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1 | # SPDX-License-Identifier: GPL-2.0 | |
2 | # ========================================================================== | |
3 | # Building | |
4 | # ========================================================================== | |
5 | ||
6 | src := $(obj) | |
7 | ||
8 | PHONY := __build | |
9 | __build: | |
10 | ||
11 | # Init all relevant variables used in kbuild files so | |
12 | # 1) they have correct type | |
13 | # 2) they do not inherit any value from the environment | |
14 | obj-y := | |
15 | obj-m := | |
16 | lib-y := | |
17 | lib-m := | |
18 | always := | |
19 | targets := | |
20 | subdir-y := | |
21 | subdir-m := | |
22 | EXTRA_AFLAGS := | |
23 | EXTRA_CFLAGS := | |
24 | EXTRA_CPPFLAGS := | |
25 | EXTRA_LDFLAGS := | |
26 | asflags-y := | |
27 | ccflags-y := | |
28 | cppflags-y := | |
29 | ldflags-y := | |
30 | ||
31 | subdir-asflags-y := | |
32 | subdir-ccflags-y := | |
33 | ||
34 | # Read auto.conf if it exists, otherwise ignore | |
35 | -include include/config/auto.conf | |
36 | ||
37 | include scripts/Kbuild.include | |
38 | ||
39 | # The filename Kbuild has precedence over Makefile | |
40 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) | |
41 | kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) | |
42 | include $(kbuild-file) | |
43 | ||
44 | include scripts/Makefile.lib | |
45 | ||
46 | # Do not include host rules unless needed | |
47 | ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),) | |
48 | include scripts/Makefile.host | |
49 | endif | |
50 | ||
51 | ifndef obj | |
52 | $(warning kbuild: Makefile.build is included improperly) | |
53 | endif | |
54 | ||
55 | # =========================================================================== | |
56 | ||
57 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) | |
58 | lib-target := $(obj)/lib.a | |
59 | real-obj-y += $(obj)/lib-ksyms.o | |
60 | endif | |
61 | ||
62 | ifneq ($(strip $(real-obj-y) $(need-builtin)),) | |
63 | builtin-target := $(obj)/built-in.a | |
64 | endif | |
65 | ||
66 | modorder-target := $(obj)/modules.order | |
67 | ||
68 | # We keep a list of all modules in $(MODVERDIR) | |
69 | ||
70 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ | |
71 | $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \ | |
72 | $(subdir-ym) $(always) | |
73 | @: | |
74 | ||
75 | # Linus' kernel sanity checking tool | |
76 | ifeq ($(KBUILD_CHECKSRC),1) | |
77 | quiet_cmd_checksrc = CHECK $< | |
78 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
79 | else ifeq ($(KBUILD_CHECKSRC),2) | |
80 | quiet_cmd_force_checksrc = CHECK $< | |
81 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
82 | endif | |
83 | ||
84 | ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),) | |
85 | cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< ; | |
86 | endif | |
87 | ||
88 | # Do section mismatch analysis for each module/built-in.a | |
89 | ifdef CONFIG_DEBUG_SECTION_MISMATCH | |
90 | cmd_secanalysis = ; scripts/mod/modpost $@ | |
91 | endif | |
92 | ||
93 | # Compile C sources (.c) | |
94 | # --------------------------------------------------------------------------- | |
95 | ||
96 | # Default is built-in, unless we know otherwise | |
97 | modkern_cflags = \ | |
98 | $(if $(part-of-module), \ | |
99 | $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ | |
100 | $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL)) | |
101 | quiet_modtag := $(empty) $(empty) | |
102 | ||
103 | $(real-obj-m) : part-of-module := y | |
104 | $(real-obj-m:.o=.i) : part-of-module := y | |
105 | $(real-obj-m:.o=.s) : part-of-module := y | |
106 | $(real-obj-m:.o=.lst): part-of-module := y | |
107 | ||
108 | $(real-obj-m) : quiet_modtag := [M] | |
109 | $(real-obj-m:.o=.i) : quiet_modtag := [M] | |
110 | $(real-obj-m:.o=.s) : quiet_modtag := [M] | |
111 | $(real-obj-m:.o=.lst): quiet_modtag := [M] | |
112 | ||
113 | $(obj-m) : quiet_modtag := [M] | |
114 | ||
115 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ | |
116 | cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $< | |
117 | ||
118 | $(obj)/%.s: $(src)/%.c FORCE | |
119 | $(call if_changed_dep,cc_s_c) | |
120 | ||
121 | quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@ | |
122 | cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $< | |
