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Commit | Line | Data |
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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 := | |
5f2fb52f MY |
18 | always-y := |
19 | always-m := | |
d72e5edb SR |
20 | targets := |
21 | subdir-y := | |
22 | subdir-m := | |
23 | EXTRA_AFLAGS := | |
24 | EXTRA_CFLAGS := | |
25 | EXTRA_CPPFLAGS := | |
26 | EXTRA_LDFLAGS := | |
f77bf014 SR |
27 | asflags-y := |
28 | ccflags-y := | |
29 | cppflags-y := | |
30 | ldflags-y := | |
d72e5edb | 31 | |
720097d8 SR |
32 | subdir-asflags-y := |
33 | subdir-ccflags-y := | |
34 | ||
3156fd05 | 35 | # Read auto.conf if it exists, otherwise ignore |
c955ccaf | 36 | -include include/config/auto.conf |
1da177e4 | 37 | |
3204a7fb | 38 | include $(srctree)/scripts/Kbuild.include |
57fd251c | 39 | include $(srctree)/scripts/Makefile.compiler |
20a468b5 | 40 | |
2a691470 | 41 | # The filename Kbuild has precedence over Makefile |
db8c1a7b | 42 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) |
5c816641 | 43 | include $(or $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Makefile) |
0c53c8e6 | 44 | |
3204a7fb | 45 | include $(srctree)/scripts/Makefile.lib |
1da177e4 | 46 | |
85569d19 MY |
47 | # Do not include hostprogs rules unless needed. |
48 | # $(sort ...) is used here to remove duplicated words and excessive spaces. | |
49 | hostprogs := $(sort $(hostprogs)) | |
42640b13 | 50 | ifneq ($(hostprogs),) |
3204a7fb | 51 | include $(srctree)/scripts/Makefile.host |
1da177e4 LT |
52 | endif |
53 | ||
7f3a59db | 54 | # Do not include userprogs rules unless needed. |
85569d19 | 55 | # $(sort ...) is used here to remove duplicated words and excessive spaces. |
7f3a59db MY |
56 | userprogs := $(sort $(userprogs)) |
57 | ifneq ($(userprogs),) | |
3204a7fb | 58 | include $(srctree)/scripts/Makefile.userprogs |
7f3a59db MY |
59 | endif |
60 | ||
1da177e4 LT |
61 | ifndef obj |
62 | $(warning kbuild: Makefile.build is included improperly) | |
63 | endif | |
64 | ||
394053f4 | 65 | ifeq ($(need-modorder),) |
c07d8d47 MY |
66 | ifneq ($(obj-m),) |
67 | $(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.) | |
68 | $(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.) | |
69 | endif | |
70 | endif | |
71 | ||
1da177e4 LT |
72 | # =========================================================================== |
73 | ||
454753d9 | 74 | # subdir-builtin and subdir-modorder may contain duplications. Use $(sort ...) |
aaa385ba | 75 | subdir-builtin := $(sort $(filter %/built-in.a, $(real-obj-y))) |
b2c88554 | 76 | subdir-modorder := $(sort $(filter %/modules.order, $(obj-m))) |
6ba3bcb0 | 77 | |
f3908ab3 MY |
78 | targets-for-builtin := $(extra-y) |
79 | ||
a4954fd7 | 80 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) |
f3908ab3 | 81 | targets-for-builtin += $(obj)/lib.a |
1da177e4 LT |
82 | endif |
83 | ||
56d58936 | 84 | ifdef need-builtin |
f3908ab3 | 85 | targets-for-builtin += $(obj)/built-in.a |
1da177e4 LT |
86 | endif |
87 | ||
fc93a4cd | 88 | targets-for-modules := $(foreach x, o mod $(if $(CONFIG_TRIM_UNUSED_KSYMS), usyms), \ |
9413e764 | 89 | $(patsubst %.o, %.$x, $(filter %.o, $(obj-m)))) |
