1# SPDX-License-Identifier: GPL-2.0 2# Backward compatibility 3asflags-y += $(EXTRA_AFLAGS) 4ccflags-y += $(EXTRA_CFLAGS) 5cppflags-y += $(EXTRA_CPPFLAGS) 6ldflags-y += $(EXTRA_LDFLAGS) 7 8# flags that take effect in current and sub directories 9KBUILD_AFLAGS += $(subdir-asflags-y) 10KBUILD_CFLAGS += $(subdir-ccflags-y) 11 12# Figure out what we need to build from the various variables 13# =========================================================================== 14 15# When an object is listed to be built compiled-in and modular, 16# only build the compiled-in version 17obj-m := $(filter-out $(obj-y),$(obj-m)) 18 19# Libraries are always collected in one lib file. 20# Filter out objects already built-in 21lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) 22 23# Subdirectories we need to descend into 24subdir-ym := $(sort $(subdir-y) $(subdir-m) \ 25 $(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m)))) 26 27# Handle objects in subdirs: 28# - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and 29# foo/modules.order 30# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order 31# 32# Generate modules.order to determine modorder. Unfortunately, we don't have 33# information about ordering between -y and -m subdirs. Just put -y's first. 34 35ifdef need-modorder 36obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m)) 37else 38obj-m := $(filter-out %/, $(obj-m)) 39endif 40 41ifdef need-builtin 42obj-y := $(patsubst %/, %/built-in.a, $(obj-y)) 43else 44obj-y := $(filter-out %/, $(obj-y)) 45endif 46 47# Expand $(foo-objs) $(foo-y) by calling $(call suffix-search,foo.o,-objs -y) 48suffix-search = $(strip $(foreach s, $2, $($(1:.o=$s)))) 49# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object 50multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2 -), $m))) 51multi-obj-y := $(call multi-search,$(obj-y),-objs -y) 52multi-obj-m := $(call multi-search,$(obj-m),-objs -y -m) 53multi-obj-ym := $(multi-obj-y) $(multi-obj-m) 54 55# Replace multi-part objects by their individual parts, 56# including built-in.a from subdirectories 57real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2 -), $(call suffix-search, $m, $2), $m)) 58real-obj-y := $(call real-search, $(obj-y),-objs -y) 59real-obj-m := $(call real-search, $(obj-m),-objs -y -m) 60 61always-y += $(always-m) 62 63# hostprogs-always-y += foo 64# ... is a shorthand for 65# hostprogs += foo 66# always-y += foo 67hostprogs += $(hostprogs-always-y) $(hostprogs-always-m) 68always-y += $(hostprogs-always-y) $(hostprogs-always-m) 69 70# userprogs-always-y is likewise. 71userprogs += $(userprogs-always-y) $(userprogs-always-m) 72always-y += $(userprogs-always-y) $(userprogs-always-m) 73 74# DTB 75# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built 76dtb-$(CONFIG_OF_ALL_DTBS) += $(dtb-) 77 78# List all dtbs to be generated by fdtoverlay 79overlay-y := $(foreach m,$(dtb-y), $(if $(strip $($(m:.dtb=-dtbs))),$(m),)) 80 81# Generate symbols for the base files so overlays can be applied to them. 82$(foreach m,$(overlay-y), $(eval DTC_FLAGS_$(basename $(firstword $($(m:.dtb=-dtbs)))) += -@)) 83 84# Add base dtb and overlay dtbo 85dtb-y += $(foreach m,$(overlay-y), $($(m:.dtb=-dtbs))) 86 87always-y += $(dtb-y) 88 89ifneq ($(CHECK_DTBS),) 90# Don't run schema checks for dtbs created by fdtoverlay as they don't 91# have corresponding dts files. 92dt-yaml-y := $(filter-out $(overlay-y),$(dtb-y)) 93 94always-y += $(patsubst %.dtb,%.dt.yaml, $(dt-yaml-y)) 95always-y += $(patsubst %.dtbo,%.dt.yaml, $(dt-yaml-y)) 96endif 97 98# Add subdir path 99 100extra-y := $(addprefix $(obj)/,$(extra-y)) 101always-y := $(addprefix $(obj)/,$(always-y)) 102targets := $(addprefix $(obj)/,$(targets)) 103obj-m := $(addprefix $(obj)/,$(obj-m)) 104lib-y := $(addprefix $(obj)/,$(lib-y)) 105real-obj-y := $(addprefix $(obj)/,$(real-obj-y)) 106real-obj-m := $(addprefix $(obj)/,$(real-obj-m)) 107multi-obj-m := $(addprefix $(obj)/, $(multi-obj-m)) 108subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) 109 110# Finds the multi-part object the current object will be linked into. 111# If the object belongs to two or more multi-part objects, list them all. 112modname-multi = $(sort $(foreach m,$(multi-obj-ym),\ 113 $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=)))) 114 115__modname = $(if $(modname-multi),$(modname-multi),$(basetarget)) 116 117modname = $(subst $(space),:,$(__modname)) 118modfile = $(addprefix $(obj)/,$(__modname)) 119 120# target with $(obj)/ and its suffix stripped 121target-stem = $(basename $(patsubst $(obj)/%,%,$@)) 122 123# These flags are needed for modversions and compiling, so we define them here 124# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will 125# end