Commit | Line | Data |
---|---|---|
b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | # ========================================================================== |
3 | # Building | |
4 | # ========================================================================== | |
5 | ||
6 | src := $(obj) | |
7 | ||
4f193362 | 8 | PHONY := __build |
1da177e4 LT |
9 | __build: |
10 | ||
d72e5edb SR |
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 := | |
5f2fb52f MY |
19 | always-y := |
20 | always-m := | |
d72e5edb SR |
21 | targets := |
22 | subdir-y := | |
23 | subdir-m := | |
24 | EXTRA_AFLAGS := | |
25 | EXTRA_CFLAGS := | |
26 | EXTRA_CPPFLAGS := | |
27 | EXTRA_LDFLAGS := | |
f77bf014 SR |
28 | asflags-y := |
29 | ccflags-y := | |
30 | cppflags-y := | |
31 | ldflags-y := | |
d72e5edb | 32 | |
720097d8 SR |
33 | subdir-asflags-y := |
34 | subdir-ccflags-y := | |
35 | ||
3156fd05 | 36 | # Read auto.conf if it exists, otherwise ignore |
c955ccaf | 37 | -include include/config/auto.conf |
1da177e4 | 38 | |
20a468b5 SR |
39 | include scripts/Kbuild.include |
40 | ||
2a691470 | 41 | # The filename Kbuild has precedence over Makefile |
db8c1a7b | 42 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) |
0c53c8e6 SR |
43 | kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) |
44 | include $(kbuild-file) | |
45 | ||
1da177e4 LT |
46 | include scripts/Makefile.lib |
47 | ||
3156fd05 | 48 | # Do not include host rules unless needed |
5f2fb52f | 49 | ifneq ($(hostprogs)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),) |
1da177e4 LT |
50 | include scripts/Makefile.host |
51 | endif | |
52 | ||
1da177e4 LT |
53 | ifndef obj |
54 | $(warning kbuild: Makefile.build is included improperly) | |
55 | endif | |
56 | ||
394053f4 | 57 | ifeq ($(need-modorder),) |
c07d8d47 MY |
58 | ifneq ($(obj-m),) |
59 | $(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.) | |
60 | $(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.) | |
61 | endif | |
62 | endif | |
63 | ||
1da177e4 LT |
64 | # =========================================================================== |
65 | ||
a4954fd7 | 66 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) |
1da177e4 | 67 | lib-target := $(obj)/lib.a |
f98fe47c | 68 | real-obj-y += $(obj)/lib-ksyms.o |
1da177e4 LT |
69 | endif |
70 | ||
56d58936 | 71 | ifdef need-builtin |
f49821ee | 72 | builtin-target := $(obj)/built-in.a |
1da177e4 LT |
73 | endif |
74 | ||
7e131918 | 75 | ifeq ($(CONFIG_MODULES)$(need-modorder),y1) |
551559e1 | 76 | modorder-target := $(obj)/modules.order |
1d8001ef | 77 | endif |
551559e1 | 78 | |
9f69a496 MY |
79 | mod-targets := $(patsubst %.o, %.mod, $(obj-m)) |
80 | ||
1da177e4 | 81 | # Linus' kernel sanity checking tool |
7d0ea252 MY |
82 | ifeq ($(KBUILD_CHECKSRC),1) |
83 | quiet_cmd_checksrc = CHECK $< | |
e5d28910 | 84 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< |
7d0ea252 MY |
85 | else ifeq ($(KBUILD_CHECKSRC),2) |
86 | quiet_cmd_force_checksrc = CHECK $< | |
e5d28910 | 87 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< |
1da177e4 LT |
88 | endif |
89 | ||
e27128db | 90 | ifneq ($(KBUILD_EXTRA_WARN),) |
e5d28910 | 91 | cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< |
3a025e1d MW |
92 | endif |
93 | ||
1da177e4 LT |
94 | # Compile C sources (.c) |
95 | # --------------------------------------------------------------------------- | |
96 | ||
