xref: /linux/scripts/Makefile.lib (revision 5c8166419acf468b5bc3e48f928a040485d3e0c2)
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) etc. by replacing their individuals
48suffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s))))
49# List composite targets that are constructed by combining other targets
50multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m)))
51# List primitive targets that are compiled from source files
52real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m))
53
54# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
55multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y)
56multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m)
57multi-obj-ym := $(multi-obj-y) $(multi-obj-m)
58
59# Replace multi-part objects by their individual parts,
60# including built-in.a from subdirectories
61real-obj-y := $(call real-search, $(obj-y), .o, -objs -y)
62real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m)
63
64always-y += $(always-m)
65
66# hostprogs-always-y += foo
67# ... is a shorthand for
68# hostprogs += foo
69# always-y  += foo
70hostprogs += $(hostprogs-always-y) $(hostprogs-always-m)
71always-y += $(hostprogs-always-y) $(hostprogs-always-m)
72
73# userprogs-always-y is likewise.
74userprogs += $(userprogs-always-y) $(userprogs-always-m)
75always-y += $(userprogs-always-y) $(userprogs-always-m)
76
77# DTB
78# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
79dtb-$(CONFIG_OF_ALL_DTBS)       += $(dtb-)
80
81# Composite DTB (i.e. DTB constructed by overlay)
82multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs)
83# Primitive DTB compiled from *.dts
84real-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs)
85# Base DTB that overlay is applied onto (each first word of $(*-dtbs) expansion)
86base-dtb-y := $(foreach m, $(multi-dtb-y), $(firstword $(call suffix-search, $m, .dtb, -dtbs)))
87
88always-y			+= $(dtb-y)
89
90ifneq ($(CHECK_DTBS),)
91always-y += $(patsubst %.dtb,%.dt.yaml, $(real-dtb-y))
92always-y += $(patsubst %.dtbo,%.dt.yaml, $(real-dtb-y))
93endif
94
95# Add subdir path
96
97extra-y		:= $(addprefix $(obj)/,$(extra-y))
98always-y	:= $(addprefix $(obj)/,$(always-y))
99targets		:= $(addprefix $(obj)/,$(targets))
100obj-m		:= $(addprefix $(obj)/,$(obj-m))
101lib-y		:= $(addprefix $(obj)/,$(lib-y))
102real-obj-y	:= $(addprefix $(obj)/,$(real-obj-y))
103real-obj-m	:= $(addprefix $(obj)/,$(real-obj-m))
104multi-obj-m	:= $(addprefix $(obj)/, $(multi-obj-m))
105multi-dtb-y	:= $(addprefix $(obj)/, $(multi-dtb-y))
106real-dtb-y	:= $(addprefix $(obj)/, $(real-dtb-y))
107subdir-ym	:= $(addprefix $(obj)/,$(subdir-ym))
108
109# Finds the multi-part object the current object will be linked into.
110# If the object belongs to two or more multi-part objects, list them all.