f3908ab3 | 90 | |
d31ed5d7 PZ |
91 | ifneq ($(CONFIG_LTO_CLANG)$(CONFIG_X86_KERNEL_IBT),) |
92 | targets-for-modules += $(patsubst %.o, %.prelink.o, $(filter %.o, $(obj-m))) | |
ed53a0d9 PZ |
93 | endif |
94 | ||
b480fec9 | 95 | ifdef need-modorder |
f3908ab3 | 96 | targets-for-modules += $(obj)/modules.order |
1d8001ef | 97 | endif |
551559e1 | 98 | |
f3908ab3 | 99 | targets += $(targets-for-builtin) $(targets-for-modules) |
9f69a496 | 100 | |
1da177e4 | 101 | # Linus' kernel sanity checking tool |
7d0ea252 MY |
102 | ifeq ($(KBUILD_CHECKSRC),1) |
103 | quiet_cmd_checksrc = CHECK $< | |
e5d28910 | 104 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< |
7d0ea252 MY |
105 | else ifeq ($(KBUILD_CHECKSRC),2) |
106 | quiet_cmd_force_checksrc = CHECK $< | |
e5d28910 | 107 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< |
1da177e4 LT |
108 | endif |
109 | ||
e27128db | 110 | ifneq ($(KBUILD_EXTRA_WARN),) |
e5d28910 | 111 | cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< |
3a025e1d MW |
112 | endif |
113 | ||
1da177e4 LT |
114 | # Compile C sources (.c) |
115 | # --------------------------------------------------------------------------- | |
116 | ||
1da177e4 | 117 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ |
dc5723b0 | 118 | cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $< |
1da177e4 | 119 | |
767e581d | 120 | $(obj)/%.s: $(src)/%.c FORCE |
1da177e4 LT |
121 | $(call if_changed_dep,cc_s_c) |
122 | ||
23d43848 MY |
123 | quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@ |
124 | cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $< | |
1da177e4 | 125 | |
767e581d | 126 | $(obj)/%.i: $(src)/%.c FORCE |
23d43848 | 127 | $(call if_changed_dep,cpp_i_c) |
1da177e4 | 128 | |
f43e31d5 MY |
129 | genksyms = scripts/genksyms/genksyms \ |
130 | $(if $(1), -T $(2)) \ | |
131 | $(if $(CONFIG_MODULE_REL_CRCS), -R) \ | |
132 | $(if $(KBUILD_PRESERVE), -p) \ | |
133 | -r $(or $(wildcard $(2:.symtypes=.symref)), /dev/null) | |
134 | ||
4efca4ed | 135 | # These mirror gensymtypes_S and co below, keep them in synch. |
f43e31d5 | 136 | cmd_gensymtypes_c = $(CPP) -D__GENKSYMS__ $(c_flags) $< | $(genksyms) |
37a8d9f6 | 137 | |
15fde675 | 138 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ |
dc6dc3e7 | 139 | cmd_cc_symtypes_c = $(call cmd_gensymtypes_c,true,$@) >/dev/null |
15fde675 | 140 | |
767e581d | 141 | $(obj)/%.symtypes : $(src)/%.c FORCE |
64e6c1e1 | 142 | $(call cmd,cc_symtypes_c) |
15fde675 | 143 | |
433db3e2 VT |
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 | ||
1da177e4 LT |
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) $@ | |
92594d56 | 157 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< $(cmd_objtool) |
1da177e4 | 158 | |
ee3e46b7 | 159 | ifdef CONFIG_MODVERSIONS |
1da177e4 | 160 | # When module versioning is enabled the following steps are executed: |
ee3e46b7 MY |
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. | |
1da177e4 LT |
164 | # o otherwise, we calculate symbol versions using the good old |
165 | # genksyms on the preprocessed source and postprocess them in a way | |
2ea03891 | 166 | # that they are usable as a linker script |