123 | ||
124 | $(obj)/%.i: $(src)/%.c FORCE | |
125 | $(call if_changed_dep,cpp_i_c) | |
126 | ||
127 | # These mirror gensymtypes_S and co below, keep them in synch. | |
128 | cmd_gensymtypes_c = \ | |
129 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ | |
130 | $(GENKSYMS) $(if $(1), -T $(2)) \ | |
131 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ | |
132 | $(if $(KBUILD_PRESERVE),-p) \ | |
133 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) | |
134 | ||
135 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ | |
136 | cmd_cc_symtypes_c = \ | |
137 | set -e; \ | |
138 | $(call cmd_gensymtypes_c,true,$@) >/dev/null; \ | |
139 | test -s $@ || rm -f $@ | |
140 | ||
141 | $(obj)/%.symtypes : $(src)/%.c FORCE | |
142 | $(call cmd,cc_symtypes_c) | |
143 | ||
144 | # LLVM assembly | |
145 | # Generate .ll files from .c | |
146 | quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ | |
147 | cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $< | |
148 | ||
149 | $(obj)/%.ll: $(src)/%.c FORCE | |
150 | $(call if_changed_dep,cc_ll_c) | |
151 | ||
152 | # C (.c) files | |
153 | # The C file is compiled and updated dependency information is generated. | |
154 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) | |
155 | ||
156 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ | |
157 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< | |
158 | ||
159 | ifdef CONFIG_MODVERSIONS | |
160 | # When module versioning is enabled the following steps are executed: | |
161 | # o compile a <file>.o from <file>.c | |
162 | # o if <file>.o doesn't contain a __ksymtab version, i.e. does | |
163 | # not export symbols, it's done. | |
164 | # o otherwise, we calculate symbol versions using the good old | |
165 | # genksyms on the preprocessed source and postprocess them in a way | |
166 | # that they are usable as a linker script | |
167 | # o generate .tmp_<file>.o from <file>.o using the linker to | |
168 | # replace the unresolved symbols __crc_exported_symbol with | |
169 | # the actual value of the checksum generated by genksyms | |
170 | # o remove .tmp_<file>.o to <file>.o | |
171 | ||
172 | cmd_modversions_c = \ | |
173 | if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \ | |
174 | $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ | |
175 | > $(@D)/.tmp_$(@F:.o=.ver); \ | |
176 | \ | |
177 | $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \ | |
178 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
179 | mv -f $(@D)/.tmp_$(@F) $@; \ | |
180 | rm -f $(@D)/.tmp_$(@F:.o=.ver); \ | |
181 | fi; | |
182 | endif | |
183 | ||
184 | ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
185 | ifndef CC_USING_RECORD_MCOUNT | |
186 | # compiler will not generate __mcount_loc use recordmcount or recordmcount.pl | |
187 | ifdef BUILD_C_RECORDMCOUNT | |
188 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") | |
189 | RECORDMCOUNT_FLAGS = -w | |
190 | endif | |
191 | # Due to recursion, we must skip empty.o. | |
192 | # The empty.o file is created in the make process in order to determine | |
193 | # the target endianness and word size. It is made before all other C | |
194 | # files, including recordmcount. | |
195 | sub_cmd_record_mcount = \ | |
196 | if [ $(@) != "scripts/mod/empty.o" ]; then \ | |
197 | $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ | |
198 | fi; | |
199 | recordmcount_source := $(srctree)/scripts/recordmcount.c \ | |
200 | $(srctree)/scripts/recordmcount.h | |
201 | else | |
202 | sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ | |
203 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ | |
204 | "$(if $(CONFIG_64BIT),64,32)" \ | |
205 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \ | |
206 | "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \ | |
207 | "$(if $(part-of-module),1,0)" "$(@)"; | |
208 | recordmcount_source := $(srctree)/scripts/recordmcount.pl | |
209 | endif # BUILD_C_RECORDMCOUNT | |
210 | cmd_record_mcount = \ | |
211 | if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \ | |
212 | "$(CC_FLAGS_FTRACE)" ]; then \ | |
213 | $(sub_cmd_record_mcount) \ | |
214 | fi; | |
215 | endif # CC_USING_RECORD_MCOUNT | |
216 | endif # CONFIG_FTRACE_MCOUNT_RECORD | |
217 | ||
218 | ifdef CONFIG_STACK_VALIDATION | |
