1 # SPDX-License-Identifier: GPL-2.0
2 # Backward compatibility
3 asflags-y += $(EXTRA_AFLAGS)
4 ccflags-y += $(EXTRA_CFLAGS)
5 cppflags-y += $(EXTRA_CPPFLAGS)
6 ldflags-y += $(EXTRA_LDFLAGS)
8 # flags that take effect in current and sub directories
9 KBUILD_AFLAGS += $(subdir-asflags-y)
10 KBUILD_CFLAGS += $(subdir-ccflags-y)
11 KBUILD_RUSTFLAGS += $(subdir-rustflags-y)
13 # Figure out what we need to build from the various variables
14 # ===========================================================================
16 # When an object is listed to be built compiled-in and modular,
17 # only build the compiled-in version
18 obj-m := $(filter-out $(obj-y),$(obj-m))
20 # Libraries are always collected in one lib file.
21 # Filter out objects already built-in
22 lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
24 # Subdirectories we need to descend into
25 subdir-ym := $(sort $(subdir-y) $(subdir-m) \
26 $(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m))))
28 # Handle objects in subdirs:
29 # - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and
31 # - If we encounter foo/ in $(obj-m), replace it by foo/modules.order
33 # Generate modules.order to determine modorder. Unfortunately, we don't have
34 # information about ordering between -y and -m subdirs. Just put -y's first.
37 obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m))
39 obj-m := $(filter-out %/, $(obj-m))
43 obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
45 obj-y := $(filter-out %/, $(obj-y))
48 # Expand $(foo-objs) $(foo-y) etc. by replacing their individuals
49 suffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s))))
50 # List composite targets that are constructed by combining other targets
51 multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m)))
52 # List primitive targets that are compiled from source files
53 real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m))
55 # If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
56 multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y)
57 multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m)
58 multi-obj-ym := $(multi-obj-y) $(multi-obj-m)
60 # Replace multi-part objects by their individual parts,
61 # including built-in.a from subdirectories
62 real-obj-y := $(call real-search, $(obj-y), .o, -objs -y)
63 real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m)
65 always-y += $(always-m)
67 # hostprogs-always-y += foo
68 # ... is a shorthand for
71 hostprogs += $(hostprogs-always-y) $(hostprogs-always-m)
72 always-y += $(hostprogs-always-y) $(hostprogs-always-m)
74 # userprogs-always-y is likewise.
75 userprogs += $(userprogs-always-y) $(userprogs-always-m)
76 always-y += $(userprogs-always-y) $(userprogs-always-m)
81 extra-y := $(addprefix $(obj)/,$(extra-y))
82 always-y := $(addprefix $(obj)/,$(always-y))
83 targets := $(addprefix $(obj)/,$(targets))
84 obj-m := $(addprefix $(obj)/,$(obj-m))
85 lib-y := $(addprefix $(obj)/,$(lib-y))
86 real-obj-y := $(addprefix $(obj)/,$(real-obj-y))
87 real-obj-m := $(addprefix $(obj)/,$(real-obj-m))
88 multi-obj-m := $(addprefix $(obj)/, $(multi-obj-m))
89 subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
92 # Finds the multi-part object the current object will be linked into.
93 # If the object belongs to two or more multi-part objects, list them all.