ee3e46b7 | 167 | # o generate .tmp_<file>.o from <file>.o using the linker to |
2ea03891 SR |
168 | # replace the unresolved symbols __crc_exported_symbol with |
169 | # the actual value of the checksum generated by genksyms | |
ee3e46b7 | 170 | # o remove .tmp_<file>.o to <file>.o |
4efca4ed | 171 | |
38e89184 ST |
172 | # Generate .o.symversions files for each .o with exported symbols, and link these |
173 | # to the kernel and/or modules at the end. | |
78e9e56a MY |
174 | |
175 | genksyms_format_rel_crc := [^_]*__crc_\([^ ]*\) = \.; LONG(\([^)]*\)).* | |
176 | genksyms_format_normal := __crc_\(.*\) = \(.*\); | |
177 | genksyms_format := $(if $(CONFIG_MODULE_REL_CRCS),$(genksyms_format_rel_crc),$(genksyms_format_normal)) | |
178 | ||
8017ce50 | 179 | gen_symversions = \ |
38e89184 | 180 | if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then \ |
8017ce50 | 181 | $(call cmd_gensymtypes_$(1),$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ |
38e89184 | 182 | > $@.symversions; \ |
78e9e56a MY |
183 | sed -n 's/$(genksyms_format)/$(pound)SYMVER \1 \2/p' $@.symversions \ |
184 | >> $(dot-target).cmd; \ | |
a8390ba9 MY |
185 | else \ |
186 | rm -f $@.symversions; \ | |
8017ce50 MY |
187 | fi |
188 | ||
189 | cmd_gen_symversions_c = $(call gen_symversions,c) | |
190 | ||
191 | cmd_modversions = \ | |
192 | if [ -r $@.symversions ]; then \ | |
ee3e46b7 | 193 | $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \ |
8017ce50 | 194 | -T $@.symversions; \ |
e26d6b83 | 195 | mv -f $(@D)/.tmp_$(@F) $@; \ |
e5d28910 | 196 | fi |
1da177e4 LT |
197 | endif |
198 | ||
3b15cdc1 | 199 | ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT |
07d04081 | 200 | # compiler will not generate __mcount_loc use recordmcount or recordmcount.pl |
72441cb1 | 201 | ifdef BUILD_C_RECORDMCOUNT |
85356f80 SR |
202 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") |
203 | RECORDMCOUNT_FLAGS = -w | |
204 | endif | |
d7b4d6de SR |
205 | # Due to recursion, we must skip empty.o. |
206 | # The empty.o file is created in the make process in order to determine | |
312a3d09 C |
207 | # the target endianness and word size. It is made before all other C |
208 | # files, including recordmcount. | |
45677454 WZ |
209 | sub_cmd_record_mcount = \ |
210 | if [ $(@) != "scripts/mod/empty.o" ]; then \ | |
85356f80 | 211 | $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ |
45677454 | 212 | fi; |
d6971822 MM |
213 | recordmcount_source := $(srctree)/scripts/recordmcount.c \ |
214 | $(srctree)/scripts/recordmcount.h | |
72441cb1 | 215 | else |
4317ee3b | 216 | sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ |
e6299d26 | 217 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ |
b3acf29a | 218 | "$(if $(CONFIG_64BIT),64,32)" \ |
5a4630aa | 219 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \ |
d503ac53 | 220 | "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \ |
18c167fd | 221 | "$(if $(part-of-module),1,0)" "$(@)"; |
d6971822 | 222 | recordmcount_source := $(srctree)/scripts/recordmcount.pl |
312a3d09 | 223 | endif # BUILD_C_RECORDMCOUNT |
1a49b2fd JL |
224 | cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \ |
225 | $(sub_cmd_record_mcount)) | |
