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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) | |
7 | ||
8 | # flags that take effect in current and sub directories | |
9 | KBUILD_AFLAGS += $(subdir-asflags-y) | |
10 | KBUILD_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 | |
17 | obj-m := $(filter-out $(obj-y),$(obj-m)) | |
18 | ||
19 | # Libraries are always collected in one lib file. | |
20 | # Filter out objects already built-in | |
21 | lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) | |
22 | ||
23 | # Determine modorder. | |
24 | # Unfortunately, we don't have information about ordering between -y | |
25 | # and -m subdirs. Just put -y's first. | |
26 | modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko)) | |
27 | ||
28 | # Handle objects in subdirs | |
29 | # --------------------------------------------------------------------------- | |
30 | # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.a | |
31 | # and add the directory to the list of dirs to descend into: $(subdir-y) | |
32 | # o if we encounter foo/ in $(obj-m), remove it from $(obj-m) | |
33 | # and add the directory to the list of dirs to descend into: $(subdir-m) | |
34 | __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) | |
35 | subdir-y += $(__subdir-y) | |
36 | __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m))) | |
37 | subdir-m += $(__subdir-m) | |
38 | obj-y := $(patsubst %/, %/built-in.a, $(obj-y)) | |
39 | obj-m := $(filter-out %/, $(obj-m)) | |
40 | ||
41 | # Subdirectories we need to descend into | |
42 | subdir-ym := $(sort $(subdir-y) $(subdir-m)) | |
43 | ||
44 | # if $(foo-objs), $(foo-y), or $(foo-m) exists, foo.o is a composite object | |
45 | multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) | |
46 | multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m)))) | |
47 | multi-used := $(multi-used-y) $(multi-used-m) | |
48 | single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m))) | |
49 | ||
50 | # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to | |
51 | # tell kbuild to descend | |
52 | subdir-obj-y := $(filter %/built-in.a, $(obj-y)) | |
53 | ||
54 | # Replace multi-part objects by their individual parts, | |
55 | # including built-in.a from subdirectories | |
56 | real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) | |
57 | real-obj-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m))) | |
58 | ||
59 | # DTB | |
60 | # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built | |
61 | extra-y += $(dtb-y) | |
62 | extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-) | |
63 | ||
64 | ifneq ($(CHECK_DTBS),) | |
65 | extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y)) | |
66 | extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-)) | |
67 | endif | |
68 | ||
69 | # Add subdir path | |
70 | ||
71 | extra-y := $(addprefix $(obj)/,$(extra-y)) | |
72 | always := $(addprefix $(obj)/,$(always)) | |
73 | targets := $(addprefix $(obj)/,$(targets)) | |
74 | modorder := $(addprefix $(obj)/,$(modorder)) | |
75 | obj-m := $(addprefix $(obj)/,$(obj-m)) | |
76 | lib-y := $(addprefix $(obj)/,$(lib-y)) | |
77 | subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) | |
78 | real-obj-y := $(addprefix $(obj)/,$(real-obj-y)) | |
79 | real-obj-m := $(addprefix $(obj)/,$(real-obj-m)) | |
80 | single-used-m := $(addprefix $(obj)/,$(single-used-m)) | |
81 | multi-used-m := $(addprefix $(obj)/,$(multi-used-m)) | |
82 | subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) | |
83 | ||
84 | # Finds the multi-part object the current object will be linked into. | |
85 | # If the object belongs to two or more multi-part objects, all of them are | |
86 | # concatenated with a colon separator. | |
87 | modname-multi = $(subst $(space),:,$(sort $(foreach m,$(multi-used),\ | |
88 | $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=))))) | |
89 | ||
90 | modname = $(if $(modname-multi),$(modname-multi),$(basetarget)) | |
91 | ||
92 | # These flags are needed for modversions and compiling, so we define them here | |
93 | # $(modname_flags) defines KBUILD_MODNAME as the name of the module it will | |
94 | # end up in (or would, if it gets compiled in) | |
95 | name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote) | |
96 | basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget)) | |
97 | modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) | |
98 | ||
99 | orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \ | |
100 | $(ccflags-y) $(CFLAGS_$(basetarget).o) | |
101 | _c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags)) | |
102 | orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \ | |
103 | $(asflags-y) $(AFLAGS_$(basetarget).o) | |
104 | _a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags)) | |
105 | _cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F)) | |
106 | ||
107 | # | |
108 | # Enable gcov profiling flags for a file, directory or for all files depending | |
109 | # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL | |
110 | # (in this order) | |
111 | # | |
112 | ifeq ($(CONFIG_GCOV_KERNEL),y) | |
113 | _c_flags += $(if $(patsubst n%,, \ | |
114 | $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \ | |
115 | $(CFLAGS_GCOV)) | |
116 | endif | |
117 | ||
118 | # | |
119 | # Enable address sanitizer flags for kernel except some files or directories | |
120 | # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) | |
121 | # | |
122 | ifeq ($(CONFIG_KASAN),y) | |
123 | _c_flags += $(if $(patsubst n%,, \ | |
124 | $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ | |
125 | $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE)) | |
126 | endif | |
127 | ||
128 | ifeq ($(CONFIG_UBSAN),y) | |
129 | _c_flags += $(if $(patsubst n%,, \ | |
130 | $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \ | |
131 | $(CFLAGS_UBSAN)) | |
132 | endif | |
133 | ||
134 | ifeq ($(CONFIG_KCOV),y) | |
135 | _c_flags += $(if $(patsubst n%,, \ | |
136 | $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \ | |
137 | $(CFLAGS_KCOV)) | |
138 | endif | |
139 | ||
140 | __c_flags = $(_c_flags) | |
141 | __a_flags = $(_a_flags) | |
142 | __cpp_flags = $(_cpp_flags) | |
143 | ||
144 | # If building the kernel in a separate objtree expand all occurrences | |
145 | # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). | |
146 | ifeq ($(KBUILD_EXTMOD),) | |
147 | ifneq ($(srctree),.) | |
148 | ||
149 | # -I$(obj) locates generated .h files | |
150 | # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files | |
151 | # and locates generated .h files | |
152 | # FIXME: Replace both with specific CFLAGS* statements in the makefiles | |
153 | __c_flags = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \ | |
154 | $(call flags,_c_flags) | |
155 | __a_flags = $(call flags,_a_flags) | |
156 | __cpp_flags = $(call flags,_cpp_flags) | |
157 | endif | |
158 | endif | |
159 | ||
160 | c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ | |
161 | -include $(srctree)/include/linux/compiler_types.h \ | |
162 | $(__c_flags) $(modkern_cflags) \ | |
163 | $(basename_flags) $(modname_flags) | |
164 | ||
165 | a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ | |
166 | $(__a_flags) $(modkern_aflags) | |
167 | ||
168 | cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ | |
169 | $(__cpp_flags) | |
170 | ||
171 | ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) | |
172 | ||
173 | DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes | |
174 | ||
175 | dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \ | |
176 | $(addprefix -I,$(DTC_INCLUDE)) \ | |
177 | -undef -D__DTS__ | |
178 | ||
179 | # Useful for describing the dependency of composite objects | |
180 | # Usage: | |
181 | # $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) | |
182 | define multi_depend | |
183 | $(foreach m, $(notdir $1), \ | |
184 | $(eval $(obj)/$m: \ | |
185 | $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) | |
186 | endef | |
187 | ||
188 | # LEX | |
189 | # --------------------------------------------------------------------------- | |
190 | quiet_cmd_flex = LEX $@ | |
191 | cmd_flex = $(LEX) -o$@ -L $< | |
192 | ||
193 | $(obj)/%.lex.c: $(src)/%.l FORCE | |
194 | $(call if_changed,flex) | |
195 | ||
196 | # YACC | |
197 | # --------------------------------------------------------------------------- | |
198 | quiet_cmd_bison = YACC $@ | |
199 | cmd_bison = $(YACC) -o$@ -t -l $< | |
200 | ||
201 | $(obj)/%.tab.c: $(src)/%.y FORCE | |
202 | $(call if_changed,bison) | |
203 | ||
204 | quiet_cmd_bison_h = YACC $@ | |
205 | cmd_bison_h = $(YACC) -o/dev/null --defines=$@ -t -l $< | |
206 | ||
207 | $(obj)/%.tab.h: $(src)/%.y FORCE | |
208 | $(call if_changed,bison_h) | |
209 | ||
210 | # Shipped files | |
211 | # =========================================================================== | |
212 | ||
213 | quiet_cmd_shipped = SHIPPED $@ | |
214 | cmd_shipped = cat $< > $@ | |
215 | ||
216 | $(obj)/%: $(src)/%_shipped | |