1da177e4 | 97 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ |
1e88e415 | 98 | cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS), $(c_flags)) $(DISABLE_LTO) -fverbose-asm -S -o $@ $< |
1da177e4 | 99 | |
767e581d | 100 | $(obj)/%.s: $(src)/%.c FORCE |
1da177e4 LT |
101 | $(call if_changed_dep,cc_s_c) |
102 | ||
23d43848 MY |
103 | quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@ |
104 | cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $< | |
1da177e4 | 105 | |
767e581d | 106 | $(obj)/%.i: $(src)/%.c FORCE |
23d43848 | 107 | $(call if_changed_dep,cpp_i_c) |
1da177e4 | 108 | |
4efca4ed NP |
109 | # These mirror gensymtypes_S and co below, keep them in synch. |
110 | cmd_gensymtypes_c = \ | |
37a8d9f6 | 111 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ |
88110713 | 112 | scripts/genksyms/genksyms $(if $(1), -T $(2)) \ |
56067812 | 113 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ |
37a8d9f6 | 114 | $(if $(KBUILD_PRESERVE),-p) \ |
e26d6b83 | 115 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) |
37a8d9f6 | 116 | |
15fde675 | 117 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ |
37a8d9f6 | 118 | cmd_cc_symtypes_c = \ |
4efca4ed | 119 | $(call cmd_gensymtypes_c,true,$@) >/dev/null; \ |
37a8d9f6 | 120 | test -s $@ || rm -f $@ |
15fde675 | 121 | |
767e581d | 122 | $(obj)/%.symtypes : $(src)/%.c FORCE |
64e6c1e1 | 123 | $(call cmd,cc_symtypes_c) |
15fde675 | 124 | |
433db3e2 VT |
125 | # LLVM assembly |
126 | # Generate .ll files from .c | |
127 | quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ | |
128 | cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $< | |
129 | ||
130 | $(obj)/%.ll: $(src)/%.c FORCE | |
131 | $(call if_changed_dep,cc_ll_c) | |
132 | ||
1da177e4 LT |
133 | # C (.c) files |
134 | # The C file is compiled and updated dependency information is generated. | |
135 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) | |
136 | ||
137 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ | |
ee3e46b7 | 138 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< |
1da177e4 | 139 | |
ee3e46b7 | 140 | ifdef CONFIG_MODVERSIONS |
1da177e4 | 141 | # When module versioning is enabled the following steps are executed: |
ee3e46b7 MY |
142 | # o compile a <file>.o from <file>.c |
143 | # o if <file>.o doesn't contain a __ksymtab version, i.e. does | |
144 | # not export symbols, it's done. | |
1da177e4 LT |
145 | # o otherwise, we calculate symbol versions using the good old |
146 | # genksyms on the preprocessed source and postprocess them in a way | |
2ea03891 | 147 | # that they are usable as a linker script |
ee3e46b7 | 148 | # o generate .tmp_<file>.o from <file>.o using the linker to |
2ea03891 SR |
149 | # replace the unresolved symbols __crc_exported_symbol with |
150 | # the actual value of the checksum generated by genksyms | |
ee3e46b7 | 151 | # o remove .tmp_<file>.o to <file>.o |
4efca4ed NP |
152 | |
153 | cmd_modversions_c = \ | |
ee3e46b7 | 154 | if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \ |
4efca4ed | 155 | $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ |
e26d6b83 DZ |
156 | > $(@D)/.tmp_$(@F:.o=.ver); \ |
157 | \ | |
ee3e46b7 | 158 | $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \ |
e26d6b83 | 159 | -T $(@D)/.tmp_$(@F:.o=.ver); \ |
e26d6b83 | 160 | mv -f $(@D)/.tmp_$(@F) $@; \ |
ee3e46b7 | 161 | rm -f $(@D)/.tmp_$(@F:.o=.ver); \ |
e5d28910 | 162 | fi |
1da177e4 LT |
163 | endif |