3b15cdc1 | 226 | endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT |
8da3821b | 227 | |
b9ab5ebb | 228 | ifdef CONFIG_STACK_VALIDATION |
8f0c32c7 | 229 | |
5c4859e7 MY |
230 | objtool := $(objtree)/tools/objtool/objtool |
231 | ||
8f0c32c7 MY |
232 | objtool_args = \ |
233 | $(if $(CONFIG_UNWINDER_ORC),orc generate,check) \ | |
234 | $(if $(part-of-module), --module) \ | |
ed53a0d9 | 235 | $(if $(CONFIG_X86_KERNEL_IBT), --lto --ibt) \ |
8f0c32c7 MY |
236 | $(if $(CONFIG_FRAME_POINTER),, --no-fp) \ |
237 | $(if $(CONFIG_GCOV_KERNEL)$(CONFIG_LTO_CLANG), --no-unreachable)\ | |
238 | $(if $(CONFIG_RETPOLINE), --retpoline) \ | |
239 | $(if $(CONFIG_X86_SMAP), --uaccess) \ | |
e463a09a PZ |
240 | $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount) \ |
241 | $(if $(CONFIG_SLS), --sls) | |
8f0c32c7 | 242 | |
d31ed5d7 PZ |
243 | cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool_args) $@) |
244 | cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd) | |
90a35349 MY |
245 | |
246 | endif # CONFIG_STACK_VALIDATION | |
247 | ||
d31ed5d7 | 248 | ifneq ($(CONFIG_LTO_CLANG)$(CONFIG_X86_KERNEL_IBT),) |
90a35349 MY |
249 | |
250 | # Skip objtool for LLVM bitcode | |
251 | $(obj)/%.o: objtool-enabled := | |
252 | ||
253 | else | |
b9ab5ebb | 254 | |
b9ab5ebb JP |
255 | # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory |
256 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file | |
257 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file | |
918a6b7f | 258 | |
90a35349 | 259 | $(obj)/%.o: objtool-enabled = $(if $(filter-out y%, \ |
918a6b7f MY |
260 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n),y) |
261 | ||
90a35349 | 262 | endif |
b9ab5ebb | 263 | |
bbda5ec6 MY |
264 | ifdef CONFIG_TRIM_UNUSED_KSYMS |
265 | cmd_gen_ksymdeps = \ | |
e5d28910 | 266 | $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd |
bbda5ec6 MY |
267 | endif |
268 | ||
1da177e4 | 269 | define rule_cc_o_c |
3a2429e1 MY |
270 | $(call cmd_and_fixdep,cc_o_c) |
271 | $(call cmd,gen_ksymdeps) | |
0c33f125 | 272 | $(call cmd,checksrc) |
3a2429e1 | 273 | $(call cmd,checkdoc) |
ef62588c | 274 | $(call cmd,gen_objtooldep) |
8017ce50 MY |
275 | $(call cmd,gen_symversions_c) |
276 | $(if $(CONFIG_LTO_CLANG),,$(call cmd,modversions)) | |
3a2429e1 | 277 | $(call cmd,record_mcount) |
1da177e4 LT |
278 | endef |
279 | ||
b9ab5ebb | 280 | define rule_as_o_S |
3a2429e1 MY |
281 | $(call cmd_and_fixdep,as_o_S) |
282 | $(call cmd,gen_ksymdeps) | |
ef62588c | 283 | $(call cmd,gen_objtooldep) |
7cfa2fcb MY |
284 | $(call cmd,gen_symversions_S) |
285 | $(call cmd,modversions) | |
b9ab5ebb JP |
286 | endef |
287 | ||
1da177e4 | 288 | # Built-in and composite module parts |
ef62588c | 289 | $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE |
1da177e4 | 290 | $(call if_changed_rule,cc_o_c) |
0c33f125 | 291 | $(call cmd,force_checksrc) |
1da177e4 | 292 | |
d31ed5d7 | 293 | ifneq ($(CONFIG_LTO_CLANG)$(CONFIG_X86_KERNEL_IBT),) |
850ded46 ST |
294 | # Module .o files may contain LLVM bitcode, compile them into native code |
295 | # before ELF processing | |
d31ed5d7 PZ |
296 | quiet_cmd_cc_prelink_modules = LD [M] $@ |
