1# SPDX-License-Identifier: GPL-2.0 2 3# Finds the multi-part object the current object will be linked into. 4# If the object belongs to two or more multi-part objects, list them all. 5modname-multi = $(sort $(foreach m,$(multi-obj-ym),\ 6 $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=)))) 7 8__modname = $(or $(modname-multi),$(basetarget)) 9 10modname = $(subst $(space),:,$(__modname)) 11modfile = $(addprefix $(obj)/,$(__modname)) 12 13# target with $(obj)/ and its suffix stripped 14target-stem = $(basename $(patsubst $(obj)/%,%,$@)) 15 16# These flags are needed for modversions and compiling, so we define them here 17# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will 18# end up in (or would, if it gets compiled in) 19name-fix-token = $(subst $(comma),_,$(subst -,_,$1)) 20name-fix = $(call stringify,$(call name-fix-token,$1)) 21basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget)) 22modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \ 23 -D__KBUILD_MODNAME=$(call name-fix-token,$(modname)) 24modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile)) 25 26_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \ 27 $(filter-out $(ccflags-remove-y), \ 28 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \ 29 $(CFLAGS_$(target-stem).o)) 30_rust_flags = $(filter-out $(RUSTFLAGS_REMOVE_$(target-stem).o), \ 31 $(filter-out $(rustflags-remove-y), \ 32 $(KBUILD_RUSTFLAGS) $(rustflags-y)) \ 33 $(RUSTFLAGS_$(target-stem).o)) 34_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \ 35 $(filter-out $(asflags-remove-y), \ 36 $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \ 37 $(AFLAGS_$(target-stem).o)) 38_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds) 39 40# 41# Enable gcov profiling flags for a file, directory or for all files depending 42# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL 43# (in this order) 44# 45ifeq ($(CONFIG_GCOV_KERNEL),y) 46_c_flags += $(if $(patsubst n%,, \ 47 $(GCOV_PROFILE_$(target-stem).o)$(GCOV_PROFILE)$(if $(is-kernel-object),$(CONFIG_GCOV_PROFILE_ALL))), \ 48 $(CFLAGS_GCOV)) 49endif 50 51# 52# Enable address sanitizer flags for kernel except some files or directories 53# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) 54# 55ifeq ($(CONFIG_KASAN),y) 56ifneq ($(CONFIG_KASAN_HW_TAGS),y) 57_c_flags += $(if $(patsubst n%,, \ 58 $(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \ 59 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE)) 60_rust_flags += $(if $(patsubst n%,, \ 61 $(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \ 62 $(RUSTFLAGS_KASAN)) 63endif 64endif 65 66ifeq ($(CONFIG_KMSAN),y) 67_c_flags += $(if $(patsubst n%,, \ 68 $(KMSAN_SANITIZE_$(target-stem).o)$(KMSAN_SANITIZE)$(is-kernel-object)), \ 69 $(CFLAGS_KMSAN)) 70_c_flags += $(if $(patsubst n%,, \ 71 $(KMSAN_ENABLE_CHECKS_$(target-stem).o)$(KMSAN_ENABLE_CHECKS)$(is-kernel-object)), \ 72 , -mllvm -msan-disable-checks=1) 73endif 74 75ifeq ($(CONFIG_UBSAN),y) 76_c_flags += $(if $(patsubst n%,, \ 77 $(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_SANITIZE)$(is-kernel-object)), \ 78 $(CFLAGS_UBSAN)) 79_c_flags += $(if $(patsubst n%,, \ 80 $(UBSAN_INTEGER_WRAP_$(target-stem).o)$(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_INTEGER_WRAP)$(UBSAN_SANITIZE)$(is-kernel-object)), \ 81 $(CFLAGS_UBSAN_INTEGER_WRAP)) 82endif 83 84ifeq ($(CONFIG_KCOV),y) 85_c_flags += $(if $(patsubst n%,, \ 86 $(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \ 87 $(CFLAGS_KCOV)) 88_rust_flags += $(if $(patsubst n%,, \ 89 $(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \ 90 $(RUSTFLAGS_KCOV)) 91endif 92 93# 94# Enable KCSAN flags except some files or directories we don't want to check 95# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE) 96# 97ifeq ($(CONFIG_KCSAN),y) 98_c_flags += $(if $(patsubst n%,, \ 99 $(KCSAN_SANITIZE_$(target-stem).o)$(KCSAN_SANITIZE)$(is-kernel-object)), \ 100 $(CFLAGS_KCSAN)) 101# Some uninstrumented files provide implied barriers required to avoid false 102# positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only. 103_c_flags += $(if $(patsubst n%,, \ 104 $(KCSAN_INSTRUMENT_BARRIERS_$(target-stem).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \ 105 -D__KCSAN_INSTRUMENT_BARRIERS__) 106endif 107 108# 109# Enable AutoFDO build flags except some files or directories we don't want to 110# enable (depends on variables AUTOFDO_PROFILE_obj.o and AUTOFDO_PROFILE). 111# 112ifeq ($(CONFIG_AUTOFDO_CLANG),y) 113_c_flags += $(if $(patsubst n%,, \ 114 $(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(is-kernel-object)), \ 115 $(CFLAGS_AUTOFDO_CLANG)) 116endif 117 118# 119# Enable Propeller build flags except some files or directories we don't want to 120# enable (depends on variables AUTOFDO_PROPELLER_obj.o and PROPELLER_PROFILE). 