219 | ifneq ($(SKIP_STACK_VALIDATION),1) | |
220 | ||
221 | __objtool_obj := $(objtree)/tools/objtool/objtool | |
222 | ||
223 | objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check) | |
224 | ||
225 | objtool_args += $(if $(part-of-module), --module,) | |
226 | ||
227 | ifndef CONFIG_FRAME_POINTER | |
228 | objtool_args += --no-fp | |
229 | endif | |
230 | ifdef CONFIG_GCOV_KERNEL | |
231 | objtool_args += --no-unreachable | |
232 | endif | |
233 | ifdef CONFIG_RETPOLINE | |
234 | ifneq ($(RETPOLINE_CFLAGS),) | |
235 | objtool_args += --retpoline | |
236 | endif | |
237 | endif | |
238 | ||
239 | # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory | |
240 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file | |
241 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file | |
242 | cmd_objtool = $(if $(patsubst y%,, \ | |
243 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ | |
244 | $(__objtool_obj) $(objtool_args) $@;) | |
245 | objtool_obj = $(if $(patsubst y%,, \ | |
246 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ | |
247 | $(__objtool_obj)) | |
248 | ||
249 | endif # SKIP_STACK_VALIDATION | |
250 | endif # CONFIG_STACK_VALIDATION | |
251 | ||
252 | # Rebuild all objects when objtool changes, or is enabled/disabled. | |
253 | objtool_dep = $(objtool_obj) \ | |
254 | $(wildcard include/config/orc/unwinder.h \ | |
255 | include/config/stack/validation.h) | |
256 | ||
257 | ifdef CONFIG_TRIM_UNUSED_KSYMS | |
258 | cmd_gen_ksymdeps = \ | |
259 | $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd; | |
260 | endif | |
261 | ||
262 | define rule_cc_o_c | |
263 | $(call cmd,checksrc) | |
264 | $(call cmd_and_fixdep,cc_o_c) | |
265 | $(call cmd,gen_ksymdeps) | |
266 | $(call cmd,checkdoc) | |
267 | $(call cmd,objtool) | |
268 | $(call cmd,modversions_c) | |
269 | $(call cmd,record_mcount) | |
270 | endef | |
271 | ||
272 | define rule_as_o_S | |
273 | $(call cmd_and_fixdep,as_o_S) | |
274 | $(call cmd,gen_ksymdeps) | |
275 | $(call cmd,objtool) | |
276 | $(call cmd,modversions_S) | |
277 | endef | |
278 | ||
279 | # List module undefined symbols (or empty line if not enabled) | |
280 | ifdef CONFIG_TRIM_UNUSED_KSYMS | |
281 | cmd_undef_syms = $(NM) $@ | sed -n 's/^ *U //p' | xargs echo | |
282 | else | |
283 | cmd_undef_syms = echo | |
284 | endif | |
285 | ||
286 | # Built-in and composite module parts | |
287 | $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE | |
288 | $(call cmd,force_checksrc) | |
289 | $(call if_changed_rule,cc_o_c) | |
290 | ||
291 | # Single-part modules are special since we need to mark them in $(MODVERDIR) | |
292 | ||
293 | $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE | |
294 | $(call cmd,force_checksrc) | |
295 | $(call if_changed_rule,cc_o_c) | |
296 | @{ echo $(@:.o=.ko); echo $@; \ | |
297 | $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) | |
298 | ||
299 | quiet_cmd_cc_lst_c = MKLST $@ | |
300 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ | |
301 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ | |
302 | System.map $(OBJDUMP) > $@ | |
303 | ||
304 | $(obj)/%.lst: $(src)/%.c FORCE | |
305 | $(call if_changed_dep,cc_lst_c) | |
306 | ||
307 | # Compile assembler sources (.S) | |
308 | # --------------------------------------------------------------------------- | |
309 | ||
310 | modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) | |
311 | ||
312 | $(real-obj-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) | |
313 | $(real-obj-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) | |
314 | ||
315 | # .S file exports must have their C prototypes defined in asm/asm-prototypes.h | |
316 | # or a file that it includes, in order to get versioned symbols. We build a | |
317 | # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from | |
318 | # the .S file (with trailing ';'), and run genksyms on that, to extract vers. | |
319 | # | |
320 | # This is convoluted. The .S file must first be preprocessed to run guards and | |
321 | # expand names, then the resulting exports must be constructed into plain | |
322 | # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed | |
323 | # to make the genksyms input. | |
324 | # | |
325 | # These mirror gensymtypes_c and co above, keep them in synch. | |
326 | cmd_gensymtypes_S = \ | |