111modname-multi = $(sort $(foreach m,$(multi-obj-ym),\
112		$(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=))))
113
114__modname = $(or $(modname-multi),$(basetarget))
115
116modname = $(subst $(space),:,$(__modname))
117modfile = $(addprefix $(obj)/,$(__modname))
118
119# target with $(obj)/ and its suffix stripped
120target-stem = $(basename $(patsubst $(obj)/%,%,$@))
121
122# These flags are needed for modversions and compiling, so we define them here
123# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
124# end up in (or would, if it gets compiled in)
125name-fix-token = $(subst $(comma),_,$(subst -,_,$1))
126name-fix = $(call stringify,$(call name-fix-token,$1))
127basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
128modname_flags  = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \
129		 -D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname))
130modfile_flags  = -DKBUILD_MODFILE=$(call stringify,$(modfile))
131
132_c_flags       = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
133                     $(filter-out $(ccflags-remove-y), \
134                         $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \
135                     $(CFLAGS_$(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)
141
142#
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
145# (in this order)
146#
147ifeq ($(CONFIG_GCOV_KERNEL),y)
148_c_flags += $(if $(patsubst n%,, \
149		$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
150		$(CFLAGS_GCOV))
151endif
152
153#
154# Enable address sanitizer flags for kernel except some files or directories
155# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
156#
157ifeq ($(CONFIG_KASAN),y)
158ifneq ($(CONFIG_KASAN_HW_TAGS),y)
159_c_flags += $(if $(patsubst n%,, \
160		$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
161		$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
162endif
163endif
164
165ifeq ($(CONFIG_UBSAN),y)
166_c_flags += $(if $(patsubst n%,, \
167		$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
168		$(CFLAGS_UBSAN))
169endif
170
171ifeq ($(CONFIG_KCOV),y)
172_c_flags += $(if $(patsubst n%,, \
173	$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
174	$(CFLAGS_KCOV))
175endif
176
177#
178# Enable KCSAN flags except some files or directories we don't want to check
179# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
180#
181ifeq ($(CONFIG_KCSAN),y)
182_c_flags += $(if $(patsubst n%,, \
183	$(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \
184	$(CFLAGS_KCSAN))
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__)
190endif
191
192# $(srctree)/$(src) for including checkin headers from generated source files
193# $(objtree)/$(obj) for including generated headers from checkin source files
194ifeq ($(KBUILD_EXTMOD),)
195ifdef 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)
199endif
200endif
201
202part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
203quiet_modtag = $(if $(part-of-module),[M],   )
204
205modkern_cflags =                                          \
206	$(if $(part-of-module),                           \
207		$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
208		$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
209
210modkern_aflags = $(if $(part-of-module),				\
211			$(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE),	\
212			$(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
213
214c_flags        = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
215		 -include $(srctree)/include/linux/compiler_types.h       \
216		 $(_c_flags) $(modkern_cflags)                           \
217		 $(basename_flags) $(modname_flags)
218
219a_flags        = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
220		 $(_a_flags) $(modkern_aflags)
221
222cpp_flags      = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
223		 $(_cpp_flags)
224
225ld_flags       = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
226
227DTC_INCLUDE    := $(srctree)/scripts/dtc/include-prefixes
228
229dtc_cpp_flags  = -Wp,-MMD,$(depfile).pre.tmp -nostdinc                    \
230		 $(addprefix -I,$(DTC_INCLUDE))                          \
231		 -undef -D__DTS__
232
233ifeq ($(CONFIG_LTO_CLANG),y)
234# With CONFIG_LTO_CLANG, .o files in modules might be LLVM bitcode, so we
235# need to run LTO to compile them into native code (.lto.o) before further
236# processing.
237mod-prelink-ext := .lto
238endif
239
240# Useful for describing the dependency of composite objects
241# Usage:
242#   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
243define multi_depend
244$(foreach m, $(notdir $1), \
245	$(eval $(obj)/$m: \
246	$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
247endef
248
249# Copy a file
250# ===========================================================================
251# 'cp' preserves permissions. If you use it to copy a file in read-only srctree,
252# the copy would be read-only as well, leading to an error when executing the
253# rule next time. Use 'cat' instead in order to generate a writable file.
