| 1 | ####
|
|---|
| 2 | # kbuild: Generic definitions
|
|---|
| 3 |
|
|---|
| 4 | # Convinient variables
|
|---|
| 5 | comma := ,
|
|---|
| 6 | squote := '
|
|---|
| 7 | empty :=
|
|---|
| 8 | space := $(empty) $(empty)
|
|---|
| 9 |
|
|---|
| 10 | ###
|
|---|
| 11 | # The temporary file to save gcc -MD generated dependencies must not
|
|---|
| 12 | # contain a comma
|
|---|
| 13 | depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
|
|---|
| 14 |
|
|---|
| 15 | ###
|
|---|
| 16 | # Escape single quote for use in echo statements
|
|---|
| 17 | escsq = $(subst $(squote),'\$(squote)',$1)
|
|---|
| 18 |
|
|---|
| 19 | ###
|
|---|
| 20 | # filechk is used to check if the content of a generated file is updated.
|
|---|
| 21 | # Sample usage:
|
|---|
| 22 | # define filechk_sample
|
|---|
| 23 | # echo $KERNELRELEASE
|
|---|
| 24 | # endef
|
|---|
| 25 | # version.h : Makefile
|
|---|
| 26 | # $(call filechk,sample)
|
|---|
| 27 | # The rule defined shall write to stdout the content of the new file.
|
|---|
| 28 | # The existing file will be compared with the new one.
|
|---|
| 29 | # - If no file exist it is created
|
|---|
| 30 | # - If the content differ the new file is used
|
|---|
| 31 | # - If they are equal no change, and no timestamp update
|
|---|
| 32 | # - stdin is piped in from the first prerequisite ($<) so one has
|
|---|
| 33 | # to specify a valid file as first prerequisite (often the kbuild file)
|
|---|
| 34 | define filechk
|
|---|
| 35 | $(Q)set -e; \
|
|---|
| 36 | echo ' CHK $@'; \
|
|---|
| 37 | mkdir -p $(dir $@); \
|
|---|
| 38 | $(filechk_$(1)) < $< > $@.tmp; \
|
|---|
| 39 | if [ -r $@ ] && cmp -s $@ $@.tmp; then \
|
|---|
| 40 | rm -f $@.tmp; \
|
|---|
| 41 | else \
|
|---|
| 42 | echo ' UPD $@'; \
|
|---|
| 43 | mv -f $@.tmp $@; \
|
|---|
| 44 | fi
|
|---|
| 45 | endef
|
|---|
| 46 |
|
|---|
| 47 | ######
|
|---|
| 48 | # gcc support functions
|
|---|
| 49 | # See documentation in Documentation/kbuild/makefiles.txt
|
|---|
| 50 |
|
|---|
| 51 | # as-option
|
|---|
| 52 | # Usage: cflags-y += $(call as-option, -Wa$(comma)-isa=foo,)
|
|---|
| 53 |
|
|---|
| 54 | as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \
|
|---|
| 55 | -xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \
|
|---|
| 56 | else echo "$(2)"; fi ;)
|
|---|
| 57 |
|
|---|
| 58 | # cc-option
|
|---|
| 59 | # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
|
|---|
| 60 |
|
|---|
| 61 | cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
|
|---|
| 62 | > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
|
|---|
| 63 |
|
|---|
| 64 | # hostcc-option
|
|---|
| 65 | # Usage: hostcflags-y += $(call hostcc-option, -march=winchip-c6, -march=i586)
|
|---|
| 66 |
|
|---|
| 67 | hostcc-option = $(shell if $(HOSTCC) $(HOSTCFLAGS) $(1) -S -o /dev/null -xc /dev/null \
|
|---|
| 68 | > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
|
|---|
| 69 |
|
|---|
| 70 | # cc-option-yn
|
|---|
| 71 | # Usage: flag := $(call cc-option-yn, -march=winchip-c6)
|
|---|
| 72 | cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
|
|---|
| 73 | > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
|
|---|
| 74 |
|
|---|
| 75 | # cc-option-align
|
|---|
| 76 | # Prefix align with either -falign or -malign
|
|---|
| 77 | cc-option-align = $(subst -functions=0,,\
|
|---|
| 78 | $(call cc-option,-falign-functions=0,-malign-functions=0))
|
|---|
| 79 |
|
|---|
| 80 | # cc-version
|
|---|
| 81 | # Usage gcc-ver := $(call cc-version, $(CC))
|
|---|
| 82 | cc-version = $(shell PATH="$(PATH)" $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
|
|---|
| 83 | $(if $(1), $(1), $(CC)))
|
|---|
| 84 |
|
|---|
| 85 | # cc-ifversion