217 | $(call cmd,shipped) | |
218 | ||
219 | # Commands useful for building a boot image | |
220 | # =========================================================================== | |
221 | # | |
222 | # Use as following: | |
223 | # | |
224 | # target: source(s) FORCE | |
225 | # $(if_changed,ld/objcopy/gzip) | |
226 | # | |
227 | # and add target to extra-y so that we know we have to | |
228 | # read in the saved command line | |
229 | ||
230 | # Linking | |
231 | # --------------------------------------------------------------------------- | |
232 | ||
233 | quiet_cmd_ld = LD $@ | |
234 | cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@ | |
235 | ||
236 | # Archive | |
237 | # --------------------------------------------------------------------------- | |
238 | ||
239 | quiet_cmd_ar = AR $@ | |
240 | cmd_ar = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(real-prereqs) | |
241 | ||
242 | # Objcopy | |
243 | # --------------------------------------------------------------------------- | |
244 | ||
245 | quiet_cmd_objcopy = OBJCOPY $@ | |
246 | cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ | |
247 | ||
248 | # Gzip | |
249 | # --------------------------------------------------------------------------- | |
250 | ||
251 | quiet_cmd_gzip = GZIP $@ | |
252 | cmd_gzip = cat $(real-prereqs) | gzip -n -f -9 > $@ | |
253 | ||
254 | # DTC | |
255 | # --------------------------------------------------------------------------- | |
256 | DTC ?= $(objtree)/scripts/dtc/dtc | |
257 | ||
258 | # Disable noisy checks by default | |
259 | ifeq ($(findstring 1,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),) | |
260 | DTC_FLAGS += -Wno-unit_address_vs_reg \ | |
261 | -Wno-unit_address_format \ | |
262 | -Wno-avoid_unnecessary_addr_size \ | |
263 | -Wno-alias_paths \ | |
264 | -Wno-graph_child_address \ | |
265 | -Wno-simple_bus_reg \ | |
266 | -Wno-unique_unit_address \ | |
267 | -Wno-pci_device_reg | |
268 | endif | |
269 | ||
270 | ifneq ($(findstring 2,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),) | |
271 | DTC_FLAGS += -Wnode_name_chars_strict \ | |
272 | -Wproperty_name_chars_strict | |
273 | endif | |
274 | ||
275 | DTC_FLAGS += $(DTC_FLAGS_$(basetarget)) | |
276 | ||
277 | # Generate an assembly file to wrap the output of the device tree compiler | |
278 | quiet_cmd_dt_S_dtb= DTB $@ | |
279 | cmd_dt_S_dtb= \ | |
280 | { \ | |
281 | echo '\#include <asm-generic/vmlinux.lds.h>'; \ | |
282 | echo '.section .dtb.init.rodata,"a"'; \ | |
283 | echo '.balign STRUCT_ALIGNMENT'; \ | |
284 | echo '.global __dtb_$(subst -,_,$(*F))_begin'; \ | |
285 | echo '__dtb_$(subst -,_,$(*F))_begin:'; \ | |
286 | echo '.incbin "$<" '; \ | |
287 | echo '__dtb_$(subst -,_,$(*F))_end:'; \ | |
288 | echo '.global __dtb_$(subst -,_,$(*F))_end'; \ | |
289 | echo '.balign STRUCT_ALIGNMENT'; \ | |
290 | } > $@ | |
291 | ||
292 | $(obj)/%.dtb.S: $(obj)/%.dtb FORCE | |
293 | $(call if_changed,dt_S_dtb) | |
294 | ||
295 | quiet_cmd_dtc = DTC $@ | |
296 | cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ | |
297 | $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ | |
298 | $(DTC) -O $(2) -o $@ -b 0 \ | |
299 | $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \ | |
300 | -d $(depfile).dtc.tmp $(dtc-tmp) ; \ | |
301 | cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) | |
302 | ||
303 | $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE | |
304 | $(call if_changed_dep,dtc,dtb) | |
305 | ||
306 | DT_CHECKER ?= dt-validate | |
307 | DT_BINDING_DIR := Documentation/devicetree/bindings | |
308 | DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml | |
309 | ||
310 | quiet_cmd_dtb_check = CHECK $@ | |
311 | cmd_dtb_check = $(DT_CHECKER) -p $(DT_TMP_SCHEMA) $@ ; | |
312 | ||
313 | define rule_dtc_dt_yaml | |
314 | $(call cmd_and_fixdep,dtc,yaml) | |
315 | $(call cmd,dtb_check) | |
316 | endef | |
317 | ||
318 | $(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE | |
319 | $(call if_changed_rule,dtc_dt_yaml) | |
320 | ||
321 | dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) | |
322 | ||
323 | # Bzip2 | |
324 | # --------------------------------------------------------------------------- | |
325 | ||
326 | # Bzip2 and LZMA do not include size in file... so we have to fake that; | |
327 | # append the size as a 32-bit littleendian number as gzip does. | |
328 | size_append = printf $(shell \ | |
329 | dec_size=0; \ | |
330 | for F in $(real-prereqs); do \ | |
331 | fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \ | |
332 | dec_size=$$(expr $$dec_size + $$fsize); \ | |
333 | done; \ | |
334 | printf "%08x\n" $$dec_size | \ | |
335 | sed 's/\(..\)/\1 /g' | { \ | |
336 | read ch0 ch1 ch2 ch3; \ | |
337 | for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ | |
338 | printf '%s%03o' '\\' $$((0x$$ch)); \ | |
339 | done; \ | |
340 | } \ | |
341 | ) | |
342 | ||
343 | quiet_cmd_bzip2 = BZIP2 $@ | |
344 | cmd_bzip2 = { cat $(real-prereqs) | bzip2 -9 && $(size_append); } > $@ | |
345 | ||
346 | # Lzma | |
347 | # --------------------------------------------------------------------------- | |
348 | ||
349 | quiet_cmd_lzma = LZMA $@ | |
350 | cmd_lzma = { cat $(real-prereqs) | lzma -9 && $(size_append); } > $@ | |
351 | ||
352 | quiet_cmd_lzo = LZO $@ | |
353 | cmd_lzo = { cat $(real-prereqs) | lzop -9 && $(size_append); } > $@ | |
354 | ||
355 | quiet_cmd_lz4 = LZ4 $@ | |
356 | cmd_lz4 = { cat $(real-prereqs) | lz4c -l -c1 stdin stdout && \ | |
357 | $(size_append); } > $@ | |
358 | ||
359 | # U-Boot mkimage | |
360 | # --------------------------------------------------------------------------- | |
361 | ||
362 | MKIMAGE := $(srctree)/scripts/mkuboot.sh | |
363 | ||
364 | # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces | |
365 | # the number of overrides in arch makefiles | |
366 | UIMAGE_ARCH ?= $(SRCARCH) | |
367 | UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) | |
368 | UIMAGE_OPTS-y ?= | |
369 | UIMAGE_TYPE ?= kernel | |
370 | UIMAGE_LOADADDR ?= arch_must_set_this | |
371 | UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) | |
372 | UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' | |
373 | ||
374 | quiet_cmd_uimage = UIMAGE $@ | |
375 | cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ | |
376 | -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ | |
377 | -T $(UIMAGE_TYPE) \ | |
378 | -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ | |
379 | -n $(UIMAGE_NAME) -d $< $@ | |
380 | ||
381 | # XZ | |
382 | # --------------------------------------------------------------------------- | |
383 | # Use xzkern to compress the kernel image and xzmisc to compress other things. | |
384 | # | |
385 | # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage | |
386 | # of the kernel decompressor. A BCJ filter is used if it is available for | |
387 | # the target architecture. xzkern also appends uncompressed size of the data | |
388 | # using size_append. The .xz format has the size information available at | |
389 | # the end of the file too, but it's in more complex format and it's good to | |
390 | # avoid changing the part of the boot code that reads the uncompressed size. | |
391 | # Note that the bytes added by size_append will make the xz tool think that | |
392 | # the file is corrupt. This is expected. | |
393 | # | |
394 | # xzmisc doesn't use size_append, so it can be used to create normal .xz | |
395 | # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very | |
396 | # big dictionary would increase the memory usage too much in the multi-call | |
397 | # decompression mode. A BCJ filter isn't used either. | |
398 | quiet_cmd_xzkern = XZKERN $@ | |
399 | cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh && \ | |
400 | $(size_append); } > $@ | |
401 | ||
402 | quiet_cmd_xzmisc = XZMISC $@ | |
403 | cmd_xzmisc = cat $(real-prereqs) | xz --check=crc32 --lzma2=dict=1MiB > $@ | |
404 | ||
405 | # ASM offsets | |
406 | # --------------------------------------------------------------------------- | |
407 | ||
408 | # Default sed regexp - multiline due to syntax constraints | |
409 | # | |
410 | # Use [:space:] because LLVM's integrated assembler inserts <tab> around | |
411 | # the .ascii directive whereas GCC keeps the <space> as-is. | |
412 | define sed-offsets | |
413 | 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ | |
414 | /^->/{s:->#\(.*\):/* \1 */:; \ | |
415 | s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ | |
416 | s:->::; p;}' | |
417 | endef | |
418 | ||
419 | # Use filechk to avoid rebuilds when a header changes, but the resulting file | |
420 | # does not | |
421 | define filechk_offsets | |
422 | echo "#ifndef $2"; \ | |
423 | echo "#define $2"; \ | |
424 | echo "/*"; \ | |
425 | echo " * DO NOT MODIFY."; \ | |
426 | echo " *"; \ | |
427 | echo " * This file was generated by Kbuild"; \ | |
428 | echo " */"; \ | |
429 | echo ""; \ | |
430 | sed -ne $(sed-offsets) < $<; \ | |
431 | echo ""; \ | |
432 | echo "#endif" | |
433 | endef |