[1765] | 1 | ####
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| 2 | # kbuild: Generic definitions
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| 3 |
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| 4 | # Convinient variables
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| 5 | comma := ,
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| 6 | squote := '
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| 7 | empty :=
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| 8 | space := $(empty) $(empty)
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| 9 |
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| 10 | ###
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| 11 | # The temporary file to save gcc -MD generated dependencies must not
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| 12 | # contain a comma
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| 13 | depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
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| 14 |
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| 15 | ###
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| 16 | # Escape single quote for use in echo statements
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| 17 | escsq = $(subst $(squote),'\$(squote)',$1)
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| 18 |
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| 19 | ###
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| 20 | # filechk is used to check if the content of a generated file is updated.
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| 21 | # Sample usage:
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| 22 | # define filechk_sample
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| 23 | # echo $KERNELRELEASE
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| 24 | # endef
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| 25 | # version.h : Makefile
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| 26 | # $(call filechk,sample)
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| 27 | # The rule defined shall write to stdout the content of the new file.
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| 28 | # The existing file will be compared with the new one.
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| 29 | # - If no file exist it is created
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| 30 | # - If the content differ the new file is used
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| 31 | # - If they are equal no change, and no timestamp update
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| 32 | # - stdin is piped in from the first prerequisite ($<) so one has
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| 33 | # to specify a valid file as first prerequisite (often the kbuild file)
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| 34 | define filechk
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| 35 | $(Q)set -e; \
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| 36 | echo ' CHK $@'; \
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| 37 | mkdir -p $(dir $@); \
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| 38 | $(filechk_$(1)) < $< > $@.tmp; \
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| 39 | if [ -r $@ ] && cmp -s $@ $@.tmp; then \
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| 40 | rm -f $@.tmp; \
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| 41 | else \
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| 42 | echo ' UPD $@'; \
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| 43 | mv -f $@.tmp $@; \
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| 44 | fi
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| 45 | endef
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| 46 |
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| 47 | ######
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| 48 | # gcc support functions
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| 49 | # See documentation in Documentation/kbuild/makefiles.txt
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| 50 |
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| 51 | # as-option
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| 52 | # Usage: cflags-y += $(call as-option, -Wa$(comma)-isa=foo,)
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| 53 |
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| 54 | as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \
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| 55 | -xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \
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| 56 | else echo "$(2)"; fi ;)
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| 57 |
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| 58 | # cc-option
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| 59 | # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
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| 60 |
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| 61 | cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
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| 62 | > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
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| 63 |
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| 64 | # hostcc-option
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| 65 | # Usage: hostcflags-y += $(call hostcc-option, -march=winchip-c6, -march=i586)
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| 66 |
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| 67 | hostcc-option = $(shell if $(HOSTCC) $(HOSTCFLAGS) $(1) -S -o /dev/null -xc /dev/null \
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| 68 | > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
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| 69 |
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| 70 | # cc-option-yn
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| 71 | # Usage: flag := $(call cc-option-yn, -march=winchip-c6)
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| 72 | cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
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| 73 | > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
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| 74 |
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| 75 | # cc-option-align
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| 76 | # Prefix align with either -falign or -malign
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| 77 | cc-option-align = $(subst -functions=0,,\
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| 78 | $(call cc-option,-falign-functions=0,-malign-functions=0))
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| 79 |
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| 80 | # cc-version
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| 81 | # Usage gcc-ver := $(call cc-version, $(CC))
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| 82 | cc-version = $(shell PATH="$(PATH)" $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
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| 83 | $(if $(1), $(1), $(CC)))
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| 84 |
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| 85 | # cc-ifversion
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| 86 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
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| 87 | cc-ifversion = $(shell if [ $(call cc-version, $(CC)) $(1) $(2) ]; then \
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| 88 | echo $(3); fi;)
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| 89 |
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| 90 | ###
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| 91 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
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| 92 | # Usage:
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| 93 | # $(Q)$(MAKE) $(build)=dir
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| 94 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
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| 95 |
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| 96 | # Prefix -I with $(srctree) if it is not an absolute path
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| 97 | addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)
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| 98 | # Find all -I options and call addtree
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| 99 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
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| 100 |
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| 101 | # If quiet is set, only print short version of command
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| 102 | cmd = @$(echo-cmd) $(cmd_$(1))
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| 103 |
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| 104 | # Add $(obj)/ for paths that is not absolute
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| 105 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
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| 106 |
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| 107 | ###
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| 108 | # if_changed - execute command if any prerequisite is newer than
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| 109 | # target, or command line has changed
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| 110 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
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| 111 | # including used config symbols
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| 112 | # if_changed_rule - as if_changed but execute rule instead
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| 113 | # See Documentation/kbuild/makefiles.txt for more info
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| 114 |
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| 115 | ifneq ($(KBUILD_NOCMDDEP),1)
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| 116 | # Check if both arguments has same arguments. Result in empty string if equal
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| 117 | # User may override this check using make KBUILD_NOCMDDEP=1
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| 118 | arg-check = $(strip $(filter-out $(1), $(2)) $(filter-out $(2), $(1)) )
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| 119 | endif
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| 120 |
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| 121 | # echo command. Short version is $(quiet) equals quiet, otherwise full command
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| 122 | echo-cmd = $(if $($(quiet)cmd_$(1)), \
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| 123 | echo ' $(call escsq,$($(quiet)cmd_$(1)))';)
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| 124 |
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| 125 | make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))
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| 126 |
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| 127 | # function to only execute the passed command if necessary
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| 128 | # >'< substitution is for echo to work, >$< substitution to preserve $ when reloading .cmd file
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| 129 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] in $(cmd_xxx) double $$ your perl vars
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| 130 | #
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| 131 | if_changed = $(if $(strip $(filter-out $(PHONY),$?) \
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| 132 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
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| 133 | @set -e; \
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| 134 | $(echo-cmd) $(cmd_$(1)); \
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| 135 | echo 'cmd_$@ := $(make-cmd)' > $(@D)/.$(@F).cmd)
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| 136 |
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| 137 | # execute the command and also postprocess generated .d dependencies
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| 138 | # file
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| 139 | if_changed_dep = $(if $(strip $(filter-out $(PHONY),$?) \
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| 140 | $(filter-out FORCE $(wildcard $^),$^) \
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| 141 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
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| 142 | @set -e; \
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| 143 | $(echo-cmd) $(cmd_$(1)); \
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| 144 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(@D)/.$(@F).tmp; \
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| 145 | rm -f $(depfile); \
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| 146 | mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
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| 147 |
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| 148 | # Usage: $(call if_changed_rule,foo)
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| 149 | # will check if $(cmd_foo) changed, or any of the prequisites changed,
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| 150 | # and if so will execute $(rule_foo)
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| 151 | if_changed_rule = $(if $(strip $(filter-out $(PHONY),$?) \
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| 152 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\
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| 153 | @set -e; \
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| 154 | $(rule_$(1)))
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