Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>master
Masahiro Yamada
11 years ago
committed by
Tom Rini
parent
34bd050709
commit
ceec4c8746
@ -0,0 +1,278 @@ |
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#### |
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# kbuild: Generic definitions |
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# Convenient variables |
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comma := , |
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squote := ' |
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empty := |
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space := $(empty) $(empty) |
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### |
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# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o |
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dot-target = $(dir $@).$(notdir $@) |
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### |
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# The temporary file to save gcc -MD generated dependencies must not |
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# contain a comma |
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depfile = $(subst $(comma),_,$(dot-target).d) |
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### |
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# filename of target with directory and extension stripped |
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basetarget = $(basename $(notdir $@)) |
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### |
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# filename of first prerequisite with directory and extension stripped |
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baseprereq = $(basename $(notdir $<)) |
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### |
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# Escape single quote for use in echo statements |
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escsq = $(subst $(squote),'\$(squote)',$1) |
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### |
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# Easy method for doing a status message |
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kecho := : |
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quiet_kecho := echo |
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silent_kecho := : |
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kecho := $($(quiet)kecho) |
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### |
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# filechk is used to check if the content of a generated file is updated. |
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# Sample usage: |
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# define filechk_sample |
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# echo $KERNELRELEASE |
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# endef |
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# version.h : Makefile |
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# $(call filechk,sample) |
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# The rule defined shall write to stdout the content of the new file. |
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# The existing file will be compared with the new one. |
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# - If no file exist it is created |
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# - If the content differ the new file is used |
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# - If they are equal no change, and no timestamp update |
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# - stdin is piped in from the first prerequisite ($<) so one has |
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# to specify a valid file as first prerequisite (often the kbuild file) |
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define filechk |
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$(Q)set -e; \ |
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$(kecho) ' CHK $@'; \ |
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mkdir -p $(dir $@); \ |
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$(filechk_$(1)) < $< > $@.tmp; \ |
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if [ -r $@ ] && cmp -s $@ $@.tmp; then \ |
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rm -f $@.tmp; \ |
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else \ |
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$(kecho) ' UPD $@'; \ |
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mv -f $@.tmp $@; \ |
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fi |
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endef |
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###### |
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# gcc support functions |
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# See documentation in Documentation/kbuild/makefiles.txt |
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# cc-cross-prefix |
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# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) |
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# Return first prefix where a prefix$(CC) is found in PATH. |
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# If no $(CC) found in PATH with listed prefixes return nothing |
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cc-cross-prefix = \ |
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$(word 1, $(foreach c,$(1), \ |
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$(shell set -e; \ |
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if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \ |
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echo $(c); \ |
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fi))) |
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# output directory for tests below |
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TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/) |
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# try-run |
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# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) |
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# Exit code chooses option. "$$TMP" is can be used as temporary file and |
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# is automatically cleaned up. |
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try-run = $(shell set -e; \ |
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TMP="$(TMPOUT).$$$$.tmp"; \ |
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TMPO="$(TMPOUT).$$$$.o"; \ |
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if ($(1)) >/dev/null 2>&1; \ |
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then echo "$(2)"; \ |
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else echo "$(3)"; \ |
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fi; \ |
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rm -f "$$TMP" "$$TMPO") |
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# as-option |
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# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
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as-option = $(call try-run,\ |
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$(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2)) |
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# as-instr |
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# Usage: cflags-y += $(call as-instr,instr,option1,option2) |
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as-instr = $(call try-run,\ |
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printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) |
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# cc-option |
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# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) |
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cc-option = $(call try-run,\ |
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$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2)) |
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# cc-option-yn |
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# Usage: flag := $(call cc-option-yn,-march=winchip-c6) |
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cc-option-yn = $(call try-run,\ |
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$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) |
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# cc-option-align |
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# Prefix align with either -falign or -malign |
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cc-option-align = $(subst -functions=0,,\ |
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$(call cc-option,-falign-functions=0,-malign-functions=0)) |
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# cc-disable-warning |
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# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) |
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cc-disable-warning = $(call try-run,\ |
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$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) |
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# cc-version |
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# Usage gcc-ver := $(call cc-version) |
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cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) |
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# cc-fullversion |
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# Usage gcc-ver := $(call cc-fullversion) |
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cc-fullversion = $(shell $(CONFIG_SHELL) \ |
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$(srctree)/scripts/gcc-version.sh -p $(CC)) |
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# cc-ifversion |
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# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) |
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cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3)) |
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# cc-ldoption |
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# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both) |
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cc-ldoption = $(call try-run,\ |