|
|---|
| 86 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
|
|---|
| 87 | cc-ifversion = $(shell if [ $(call cc-version, $(CC)) $(1) $(2) ]; then \
|
|---|
| 88 | echo $(3); fi;)
|
|---|
| 89 |
|
|---|
| 90 | ###
|
|---|
| 91 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
|
|---|
| 92 | # Usage:
|
|---|
| 93 | # $(Q)$(MAKE) $(build)=dir
|
|---|
| 94 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
|
|---|
| 95 |
|
|---|
| 96 | # Prefix -I with $(srctree) if it is not an absolute path
|
|---|
| 97 | addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)
|
|---|
| 98 | # Find all -I options and call addtree
|
|---|
| 99 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
|
|---|
| 100 |
|
|---|
| 101 | # If quiet is set, only print short version of command
|
|---|
| 102 | cmd = @$(echo-cmd) $(cmd_$(1))
|
|---|
| 103 |
|
|---|
| 104 | # Add $(obj)/ for paths that is not absolute
|
|---|
| 105 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
|
|---|
| 106 |
|
|---|
| 107 | ###
|
|---|
| 108 | # if_changed - execute command if any prerequisite is newer than
|
|---|
| 109 | # target, or command line has changed
|
|---|
| 110 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
|
|---|
| 111 | # including used config symbols
|
|---|
| 112 | # if_changed_rule - as if_changed but execute rule instead
|
|---|
| 113 | # See Documentation/kbuild/makefiles.txt for more info
|
|---|
| 114 |
|
|---|
| 115 | ifneq ($(KBUILD_NOCMDDEP),1)
|
|---|
| 116 | # Check if both arguments has same arguments. Result in empty string if equal
|
|---|
| 117 | # User may override this check using make KBUILD_NOCMDDEP=1
|
|---|
| 118 | arg-check = $(strip $(filter-out $(1), $(2)) $(filter-out $(2), $(1)) )
|
|---|
| 119 | endif
|
|---|
| 120 |
|
|---|
| 121 | # echo command. Short version is $(quiet) equals quiet, otherwise full command
|
|---|
| 122 | echo-cmd = $(if $($(quiet)cmd_$(1)), \
|
|---|
| 123 | echo ' $(call escsq,$($(quiet)cmd_$(1)))';)
|
|---|
| 124 |
|
|---|
| 125 | make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))
|
|---|
| 126 |
|
|---|
| 127 | # function to only execute the passed command if necessary
|
|---|
| 128 | # >'< substitution is for echo to work, >$< substitution to preserve $ when reloading .cmd file
|
|---|
| 129 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] in $(cmd_xxx) double $$ your perl vars
|
|---|
| 130 | #
|
|---|
| 131 | if_changed = $(if $(strip $(filter-out $(PHONY),$?) \
|
|---|
| 132 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
|
|---|
| 133 | @set -e; \
|
|---|
| 134 | $(echo-cmd) $(cmd_$(1)); \
|
|---|
| 135 | echo 'cmd_$@ := $(make-cmd)' > $(@D)/.$(@F).cmd)
|
|---|
| 136 |
|
|---|
| 137 | # execute the command and also postprocess generated .d dependencies
|
|---|
| 138 | # file
|
|---|
| 139 | if_changed_dep = $(if $(strip $(filter-out $(PHONY),$?) \
|
|---|
| 140 | $(filter-out FORCE $(wildcard $^),$^) \
|
|---|
| 141 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
|
|---|
| 142 | @set -e; \
|
|---|
| 143 | $(echo-cmd) $(cmd_$(1)); \
|
|---|
| 144 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(@D)/.$(@F).tmp; \
|
|---|
| 145 | rm -f $(depfile); \
|
|---|
| 146 | mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
|
|---|
| 147 |
|
|---|
| 148 | # Usage: $(call if_changed_rule,foo)
|
|---|
| 149 | # will check if $(cmd_foo) changed, or any of the prequisites changed,
|
|---|
| 150 | # and if so will execute $(rule_foo)
|
|---|
| 151 | if_changed_rule = $(if $(strip $(filter-out $(PHONY),$?) \
|
|---|
| 152 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\
|
|---|
| 153 | @set -e; \
|
|---|
| 154 | $(rule_$(1)))
|
|---|
