1#### 2# kbuild: Generic definitions 3 4# Convenient variables 5comma := , 6quote := " 7squote := ' 8empty := 9space := $(empty) $(empty) 10space_escape := _-_SPACE_-_ 11pound := \# 12 13### 14# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o 15dot-target = $(dir $@).$(notdir $@) 16 17### 18# The temporary file to save gcc -MD generated dependencies must not 19# contain a comma 20depfile = $(subst $(comma),_,$(dot-target).d) 21 22### 23# filename of target with directory and extension stripped 24basetarget = $(basename $(notdir $@)) 25 26### 27# filename of first prerequisite with directory and extension stripped 28baseprereq = $(basename $(notdir $<)) 29 30### 31# Escape single quote for use in echo statements 32escsq = $(subst $(squote),'\$(squote)',$1) 33 34### 35# Easy method for doing a status message 36 kecho := : 37 quiet_kecho := echo 38silent_kecho := : 39kecho := $($(quiet)kecho) 40 41### 42# filechk is used to check if the content of a generated file is updated. 43# Sample usage: 44# define filechk_sample 45# echo $KERNELRELEASE 46# endef 47# version.h : Makefile 48# $(call filechk,sample) 49# The rule defined shall write to stdout the content of the new file. 50# The existing file will be compared with the new one. 51# - If no file exist it is created 52# - If the content differ the new file is used 53# - If they are equal no change, and no timestamp update 54# - stdin is piped in from the first prerequisite ($<) so one has 55# to specify a valid file as first prerequisite (often the kbuild file) 56define filechk 57 $(Q)set -e; \ 58 mkdir -p $(dir $@); \ 59 $(filechk_$(1)) > $@.tmp; \ 60 if [ -r $@ ] && cmp -s $@ $@.tmp; then \ 61 rm -f $@.tmp; \ 62 else \ 63 $(kecho) ' UPD $@'; \ 64 mv -f $@.tmp $@; \ 65 fi 66endef 67 68###### 69# gcc support functions 70# See documentation in Documentation/kbuild/makefiles.txt 71 72# cc-cross-prefix 73# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) 74# Return first prefix where a prefix$(CC) is found in PATH. 75# If no $(CC) found in PATH with listed prefixes return nothing 76cc-cross-prefix = \ 77 $(word 1, $(foreach c,$(1), \ 78 $(shell set -e; \ 79 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \ 80 echo $(c); \ 81 fi))) 82 83# output directory for tests below 84TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/) 85 86# try-run 87# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) 88# Exit code chooses option. "$$TMP" serves as a temporary file and is 89# automatically cleaned up. 90try-run = $(shell set -e; \ 91 TMP="$(TMPOUT).$$$$.tmp"; \ 92 TMPO="$(TMPOUT).$$$$.o"; \ 93 if ($(1)) >/dev/null 2>&1; \ 94 then echo "$(2)"; \ 95 else echo "$(3)"; \ 96 fi; \ 97 rm -f "$$TMP" "$$TMPO") 98 99# as-option 100# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) 101 102as-option = $(call try-run,\ 103 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2)) 104 105# as-instr 106# Usage: cflags-y += $(call as-instr,instr,option1,option2) 107 108as-instr = $(call try-run,\ 109 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) 110 111# __cc-option 112# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586) 113__cc-option = $(call try-run,\ 114 $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4)) 115 116# Do not attempt to build with gcc plugins during cc-option tests. 117# (And this uses delayed resolution so the flags will be up to date.) 118# In addition, do not include the asm macros which are built later. 119CC_OPTION_FILTERED = $(GCC_PLUGINS_CFLAGS) $(ASM_MACRO_FLAGS) 120CC_OPTION_CFLAGS = $(filter-out $(CC_OPTION_FILTERED),$(KBUILD_CFLAGS)) 121 122# cc-option 123# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) 124 125cc-option = $(call __cc-option, $(CC),\ 126 $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2)) 127 128# hostcc-option 129# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586) 130hostcc-option = $(call __cc-option, $(HOSTCC),\ 131 $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2)) 132 133# cc-option-yn 134# Usage: flag := $(call cc-option-yn,-march=winchip-c6) 135cc-option-yn = $(call try-run,\ 136 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) 137 138# cc-disable-warning 139# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) 140cc-disable-warning = $(call try-run,\ 141 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) 142 143# cc-version 144cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) 145 146# cc-ifversion 147# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) 148cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4)) 149 150# cc-ldoption 151# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both) 152cc-ldoption = $(call try-run,\ 153 $(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2)) 154 155# ld-option 156# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y) 157ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3)) 158 159# ar-option 160# Usage: KBUILD_ARFLAGS := $(call ar-option,D) 161# Important: no spaces around options 162ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2)) 163 164# ld-version 165# Note this is mainly for HJ Lu's 3 number binutil versions 166ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh) 167 168# ld-ifversion 169# Usage: $(call ld-ifversion, -ge, 22252, y) 170ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4)) 171 172###### 173 174### 175# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= 176# Usage: 177# $(Q)$(MAKE) $(build)=dir 178build := -f $(srctree)/scripts/Makefile.build obj 179 180### 181# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj= 182# Usage: 183# $(Q)$(MAKE) $(modbuiltin)=dir 184modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj 185 186### 187# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj= 188# Usage: 189# $(Q)$(MAKE) $(dtbinst)=dir 190dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj 191 192### 193# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj= 194# Usage: 195# $(Q)$(MAKE) $(clean)=dir 196clean := -f $(srctree)/scripts/Makefile.clean obj 197 198### 199# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj= 200# Usage: 201# $(Q)$(MAKE) $(hdr-inst)=dir 202hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 203 204# Prefix -I with $(srctree) if it is not an absolute path. 205# skip if -I has no parameter 206addtree = $(if $(patsubst -I%,%,$(1)), \ 207$(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)),$(1)) 208 209# Find all -I options and call addtree 210flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) 211 212# echo command. 213# Short version is used, if $(quiet) equals `quiet_', otherwise full one. 214echo-cmd = $(if $($(quiet)cmd_$(1)),\ 215 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) 216 217# printing commands 218cmd = @$(echo-cmd) $(cmd_$(1)) 219 220# Add $(obj)/ for paths that are not absolute 221objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) 222 223### 224# if_changed - execute command if any prerequisite is newer than 225# target, or command line has changed 226# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies 227# including used config symbols 228# if_changed_rule - as if_changed but execute rule instead 229# See Documentation/kbuild/makefiles.txt for more info 230 231ifneq ($(KBUILD_NOCMDDEP),1) 232# Check if both arguments are the same including their order. Result is empty 233# string if equal. User may override this check using make KBUILD_NOCMDDEP=1 234arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \ 235 $(subst $(space),$(space_escape),$(strip $(cmd_$1)))) 236else 237arg-check = $(if $(strip $(cmd_$@)),,1) 238endif 239 240# Replace >$< with >$$< to preserve $ when reloading the .cmd file 241# (needed for make) 242# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file 243# (needed for make) 244# Replace >'< with >'\''< to be able to enclose the whole string in '...' 245# (needed for the shell) 246make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) 247 248# Find any prerequisites that is newer than target or that does not exist. 249# PHONY targets skipped in both cases. 250any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) 251 252# Execute command if command has changed or prerequisite(s) are updated. 253if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ 254 @set -e; \ 255 $(echo-cmd) $(cmd_$(1)); \ 256 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) 257 258# Execute the command and also postprocess generated .d dependencies file. 259if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ 260 @set -e; \ 261 $(cmd_and_fixdep), @:) 262 263ifndef CONFIG_TRIM_UNUSED_KSYMS 264 265cmd_and_fixdep = \ 266 $(echo-cmd) $(cmd_$(1)); \ 267 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ 268 rm -f $(depfile); \ 269 mv -f $(dot-target).tmp $(dot-target).cmd; 270 271else 272 273# Filter out exported kernel symbol names from the preprocessor output. 