327 | (echo "\#include <linux/kernel.h>" ; \ | |
328 | echo "\#include <asm/asm-prototypes.h>" ; \ | |
329 | $(CPP) $(a_flags) $< | \ | |
330 | grep "\<___EXPORT_SYMBOL\>" | \ | |
331 | sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \ | |
332 | $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \ | |
333 | $(GENKSYMS) $(if $(1), -T $(2)) \ | |
334 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ | |
335 | $(if $(KBUILD_PRESERVE),-p) \ | |
336 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) | |
337 | ||
338 | quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@ | |
339 | cmd_cc_symtypes_S = \ | |
340 | set -e; \ | |
341 | $(call cmd_gensymtypes_S,true,$@) >/dev/null; \ | |
342 | test -s $@ || rm -f $@ | |
343 | ||
344 | $(obj)/%.symtypes : $(src)/%.S FORCE | |
345 | $(call cmd,cc_symtypes_S) | |
346 | ||
347 | ||
348 | quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@ | |
349 | cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< | |
350 | ||
351 | $(obj)/%.s: $(src)/%.S FORCE | |
352 | $(call if_changed_dep,cpp_s_S) | |
353 | ||
354 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ | |
355 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< | |
356 | ||
357 | ifdef CONFIG_MODVERSIONS | |
358 | ||
359 | ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h) | |
360 | ||
361 | ifneq ($(ASM_PROTOTYPES),) | |
362 | ||
363 | # versioning matches the C process described above, with difference that | |
364 | # we parse asm-prototypes.h C header to get function definitions. | |
365 | ||
366 | cmd_modversions_S = \ | |
367 | if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \ | |
368 | $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ | |
369 | > $(@D)/.tmp_$(@F:.o=.ver); \ | |
370 | \ | |
371 | $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \ | |
372 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
373 | mv -f $(@D)/.tmp_$(@F) $@; \ | |
374 | rm -f $(@D)/.tmp_$(@F:.o=.ver); \ | |
375 | fi; | |
376 | endif | |
377 | endif | |
378 | ||
379 | $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE | |
380 | $(call if_changed_rule,as_o_S) | |
381 | ||
382 | targets += $(filter-out $(subdir-obj-y), $(real-obj-y)) $(real-obj-m) $(lib-y) | |
383 | targets += $(extra-y) $(MAKECMDGOALS) $(always) | |
384 | ||
385 | # Linker scripts preprocessor (.lds.S -> .lds) | |
386 | # --------------------------------------------------------------------------- | |
387 | quiet_cmd_cpp_lds_S = LDS $@ | |
388 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ | |
389 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< | |
390 | ||
391 | $(obj)/%.lds: $(src)/%.lds.S FORCE | |
392 | $(call if_changed_dep,cpp_lds_S) | |
393 | ||
394 | # ASN.1 grammar | |
395 | # --------------------------------------------------------------------------- | |
396 | quiet_cmd_asn1_compiler = ASN.1 $@ | |
397 | cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ | |
398 | $(subst .h,.c,$@) $(subst .c,.h,$@) | |
399 | ||
400 | $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler | |
401 | $(call cmd,asn1_compiler) | |
402 | ||
403 | # Build the compiled-in targets | |
404 | # --------------------------------------------------------------------------- | |
405 | ||
406 | # To build objects in subdirs, we need to descend into the directories | |
407 | $(sort $(subdir-obj-y)): $(subdir-ym) ; | |
408 | ||
409 | # | |
410 | # Rule to compile a set of .o files into one .o file | |
411 | # | |
412 | ifdef builtin-target | |
413 | ||
414 | # built-in.a archives are made with no symbol table or index which | |
415 | # makes them small and fast, but unable to be used by the linker. | |
416 | # scripts/link-vmlinux.sh builds an aggregate built-in.a with a symbol | |
417 | # table and index. | |
418 | quiet_cmd_ar_builtin = AR $@ | |
419 | cmd_ar_builtin = rm -f $@; \ | |
420 | $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(filter $(real-obj-y), $^) | |
421 | ||
422 | $(builtin-target): $(real-obj-y) FORCE | |
423 | $(call if_changed,ar_builtin) | |
424 | ||
425 | targets += $(builtin-target) | |
426 | endif # builtin-target | |
427 | ||
428 | # | |
429 | # Rule to create modules.order file | |
430 | # | |
431 | # Create commands to either record .ko file or cat modules.order from | |
432 | # a subdirectory | |