164 | ||
8da3821b | 165 | ifdef CONFIG_FTRACE_MCOUNT_RECORD |
07d04081 VG |
166 | ifndef CC_USING_RECORD_MCOUNT |
167 | # compiler will not generate __mcount_loc use recordmcount or recordmcount.pl | |
72441cb1 | 168 | ifdef BUILD_C_RECORDMCOUNT |
85356f80 SR |
169 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") |
170 | RECORDMCOUNT_FLAGS = -w | |
171 | endif | |
d7b4d6de SR |
172 | # Due to recursion, we must skip empty.o. |
173 | # The empty.o file is created in the make process in order to determine | |
312a3d09 C |
174 | # the target endianness and word size. It is made before all other C |
175 | # files, including recordmcount. | |
45677454 WZ |
176 | sub_cmd_record_mcount = \ |
177 | if [ $(@) != "scripts/mod/empty.o" ]; then \ | |
85356f80 | 178 | $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ |
45677454 | 179 | fi; |
d6971822 MM |
180 | recordmcount_source := $(srctree)/scripts/recordmcount.c \ |
181 | $(srctree)/scripts/recordmcount.h | |
72441cb1 | 182 | else |
4317ee3b | 183 | sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ |
e6299d26 | 184 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ |
b3acf29a | 185 | "$(if $(CONFIG_64BIT),64,32)" \ |
5a4630aa | 186 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \ |
d503ac53 | 187 | "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \ |
18c167fd | 188 | "$(if $(part-of-module),1,0)" "$(@)"; |
d6971822 | 189 | recordmcount_source := $(srctree)/scripts/recordmcount.pl |
312a3d09 | 190 | endif # BUILD_C_RECORDMCOUNT |
1a49b2fd JL |
191 | cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \ |
192 | $(sub_cmd_record_mcount)) | |
07d04081 | 193 | endif # CC_USING_RECORD_MCOUNT |
312a3d09 | 194 | endif # CONFIG_FTRACE_MCOUNT_RECORD |
8da3821b | 195 | |
b9ab5ebb | 196 | ifdef CONFIG_STACK_VALIDATION |
3b27a0c8 | 197 | ifneq ($(SKIP_STACK_VALIDATION),1) |
b9ab5ebb JP |
198 | |
199 | __objtool_obj := $(objtree)/tools/objtool/objtool | |
200 | ||
11af8474 | 201 | objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check) |
ee9f8fce | 202 | |
ca41b97e PZ |
203 | objtool_args += $(if $(part-of-module), --module,) |
204 | ||
b9ab5ebb JP |
205 | ifndef CONFIG_FRAME_POINTER |
206 | objtool_args += --no-fp | |
207 | endif | |
867ac9d7 JP |
208 | ifdef CONFIG_GCOV_KERNEL |
209 | objtool_args += --no-unreachable | |
210 | endif | |
b5bc2231 PZ |
211 | ifdef CONFIG_RETPOLINE |
212 | objtool_args += --retpoline | |
213 | endif | |
ea24213d PZ |
214 | ifdef CONFIG_X86_SMAP |
215 | objtool_args += --uaccess | |
216 | endif | |
b5bc2231 | 217 | |
b9ab5ebb JP |
218 | # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory |
219 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file | |
220 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file | |
221 | cmd_objtool = $(if $(patsubst y%,, \ | |
222 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ | |
e5d28910 | 223 | $(__objtool_obj) $(objtool_args) $@) |
b9ab5ebb JP |
224 | objtool_obj = $(if $(patsubst y%,, \ |
225 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ | |
226 | $(__objtool_obj)) | |
227 | ||
3b27a0c8 | 228 | endif # SKIP_STACK_VALIDATION |
b9ab5ebb JP |
229 | endif # CONFIG_STACK_VALIDATION |
230 | ||
ee9f8fce JP |
231 | # Rebuild all objects when objtool changes, or is enabled/disabled. |
232 | objtool_dep = $(objtool_obj) \ | |
233 | $(wildcard include/config/orc/unwinder.h \ | |
234 | include/config/stack/validation.h) | |
