| | 1 | #### |
| | 2 | # kbuild: Generic definitions |
| | 3 | |
| | 4 | # Convenient variables |
| | 5 | comma := , |
| | 6 | squote := ' |
| | 7 | empty := |
| | 8 | space := $(empty) $(empty) |
| | 9 | |
| | 10 | ### |
| | 11 | # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o |
| | 12 | dot-target = $(dir $@).$(notdir $@) |
| | 13 | |
| | 14 | ### |
| | 15 | # The temporary file to save gcc -MD generated dependencies must not |
| | 16 | # contain a comma |
| | 17 | depfile = $(subst $(comma),_,$(dot-target).d) |
| | 18 | |
| | 19 | ### |
| | 20 | # filename of target with directory and extension stripped |
| | 21 | basetarget = $(basename $(notdir $@)) |
| | 22 | |
| | 23 | ### |
| | 24 | # Escape single quote for use in echo statements |
| | 25 | escsq = $(subst $(squote),'\$(squote)',$1) |
| | 26 | |
| | 27 | ### |
| | 28 | # Easy method for doing a status message |
| | 29 | kecho := : |
| | 30 | quiet_kecho := echo |
| | 31 | silent_kecho := : |
| | 32 | kecho := $($(quiet)kecho) |
| | 33 | |
| | 34 | ### |
| | 35 | # filechk is used to check if the content of a generated file is updated. |
| | 36 | # Sample usage: |
| | 37 | # define filechk_sample |
| | 38 | # echo $KERNELRELEASE |
| | 39 | # endef |
| | 40 | # version.h : Makefile |
| | 41 | # $(call filechk,sample) |
| | 42 | # The rule defined shall write to stdout the content of the new file. |
| | 43 | # The existing file will be compared with the new one. |
| | 44 | # - If no file exist it is created |
| | 45 | # - If the content differ the new file is used |
| | 46 | # - If they are equal no change, and no timestamp update |
| | 47 | # - stdin is piped in from the first prerequisite ($<) so one has |
| | 48 | # to specify a valid file as first prerequisite (often the kbuild file) |
| | 49 | define filechk |
| | 50 | $(Q)set -e; \ |
| | 51 | $(kecho) ' CHK $@'; \ |
| | 52 | mkdir -p $(dir $@); \ |
| | 53 | $(filechk_$(1)) < $< > $@.tmp; \ |
| | 54 | if [ -r $@ ] && cmp -s $@ $@.tmp; then \ |
| | 55 | rm -f $@.tmp; \ |
| | 56 | else \ |
| | 57 | $(kecho) ' UPD $@'; \ |
| | 58 | mv -f $@.tmp $@; \ |
| | 59 | fi |
| | 60 | endef |
| | 61 | |
| | 62 | ###### |
| | 63 | # gcc support functions |
| | 64 | # See documentation in Documentation/kbuild/makefiles.txt |
| | 65 | |
| | 66 | # cc-cross-prefix |
| | 67 | # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) |
| | 68 | # Return first prefix where a prefix$(CC) is found in PATH. |
| | 69 | # If no $(CC) found in PATH with listed prefixes return nothing |
| | 70 | cc-cross-prefix = \ |
| | 71 | $(word 1, $(foreach c,$(1), \ |
| | 72 | $(shell set -e; \ |
| | 73 | if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \ |
| | 74 | echo $(c); \ |
| | 75 | fi))) |
| | 76 | |
| | 77 | # output directory for tests below |
| | 78 | TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/) |
| | 79 | |
| | 80 | # try-run |
| | 81 | # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) |
| | 82 | # Exit code chooses option. "$$TMP" is can be used as temporary file and |
| | 83 | # is automatically cleaned up. |
| | 84 | try-run = $(shell set -e; \ |
| | 85 | TMP="$(TMPOUT).$$$$.tmp"; \ |
| | 86 | TMPO="$(TMPOUT).$$$$.o"; \ |
| | 87 | if ($(1)) >/dev/null 2>&1; \ |
| | 88 | then echo "$(2)"; \ |
| | 89 | else echo "$(3)"; \ |
| | 90 | fi; \ |
| | 91 | rm -f "$$TMP" "$$TMPO") |
| | 92 | |
| | 93 | # as-option |
| | 94 | # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
| | 95 | |
| | 96 | as-option = $(call try-run,\ |
| | 97 | $(CC) $(KBUILD_CFLAGS) $(1) -c -xassembler /dev/null -o "$$TMP",$(1),$(2)) |
| | 98 | |
| | 99 | # as-instr |
| | 100 | # Usage: cflags-y += $(call as-instr,instr,option1,option2) |
| | 101 | |
| | 102 | as-instr = $(call try-run,\ |