up in (or would, if it gets compiled in) 126name-fix-token = $(subst $(comma),_,$(subst -,_,$1)) 127name-fix = $(call stringify,$(call name-fix-token,$1)) 128basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget)) 129modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \ 130 -D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname)) 131modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile)) 132 133_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \ 134 $(filter-out $(ccflags-remove-y), \ 135 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \ 136 $(CFLAGS_$(target-stem).o)) 137_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \ 138 $(filter-out $(asflags-remove-y), \ 139 $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \ 140 $(AFLAGS_$(target-stem).o)) 141_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds) 142 143# 144# Enable gcov profiling flags for a file, directory or for all files depending 145# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL 146# (in this order) 147# 148ifeq ($(CONFIG_GCOV_KERNEL),y) 149_c_flags += $(if $(patsubst n%,, \ 150 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \ 151 $(CFLAGS_GCOV)) 152endif 153 154# 155# Enable address sanitizer flags for kernel except some files or directories 156# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) 157# 158ifeq ($(CONFIG_KASAN),y) 159ifneq ($(CONFIG_KASAN_HW_TAGS),y) 160_c_flags += $(if $(patsubst n%,, \ 161 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ 162 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE)) 163endif 164endif 165 166ifeq ($(CONFIG_UBSAN),y) 167_c_flags += $(if $(patsubst n%,, \ 168 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \ 169 $(CFLAGS_UBSAN)) 170endif 171 172ifeq ($(CONFIG_KCOV),y) 173_c_flags += $(if $(patsubst n%,, \ 174 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \ 175 $(CFLAGS_KCOV)) 176endif 177 178# 179# Enable KCSAN flags except some files or directories we don't want to check 180# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE) 181# 182ifeq ($(CONFIG_KCSAN),y) 183_c_flags += $(if $(patsubst n%,, \ 184 $(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \ 185 $(CFLAGS_KCSAN)) 186endif 187 188# $(srctree)/$(src) for including checkin headers from generated source files 189# $(objtree)/$(obj) for including generated headers from checkin source files 190ifeq ($(KBUILD_EXTMOD),) 191ifdef building_out_of_srctree 192_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 193_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 194_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 195endif 196endif 197 198part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y) 199quiet_modtag = $(if $(part-of-module),[M], ) 200 201modkern_cflags = \ 202 $(if $(part-of-module), \ 203 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ 204 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags)) 205 206modkern_aflags = $(if $(part-of-module), \ 207 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \ 208 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)) 209 210c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 211 -include $(srctree)/include/linux/compiler_types.h \ 212 $(_c_flags) $(modkern_cflags) \ 213 $(basename_flags) $(modname_flags) 214 215a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 216 $(_a_flags) $(modkern_aflags) 217 218cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 219 $(_cpp_flags) 220 221ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) 222 223DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes 224 225dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc \ 226 $(addprefix -I,$(DTC_INCLUDE)) \ 227 -undef -D__DTS__ 228 229# Objtool arguments are also needed for modfinal with LTO, so we define 230# then here to avoid duplication. 231objtool_args = \ 232 $(if $(CONFIG_UNWINDER_ORC),orc generate,check) \ 233 $(if $(part-of-module), --module,) \ 234 $(if $(CONFIG_FRAME_POINTER),, --no-fp) \ 235 $(if $(or $(CONFIG_GCOV_KERNEL),$(CONFIG_LTO_CLANG)), \ 236 --no-unreachable,) \ 237 $(if $(CONFIG_RETPOLINE), --retpoline,) \ 238 $(if $(CONFIG_X86_SMAP), --uaccess,) \ 239 $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount,) 240 241# Useful for describing the dependency of composite objects 242# Usage: 243# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 244define multi_depend 245$(foreach m, $(notdir $1), \ 246 $(eval $(obj)/$m: \ 247 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) 248endef 249 250quiet_cmd_copy = COPY $@ 251 cmd_copy = cp $< $@ 252 253# Shipped files 254# =========================================================================== 255# 'cp' preserves permissions. If you use it to copy