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) $(userprogs-always-m)
79 # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
80 dtb-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
82 # Composite DTB (i.e. DTB constructed by overlay)
83 multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs)
84 # Primitive DTB compiled from *.dts
85 real-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs)
86 # Base DTB that overlay is applied onto (each first word of $(*-dtbs) expansion)
87 base-dtb-y := $(foreach m, $(multi-dtb-y), $(firstword $(call suffix-search, $m, .dtb, -dtbs)))
93 extra-y := $(addprefix $(obj)/,$(extra-y))
94 always-y := $(addprefix $(obj)/,$(always-y))
95 targets := $(addprefix $(obj)/,$(targets))
96 obj-m := $(addprefix $(obj)/,$(obj-m))
97 lib-y := $(addprefix $(obj)/,$(lib-y))
98 real-obj-y := $(addprefix $(obj)/,$(real-obj-y))
99 real-obj-m := $(addprefix $(obj)/,$(real-obj-m))
100 multi-obj-m := $(addprefix $(obj)/, $(multi-obj-m))
101 multi-dtb-y := $(addprefix $(obj)/, $(multi-dtb-y))
102 real-dtb-y := $(addprefix $(obj)/, $(real-dtb-y))
103 subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
105 # Finds the multi-part object the current object will be linked into.
106 # If the object belongs to two or more multi-part objects, list them all.
107 modname-multi = $(sort $(foreach m,$(multi-obj-ym),\
108 $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=))))
110 __modname = $(or $(modname-multi),$(basetarget))
112 modname = $(subst $(space),:,$(__modname))
113 modfile = $(addprefix $(obj)/,$(__modname))
115 # target with $(obj)/ and its suffix stripped
116 target-stem = $(basename $(patsubst $(obj)/%,%,$@))
118 # These flags are needed for modversions and compiling, so we define them here
119 # $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
120 # end up in (or would, if it gets compiled in)
121 name-fix-token = $(subst $(comma),_,$(subst -,_,$1))
122 name-fix = $(call stringify,$(call name-fix-token,$1))
123 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
124 modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \
125 -D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname))
126 modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile))
128 _c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
129 $(filter-out $(ccflags-remove-y), \
130 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \
131 $(CFLAGS_$(target-stem).o))
132 _rust_flags = $(filter-out $(RUSTFLAGS_REMOVE_$(target-stem).o), \
133 $(filter-out $(rustflags-remove-y), \
134 $(KBUILD_RUSTFLAGS) $(rustflags-y)) \
135 $(RUSTFLAGS_$(target-stem).o))
136 _a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \
137 $(filter-out $(asflags-remove-y), \
138 $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \
139 $(AFLAGS_$(target-stem).o))
140 _cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
143 # Enable gcov profiling flags for a file, directory or for all files depending
144 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
147 ifeq ($(CONFIG_GCOV_KERNEL),y)
148 _c_flags += $(if $(patsubst n%,, \
149 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
154 # Enable address sanitizer flags for kernel except some files or directories
155 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
157 ifeq ($(CONFIG_KASAN),y)
158 ifneq ($(CONFIG_KASAN_HW_TAGS),y)
159 _c_flags += $(if $(patsubst n%,, \
160 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
161 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
165 ifeq ($(CONFIG_UBSAN),y)
166 _c_flags += $(if $(patsubst n%,, \
167 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
171 ifeq ($(CONFIG_KCOV),y)
172 _c_flags += $(if $(patsubst n%,, \
173 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
178 # Enable KCSAN flags except some files or directories we don't want to check
179 # (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
181 ifeq ($(CONFIG_KCSAN),y)
182 _c_flags += $(if $(patsubst n%,, \
183 $(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \
185 # Some uninstrumented files provide implied barriers required to avoid false
186 # positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only.