121# 122ifdef CONFIG_PROPELLER_CLANG 123_c_flags += $(if $(patsubst n%,, \ 124 $(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(PROPELLER_PROFILE))$(is-kernel-object), \ 125 $(CFLAGS_PROPELLER_CLANG)) 126endif 127 128# $(src) for including checkin headers from generated source files 129# $(obj) for including generated headers from checkin source files 130ifdef building_out_of_srctree 131_c_flags += $(addprefix -I, $(src) $(obj)) 132_a_flags += $(addprefix -I, $(src) $(obj)) 133_cpp_flags += $(addprefix -I, $(src) $(obj)) 134endif 135 136# If $(is-kernel-object) is 'y', this object will be linked to vmlinux or modules 137is-kernel-object = $(or $(part-of-builtin),$(part-of-module)) 138 139part-of-builtin = $(if $(filter $(basename $@).o, $(real-obj-y) $(lib-y)),y) 140part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y) 141quiet_modtag = $(if $(part-of-module),[M], ) 142 143modkern_cflags = \ 144 $(if $(part-of-module), \ 145 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ 146 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags)) 147 148modkern_rustflags = \ 149 $(if $(part-of-module), \ 150 $(KBUILD_RUSTFLAGS_MODULE) $(RUSTFLAGS_MODULE), \ 151 $(KBUILD_RUSTFLAGS_KERNEL) $(RUSTFLAGS_KERNEL)) 152 153modkern_aflags = $(if $(part-of-module), \ 154 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \ 155 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) $(modfile_flags)) 156 157c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 158 -include $(srctree)/include/linux/compiler_types.h \ 159 $(_c_flags) $(modkern_cflags) \ 160 $(basename_flags) $(modname_flags) 161 162rust_flags = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg 163 164a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 165 $(_a_flags) $(modkern_aflags) $(modname_flags) 166 167cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 168 $(_cpp_flags) 169 170ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) 171 172ifdef CONFIG_OBJTOOL 173 174objtool := $(objtree)/tools/objtool/objtool 175 176objtool-args-$(CONFIG_KLP_BUILD) += --checksum 177objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) += --hacks=jump_label 178objtool-args-$(CONFIG_HAVE_NOINSTR_HACK) += --hacks=noinstr 179objtool-args-$(CONFIG_MITIGATION_CALL_DEPTH_TRACKING) += --hacks=skylake 180objtool-args-$(CONFIG_X86_KERNEL_IBT) += --ibt 181objtool-args-$(CONFIG_FINEIBT) += --cfi 182objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL) += --mcount 183ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 184objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT) += --mnop 185endif 186objtool-args-$(CONFIG_UNWINDER_ORC) += --orc 187objtool-args-$(CONFIG_MITIGATION_RETPOLINE) += --retpoline 188objtool-args-$(CONFIG_MITIGATION_RETHUNK) += --rethunk 189objtool-args-$(CONFIG_MITIGATION_SLS) += --sls 190objtool-args-$(CONFIG_STACK_VALIDATION) += --stackval 191objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE) += --static-call 192objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION) += --uaccess 193objtool-args-$(or $(CONFIG_GCOV_KERNEL),$(CONFIG_KCOV)) += --no-unreachable 194objtool-args-$(CONFIG_PREFIX_SYMBOLS) += --prefix=$(CONFIG_FUNCTION_PADDING_BYTES) 195objtool-args-$(CONFIG_OBJTOOL_WERROR) += --werror 196 197objtool-args = $(objtool-args-y) \ 198 $(if $(delay-objtool), --link) \ 199 $(if $(part-of-module), --module) 200 201delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT),$(CONFIG_KLP_BUILD)) 202 203cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool-args) $@) 204cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd) 205 206objtool-enabled := y 207 208endif # CONFIG_OBJTOOL 209 210# Useful for describing the dependency of composite objects 211# Usage: 212# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 213define multi_depend 214$(foreach m, $1, \ 215 $(eval $m: \ 216 $(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3)))) 217endef 218 219# Remove ".." and "." from a path, without using "realpath" 220# Usage: 221# $(call normalize_path,path/to/../file) 222define normalize_path 223$(strip $(eval elements :=) \ 224$(foreach elem,$(subst /, ,$1), \ 225 $(if $(filter-out .,$(elem)), \ 226 $(if $(filter ..,$(elem)), \ 227 $(eval elements := $(wordlist 2,$(words $(elements)),x $(elements))), \ 228 $(eval elements := $(elements) $(elem))))) \ 229$(subst $(space),/,$(elements))) 230endef 231 232# Build commands 233# =========================================================================== 234# These are shared by some Makefile.* files. 