a file in read-only srctree, 256# the copy would be read-only as well, leading to an error when executing the 257# rule next time. Use 'cat' instead in order to generate a writable file. 258 259quiet_cmd_shipped = SHIPPED $@ 260cmd_shipped = cat $< > $@ 261 262$(obj)/%: $(src)/%_shipped 263 $(call cmd,shipped) 264 265# Commands useful for building a boot image 266# =========================================================================== 267# 268# Use as following: 269# 270# target: source(s) FORCE 271# $(if_changed,ld/objcopy/gzip) 272# 273# and add target to 'targets' so that we know we have to 274# read in the saved command line 275 276# Linking 277# --------------------------------------------------------------------------- 278 279quiet_cmd_ld = LD $@ 280 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@ 281 282# Archive 283# --------------------------------------------------------------------------- 284 285quiet_cmd_ar = AR $@ 286 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs) 287 288# Objcopy 289# --------------------------------------------------------------------------- 290 291quiet_cmd_objcopy = OBJCOPY $@ 292cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 293 294# Gzip 295# --------------------------------------------------------------------------- 296 297quiet_cmd_gzip = GZIP $@ 298 cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@ 299 300# DTC 301# --------------------------------------------------------------------------- 302DTC ?= $(objtree)/scripts/dtc/dtc 303DTC_FLAGS += -Wno-interrupt_provider 304 305# Disable noisy checks by default 306ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),) 307DTC_FLAGS += -Wno-unit_address_vs_reg \ 308 -Wno-unit_address_format \ 309 -Wno-avoid_unnecessary_addr_size \ 310 -Wno-alias_paths \ 311 -Wno-graph_child_address \ 312 -Wno-simple_bus_reg \ 313 -Wno-unique_unit_address \ 314 -Wno-pci_device_reg 315endif 316 317ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),) 318DTC_FLAGS += -Wnode_name_chars_strict \ 319 -Wproperty_name_chars_strict \ 320 -Winterrupt_provider 321endif 322 323DTC_FLAGS += $(DTC_FLAGS_$(basetarget)) 324 325# Generate an assembly file to wrap the output of the device tree compiler 326quiet_cmd_dt_S_dtb= DTB $@ 327cmd_dt_S_dtb= \ 328{ \ 329 echo '\#include <asm-generic/vmlinux.lds.h>'; \ 330 echo '.section .dtb.init.rodata,"a"'; \ 331 echo '.balign STRUCT_ALIGNMENT'; \ 332 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \ 333 echo '__dtb_$(subst -,_,$(*F))_begin:'; \ 334 echo '.incbin "$<" '; \ 335 echo '__dtb_$(subst -,_,$(*F))_end:'; \ 336 echo '.global __dtb_$(subst -,_,$(*F))_end'; \ 337 echo '.balign STRUCT_ALIGNMENT'; \ 338} > $@ 339 340$(obj)/%.dtb.S: $(obj)/%.dtb FORCE 341 $(call if_changed,dt_S_dtb) 342 343quiet_cmd_dtc = DTC $@ 344cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ 345 $(DTC) -o $@ -b 0 \ 346 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \ 347 -d $(depfile).dtc.tmp $(dtc-tmp) ; \ 348 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) 349 350$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE 351 $(call if_changed_dep,dtc) 352 353$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE 354 $(call if_changed_dep,dtc) 355 356overlay-y := $(addprefix $(obj)/, $(overlay-y)) 357 358quiet_cmd_fdtoverlay = DTOVL $@ 359 cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(real-prereqs) 360 361$(overlay-y): FORCE 362 $(call if_changed,fdtoverlay) 363$(call multi_depend, $(overlay-y), .dtb, -dtbs) 364 365DT_CHECKER ?= dt-validate 366DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),,-m) 367DT_BINDING_DIR := Documentation/devicetree/bindings 368# DT_TMP_SCHEMA may be overridden from Documentation/devicetree/bindings/Makefile 369DT_TMP_SCHEMA ?= $(objtree)/$(DT_BINDING_DIR)/processed-schema.json 370 371quiet_cmd_dtb_check = CHECK $@ 372 cmd_dtb_check = $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ 373 374define rule_dtc 375 $(call cmd_and_fixdep,dtc) 376 $(call cmd,dtb_check) 377endef 378 379$(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE 380 $(call if_changed_rule,dtc) 381 382dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) 383 384# Bzip2 385# --------------------------------------------------------------------------- 386 387# Bzip2 and LZMA do not include size in file... so we have to fake that; 388# append the size as a 32-bit littleendian number as gzip does. 389size_append = printf $(shell \ 390dec_size=0; \ 391for F in $(real-prereqs); do \ 392 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \ 393 dec_size=$$(expr $$dec_size + $$fsize); \ 394done; \ 395printf "%08x\n" $$dec_size | \ 396 sed 's/\(..