187 _c_flags += $(if $(patsubst n%,, \
188 $(KCSAN_INSTRUMENT_BARRIERS_$(basetarget).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \
189 -D__KCSAN_INSTRUMENT_BARRIERS__)
192 # $(srctree)/$(src) for including checkin headers from generated source files
193 # $(objtree)/$(obj) for including generated headers from checkin source files
194 ifeq ($(KBUILD_EXTMOD),)
195 ifdef building_out_of_srctree
196 _c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
197 _a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
198 _cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
202 part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
203 quiet_modtag = $(if $(part-of-module),[M], )
206 $(if $(part-of-module), \
207 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
208 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
210 modkern_rustflags = \
211 $(if $(part-of-module), \
212 $(KBUILD_RUSTFLAGS_MODULE) $(RUSTFLAGS_MODULE), \
213 $(KBUILD_RUSTFLAGS_KERNEL) $(RUSTFLAGS_KERNEL))
215 modkern_aflags = $(if $(part-of-module), \
216 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
217 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
219 c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
220 -include $(srctree)/include/linux/compiler_types.h \
221 $(_c_flags) $(modkern_cflags) \
222 $(basename_flags) $(modname_flags)
224 rust_flags = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg
226 a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
227 $(_a_flags) $(modkern_aflags)
229 cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
232 ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
234 DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
236 dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc \
237 $(addprefix -I,$(DTC_INCLUDE)) \
242 objtool := $(objtree)/tools/objtool/objtool
245 $(if $(CONFIG_HAVE_JUMP_LABEL_HACK), --hacks=jump_label) \
246 $(if $(CONFIG_HAVE_NOINSTR_HACK), --hacks=noinstr) \
247 $(if $(CONFIG_X86_KERNEL_IBT), --ibt) \
248 $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount) \
249 $(if $(CONFIG_UNWINDER_ORC), --orc) \
250 $(if $(CONFIG_RETPOLINE), --retpoline) \
251 $(if $(CONFIG_RETHUNK), --rethunk) \
252 $(if $(CONFIG_SLS), --sls) \
253 $(if $(CONFIG_STACK_VALIDATION), --stackval) \
254 $(if $(CONFIG_HAVE_STATIC_CALL_INLINE), --static-call) \
255 $(if $(CONFIG_HAVE_UACCESS_VALIDATION), --uaccess) \
256 $(if $(delay-objtool), --link) \
257 $(if $(part-of-module), --module) \
258 $(if $(CONFIG_GCOV_KERNEL), --no-unreachable)
260 delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT))
262 cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool_args) $@)
263 cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
265 endif # CONFIG_OBJTOOL
267 # Useful for describing the dependency of composite objects
269 # $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
273 $(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3))))
277 # ===========================================================================
278 # 'cp' preserves permissions. If you use it to copy a file in read-only srctree,
279 # the copy would be read-only as well, leading to an error when executing the
280 # rule next time. Use 'cat' instead in order to generate a writable file.
281 quiet_cmd_copy = COPY $@
282 cmd_copy = cat $< > $@
284 $(obj)/%: $(src)/%_shipped
287 # Commands useful for building a boot image
288 # ===========================================================================
292 # target: source(s) FORCE
293 # $(if_changed,ld/objcopy/gzip)
295 # and add target to 'targets' so that we know we have to
296 # read in the saved command line
299 # ---------------------------------------------------------------------------
302 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
305 # ---------------------------------------------------------------------------
308 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
311 # ---------------------------------------------------------------------------
313 quiet_cmd_objcopy = OBJCOPY $@
314 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
317 # ---------------------------------------------------------------------------
319 quiet_cmd_gzip = GZIP $@
320 cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@
323 # ---------------------------------------------------------------------------
324 DTC ?= $(objtree)/scripts/dtc/dtc
325 DTC_FLAGS += -Wno-interrupt_provider
327 # Disable noisy checks by default
328 ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
329 DTC_FLAGS += -Wno-unit_address_vs_reg \
330 -Wno-avoid_unnecessary_addr_size \
332 -Wno-graph_child_address \
333 -Wno-simple_bus_reg \
334 -Wno-unique_unit_address
337 ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
338 DTC_FLAGS += -Wnode_name_chars_strict \
339 -Wproperty_name_chars_strict \