297 | cmd_cc_prelink_modules = \ | |
850ded46 | 298 | $(LD) $(ld_flags) -r -o $@ \ |
d31ed5d7 PZ |
299 | $(shell [ -s $(@:.prelink.o=.o.symversions) ] && \ |
300 | echo -T $(@:.prelink.o=.o.symversions)) \ | |
90a35349 MY |
301 | --whole-archive $(filter-out FORCE,$^) \ |
302 | $(cmd_objtool) | |
850ded46 | 303 | |
d31ed5d7 PZ |
304 | # objtool was skipped for LLVM bitcode, run it now that we have compiled |
305 | # modules into native code | |
306 | $(obj)/%.prelink.o: objtool-enabled = y | |
307 | $(obj)/%.prelink.o: part-of-module := y | |
308 | ||
309 | $(obj)/%.prelink.o: $(obj)/%.o FORCE | |
310 | $(call if_changed,cc_prelink_modules) | |
850ded46 ST |
311 | endif |
312 | ||
22f26f21 MY |
313 | cmd_mod = echo $(addprefix $(obj)/, $(call real-search, $*.o, .o, -objs -y -m)) | \ |
314 | $(AWK) -v RS='( |\n)' '!x[$$0]++' > $@ | |
9f69a496 | 315 | |
fc93a4cd | 316 | $(obj)/%.mod: FORCE |
9f69a496 MY |
317 | $(call if_changed,mod) |
318 | ||
9413e764 MY |
319 | # List module undefined symbols |
320 | cmd_undefined_syms = $(NM) $< | sed -n 's/^ *U //p' > $@ | |
321 | ||
322 | $(obj)/%.usyms: $(obj)/%$(mod-prelink-ext).o FORCE | |
323 | $(call if_changed,undefined_syms) | |
324 | ||
1da177e4 LT |
325 | quiet_cmd_cc_lst_c = MKLST $@ |
326 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ | |
327 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ | |
328 | System.map $(OBJDUMP) > $@ | |
329 | ||
767e581d | 330 | $(obj)/%.lst: $(src)/%.c FORCE |
1da177e4 LT |
331 | $(call if_changed_dep,cc_lst_c) |
332 | ||
333 | # Compile assembler sources (.S) | |
334 | # --------------------------------------------------------------------------- | |
335 | ||
4efca4ed NP |
336 | # .S file exports must have their C prototypes defined in asm/asm-prototypes.h |
337 | # or a file that it includes, in order to get versioned symbols. We build a | |
338 | # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from | |
339 | # the .S file (with trailing ';'), and run genksyms on that, to extract vers. | |
340 | # | |
341 | # This is convoluted. The .S file must first be preprocessed to run guards and | |
342 | # expand names, then the resulting exports must be constructed into plain | |
343 | # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed | |
344 | # to make the genksyms input. | |
345 | # | |
346 | # These mirror gensymtypes_c and co above, keep them in synch. | |
347 | cmd_gensymtypes_S = \ | |
b79c6aa6 | 348 | { echo "\#include <linux/kernel.h>" ; \ |
4efca4ed NP |
349 | echo "\#include <asm/asm-prototypes.h>" ; \ |
350 | $(CPP) $(a_flags) $< | \ | |
cc6acc11 | 351 | grep "\<___EXPORT_SYMBOL\>" | \ |
b79c6aa6 | 352 | sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \ |
f43e31d5 | 353 | $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms) |
4efca4ed NP |
354 | |
355 | quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@ | |
dc6dc3e7 | 356 | cmd_cc_symtypes_S = $(call cmd_gensymtypes_S,true,$@) >/dev/null |
4efca4ed NP |
357 | |
358 | $(obj)/%.symtypes : $(src)/%.S FORCE | |
359 | $(call cmd,cc_symtypes_S) | |
360 | ||
361 | ||
e0f41e52 MY |
362 | quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@ |