| | 103 | /bin/echo -e "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3)) |
| | 104 | |
| | 105 | # cc-option |
| | 106 | # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) |
| | 107 | |
| | 108 | cc-option = $(call try-run,\ |
| | 109 | $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",$(1),$(2)) |
| | 110 | |
| | 111 | # cc-option-yn |
| | 112 | # Usage: flag := $(call cc-option-yn,-march=winchip-c6) |
| | 113 | cc-option-yn = $(call try-run,\ |
| | 114 | $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n) |
| | 115 | |
| | 116 | # cc-option-align |
| | 117 | # Prefix align with either -falign or -malign |
| | 118 | cc-option-align = $(subst -functions=0,,\ |
| | 119 | $(call cc-option,-falign-functions=0,-malign-functions=0)) |
| | 120 | |
| | 121 | # cc-disable-warning |
| | 122 | # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) |
| | 123 | cc-disable-warning = $(call try-run,\ |
| | 124 | $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -xc /dev/null -o "$$TMP",-Wno-$(strip $(1))) |
| | 125 | |
| | 126 | # cc-version |
| | 127 | # Usage gcc-ver := $(call cc-version) |
| | 128 | cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) |
| | 129 | |
| | 130 | # cc-fullversion |
| | 131 | # Usage gcc-ver := $(call cc-fullversion) |
| | 132 | cc-fullversion = $(shell $(CONFIG_SHELL) \ |
| | 133 | $(srctree)/scripts/gcc-version.sh -p $(CC)) |
| | 134 | |
| | 135 | # cc-ifversion |
| | 136 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) |
| | 137 | cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3)) |
| | 138 | |
| | 139 | # cc-ldoption |
| | 140 | # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both) |
| | 141 | cc-ldoption = $(call try-run,\ |
| | 142 | $(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2)) |
| | 143 | |
| | 144 | # ld-option |
| | 145 | # Usage: LDFLAGS += $(call ld-option, -X) |
| | 146 | ld-option = $(call try-run,\ |
| | 147 | $(CC) /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2)) |
| | 148 | |
| | 149 | # ar-option |
| | 150 | # Usage: KBUILD_ARFLAGS := $(call ar-option,D) |
| | 151 | # Important: no spaces around options |
| | 152 | ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2)) |
| | 153 | |
| | 154 | ###### |
| | 155 | |
| | 156 | ### |
| | 157 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
| | 158 | # Usage: |
| | 159 | # $(Q)$(MAKE) $(build)=dir |
| | 160 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj |
| | 161 | |
| | 162 | ### |
| | 163 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj= |
| | 164 | # Usage: |
| | 165 | # $(Q)$(MAKE) $(modbuiltin)=dir |
| | 166 | modbuiltin := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.modbuiltin obj |
| | 167 | |
| | 168 | # Prefix -I with $(srctree) if it is not an absolute path. |
| | 169 | # skip if -I has no parameter |
| | 170 | addtree = $(if $(patsubst -I%,%,$(1)), \ |
| | 171 | $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)) |
| | 172 | |
| | 173 | # Find all -I options and call addtree |
| | 174 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) |
| | 175 | |
| | 176 | # echo command. |
| | 177 | # Short version is used, if $(quiet) equals `quiet_', otherwise full one. |
| | 178 | echo-cmd = $(if $($(quiet)cmd_$(1)),\ |
| | 179 | echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) |
| | 180 | |
| | 181 | # printing commands |
| | 182 | cmd = @$(echo-cmd) $(cmd_$(1)) |
| | 183 | |
| | 184 | # Add $(obj)/ for paths that are not absolute |
| | 185 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) |
| | 186 | |
| | 187 | ### |
| | 188 | # if_changed - execute command if any prerequisite is newer than |
| | 189 | # target, or command line has changed |
| | 190 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies |
| | 191 | # including used config symbols |