235 | ||
bbda5ec6 MY |
236 | ifdef CONFIG_TRIM_UNUSED_KSYMS |
237 | cmd_gen_ksymdeps = \ | |
e5d28910 | 238 | $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd |
bbda5ec6 MY |
239 | endif |
240 | ||
1da177e4 | 241 | define rule_cc_o_c |
3a2429e1 MY |
242 | $(call cmd,checksrc) |
243 | $(call cmd_and_fixdep,cc_o_c) | |
244 | $(call cmd,gen_ksymdeps) | |
245 | $(call cmd,checkdoc) | |
246 | $(call cmd,objtool) | |
247 | $(call cmd,modversions_c) | |
248 | $(call cmd,record_mcount) | |
1da177e4 LT |
249 | endef |
250 | ||
b9ab5ebb | 251 | define rule_as_o_S |
3a2429e1 MY |
252 | $(call cmd_and_fixdep,as_o_S) |
253 | $(call cmd,gen_ksymdeps) | |
254 | $(call cmd,objtool) | |
255 | $(call cmd,modversions_S) | |
b9ab5ebb JP |
256 | endef |
257 | ||
9895c03d NP |
258 | # List module undefined symbols (or empty line if not enabled) |
259 | ifdef CONFIG_TRIM_UNUSED_KSYMS | |
9f69a496 | 260 | cmd_undef_syms = $(NM) $< | sed -n 's/^ *U //p' | xargs echo |
9895c03d NP |
261 | else |
262 | cmd_undef_syms = echo | |
263 | endif | |
264 | ||
1da177e4 | 265 | # Built-in and composite module parts |
ee9f8fce | 266 | $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE |
1da177e4 LT |
267 | $(call cmd,force_checksrc) |
268 | $(call if_changed_rule,cc_o_c) | |
269 | ||
9f69a496 MY |
270 | cmd_mod = { \ |
271 | echo $(if $($*-objs)$($*-y)$($*-m), $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)), $(@:.mod=.o)); \ | |
272 | $(cmd_undef_syms); \ | |
273 | } > $@ | |
274 | ||
275 | $(obj)/%.mod: $(obj)/%.o FORCE | |
276 | $(call if_changed,mod) | |
277 | ||
278 | targets += $(mod-targets) | |
1da177e4 LT |
279 | |
280 | quiet_cmd_cc_lst_c = MKLST $@ | |
281 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ | |
282 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ | |
283 | System.map $(OBJDUMP) > $@ | |
284 | ||
767e581d | 285 | $(obj)/%.lst: $(src)/%.c FORCE |
1da177e4 LT |
286 | $(call if_changed_dep,cc_lst_c) |
287 | ||
288 | # Compile assembler sources (.S) | |
289 | # --------------------------------------------------------------------------- | |
290 | ||
4efca4ed NP |
291 | # .S file exports must have their C prototypes defined in asm/asm-prototypes.h |
292 | # or a file that it includes, in order to get versioned symbols. We build a | |
293 | # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from | |
294 | # the .S file (with trailing ';'), and run genksyms on that, to extract vers. | |
295 | # | |
296 | # This is convoluted. The .S file must first be preprocessed to run guards and | |
297 | # expand names, then the resulting exports must be constructed into plain | |
298 | # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed | |
299 | # to make the genksyms input. | |
300 | # | |
301 | # These mirror gensymtypes_c and co above, keep them in synch. | |
302 | cmd_gensymtypes_S = \ | |
b79c6aa6 | 303 | { echo "\#include <linux/kernel.h>" ; \ |
4efca4ed NP |
304 | echo "\#include <asm/asm-prototypes.h>" ; \ |
305 | $(CPP) $(a_flags) $< | \ | |
cc6acc11 | 306 | grep "\<___EXPORT_SYMBOL\>" | \ |
b79c6aa6 | 307 | sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \ |
4efca4ed | 308 | $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \ |
88110713 | 309 | scripts/genksyms/genksyms $(if $(1), -T $(2)) \ |
56067812 | 310 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ |
4efca4ed NP |
311 | $(if $(KBUILD_PRESERVE),-p) \ |