363 | cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< | |
1da177e4 | 364 | |
767e581d | 365 | $(obj)/%.s: $(src)/%.S FORCE |
e0f41e52 | 366 | $(call if_changed_dep,cpp_s_S) |
1da177e4 LT |
367 | |
368 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ | |
92594d56 | 369 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool) |
4efca4ed | 370 | |
2ff2b7ec | 371 | ifdef CONFIG_ASM_MODVERSIONS |
4efca4ed NP |
372 | |
373 | # versioning matches the C process described above, with difference that | |
374 | # we parse asm-prototypes.h C header to get function definitions. | |
375 | ||
7cfa2fcb MY |
376 | cmd_gen_symversions_S = $(call gen_symversions,S) |
377 | ||
4efca4ed | 378 | endif |
1da177e4 | 379 | |
ef62588c | 380 | $(obj)/%.o: $(src)/%.S FORCE |
b9ab5ebb | 381 | $(call if_changed_rule,as_o_S) |
1da177e4 | 382 | |
b2c88554 MY |
383 | targets += $(filter-out $(subdir-builtin), $(real-obj-y)) |
384 | targets += $(filter-out $(subdir-modorder), $(real-obj-m)) | |
bcf0c664 | 385 | targets += $(real-dtb-y) $(lib-y) $(always-y) $(MAKECMDGOALS) |
1da177e4 LT |
386 | |
387 | # Linker scripts preprocessor (.lds.S -> .lds) | |
388 | # --------------------------------------------------------------------------- | |
389 | quiet_cmd_cpp_lds_S = LDS $@ | |
5cb0512c | 390 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ |
42f29a25 | 391 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< |
1da177e4 | 392 | |
767e581d | 393 | $(obj)/%.lds: $(src)/%.lds.S FORCE |
1da177e4 LT |
394 | $(call if_changed_dep,cpp_lds_S) |
395 | ||
4520c6a4 DH |
396 | # ASN.1 grammar |
397 | # --------------------------------------------------------------------------- | |
49d5089d | 398 | quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch] |
4520c6a4 | 399 | cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ |
49d5089d | 400 | $(basename $@).c $(basename $@).h |
4520c6a4 | 401 | |
4fa8bc94 | 402 | $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler |
4520c6a4 DH |
403 | $(call cmd,asn1_compiler) |
404 | ||
1da177e4 LT |
405 | # Build the compiled-in targets |
406 | # --------------------------------------------------------------------------- | |
407 | ||
408 | # To build objects in subdirs, we need to descend into the directories | |
aaa385ba | 409 | $(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ; |
454753d9 | 410 | $(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ; |
1da177e4 | 411 | |
38e89184 | 412 | # combine symversions for later processing |
38e89184 ST |
413 | ifeq ($(CONFIG_LTO_CLANG) $(CONFIG_MODVERSIONS),y y) |
414 | cmd_update_lto_symversions = \ | |
415 | rm -f $@.symversions \ | |
416 | $(foreach n, $(filter-out FORCE,$^), \ | |
1d11053d | 417 | $(if $(shell test -s $(n).symversions && echo y), \ |
38e89184 ST |
418 | ; cat $(n).symversions >> $@.symversions)) |
419 | else | |
420 | cmd_update_lto_symversions = echo >/dev/null | |
421 | endif | |
422 | ||
1da177e4 | 423 | # |
dee94953 | 424 | # Rule to compile a set of .o files into one .a file (without symbol table) |
1da177e4 | 425 | # |
a5967db9 | 426 | |
5e18f029 | 427 | quiet_cmd_ar_builtin = AR $@ |
13dc8c02 | 428 | cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs) |