254quiet_cmd_copy = COPY    $@
255      cmd_copy = cat $< > $@
256
257$(obj)/%: $(src)/%_shipped
258	$(call cmd,copy)
259
260# Commands useful for building a boot image
261# ===========================================================================
262#
263#	Use as following:
264#
265#	target: source(s) FORCE
266#		$(if_changed,ld/objcopy/gzip)
267#
268#	and add target to 'targets' so that we know we have to
269#	read in the saved command line
270
271# Linking
272# ---------------------------------------------------------------------------
273
274quiet_cmd_ld = LD      $@
275      cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
276
277# Archive
278# ---------------------------------------------------------------------------
279
280quiet_cmd_ar = AR      $@
281      cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
282
283# Objcopy
284# ---------------------------------------------------------------------------
285
286quiet_cmd_objcopy = OBJCOPY $@
287cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
288
289# Gzip
290# ---------------------------------------------------------------------------
291
292quiet_cmd_gzip = GZIP    $@
293      cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@
294
295# DTC
296# ---------------------------------------------------------------------------
297DTC ?= $(objtree)/scripts/dtc/dtc
298DTC_FLAGS += -Wno-interrupt_provider
299
300# Disable noisy checks by default
301ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
302DTC_FLAGS += -Wno-unit_address_vs_reg \
303	-Wno-avoid_unnecessary_addr_size \
304	-Wno-alias_paths \
305	-Wno-graph_child_address \
306	-Wno-simple_bus_reg \
307	-Wno-unique_unit_address
308endif
309
310ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
311DTC_FLAGS += -Wnode_name_chars_strict \
312	-Wproperty_name_chars_strict \
313	-Winterrupt_provider
314endif
315
316DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
317
318# Set -@ if the target is a base DTB that overlay is applied onto
319DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@)
320
321# Generate an assembly file to wrap the output of the device tree compiler
322quiet_cmd_dt_S_dtb= DTB     $@
323cmd_dt_S_dtb=						\
324{							\
325	echo '\#include <asm-generic/vmlinux.lds.h>'; 	\
326	echo '.section .dtb.init.rodata,"a"';		\
327	echo '.balign STRUCT_ALIGNMENT';		\
328	echo '.global __dtb_$(subst -,_,$(*F))_begin';	\
329	echo '__dtb_$(subst -,_,$(*F))_begin:';		\
330	echo '.incbin "$<" ';				\
331	echo '__dtb_$(subst -,_,$(*F))_end:';		\
332	echo '.global __dtb_$(subst -,_,$(*F))_end';	\
333	echo '.balign STRUCT_ALIGNMENT'; 		\
334} > $@
335
336$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
337	$(call if_changed,dt_S_dtb)
338
339quiet_cmd_dtc = DTC     $@
340cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
341	$(DTC) -o $@ -b 0 \
342		$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
343		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
344	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
345
346$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
347	$(call if_changed_dep,dtc)
348
349$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
350	$(call if_changed_dep,dtc)
351
352quiet_cmd_fdtoverlay = DTOVL   $@
353      cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(real-prereqs)
354
355$(multi-dtb-y): FORCE
356	$(call if_changed,fdtoverlay)
357$(call multi_depend, $(multi-dtb-y), .dtb, -dtbs)
358
359DT_CHECKER ?= dt-validate
360DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),,-m)
361DT_BINDING_DIR := Documentation/devicetree/bindings
362# DT_TMP_SCHEMA may be overridden from Documentation/devicetree/bindings/Makefile
363DT_TMP_SCHEMA ?= $(objtree)/$(DT_BINDING_DIR)/processed-schema.json
364
365quiet_cmd_dtb_check =	CHECK   $@
366      cmd_dtb_check =	$(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@
367
368define rule_dtc
369	$(call cmd_and_fixdep,dtc)
370	$(call cmd,dtb_check)
371endef
372
373$(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
374	$(call if_changed_rule,dtc)
375
376dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
377
378# Bzip2
379# ---------------------------------------------------------------------------
380
381# Bzip2 and LZMA do not include size in file... so we have to fake that;
382# append the size as a 32-bit littleendian number as gzip does.