312 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) | |
313 | ||
314 | quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@ | |
315 | cmd_cc_symtypes_S = \ | |
4efca4ed NP |
316 | $(call cmd_gensymtypes_S,true,$@) >/dev/null; \ |
317 | test -s $@ || rm -f $@ | |
318 | ||
319 | $(obj)/%.symtypes : $(src)/%.S FORCE | |
320 | $(call cmd,cc_symtypes_S) | |
321 | ||
322 | ||
e0f41e52 MY |
323 | quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@ |
324 | cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< | |
1da177e4 | 325 | |
767e581d | 326 | $(obj)/%.s: $(src)/%.S FORCE |
e0f41e52 | 327 | $(call if_changed_dep,cpp_s_S) |
1da177e4 LT |
328 | |
329 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ | |
ee3e46b7 | 330 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< |
4efca4ed | 331 | |
2ff2b7ec | 332 | ifdef CONFIG_ASM_MODVERSIONS |
4efca4ed NP |
333 | |
334 | # versioning matches the C process described above, with difference that | |
335 | # we parse asm-prototypes.h C header to get function definitions. | |
336 | ||
4efca4ed | 337 | cmd_modversions_S = \ |
ee3e46b7 | 338 | if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \ |
4efca4ed NP |
339 | $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ |
340 | > $(@D)/.tmp_$(@F:.o=.ver); \ | |
341 | \ | |
ee3e46b7 | 342 | $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \ |
4efca4ed | 343 | -T $(@D)/.tmp_$(@F:.o=.ver); \ |
4efca4ed | 344 | mv -f $(@D)/.tmp_$(@F) $@; \ |
ee3e46b7 | 345 | rm -f $(@D)/.tmp_$(@F:.o=.ver); \ |
e5d28910 | 346 | fi |
4efca4ed | 347 | endif |
1da177e4 | 348 | |
ee9f8fce | 349 | $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE |
b9ab5ebb | 350 | $(call if_changed_rule,as_o_S) |
1da177e4 | 351 | |
f98fe47c | 352 | targets += $(filter-out $(subdir-obj-y), $(real-obj-y)) $(real-obj-m) $(lib-y) |
5f2fb52f | 353 | targets += $(extra-y) $(always-y) $(MAKECMDGOALS) |
1da177e4 LT |
354 | |
355 | # Linker scripts preprocessor (.lds.S -> .lds) | |
356 | # --------------------------------------------------------------------------- | |
357 | quiet_cmd_cpp_lds_S = LDS $@ | |
5cb0512c | 358 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ |
42f29a25 | 359 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< |
1da177e4 | 360 | |
767e581d | 361 | $(obj)/%.lds: $(src)/%.lds.S FORCE |
1da177e4 LT |
362 | $(call if_changed_dep,cpp_lds_S) |
363 | ||
4520c6a4 DH |
364 | # ASN.1 grammar |
365 | # --------------------------------------------------------------------------- | |
49d5089d | 366 | quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch] |
4520c6a4 | 367 | cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ |
49d5089d | 368 | $(basename $@).c $(basename $@).h |
4520c6a4 | 369 | |
4fa8bc94 | 370 | $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler |
4520c6a4 DH |
371 | $(call cmd,asn1_compiler) |
372 | ||
1da177e4 LT |
373 | # Build the compiled-in targets |
374 | # --------------------------------------------------------------------------- | |
375 | ||
376 | # To build objects in subdirs, we need to descend into the directories | |
a7499267 | 377 | $(obj)/%/built-in.a: $(obj)/% ; |
1da177e4 LT |
378 | |
379 | # | |
dee94953 | 380 | # Rule to compile a set of .o files into one .a file (without symbol table) |
1da177e4 LT |
381 | # |
382 | ifdef builtin-target | |
a5967db9 | 383 | |
5e18f029 | 384 | quiet_cmd_ar_builtin = AR $@ |