1da177e4 | 429 | |
38e89184 ST |
430 | quiet_cmd_ar_and_symver = AR $@ |
431 | cmd_ar_and_symver = $(cmd_update_lto_symversions); $(cmd_ar_builtin) | |
432 | ||
e578edc7 | 433 | $(obj)/built-in.a: $(real-obj-y) FORCE |
38e89184 | 434 | $(call if_changed,ar_and_symver) |
1da177e4 | 435 | |
551559e1 TH |
436 | # |
437 | # Rule to create modules.order file | |
438 | # | |
439 | # Create commands to either record .ko file or cat modules.order from | |
440 | # a subdirectory | |
b2c88554 MY |
441 | # Add $(obj-m) as the prerequisite to avoid updating the timestamp of |
442 | # modules.order unless contained modules are updated. | |
443 | ||
444 | cmd_modules_order = { $(foreach m, $(real-prereqs), \ | |
445 | $(if $(filter %/modules.order, $m), cat $m, echo $(patsubst %.o,%.ko,$m));) :; } \ | |
e0e1b1ec | 446 | | $(AWK) '!x[$$0]++' - > $@ |
551559e1 | 447 | |
b2c88554 MY |
448 | $(obj)/modules.order: $(obj-m) FORCE |
449 | $(call if_changed,modules_order) | |
450 | ||
1da177e4 | 451 | # |
dee94953 | 452 | # Rule to compile a set of .o files into one .a file (with symbol table) |
1da177e4 | 453 | # |
38e89184 ST |
454 | quiet_cmd_ar_lib = AR $@ |
455 | cmd_ar_lib = $(cmd_update_lto_symversions); $(cmd_ar) | |
456 | ||
e578edc7 | 457 | $(obj)/lib.a: $(lib-y) FORCE |
38e89184 | 458 | $(call if_changed,ar_lib) |
1da177e4 | 459 | |
d31ed5d7 | 460 | ifneq ($(CONFIG_LTO_CLANG)$(CONFIG_X86_KERNEL_IBT),) |
dc5723b0 ST |
461 | quiet_cmd_link_multi-m = AR [M] $@ |
462 | cmd_link_multi-m = \ | |
38e89184 | 463 | $(cmd_update_lto_symversions); \ |
dc5723b0 | 464 | rm -f $@; \ |
feb7d79f | 465 | $(AR) cDPrsT $@ @$(patsubst %.o,%.mod,$@) |
dc5723b0 | 466 | else |
1da177e4 | 467 | quiet_cmd_link_multi-m = LD [M] $@ |
feb7d79f | 468 | cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ @$(patsubst %.o,%.mod,$@) |
dc5723b0 | 469 | endif |
1da177e4 | 470 | |
feb7d79f | 471 | $(multi-obj-m): %.o: %.mod FORCE |
1da177e4 | 472 | $(call if_changed,link_multi-m) |
a6601e01 | 473 | $(call multi_depend, $(multi-obj-m), .o, -objs -y -m) |
1da177e4 | 474 | |
591f6689 | 475 | targets := $(filter-out $(PHONY), $(targets)) |
1da177e4 | 476 | |
b23d1a24 MY |
477 | # Add intermediate targets: |
478 | # When building objects with specific suffix patterns, add intermediate | |
479 | # targets that the final targets are derived from. | |
480 | intermediate_targets = $(foreach sfx, $(2), \ | |
481 | $(patsubst %$(strip $(1)),%$(sfx), \ | |
482 | $(filter %$(strip $(1)), $(targets)))) | |
54a702f7 | 483 | # %.asn1.o <- %.asn1.[ch] <- %.asn1 |
a7f92419 | 484 | # %.dtb.o <- %.dtb.S <- %.dtb <- %.dts |
b23d1a24 MY |
485 | # %.lex.o <- %.lex.c <- %.l |
486 | # %.tab.o <- %.tab.[ch] <- %.y | |
54a702f7 MY |
487 | targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \ |
488 | $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \ | |
a7f92419 | 489 | $(call intermediate_targets, .lex.o, .lex.c) \ |
b23d1a24 MY |
490 | $(call intermediate_targets, .tab.o, .tab.c .tab.h) |
491 | ||
394053f4 MY |
492 | # Build |
493 | # --------------------------------------------------------------------------- | |
494 | ||
495 | ifdef single-build | |
496 | ||
20312629 MY |