433 | modorder-cmds = \ | |
434 | $(foreach m, $(modorder), \ | |
435 | $(if $(filter %/modules.order, $m), \ | |
436 | cat $m;, echo kernel/$m;)) | |
437 | ||
438 | $(modorder-target): $(subdir-ym) FORCE | |
439 | $(Q)(cat /dev/null; $(modorder-cmds)) > $@ | |
440 | ||
441 | # | |
442 | # Rule to compile a set of .o files into one .a file | |
443 | # | |
444 | ifdef lib-target | |
445 | quiet_cmd_link_l_target = AR $@ | |
446 | ||
447 | # lib target archives do get a symbol table and index | |
448 | cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y) | |
449 | ||
450 | $(lib-target): $(lib-y) FORCE | |
451 | $(call if_changed,link_l_target) | |
452 | ||
453 | targets += $(lib-target) | |
454 | ||
455 | dummy-object = $(obj)/.lib_exports.o | |
456 | ksyms-lds = $(dot-target).lds | |
457 | ||
458 | quiet_cmd_export_list = EXPORTS $@ | |
459 | cmd_export_list = $(OBJDUMP) -h $< | \ | |
460 | sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/EXTERN(\1)/p' >$(ksyms-lds);\ | |
461 | rm -f $(dummy-object);\ | |
462 | echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\ | |
463 | $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\ | |
464 | rm $(dummy-object) $(ksyms-lds) | |
465 | ||
466 | $(obj)/lib-ksyms.o: $(lib-target) FORCE | |
467 | $(call if_changed,export_list) | |
468 | ||
469 | targets += $(obj)/lib-ksyms.o | |
470 | ||
471 | endif | |
472 | ||
473 | quiet_cmd_link_multi-m = LD [M] $@ | |
474 | cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^) $(cmd_secanalysis) | |
475 | ||
476 | $(multi-used-m): FORCE | |
477 | $(call if_changed,link_multi-m) | |
478 | @{ echo $(@:.o=.ko); echo $(filter %.o,$^); \ | |
479 | $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) | |
480 | $(call multi_depend, $(multi-used-m), .o, -objs -y -m) | |
481 | ||
482 | targets += $(multi-used-m) | |
483 | targets := $(filter-out $(PHONY), $(targets)) | |
484 | ||
485 | # Add intermediate targets: | |
486 | # When building objects with specific suffix patterns, add intermediate | |
487 | # targets that the final targets are derived from. | |
488 | intermediate_targets = $(foreach sfx, $(2), \ | |
489 | $(patsubst %$(strip $(1)),%$(sfx), \ | |
490 | $(filter %$(strip $(1)), $(targets)))) | |
491 | # %.asn1.o <- %.asn1.[ch] <- %.asn1 | |
492 | # %.dtb.o <- %.dtb.S <- %.dtb <- %.dts | |
493 | # %.lex.o <- %.lex.c <- %.l | |
494 | # %.tab.o <- %.tab.[ch] <- %.y | |
495 | targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \ | |
496 | $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \ | |
497 | $(call intermediate_targets, .lex.o, .lex.c) \ | |
498 | $(call intermediate_targets, .tab.o, .tab.c .tab.h) | |
499 | ||
500 | # Descending | |
501 | # --------------------------------------------------------------------------- | |
502 | ||
503 | PHONY += $(subdir-ym) | |
504 | $(subdir-ym): | |
505 | $(Q)$(MAKE) $(build)=$@ need-builtin=$(if $(findstring $@,$(subdir-obj-y)),1) | |
506 | ||
507 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
508 | # --------------------------------------------------------------------------- | |
509 | ||
510 | PHONY += FORCE | |
511 | ||
512 | FORCE: | |
513 | ||
514 | # Read all saved command lines and dependencies for the $(targets) we | |
515 | # may be building above, using $(if_changed{,_dep}). As an | |
516 | # optimization, we don't need to read them if the target does not | |
517 | # exist, we will rebuild anyway in that case. | |
518 | ||
519 | existing-targets := $(wildcard $(sort $(targets))) | |
520 | ||
521 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) | |
522 | ||
523 | ifneq ($(KBUILD_SRC),) | |
524 | # Create directories for object files if they do not exist | |
525 | obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets)))) | |
526 | # If targets exist, their directories apparently exist. Skip mkdir. | |
527 | existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets)))) | |
528 | obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs))) | |
529 | ifneq ($(obj-dirs),) | |
530 | $(shell mkdir -p $(obj-dirs)) | |
531 | endif | |
532 | endif | |
533 | ||
534 | # Some files contained in $(targets) are intermediate artifacts. | |
535 | # We never want them to be removed automatically. | |
536 | .SECONDARY: $(targets) | |
537 | ||
538 | .PHONY: $(PHONY) |