94 modname-multi = $(sort $(foreach m,$(multi-obj-ym),\
95 $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=))))
97 __modname = $(or $(modname-multi),$(basetarget))
99 modname = $(subst $(space),:,$(__modname))
100 modfile = $(addprefix $(obj)/,$(__modname))
102 # target with $(obj)/ and its suffix stripped
103 target-stem = $(basename $(patsubst $(obj)/%,%,$@))
105 # These flags are needed for modversions and compiling, so we define them here
106 # $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
107 # end up in (or would, if it gets compiled in)
108 name-fix-token = $(subst $(comma),_,$(subst -,_,$1))
109 name-fix = $(call stringify,$(call name-fix-token,$1))
110 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
111 modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \
112 -D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname))
113 modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile))
115 _c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
116 $(filter-out $(ccflags-remove-y), \
117 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \
118 $(CFLAGS_$(target-stem).o))
119 _rust_flags = $(filter-out $(RUSTFLAGS_REMOVE_$(target-stem).o), \
120 $(filter-out $(rustflags-remove-y), \
121 $(KBUILD_RUSTFLAGS) $(rustflags-y)) \
122 $(RUSTFLAGS_$(target-stem).o))
123 _a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \
124 $(filter-out $(asflags-remove-y), \
125 $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \
126 $(AFLAGS_$(target-stem).o))
127 _cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
130 # Enable gcov profiling flags for a file, directory or for all files depending
131 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
134 ifeq ($(CONFIG_GCOV_KERNEL),y)
135 _c_flags += $(if $(patsubst n%,, \
136 $(GCOV_PROFILE_$(target-stem).o)$(GCOV_PROFILE)$(if $(is-kernel-object),$(CONFIG_GCOV_PROFILE_ALL))), \
141 # Enable address sanitizer flags for kernel except some files or directories
142 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
144 ifeq ($(CONFIG_KASAN),y)
145 ifneq ($(CONFIG_KASAN_HW_TAGS),y)
146 _c_flags += $(if $(patsubst n%,, \
147 $(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \
148 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
149 _rust_flags += $(if $(patsubst n%,, \
150 $(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \
155 ifeq ($(CONFIG_KMSAN),y)
156 _c_flags += $(if $(patsubst n%,, \
157 $(KMSAN_SANITIZE_$(target-stem).o)$(KMSAN_SANITIZE)$(is-kernel-object)), \
159 _c_flags += $(if $(patsubst n%,, \
160 $(KMSAN_ENABLE_CHECKS_$(target-stem).o)$(KMSAN_ENABLE_CHECKS)$(is-kernel-object)), \
161 , -mllvm -msan-disable-checks=1)
164 ifeq ($(CONFIG_UBSAN),y)
165 _c_flags += $(if $(patsubst n%,, \
166 $(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_SANITIZE)$(is-kernel-object)), \
168 _c_flags += $(if $(patsubst n%,, \
169 $(UBSAN_SIGNED_WRAP_$(target-stem).o)$(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_SIGNED_WRAP)$(UBSAN_SANITIZE)$(is-kernel-object)), \
170 $(CFLAGS_UBSAN_SIGNED_WRAP))
173 ifeq ($(CONFIG_KCOV),y)
174 _c_flags += $(if $(patsubst n%,, \
175 $(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \
180 # Enable KCSAN flags except some files or directories we don't want to check
181 # (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
183 ifeq ($(CONFIG_KCSAN),y)
184 _c_flags += $(if $(patsubst n%,, \
185 $(KCSAN_SANITIZE_$(target-stem).o)$(KCSAN_SANITIZE)$(is-kernel-object)), \
187 # Some uninstrumented files provide implied barriers required to avoid false
188 # positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only.
189 _c_flags += $(if $(patsubst n%,, \
190 $(KCSAN_INSTRUMENT_BARRIERS_$(target-stem).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \
191 -D__KCSAN_INSTRUMENT_BARRIERS__)
195 # Enable AutoFDO build flags except some files or directories we don't want to
196 # enable (depends on variables AUTOFDO_PROFILE_obj.o and AUTOFDO_PROFILE).
198 ifeq ($(CONFIG_AUTOFDO_CLANG),y)
199 _c_flags += $(if $(patsubst n%,, \
200 $(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(is-kernel-object)), \
201 $(CFLAGS_AUTOFDO_CLANG))
205 # Enable Propeller build flags except some files or directories we don't want to
206 # enable (depends on variables AUTOFDO_PROPELLER_obj.o and PROPELLER_PROFILE).
208 ifdef CONFIG_PROPELLER_CLANG
209 _c_flags += $(if $(patsubst n%,, \
210 $(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(PROPELLER_PROFILE))$(is-kernel-object), \
211 $(CFLAGS_PROPELLER_CLANG))
214 # $(src) for including checkin headers from generated source files
215 # $(obj) for including generated headers from checkin source files
216 ifdef building_out_of_srctree
217 _c_flags += $(addprefix -I, $(src) $(obj))
218 _a_flags += $(addprefix -I, $(src) $(obj))
219 _cpp_flags += $(addprefix -I, $(src) $(obj))
222 # If $(is-kernel-object) is 'y', this object will be linked to vmlinux or modules
223 is-kernel-object = $(or $(part-of-builtin),$(part-of-module))
225 part-of-builtin = $(if $(filter $(basename $@).o, $(real-obj-y) $(lib-y)),y)
226 part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