497 | KBUILD_SINGLE_TARGETS := $(filter $(obj)/%, $(KBUILD_SINGLE_TARGETS)) |
498 | ||
394053f4 MY |
499 | curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \ |
500 | $(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x)))) | |
501 | ||
502 | # Handle single targets without any rule: show "Nothing to be done for ..." or | |
503 | # "No rule to make target ..." depending on whether the target exists. | |
504 | unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \ | |
20312629 | 505 | $(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS))) |
394053f4 | 506 | |
2dffd23f MY |
507 | single-subdirs := $(foreach d, $(subdir-ym), \ |
508 | $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) | |
509 | ||
510 | __build: $(curdir-single) $(single-subdirs) | |
394053f4 MY |
511 | ifneq ($(unknown-single),) |
512 | $(Q)$(MAKE) -f /dev/null $(unknown-single) | |
513 | endif | |
514 | @: | |
515 | ||
516 | ifeq ($(curdir-single),) | |
517 | # Nothing to do in this directory. Do not include any .*.cmd file for speed-up | |
518 | targets := | |
519 | else | |
520 | targets += $(curdir-single) | |
521 | endif | |
522 | ||
523 | else | |
524 | ||
f3908ab3 MY |
525 | __build: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \ |
526 | $(if $(KBUILD_MODULES), $(targets-for-modules)) \ | |
5f2fb52f | 527 | $(subdir-ym) $(always-y) |
394053f4 MY |
528 | @: |
529 | ||
530 | endif | |
531 | ||
1da177e4 LT |
532 | # Descending |
533 | # --------------------------------------------------------------------------- | |
534 | ||
4f193362 | 535 | PHONY += $(subdir-ym) |
1da177e4 | 536 | $(subdir-ym): |
d9f78edf | 537 | $(Q)$(MAKE) $(build)=$@ \ |
394053f4 | 538 | $(if $(filter $@/, $(KBUILD_SINGLE_TARGETS)),single-build=) \ |
aaa385ba | 539 | need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \ |
454753d9 | 540 | need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1) |
1da177e4 LT |
541 | |
542 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
543 | # --------------------------------------------------------------------------- | |
544 | ||
4f193362 | 545 | PHONY += FORCE |
1da177e4 LT |
546 | |
547 | FORCE: | |
548 | ||
549 | # Read all saved command lines and dependencies for the $(targets) we | |
550 | # may be building above, using $(if_changed{,_dep}). As an | |
551 | # optimization, we don't need to read them if the target does not | |
552 | # exist, we will rebuild anyway in that case. | |
553 | ||
392885ee | 554 | existing-targets := $(wildcard $(sort $(targets))) |
1da177e4 | 555 | |
392885ee | 556 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) |
4f193362 | 557 | |
8a78756e | 558 | # Create directories for object files if they do not exist |
cc8a51ca | 559 | obj-dirs := $(sort $(patsubst %/,%, $(dir $(targets)))) |
392885ee MY |
560 | # If targets exist, their directories apparently exist. Skip mkdir. |
561 | existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets)))) | |
562 | obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs))) | |
c4da7ed0 | 563 | ifneq ($(obj-dirs),) |
8a78756e MY |
564 | $(shell mkdir -p $(obj-dirs)) |
565 | endif | |
566 | ||
4f193362 | 567 | .PHONY: $(PHONY) |