383size_append = printf $(shell						\
384dec_size=0;								\
385for F in $(real-prereqs); do					\
386	fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F);	\
387	dec_size=$$(expr $$dec_size + $$fsize);				\
388done;									\
389printf "%08x\n" $$dec_size |						\
390	sed 's/\(..\)/\1 /g' | {					\
391		read ch0 ch1 ch2 ch3;					\
392		for ch in $$ch3 $$ch2 $$ch1 $$ch0; do			\
393			printf '%s%03o' '\\' $$((0x$$ch)); 		\
394		done;							\
395	}								\
396)
397
398quiet_cmd_file_size = GEN     $@
399      cmd_file_size = $(size_append) > $@
400
401quiet_cmd_bzip2 = BZIP2   $@
402      cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@
403
404quiet_cmd_bzip2_with_size = BZIP2   $@
405      cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@
406
407# Lzma
408# ---------------------------------------------------------------------------
409
410quiet_cmd_lzma = LZMA    $@
411      cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@
412
413quiet_cmd_lzma_with_size = LZMA    $@
414      cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@
415
416quiet_cmd_lzo = LZO     $@
417      cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@
418
419quiet_cmd_lzo_with_size = LZO     $@
420      cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
421
422quiet_cmd_lz4 = LZ4     $@
423      cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout > $@
424
425quiet_cmd_lz4_with_size = LZ4     $@
426      cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \
427                  $(size_append); } > $@
428
429# U-Boot mkimage
430# ---------------------------------------------------------------------------
431
432MKIMAGE := $(srctree)/scripts/mkuboot.sh
433
434# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
435# the number of overrides in arch makefiles
436UIMAGE_ARCH ?= $(SRCARCH)
437UIMAGE_COMPRESSION ?= $(or $(2),none)
438UIMAGE_OPTS-y ?=
439UIMAGE_TYPE ?= kernel
440UIMAGE_LOADADDR ?= arch_must_set_this
441UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
442UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
443
444quiet_cmd_uimage = UIMAGE  $@
445      cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
446			-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
447			-T $(UIMAGE_TYPE) \
448			-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
449			-n $(UIMAGE_NAME) -d $< $@
450
451# XZ
452# ---------------------------------------------------------------------------
453# Use xzkern to compress the kernel image and xzmisc to compress other things.
454#
455# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
456# of the kernel decompressor. A BCJ filter is used if it is available for
457# the target architecture. xzkern also appends uncompressed size of the data
458# using size_append. The .xz format has the size information available at
459# the end of the file too, but it's in more complex format and it's good to
460# avoid changing the part of the boot code that reads the uncompressed size.
461# Note that the bytes added by size_append will make the xz tool think that
462# the file is corrupt. This is expected.
463#
464# xzmisc doesn't use size_append, so it can be used to create normal .xz
465# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
466# big dictionary would increase the memory usage too much in the multi-call
467# decompression mode. A BCJ filter isn't used either.
468quiet_cmd_xzkern = XZKERN  $@
469      cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@
470
471quiet_cmd_xzkern_with_size = XZKERN  $@
472      cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
473                     $(size_append); } > $@
474
475quiet_cmd_xzmisc = XZMISC  $@
476      cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
477
478# ZSTD
479# ---------------------------------------------------------------------------
480# Appends the uncompressed size of the data using size_append. The .zst
481# format has the size information available at the beginning of the file too,
482# but it's in a more complex format and it's good to avoid changing the part
483# of the boot code that reads the uncompressed size.
484#
485# Note that the bytes added by size_append will make the zstd tool think that
486# the file is corrupt. This is expected.
487#
488# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of
489# 128 MB. zstd22 is used for kernel compression because it is decompressed in a
490# single pass, so zstd doesn't need to allocate a window buffer. When streaming
491# decompression is used, like initramfs decompression, zstd22 should likely not
492# be used because it would require zstd to allocate a 128 MB buffer.
493
494quiet_cmd_zstd = ZSTD    $@
495      cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@
496
497quiet_cmd_zstd22 = ZSTD22  $@
498      cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@
499
500quiet_cmd_zstd22_with_size = ZSTD22  $@
501      cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
502
503# ASM offsets
504# ---------------------------------------------------------------------------
505
506# Default sed regexp - multiline due to syntax constraints
507#
508# Use [:space:] because LLVM's integrated assembler inserts <tab> around
509# the .ascii directive whereas GCC keeps the <space> as-is.
510define sed-offsets
511	's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
512	/^->/{s:->#\(.*\):/* \1 */:; \
513	s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
514	s:->::; p;}'
515endef
516
517# Use filechk to avoid rebuilds when a header changes, but the resulting file
518# does not
519define filechk_offsets
520	 echo "#ifndef $2"; \
521	 echo "#define $2"; \
522	 echo "/*"; \
523	 echo " * DO NOT MODIFY."; \
524	 echo " *"; \
525	 echo " * This file was generated by Kbuild"; \
526	 echo " */"; \
527	 echo ""; \
528	 sed -ne $(sed-offsets) < $<; \
529	 echo ""; \
530	 echo "#endif"
531endef
532