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$(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2)) |
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# ld-option |
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# Usage: LDFLAGS += $(call ld-option, -X) |
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ld-option = $(call try-run,\ |
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$(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2)) |
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# ar-option |
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# Usage: KBUILD_ARFLAGS := $(call ar-option,D) |
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# Important: no spaces around options |
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ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2)) |
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###### |
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### |
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# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
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# Usage: |
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# $(Q)$(MAKE) $(build)=dir |
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build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj |
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### |
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# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj= |
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# Usage: |
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# $(Q)$(MAKE) $(modbuiltin)=dir |
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modbuiltin := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.modbuiltin obj |
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# Prefix -I with $(srctree) if it is not an absolute path. |
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# skip if -I has no parameter |
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addtree = $(if $(patsubst -I%,%,$(1)), \ |
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$(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)) |
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# Find all -I options and call addtree |
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flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) |
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# echo command. |
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# Short version is used, if $(quiet) equals `quiet_', otherwise full one. |
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echo-cmd = $(if $($(quiet)cmd_$(1)),\ |
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echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) |
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# printing commands |
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cmd = @$(echo-cmd) $(cmd_$(1)) |
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# Add $(obj)/ for paths that are not absolute |
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objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) |
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### |
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# if_changed - execute command if any prerequisite is newer than |
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# target, or command line has changed |
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# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies |
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# including used config symbols |
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# if_changed_rule - as if_changed but execute rule instead |
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# See Documentation/kbuild/makefiles.txt for more info |
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ifneq ($(KBUILD_NOCMDDEP),1) |
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# Check if both arguments has same arguments. Result is empty string if equal. |
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# User may override this check using make KBUILD_NOCMDDEP=1 |
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arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ |
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$(filter-out $(cmd_$@), $(cmd_$(1))) ) |
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else |
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arg-check = $(if $(strip $(cmd_$@)),,1) |
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endif |
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# >'< substitution is for echo to work, |
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# >$< substitution to preserve $ when reloading .cmd file |
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# note: when using inline perl scripts [perl -e '...$$t=1;...'] |
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# in $(cmd_xxx) double $$ your perl vars |
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make-cmd = $(subst \\,\\\\,$(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))) |
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# Find any prerequisites that is newer than target or that does not exist. |
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# PHONY targets skipped in both cases. |
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any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) |
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# Execute command if command has changed or prerequisite(s) are updated. |
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# |
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if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
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@set -e; \ |
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$(echo-cmd) $(cmd_$(1)); \ |
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echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) |
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# Execute the command and also postprocess generated .d dependencies file. |
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if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ |
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@set -e; \ |
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$(echo-cmd) $(cmd_$(1)); \ |
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scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ |
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rm -f $(depfile); \ |
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mv -f $(dot-target).tmp $(dot-target).cmd) |
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# Usage: $(call if_changed_rule,foo) |
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# Will check if $(cmd_foo) or any of the prerequisites changed, |
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# and if so will execute $(rule_foo). |
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if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ |
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@set -e; \ |
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$(rule_$(1))) |
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### |
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# why - tell why a a target got build |
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# enabled by make V=2 |
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# Output (listed in the order they are checked): |
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# (1) - due to target is PHONY |
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# (2) - due to target missing |
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# (3) - due to: file1.h file2.h |
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# (4) - due to command line change |
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# (5) - due to missing .cmd file |
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# (6) - due to target not in $(targets) |
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# (1) PHONY targets are always build |
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# (2) No target, so we better build it |
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# (3) Prerequisite is newer than target |
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# (4) The command line stored in the file named dir/.target.cmd |
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# differed from actual command line. This happens when compiler |
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# options changes |
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# (5) No dir/.target.cmd file (used to store command line) |
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# (6) No dir/.target.cmd file and target not listed in $(targets) |
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# This is a good hint that there is a bug in the kbuild file |
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ifeq ($(KBUILD_VERBOSE),2) |
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why = \ |
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$(if $(filter $@, $(PHONY)),- due to target is PHONY, \ |
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$(if $(wildcard $@), \ |
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$(if $(strip $(any-prereq)),- due to: $(any-prereq), \ |
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$(if $(arg-check), \ |
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$(if $(cmd_$@),- due to command line change, \ |
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$(if $(filter $@, $(targets)), \ |
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- due to missing .cmd file, \ |
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- due to $(notdir $@) not in $$(targets) \ |
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) \ |
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) \ |
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) \ |
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), \ |
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- due to target missing \ |
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) \ |
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) |
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echo-why = $(call escsq, $(strip $(why))) |
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endif |
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