235 236ifdef CONFIG_LTO_CLANG 237# Run $(LD) here to convert LLVM IR to ELF in the following cases: 238# - when this object needs objtool processing, as objtool cannot process LLVM IR 239# - when this is a single-object module, as modpost cannot process LLVM IR 240cmd_ld_single = $(if $(objtool-enabled)$(is-single-obj-m), ; $(LD) $(ld_flags) -r -o $(tmp-target) $@; mv $(tmp-target) $@) 241endif 242 243quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ 244 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< \ 245 $(cmd_ld_single) \ 246 $(cmd_objtool) 247 248define rule_cc_o_c 249 $(call cmd_and_fixdep,cc_o_c) 250 $(call cmd,checksrc) 251 $(call cmd,checkdoc) 252 $(call cmd,gen_objtooldep) 253 $(call cmd,gen_symversions_c) 254 $(call cmd,record_mcount) 255 $(call cmd,warn_shared_object) 256endef 257 258quiet_cmd_as_o_S = AS $(quiet_modtag) $@ 259 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool) 260 261define rule_as_o_S 262 $(call cmd_and_fixdep,as_o_S) 263 $(call cmd,gen_objtooldep) 264 $(call cmd,gen_symversions_S) 265 $(call cmd,warn_shared_object) 266endef 267 268# Copy a file 269# =========================================================================== 270# 'cp' preserves permissions. If you use it to copy a file in read-only srctree, 271# the copy would be read-only as well, leading to an error when executing the 272# rule next time. Use 'cat' instead in order to generate a writable file. 273quiet_cmd_copy = COPY $@ 274 cmd_copy = cat $< > $@ 275 276$(obj)/%: $(src)/%_shipped 277 $(call cmd,copy) 278 279# Touch a file 280# =========================================================================== 281quiet_cmd_touch = TOUCH $(call normalize_path,$@) 282 cmd_touch = touch $@ 283 284# Commands useful for building a boot image 285# =========================================================================== 286# 287# Use as following: 288# 289# target: source(s) FORCE 290# $(if_changed,ld/objcopy/gzip) 291# 292# and add target to 'targets' so that we know we have to 293# read in the saved command line 294 295# Linking 296# --------------------------------------------------------------------------- 297 298quiet_cmd_ld = LD $@ 299 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@ 300 301# Archive 302# --------------------------------------------------------------------------- 303 304quiet_cmd_ar = AR $@ 305 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs) 306 307# Objcopy 308# --------------------------------------------------------------------------- 309 310quiet_cmd_objcopy = OBJCOPY $@ 311cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 312 313# Gzip 314# --------------------------------------------------------------------------- 315 316quiet_cmd_gzip = GZIP $@ 317 cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@ 318 319# Bzip2 320# --------------------------------------------------------------------------- 321 322# Bzip2 and LZMA do not include size in file... so we have to fake that; 323# append the size as a 32-bit littleendian number as gzip does. 324size_append = printf $(shell \ 325dec_size=0; \ 326for F in $(real-prereqs); do \ 327 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \ 328 dec_size=$$(expr $$dec_size + $$fsize); \ 329done; \ 330printf "%08x\n" $$dec_size | \ 331 sed 's/\(..\)/\1 /g' | { \ 332 read ch0 ch1 ch2 ch3; \ 333 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 334 printf '%s%03o' '\\' $$((0x$$ch)); \ 335 done; \ 336 } \ 337) 338 339quiet_cmd_file_size = GEN $@ 340 cmd_file_size = $(size_append) > $@ 341 342quiet_cmd_bzip2 = BZIP2 $@ 343 cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@ 344 345quiet_cmd_bzip2_with_size = BZIP2 $@ 346 cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@ 347 348# Lzma 349# --------------------------------------------------------------------------- 350 351quiet_cmd_lzma = LZMA $@ 352 cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@ 353 354quiet_cmd_lzma_with_size = LZMA $@ 355 cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@ 356 357quiet_cmd_lzo = LZO $@ 358 cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@ 359 360quiet_cmd_lzo_with_size = LZO $@ 361 cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@ 362 363quiet_cmd_lz4 = LZ4 $@ 364 cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -9 - - > $@ 365 366quiet_cmd_lz4_with_size = LZ4 $@ 367 cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -9 - -; \ 368 $(size_append); } > $@ 369 370# U-Boot mkimage 371# --------------------------------------------------------------------------- 372 373MKIMAGE := $(srctree)/scripts/mkuboot.sh 374 375# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 376# the number of overrides in arch makefiles 377UIMAGE_ARCH ?