13dc8c02 | 385 | cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs) |
1da177e4 | 386 | |
f98fe47c | 387 | $(builtin-target): $(real-obj-y) FORCE |
5e18f029 | 388 | $(call if_changed,ar_builtin) |
1da177e4 LT |
389 | |
390 | targets += $(builtin-target) | |
391 | endif # builtin-target | |
392 | ||
551559e1 TH |
393 | # |
394 | # Rule to create modules.order file | |
395 | # | |
396 | # Create commands to either record .ko file or cat modules.order from | |
397 | # a subdirectory | |
551559e1 | 398 | $(modorder-target): $(subdir-ym) FORCE |
e0e1b1ec MY |
399 | $(Q){ $(foreach m, $(modorder), \ |
400 | $(if $(filter %/modules.order, $m), cat $m, echo $m);) :; } \ | |
401 | | $(AWK) '!x[$$0]++' - > $@ | |
551559e1 | 402 | |
1da177e4 | 403 | # |
dee94953 | 404 | # Rule to compile a set of .o files into one .a file (with symbol table) |
1da177e4 LT |
405 | # |
406 | ifdef lib-target | |
1da177e4 LT |
407 | |
408 | $(lib-target): $(lib-y) FORCE | |
898f5a00 | 409 | $(call if_changed,ar) |
1da177e4 LT |
410 | |
411 | targets += $(lib-target) | |
7f2084fa AV |
412 | |
413 | dummy-object = $(obj)/.lib_exports.o | |
414 | ksyms-lds = $(dot-target).lds | |
7f2084fa AV |
415 | |
416 | quiet_cmd_export_list = EXPORTS $@ | |
417 | cmd_export_list = $(OBJDUMP) -h $< | \ | |
704db543 | 418 | sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/EXTERN(\1)/p' >$(ksyms-lds);\ |
7f2084fa | 419 | rm -f $(dummy-object);\ |
9da2f584 | 420 | echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\ |
7f2084fa AV |
421 | $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\ |
422 | rm $(dummy-object) $(ksyms-lds) | |
423 | ||
424 | $(obj)/lib-ksyms.o: $(lib-target) FORCE | |
425 | $(call if_changed,export_list) | |
989cea5c NP |
426 | |
427 | targets += $(obj)/lib-ksyms.o | |
428 | ||
1da177e4 LT |
429 | endif |
430 | ||
afa974b7 MY |
431 | # NOTE: |
432 | # Do not replace $(filter %.o,^) with $(real-prereqs). When a single object | |
433 | # module is turned into a multi object module, $^ will contain header file | |
434 | # dependencies recorded in the .*.cmd file. | |
1da177e4 | 435 | quiet_cmd_link_multi-m = LD [M] $@ |
b7dca6dd | 436 | cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^) |
1da177e4 | 437 | |
c8589d1e | 438 | $(multi-used-m): FORCE |
1da177e4 | 439 | $(call if_changed,link_multi-m) |
cf4f2193 | 440 | $(call multi_depend, $(multi-used-m), .o, -objs -y -m) |
1da177e4 | 441 | |
f98fe47c | 442 | targets += $(multi-used-m) |
591f6689 | 443 | targets := $(filter-out $(PHONY), $(targets)) |
1da177e4 | 444 | |
b23d1a24 MY |
445 | # Add intermediate targets: |
446 | # When building objects with specific suffix patterns, add intermediate | |
447 | # targets that the final targets are derived from. | |
448 | intermediate_targets = $(foreach sfx, $(2), \ | |
449 | $(patsubst %$(strip $(1)),%$(sfx), \ | |
450 | $(filter %$(strip $(1)), $(targets)))) | |
54a702f7 | 451 | # %.asn1.o <- %.asn1.[ch] <- %.asn1 |
a7f92419 | 452 | # %.dtb.o <- %.dtb.S <- %.dtb <- %.dts |
b23d1a24 MY |
453 | # %.lex.o <- %.lex.c <- %.l |
454 | # %.tab.o <- %.tab.[ch] <- %.y | |
54a702f7 MY |
455 | targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \ |
456 | $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \ | |
a7f92419 | 457 | $(call intermediate_targets, .lex.o, .lex.c) \ |
b23d1a24 MY |
458 | $(call intermediate_targets, .tab.o, .tab.c .tab.h) |
459 | ||
394053f4 MY |
460 | # Build |