274# See also __KSYM_DEPS__ in include/linux/export.h. 275# We disable the depfile generation here, so as not to overwrite the existing 276# depfile while fixdep is parsing it. 277flags_nodeps = $(filter-out -Wp$(comma)-M%, $($(1))) 278ksym_dep_filter = \ 279 case "$(1)" in \ 280 cc_*_c|cpp_i_c) \ 281 $(CPP) $(call flags_nodeps,c_flags) -D__KSYM_DEPS__ $< ;; \ 282 as_*_S|cpp_s_S) \ 283 $(CPP) $(call flags_nodeps,a_flags) -D__KSYM_DEPS__ $< ;; \ 284 boot*|build*|cpp_its_S|*cpp_lds_S|dtc|host*|vdso*) : ;; \ 285 *) echo "Don't know how to preprocess $(1)" >&2; false ;; \ 286 esac | tr ";" "\n" | sed -n 's/^.*=== __KSYM_\(.*\) ===.*$$/_\1/p' 287 288cmd_and_fixdep = \ 289 $(echo-cmd) $(cmd_$(1)); \ 290 $(ksym_dep_filter) | \ 291 scripts/basic/fixdep -e $(depfile) $@ '$(make-cmd)' \ 292 > $(dot-target).tmp; \ 293 rm -f $(depfile); \ 294 mv -f $(dot-target).tmp $(dot-target).cmd; 295 296endif 297 298# Usage: $(call if_changed_rule,foo) 299# Will check if $(cmd_foo) or any of the prerequisites changed, 300# and if so will execute $(rule_foo). 301if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ 302 @set -e; \ 303 $(rule_$(1)), @:) 304 305### 306# why - tell why a target got built 307# enabled by make V=2 308# Output (listed in the order they are checked): 309# (1) - due to target is PHONY 310# (2) - due to target missing 311# (3) - due to: file1.h file2.h 312# (4) - due to command line change 313# (5) - due to missing .cmd file 314# (6) - due to target not in $(targets) 315# (1) PHONY targets are always build 316# (2) No target, so we better build it 317# (3) Prerequisite is newer than target 318# (4) The command line stored in the file named dir/.target.cmd 319# differed from actual command line. This happens when compiler 320# options changes 321# (5) No dir/.target.cmd file (used to store command line) 322# (6) No dir/.target.cmd file and target not listed in $(targets) 323# This is a good hint that there is a bug in the kbuild file 324ifeq ($(KBUILD_VERBOSE),2) 325why = \ 326 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ 327 $(if $(wildcard $@), \ 328 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \ 329 $(if $(arg-check), \ 330 $(if $(cmd_$@),- due to command line change, \ 331 $(if $(filter $@, $(targets)), \ 332 - due to missing .cmd file, \ 333 - due to $(notdir $@) not in $$(targets) \ 334 ) \ 335 ) \ 336 ) \ 337 ), \ 338 - due to target missing \ 339 ) \ 340 ) 341 342echo-why = $(call escsq, $(strip $(why))) 343endif 344 345############################################################################### 346# 347# When a Kconfig string contains a filename, it is suitable for 348# passing to shell commands. It is surrounded by double-quotes, and 349# any double-quotes or backslashes within it are escaped by 350# backslashes. 351# 352# This is no use for dependencies or $(wildcard). We need to strip the 353# surrounding quotes and the escaping from quotes and backslashes, and 354# we *do* need to escape any spaces in the string. So, for example: 355# 356# Usage: $(eval $(call config_filename,FOO)) 357# 358# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option, 359# transformed as described above to be suitable for use within the 360# makefile. 361# 362# Also, if the filename is a relative filename and exists in the source 363# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to 364# be prefixed to *both* command invocation and dependencies. 365# 366# Note: We also print the filenames in the quiet_cmd_foo text, and 367# perhaps ought to have a version specially escaped for that purpose. 368# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good 369# enough. It'll strip the quotes in the common case where there's no 370# space and it's a simple filename, and it'll retain the quotes when 371# there's a space. There are some esoteric cases in which it'll print 372# the wrong thing, but we don't really care. The actual dependencies 373# and commands *do* get it right, with various combinations of single 374# and double quotes, backslashes and spaces in the filenames. 375# 376############################################################################### 377# 378define config_filename 379ifneq ($$(CONFIG_$(1)),"") 380$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1))))))) 381ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME))) 382else 383ifeq ($$(wildcard $$($(1)_FILENAME)),) 384ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),) 385$(1)_SRCPREFIX := $(srctree)/ 386endif 387endif 388endif 389endif 390endef 391# 392############################################################################### 393 394# delete partially updated (i.e. corrupted) files on error 395.DELETE_ON_ERROR: 396