227 quiet_modtag = $(if $(part-of-module),[M], )
230 $(if $(part-of-module), \
231 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
232 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
234 modkern_rustflags = \
235 $(if $(part-of-module), \
236 $(KBUILD_RUSTFLAGS_MODULE) $(RUSTFLAGS_MODULE), \
237 $(KBUILD_RUSTFLAGS_KERNEL) $(RUSTFLAGS_KERNEL))
239 modkern_aflags = $(if $(part-of-module), \
240 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
241 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) $(modfile_flags))
243 c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
244 -include $(srctree)/include/linux/compiler_types.h \
245 $(_c_flags) $(modkern_cflags) \
246 $(basename_flags) $(modname_flags)
248 rust_flags = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg
250 a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
251 $(_a_flags) $(modkern_aflags) $(modname_flags)
253 cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
256 ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
260 objtool := $(objtree)/tools/objtool/objtool
262 objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) += --hacks=jump_label
263 objtool-args-$(CONFIG_HAVE_NOINSTR_HACK) += --hacks=noinstr
264 objtool-args-$(CONFIG_MITIGATION_CALL_DEPTH_TRACKING) += --hacks=skylake
265 objtool-args-$(CONFIG_X86_KERNEL_IBT) += --ibt
266 objtool-args-$(CONFIG_FINEIBT) += --cfi
267 objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL) += --mcount
268 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
269 objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT) += --mnop
271 objtool-args-$(CONFIG_UNWINDER_ORC) += --orc
272 objtool-args-$(CONFIG_MITIGATION_RETPOLINE) += --retpoline
273 objtool-args-$(CONFIG_MITIGATION_RETHUNK) += --rethunk
274 objtool-args-$(CONFIG_MITIGATION_SLS) += --sls
275 objtool-args-$(CONFIG_STACK_VALIDATION) += --stackval
276 objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE) += --static-call
277 objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION) += --uaccess
278 objtool-args-$(CONFIG_GCOV_KERNEL) += --no-unreachable
279 objtool-args-$(CONFIG_PREFIX_SYMBOLS) += --prefix=$(CONFIG_FUNCTION_PADDING_BYTES)
281 objtool-args = $(objtool-args-y) \
282 $(if $(delay-objtool), --link) \
283 $(if $(part-of-module), --module)
285 delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT))
287 cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool-args) $@)
288 cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
290 endif # CONFIG_OBJTOOL
292 # Useful for describing the dependency of composite objects
294 # $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
298 $(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3))))
302 # ===========================================================================
303 # These are shared by some Makefile.* files.
307 ifdef CONFIG_LTO_CLANG
308 # objtool cannot process LLVM IR. Make $(LD) covert LLVM IR to ELF here.
309 cmd_ld_single = $(if $(objtool-enabled), ; $(LD) $(ld_flags) -r -o $(tmp-target) $@; mv $(tmp-target) $@)
312 quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
313 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< \
318 $(call cmd_and_fixdep,cc_o_c)
321 $(call cmd,gen_objtooldep)
322 $(call cmd,gen_symversions_c)
323 $(call cmd,record_mcount)
324 $(call cmd,warn_shared_object)
327 quiet_cmd_as_o_S = AS $(quiet_modtag) $@
328 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool)
331 $(call cmd_and_fixdep,as_o_S)
332 $(call cmd,gen_objtooldep)
333 $(call cmd,gen_symversions_S)
334 $(call cmd,warn_shared_object)
338 # ===========================================================================
339 # 'cp' preserves permissions. If you use it to copy a file in read-only srctree,
340 # the copy would be read-only as well, leading to an error when executing the
341 # rule next time. Use 'cat' instead in order to generate a writable file.
342 quiet_cmd_copy = COPY $@
343 cmd_copy = cat $< > $@
345 $(obj)/%: $(src)/%_shipped
348 # Commands useful for building a boot image
349 # ===========================================================================
353 # target: source(s) FORCE
354 # $(if_changed,ld/objcopy/gzip)
356 # and add target to 'targets' so that we know we have to
357 # read in the saved command line
360 # ---------------------------------------------------------------------------
363 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
366 # ---------------------------------------------------------------------------
369 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
372 # ---------------------------------------------------------------------------
374 quiet_cmd_objcopy = OBJCOPY $@
375 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
378 # ---------------------------------------------------------------------------
380 quiet_cmd_gzip = GZIP $@
381 cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@
384 # ---------------------------------------------------------------------------
386 # Bzip2 and LZMA do not include size in file... so we have to fake that;
387 # append the size as a 32-bit littleendian number as gzip does.