461 | # --------------------------------------------------------------------------- | |
462 | ||
463 | ifdef single-build | |
464 | ||
20312629 MY |
465 | KBUILD_SINGLE_TARGETS := $(filter $(obj)/%, $(KBUILD_SINGLE_TARGETS)) |
466 | ||
394053f4 MY |
467 | curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \ |
468 | $(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x)))) | |
469 | ||
470 | # Handle single targets without any rule: show "Nothing to be done for ..." or | |
471 | # "No rule to make target ..." depending on whether the target exists. | |
472 | unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \ | |
20312629 | 473 | $(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS))) |
394053f4 | 474 | |
2dffd23f MY |
475 | single-subdirs := $(foreach d, $(subdir-ym), \ |
476 | $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) | |
477 | ||
478 | __build: $(curdir-single) $(single-subdirs) | |
394053f4 MY |
479 | ifneq ($(unknown-single),) |
480 | $(Q)$(MAKE) -f /dev/null $(unknown-single) | |
481 | endif | |
482 | @: | |
483 | ||
484 | ifeq ($(curdir-single),) | |
485 | # Nothing to do in this directory. Do not include any .*.cmd file for speed-up | |
486 | targets := | |
487 | else | |
488 | targets += $(curdir-single) | |
489 | endif | |
490 | ||
491 | else | |
492 | ||
493 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ | |
494 | $(if $(KBUILD_MODULES),$(obj-m) $(mod-targets) $(modorder-target)) \ | |
5f2fb52f | 495 | $(subdir-ym) $(always-y) |
394053f4 MY |
496 | @: |
497 | ||
498 | endif | |
499 | ||
1da177e4 LT |
500 | # Descending |
501 | # --------------------------------------------------------------------------- | |
502 | ||
4f193362 | 503 | PHONY += $(subdir-ym) |
1da177e4 | 504 | $(subdir-ym): |
d9f78edf | 505 | $(Q)$(MAKE) $(build)=$@ \ |
394053f4 | 506 | $(if $(filter $@/, $(KBUILD_SINGLE_TARGETS)),single-build=) \ |
4f2c8f30 MY |
507 | need-builtin=$(if $(filter $@/built-in.a, $(subdir-obj-y)),1) \ |
508 | need-modorder=$(if $(need-modorder),$(if $(filter $@/modules.order, $(modorder)),1)) | |
1da177e4 LT |
509 | |
510 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
511 | # --------------------------------------------------------------------------- | |
512 | ||
4f193362 | 513 | PHONY += FORCE |
1da177e4 LT |
514 | |
515 | FORCE: | |
516 | ||
517 | # Read all saved command lines and dependencies for the $(targets) we | |
518 | # may be building above, using $(if_changed{,_dep}). As an | |
519 | # optimization, we don't need to read them if the target does not | |
520 | # exist, we will rebuild anyway in that case. | |
521 | ||
392885ee | 522 | existing-targets := $(wildcard $(sort $(targets))) |
1da177e4 | 523 | |
392885ee | 524 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) |
4f193362 | 525 | |
051f278e | 526 | ifdef building_out_of_srctree |
8a78756e MY |
527 | # Create directories for object files if they do not exist |
528 | obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets)))) | |
392885ee MY |
529 | # If targets exist, their directories apparently exist. Skip mkdir. |
530 | existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets)))) | |
531 | obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs))) | |
c4da7ed0 | 532 | ifneq ($(obj-dirs),) |
8a78756e MY |
533 | $(shell mkdir -p $(obj-dirs)) |
534 | endif | |
c4da7ed0 | 535 | endif |
8a78756e | 536 | |
4f193362 | 537 | .PHONY: $(PHONY) |