc-cross-prefix |
| # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) |
| # Return first prefix where a prefix$(CC) is found in PATH. |
| # If no $(CC) found in PATH with listed prefixes return nothing |
| cc-cross-prefix = \ |
| $(word 1, $(foreach c,$(1), \ |
| $(shell set -e; \ |
| if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \ |
| echo $(c); \ |
| fi))) |
| |
| # 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" "$$TMPO") |
| |
| # as-option |
| # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
| |
| as-option = $(call try-run,\ |
| $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$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 "$$TMP" -,$(2),$(3)) |
| |
| # cc-option |
| # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) |
| |
| cc-option = $(call try-run,\ |
| $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2)) |
| |
| # cc-option-yn |
| # Usage: flag := $(call cc-option-yn,-march=winchip-c6) |
| cc-option-yn = $(call try-run,\ |
| $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) |
| |
| # cc-option-align |
| # Prefix align with either -falign or -malign |
| cc-option-align = $(subst -functions=0,,\ |
| $(call cc-option,-falign-functions=0,-malign-functions=0)) |
| |
| # cc-disable-warning |
| # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) |
| cc-disable-warning = $(call try-run,\ |
| $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) |
| |
| # cc-version |
| # Usage gcc-ver := $(call cc-version) |
| cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) |
| |
| # cc-fullversion |
| # Usage gcc-ver := $(call cc-fullversion) |
| cc-fullversion = $(shell $(CONFIG_SHELL) \ |
| $(srctree)/scripts/gcc-version.sh -p $(CC)) |
| |
| # cc-ifversion |
| # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) |
| cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3)) |
| |
| # cc-ldoption |
| # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both) |
| cc-ldoption = $(call try-run,\ |
| $(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2)) |
| |
| # ld-option |
| # Usage: LDFLAGS += $(call ld-option, -X) |
| ld-option = $(call try-run,\ |
| $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2)) |
| |
| # ar-option |
| # Usage: KBUILD_ARFLAGS := $(call ar-option,D) |
| # Important: no spaces around options |
| ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2)) |
| |
| ###### |
| |
| ### |
| # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
| # Usage: |
| # $(Q)$(MAKE) $(build)=dir |
| build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj |
| |
| ### |
| # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj= |
| # Usage: |
| # $(Q)$(MAKE) $(modbuiltin)=dir |
| modbuiltin := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.modbuiltin 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)) |
| |
| # 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 = @$(echo-cmd) $(cmd_$(1)) |
| |
| # Add $(obj)/ for paths that are not absolute |
| objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) |
| |
| ### |
| # 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.txt for more info |
| |
| ifneq ($(KBUILD_NOCMDDEP),1) |
| # Check if both arguments has same arguments. Result is empty string if equal. |
| # User may override this check using make KBUILD_NOCMDDEP=1 |
| arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ |
| $(filter-out $(cmd_$@), $(cmd_$(1))) ) |
| else |
| arg-check = $(if $(strip $(cmd_$@)),,1) |
| endif |
| |
| # >'< substitution is for echo to work, |
| # >$< substitution to preserve $ when reloading .cmd file |
| # note: when using inline perl scripts [perl -e '...$$t=1;...'] |
| # in $(cmd_xxx) double $$ your perl vars |
| make-cmd = $(subst \\,\\\\,$(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))) |
| |
| # Find any prerequisites that is newer than target or that does not exist. |
| # PHONY targets skipped in both cases. |
| any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) |
| |
| # Execute command if command has changed or prerequisite(s) are updated. |
| # |
| if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
| @set -e; \ |
| $(echo-cmd) $(cmd_$(1)); \ |
| echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) |
| |
| # Execute the command and also postprocess generated .d dependencies file. |
| if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ |
| @set -e; \ |
| $(echo-cmd) $(cmd_$(1)); \ |
| scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ |
| rm -f $(depfile); \ |
| mv -f $(dot-target).tmp $(dot-target).cmd) |
| |
| # 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 $(strip $(any-prereq) $(arg-check) ), \ |
| @set -e; \ |
| $(rule_$(1))) |
| |
| ### |
| # why - tell why a a target got build |
| # 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 $(strip $(any-prereq)),- due to: $(any-prereq), \ |
| $(if $(arg-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 |