\)/\1 /g' | { \ 397 read ch0 ch1 ch2 ch3; \ 398 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 399 printf '%s%03o' '\\' $$((0x$$ch)); \ 400 done; \ 401 } \ 402) 403 404quiet_cmd_bzip2 = BZIP2 $@ 405 cmd_bzip2 = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@ 406 407# Lzma 408# --------------------------------------------------------------------------- 409 410quiet_cmd_lzma = LZMA $@ 411 cmd_lzma = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@ 412 413quiet_cmd_lzo = LZO $@ 414 cmd_lzo = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@ 415 416quiet_cmd_lz4 = LZ4 $@ 417 cmd_lz4 = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \ 418 $(size_append); } > $@ 419 420# U-Boot mkimage 421# --------------------------------------------------------------------------- 422 423MKIMAGE := $(srctree)/scripts/mkuboot.sh 424 425# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 426# the number of overrides in arch makefiles 427UIMAGE_ARCH ?= $(SRCARCH) 428UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) 429UIMAGE_OPTS-y ?= 430UIMAGE_TYPE ?= kernel 431UIMAGE_LOADADDR ?= arch_must_set_this 432UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 433UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' 434 435quiet_cmd_uimage = UIMAGE $@ 436 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ 437 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ 438 -T $(UIMAGE_TYPE) \ 439 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ 440 -n $(UIMAGE_NAME) -d $< $@ 441 442# XZ 443# --------------------------------------------------------------------------- 444# Use xzkern to compress the kernel image and xzmisc to compress other things. 445# 446# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 447# of the kernel decompressor. A BCJ filter is used if it is available for 448# the target architecture. xzkern also appends uncompressed size of the data 449# using size_append. The .xz format has the size information available at 450# the end of the file too, but it's in more complex format and it's good to 451# avoid changing the part of the boot code that reads the uncompressed size. 452# Note that the bytes added by size_append will make the xz tool think that 453# the file is corrupt. This is expected. 454# 455# xzmisc doesn't use size_append, so it can be used to create normal .xz 456# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 457# big dictionary would increase the memory usage too much in the multi-call 458# decompression mode. A BCJ filter isn't used either. 459quiet_cmd_xzkern = XZKERN $@ 460 cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \ 461 $(size_append); } > $@ 462 463quiet_cmd_xzmisc = XZMISC $@ 464 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@ 465 466# ZSTD 467# --------------------------------------------------------------------------- 468# Appends the uncompressed size of the data using size_append. The .zst 469# format has the size information available at the beginning of the file too, 470# but it's in a more complex format and it's good to avoid changing the part 471# of the boot code that reads the uncompressed size. 472# 473# Note that the bytes added by size_append will make the zstd tool think that 474# the file is corrupt. This is expected. 475# 476# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of 477# 128 MB. zstd22 is used for kernel compression because it is decompressed in a 478# single pass, so zstd doesn't need to allocate a window buffer. When streaming 479# decompression is used, like initramfs decompression, zstd22 should likely not 480# be used because it would require zstd to allocate a 128 MB buffer. 481 482quiet_cmd_zstd = ZSTD $@ 483 cmd_zstd = { cat $(real-prereqs) | $(ZSTD) -19; $(size_append); } > $@ 484 485quiet_cmd_zstd22 = ZSTD22 $@ 486 cmd_zstd22 = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@ 487 488# ASM offsets 489# --------------------------------------------------------------------------- 490 491# Default sed regexp - multiline due to syntax constraints 492# 493# Use [:space:] because LLVM's integrated assembler inserts <tab> around 494# the .ascii directive whereas GCC keeps the <space> as-is. 495define sed-offsets 496 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ 497 /^->/{s:->#\(.*\):/* \1 */:; \ 498 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ 499 s:->::; p;}' 500endef 501 502# Use filechk to avoid rebuilds when a header changes, but the resulting file 503# does not 504define filechk_offsets 505 echo "#ifndef $2"; \ 506 echo "#define $2"; \ 507 echo "/*"; \ 508 echo " * DO NOT MODIFY."; \ 509 echo " *"; \ 510 echo " * This file was generated by Kbuild"; \ 511 echo " */"; \ 512 echo ""; \ 513 sed -ne $(sed-offsets) < $<; \ 514 echo ""; \ 515 echo "#endif" 516endef 517