| | 192 | # if_changed_rule - as if_changed but execute rule instead |
| | 193 | # See Documentation/kbuild/makefiles.txt for more info |
| | 194 | |
| | 195 | ifneq ($(KBUILD_NOCMDDEP),1) |
| | 196 | # Check if both arguments has same arguments. Result is empty string if equal. |
| | 197 | # User may override this check using make KBUILD_NOCMDDEP=1 |
| | 198 | arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ |
| | 199 | $(filter-out $(cmd_$@), $(cmd_$(1))) ) |
| | 200 | endif |
| | 201 | |
| | 202 | # >'< substitution is for echo to work, |
| | 203 | # >$< substitution to preserve $ when reloading .cmd file |
| | 204 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] |
| | 205 | # in $(cmd_xxx) double $$ your perl vars |
| | 206 | make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))) |
| | 207 | |
| | 208 | # Find any prerequisites that is newer than target or that does not exist. |
| | 209 | # PHONY targets skipped in both cases. |
| | 210 | any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) |
| | 211 | |
| | 212 | # Execute command if command has changed or prerequisite(s) are updated. |
| | 213 | # |
| | 214 | if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
| | 215 | @set -e; \ |
| | 216 | $(echo-cmd) $(cmd_$(1)); \ |
| | 217 | echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) |
| | 218 | |
| | 219 | # Execute the command and also postprocess generated .d dependencies file. |
| | 220 | if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ |
| | 221 | @set -e; \ |
| | 222 | $(echo-cmd) $(cmd_$(1)); \ |
| | 223 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ |
| | 224 | rm -f $(depfile); \ |
| | 225 | mv -f $(dot-target).tmp $(dot-target).cmd) |
| | 226 | |
| | 227 | # Usage: $(call if_changed_rule,foo) |
| | 228 | # Will check if $(cmd_foo) or any of the prerequisites changed, |
| | 229 | # and if so will execute $(rule_foo). |
| | 230 | if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ |
| | 231 | @set -e; \ |
| | 232 | $(rule_$(1))) |
| | 233 | |
| | 234 | ### |
| | 235 | # why - tell why a a target got build |
| | 236 | # enabled by make V=2 |
| | 237 | # Output (listed in the order they are checked): |
| | 238 | # (1) - due to target is PHONY |
| | 239 | # (2) - due to target missing |
| | 240 | # (3) - due to: file1.h file2.h |
| | 241 | # (4) - due to command line change |
| | 242 | # (5) - due to missing .cmd file |
| | 243 | # (6) - due to target not in $(targets) |
| | 244 | # (1) PHONY targets are always build |
| | 245 | # (2) No target, so we better build it |
| | 246 | # (3) Prerequisite is newer than target |
| | 247 | # (4) The command line stored in the file named dir/.target.cmd |
| | 248 | # differed from actual command line. This happens when compiler |
| | 249 | # options changes |
| | 250 | # (5) No dir/.target.cmd file (used to store command line) |
| | 251 | # (6) No dir/.target.cmd file and target not listed in $(targets) |
| | 252 | # This is a good hint that there is a bug in the kbuild file |
| | 253 | ifeq ($(KBUILD_VERBOSE),2) |
| | 254 | why = \ |
| | 255 | $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ |
| | 256 | $(if $(wildcard $@), \ |
| | 257 | $(if $(strip $(any-prereq)),- due to: $(any-prereq), \ |
| | 258 | $(if $(arg-check), \ |
| | 259 | $(if $(cmd_$@),- due to command line change, \ |
| | 260 | $(if $(filter $@, $(targets)), \ |
| | 261 | - due to missing .cmd file, \ |
| | 262 | - due to $(notdir $@) not in $$(targets) \ |
| | 263 | ) \ |
| | 264 | ) \ |
| | 265 | ) \ |
| | 266 | ), \ |
| | 267 | - due to target missing \ |
| | 268 | ) \ |
| | 269 | ) |
| | 270 | |
| | 271 | echo-why = $(call escsq, $(strip $(why))) |
| | 272 | endif |
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