343 DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
345 # Set -@ if the target is a base DTB that overlay is applied onto
346 DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@)
348 # Generate an assembly file to wrap the output of the device tree compiler
349 quiet_cmd_dt_S_dtb= DTB $@
352 echo '\#include <asm-generic/vmlinux.lds.h>'; \
353 echo '.section .dtb.init.rodata,"a"'; \
354 echo '.balign STRUCT_ALIGNMENT'; \
355 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
356 echo '__dtb_$(subst -,_,$(*F))_begin:'; \
357 echo '.incbin "$<" '; \
358 echo '__dtb_$(subst -,_,$(*F))_end:'; \
359 echo '.global __dtb_$(subst -,_,$(*F))_end'; \
360 echo '.balign STRUCT_ALIGNMENT'; \
363 $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
364 $(call if_changed,dt_S_dtb)
366 quiet_cmd_dtc = DTC $@
367 cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
369 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
370 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
371 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
373 quiet_cmd_fdtoverlay = DTOVL $@
374 cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(real-prereqs)
376 $(multi-dtb-y): FORCE
377 $(call if_changed,fdtoverlay)
378 $(call multi_depend, $(multi-dtb-y), .dtb, -dtbs)
380 ifneq ($(CHECK_DTBS)$(CHECK_DT_BINDING),)
381 DT_CHECKER ?= dt-validate
382 DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)
383 DT_BINDING_DIR := Documentation/devicetree/bindings
384 DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json
386 quiet_cmd_dtb_check = CHECK $@
387 cmd_dtb_check = $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true
391 $(call cmd_and_fixdep,dtc)
392 $(call cmd,dtb_check)
395 $(obj)/%.dtb: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
396 $(call if_changed_rule,dtc)
398 $(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
399 $(call if_changed_dep,dtc)
401 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
404 # ---------------------------------------------------------------------------
406 # Bzip2 and LZMA do not include size in file... so we have to fake that;
407 # append the size as a 32-bit littleendian number as gzip does.
408 size_append = printf $(shell \
410 for F in $(real-prereqs); do \
411 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
412 dec_size=$$(expr $$dec_size + $$fsize); \
414 printf "%08x\n" $$dec_size | \
415 sed 's/\(..\)/\1 /g' | { \
416 read ch0 ch1 ch2 ch3; \
417 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
418 printf '%s%03o' '\\' $$((0x$$ch)); \
423 quiet_cmd_file_size = GEN $@
424 cmd_file_size = $(size_append) > $@
426 quiet_cmd_bzip2 = BZIP2 $@
427 cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@
429 quiet_cmd_bzip2_with_size = BZIP2 $@
430 cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@
433 # ---------------------------------------------------------------------------
435 quiet_cmd_lzma = LZMA $@
436 cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@
438 quiet_cmd_lzma_with_size = LZMA $@
439 cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@
441 quiet_cmd_lzo = LZO $@
442 cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@
444 quiet_cmd_lzo_with_size = LZO $@
445 cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
447 quiet_cmd_lz4 = LZ4 $@
448 cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout > $@
450 quiet_cmd_lz4_with_size = LZ4 $@
451 cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \
452 $(size_append); } > $@
455 # ---------------------------------------------------------------------------
457 MKIMAGE := $(srctree)/scripts/mkuboot.sh
459 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
460 # the number of overrides in arch makefiles
461 UIMAGE_ARCH ?= $(SRCARCH)
462 UIMAGE_COMPRESSION ?= $(or $(2),none)
464 UIMAGE_TYPE ?= kernel
465 UIMAGE_LOADADDR ?= arch_must_set_this
466 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
467 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
469 quiet_cmd_uimage = UIMAGE $@
470 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
471 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
473 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
474 -n $(UIMAGE_NAME) -d $< $@
477 # ---------------------------------------------------------------------------
478 # Use xzkern to compress the kernel image and xzmisc to compress other things.
480 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
481 # of the kernel decompressor. A BCJ filter is used if it is available for
482 # the target architecture. xzkern also appends uncompressed size of the data
483 # using size_append. The .xz format has the size information available at
484 # the end of the file too, but it's in more complex format and it's good to
485 # avoid 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) < $<; \