388 size_append = printf $(shell \
390 for F in $(real-prereqs); do \
391 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
392 dec_size=$$(expr $$dec_size + $$fsize); \
394 printf "%08x\n" $$dec_size | \
395 sed 's/\(..\)/\1 /g' | { \
396 read ch0 ch1 ch2 ch3; \
397 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
398 printf '%s%03o' '\\' $$((0x$$ch)); \
403 quiet_cmd_file_size = GEN $@
404 cmd_file_size = $(size_append) > $@
406 quiet_cmd_bzip2 = BZIP2 $@
407 cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@
409 quiet_cmd_bzip2_with_size = BZIP2 $@
410 cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@
413 # ---------------------------------------------------------------------------
415 quiet_cmd_lzma = LZMA $@
416 cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@
418 quiet_cmd_lzma_with_size = LZMA $@
419 cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@
421 quiet_cmd_lzo = LZO $@
422 cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@
424 quiet_cmd_lzo_with_size = LZO $@
425 cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
427 quiet_cmd_lz4 = LZ4 $@
428 cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -9 - - > $@
430 quiet_cmd_lz4_with_size = LZ4 $@
431 cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -9 - -; \
432 $(size_append); } > $@
435 # ---------------------------------------------------------------------------
437 MKIMAGE := $(srctree)/scripts/mkuboot.sh
439 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
440 # the number of overrides in arch makefiles
441 UIMAGE_ARCH ?= $(SRCARCH)
442 UIMAGE_COMPRESSION ?= $(or $(2),none)
444 UIMAGE_TYPE ?= kernel
445 UIMAGE_LOADADDR ?= arch_must_set_this
446 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
447 UIMAGE_NAME ?= Linux-$(KERNELRELEASE)
449 quiet_cmd_uimage = UIMAGE $@
450 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
451 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
453 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
454 -n '$(UIMAGE_NAME)' -d $< $@
456 # Flat Image Tree (FIT)
457 # This allows for packaging of a kernel and all devicetrees files, using
459 # ---------------------------------------------------------------------------
461 MAKE_FIT := $(srctree)/scripts/make_fit.py
463 # Use this to override the compression algorithm
464 FIT_COMPRESSION ?= gzip
466 quiet_cmd_fit = FIT $@
467 cmd_fit = $(MAKE_FIT) -o $@ --arch $(UIMAGE_ARCH) --os linux \
468 --name '$(UIMAGE_NAME)' \
469 $(if $(findstring 1,$(KBUILD_VERBOSE)),-v) \
470 $(if $(FIT_DECOMPOSE_DTBS),--decompose-dtbs) \
471 --compress $(FIT_COMPRESSION) -k $< @$(word 2,$^)
474 # ---------------------------------------------------------------------------
475 # Use xzkern or xzkern_with_size to compress the kernel image and xzmisc to
476 # compress other things.
478 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
479 # of the kernel decompressor. A BCJ filter is used if it is available for
480 # the target architecture.
482 # xzkern_with_size also appends uncompressed size of the data using
483 # size_append. The .xz format has the size information available at the end
484 # of the file too, but it's in more complex format and it's good to avoid
485 # changing the part of the boot code that reads the uncompressed size.
486 # Note that the bytes added by size_append will make the xz tool think that
487 # the file is corrupt. This is expected.
489 # xzmisc doesn't use size_append, so it can be used to create normal .xz
490 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
491 # big dictionary would increase the memory usage too much in the multi-call
492 # decompression mode. A BCJ filter isn't used either.
493 quiet_cmd_xzkern = XZKERN $@
494 cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@
496 quiet_cmd_xzkern_with_size = XZKERN $@
497 cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
498 $(size_append); } > $@
500 quiet_cmd_xzmisc = XZMISC $@
501 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
504 # ---------------------------------------------------------------------------
505 # Appends the uncompressed size of the data using size_append. The .zst
506 # format has the size information available at the beginning of the file too,
507 # but it's in a more complex format and it's good to avoid changing the part
508 # of the boot code that reads the uncompressed size.
510 # Note that the bytes added by size_append will make the zstd tool think that
511 # the file is corrupt. This is expected.
513 # zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of
514 # 128 MB. zstd22 is used for kernel compression because it is decompressed in a
515 # single pass, so zstd doesn't need to allocate a window buffer. When streaming
516 # decompression is used, like initramfs decompression, zstd22 should likely not
517 # be used because it would require zstd to allocate a 128 MB buffer.
519 quiet_cmd_zstd = ZSTD $@
520 cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@
522 quiet_cmd_zstd22 = ZSTD22 $@
523 cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@
525 quiet_cmd_zstd22_with_size = ZSTD22 $@
526 cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
529 # ---------------------------------------------------------------------------
531 # Default sed regexp - multiline due to syntax constraints
533 # Use [:space:] because LLVM's integrated assembler inserts <tab> around
534 # the .ascii directive whereas GCC keeps the <space> as-is.
536 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
537 /^->/{s:->#\(.*\):/* \1 */:; \
538 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
542 # Use filechk to avoid rebuilds when a header changes, but the resulting file
544 define filechk_offsets
548 echo " * DO NOT MODIFY."; \
550 echo " * This file was generated by Kbuild"; \
553 sed -ne $(sed-offsets) < $<; \