= $(SRCARCH) 378UIMAGE_COMPRESSION ?= $(or $(2),none) 379UIMAGE_OPTS-y ?= 380UIMAGE_TYPE ?= kernel 381UIMAGE_LOADADDR ?= arch_must_set_this 382UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 383UIMAGE_NAME ?= Linux-$(KERNELRELEASE) 384 385quiet_cmd_uimage = UIMAGE $@ 386 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ 387 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ 388 -T $(UIMAGE_TYPE) \ 389 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ 390 -n '$(UIMAGE_NAME)' -d $< $@ 391 392# Flat Image Tree (FIT) 393# This allows for packaging of a kernel and all devicetrees files, using 394# compression. 395# --------------------------------------------------------------------------- 396 397MAKE_FIT := $(srctree)/scripts/make_fit.py 398 399# Use this to override the compression algorithm 400FIT_COMPRESSION ?= gzip 401 402quiet_cmd_fit = FIT $@ 403 cmd_fit = $(MAKE_FIT) -o $@ --arch $(UIMAGE_ARCH) --os linux \ 404 --name '$(UIMAGE_NAME)' \ 405 $(if $(findstring 1,$(KBUILD_VERBOSE)),-v) \ 406 $(if $(FIT_DECOMPOSE_DTBS),--decompose-dtbs) \ 407 --compress $(FIT_COMPRESSION) -k $< @$(word 2,$^) 408 409# XZ 410# --------------------------------------------------------------------------- 411# Use xzkern or xzkern_with_size to compress the kernel image and xzmisc to 412# compress other things. 413# 414# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 415# of the kernel decompressor. A BCJ filter is used if it is available for 416# the target architecture. 417# 418# xzkern_with_size also appends uncompressed size of the data using 419# size_append. The .xz format has the size information available at the end 420# of the file too, but it's in more complex format and it's good to avoid 421# changing the part of the boot code that reads the uncompressed size. 422# Note that the bytes added by size_append will make the xz tool think that 423# the file is corrupt. This is expected. 424# 425# xzmisc doesn't use size_append, so it can be used to create normal .xz 426# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 427# big dictionary would increase the memory usage too much in the multi-call 428# decompression mode. A BCJ filter isn't used either. 429quiet_cmd_xzkern = XZKERN $@ 430 cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@ 431 432quiet_cmd_xzkern_with_size = XZKERN $@ 433 cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \ 434 $(size_append); } > $@ 435 436quiet_cmd_xzmisc = XZMISC $@ 437 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@ 438 439# ZSTD 440# --------------------------------------------------------------------------- 441# Appends the uncompressed size of the data using size_append. The .zst 442# format has the size information available at the beginning of the file too, 443# but it's in a more complex format and it's good to avoid changing the part 444# of the boot code that reads the uncompressed size. 445# 446# Note that the bytes added by size_append will make the zstd tool think that 447# the file is corrupt. This is expected. 448# 449# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of 450# 128 MB. zstd22 is used for kernel compression because it is decompressed in a 451# single pass, so zstd doesn't need to allocate a window buffer. When streaming 452# decompression is used, like initramfs decompression, zstd22 should likely not 453# be used because it would require zstd to allocate a 128 MB buffer. 454 455quiet_cmd_zstd = ZSTD $@ 456 cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@ 457 458quiet_cmd_zstd22 = ZSTD22 $@ 459 cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@ 460 461quiet_cmd_zstd22_with_size = ZSTD22 $@ 462 cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@ 463 464# ASM offsets 465# --------------------------------------------------------------------------- 466 467# Default sed regexp - multiline due to syntax constraints 468# 469# Use [:space:] because LLVM's integrated assembler inserts <tab> around 470# the .ascii directive whereas GCC keeps the <space> as-is. 471define sed-offsets 472 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ 473 /^->/{s:->#\(.*\):/* \1 */:; \ 474 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ 475 s:->::; p;}' 476endef 477 478# Use filechk to avoid rebuilds when a header changes, but the resulting file 479# does not 480define filechk_offsets 481 echo "#ifndef $2"; \ 482 echo "#define $2"; \ 483 echo "/*"; \ 484 echo " * DO NOT MODIFY."; \ 485 echo " *"; \ 486 echo " * This file was generated by Kbuild"; \ 487 echo " */"; \ 488 echo ""; \ 489 sed -ne $(sed-offsets) < $<; \ 490 echo ""; \ 491 echo "#endif" 492endef 493