Commit | Line | Data |
---|---|---|
b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | # ========================================================================== |
3 | # Building | |
4 | # ========================================================================== | |
5 | ||
6 | src := $(obj) | |
7 | ||
cc306abd MY |
8 | PHONY := $(obj)/ |
9 | $(obj)/: | |
1da177e4 | 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 := | |
2f7ab126 | 29 | rustflags-y := |
f77bf014 SR |
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 | |
3204a7fb | 39 | include $(srctree)/scripts/Kbuild.include |
57fd251c | 40 | include $(srctree)/scripts/Makefile.compiler |
20a468b5 | 41 | |
2a691470 | 42 | # The filename Kbuild has precedence over Makefile |
db8c1a7b | 43 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) |
5c816641 | 44 | include $(or $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Makefile) |
0c53c8e6 | 45 | |
3204a7fb | 46 | include $(srctree)/scripts/Makefile.lib |
1da177e4 | 47 | |
85569d19 MY |
48 | # Do not include hostprogs rules unless needed. |
49 | # $(sort ...) is used here to remove duplicated words and excessive spaces. | |
50 | hostprogs := $(sort $(hostprogs)) | |
42640b13 | 51 | ifneq ($(hostprogs),) |
3204a7fb | 52 | include $(srctree)/scripts/Makefile.host |
1da177e4 LT |
53 | endif |
54 | ||
7f3a59db | 55 | # Do not include userprogs rules unless needed. |
85569d19 | 56 | # $(sort ...) is used here to remove duplicated words and excessive spaces. |
7f3a59db MY |
57 | userprogs := $(sort $(userprogs)) |
58 | ifneq ($(userprogs),) | |
3204a7fb | 59 | include $(srctree)/scripts/Makefile.userprogs |
7f3a59db MY |
60 | endif |
61 | ||
1da177e4 LT |
62 | ifndef obj |
63 | $(warning kbuild: Makefile.build is included improperly) | |
64 | endif | |
65 | ||
394053f4 | 66 | ifeq ($(need-modorder),) |
c07d8d47 MY |
67 | ifneq ($(obj-m),) |
68 | $(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.) | |
69 | $(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.) | |
70 | endif | |
71 | endif | |
72 | ||
1da177e4 LT |
73 | # =========================================================================== |
74 | ||
454753d9 | 75 | # subdir-builtin and subdir-modorder may contain duplications. Use $(sort ...) |
aaa385ba | 76 | subdir-builtin := $(sort $(filter %/built-in.a, $(real-obj-y))) |
b2c88554 | 77 | subdir-modorder := $(sort $(filter %/modules.order, $(obj-m))) |
6ba3bcb0 | 78 | |
f3908ab3 MY |
79 | targets-for-builtin := $(extra-y) |
80 | ||
a4954fd7 | 81 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) |
f3908ab3 | 82 | targets-for-builtin += $(obj)/lib.a |
1da177e4 LT |
83 | endif |
84 | ||
56d58936 | 85 | ifdef need-builtin |
f3908ab3 | 86 | targets-for-builtin += $(obj)/built-in.a |
1da177e4 LT |
87 | endif |
88 | ||
fc93a4cd | 89 | targets-for-modules := $(foreach x, o mod $(if $(CONFIG_TRIM_UNUSED_KSYMS), usyms), \ |
9413e764 | 90 | $(patsubst %.o, %.$x, $(filter %.o, $(obj-m)))) |
f3908ab3 | 91 | |
b480fec9 | 92 | ifdef need-modorder |
f3908ab3 | 93 | targets-for-modules += $(obj)/modules.order |
1d8001ef | 94 | endif |
551559e1 | 95 | |
f3908ab3 | 96 | targets += $(targets-for-builtin) $(targets-for-modules) |
9f69a496 | 97 | |
1da177e4 | 98 | # Linus' kernel sanity checking tool |
7d0ea252 MY |
99 | ifeq ($(KBUILD_CHECKSRC),1) |
100 | quiet_cmd_checksrc = CHECK $< | |
e5d28910 | 101 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< |
7d0ea252 MY |
102 | else ifeq ($(KBUILD_CHECKSRC),2) |
103 | quiet_cmd_force_checksrc = CHECK $< | |
e5d28910 | 104 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< |
1da177e4 LT |
105 | endif |
106 | ||
e27128db | 107 | ifneq ($(KBUILD_EXTRA_WARN),) |
e5d28910 | 108 | cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< |
3a025e1d MW |
109 | endif |
110 | ||
1da177e4 LT |
111 | # Compile C sources (.c) |
112 | # --------------------------------------------------------------------------- | |
113 | ||
1da177e4 | 114 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ |
dc5723b0 | 115 | cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $< |
1da177e4 | 116 | |
767e581d | 117 | $(obj)/%.s: $(src)/%.c FORCE |
1da177e4 LT |
118 | $(call if_changed_dep,cc_s_c) |
119 | ||
23d43848 MY |
120 | quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@ |
121 | cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $< | |
1da177e4 | 122 | |
767e581d | 123 | $(obj)/%.i: $(src)/%.c FORCE |
23d43848 | 124 | $(call if_changed_dep,cpp_i_c) |
1da177e4 | 125 | |
f43e31d5 MY |
126 | genksyms = scripts/genksyms/genksyms \ |
127 | $(if $(1), -T $(2)) \ | |
f43e31d5 MY |
128 | $(if $(KBUILD_PRESERVE), -p) \ |
129 | -r $(or $(wildcard $(2:.symtypes=.symref)), /dev/null) | |
130 | ||
4efca4ed | 131 | # These mirror gensymtypes_S and co below, keep them in synch. |
f43e31d5 | 132 | cmd_gensymtypes_c = $(CPP) -D__GENKSYMS__ $(c_flags) $< | $(genksyms) |
37a8d9f6 | 133 | |
15fde675 | 134 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ |
dc6dc3e7 | 135 | cmd_cc_symtypes_c = $(call cmd_gensymtypes_c,true,$@) >/dev/null |
15fde675 | 136 | |
767e581d | 137 | $(obj)/%.symtypes : $(src)/%.c FORCE |
64e6c1e1 | 138 | $(call cmd,cc_symtypes_c) |
15fde675 | 139 | |
433db3e2 VT |
140 | # LLVM assembly |
141 | # Generate .ll files from .c | |
142 | quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ | |
143 | cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $< | |
144 | ||
145 | $(obj)/%.ll: $(src)/%.c FORCE | |
146 | $(call if_changed_dep,cc_ll_c) | |
147 | ||
1da177e4 LT |
148 | # C (.c) files |
149 | # The C file is compiled and updated dependency information is generated. | |
150 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) | |
151 | ||
c25e1c55 MY |
152 | is-single-obj-m = $(and $(part-of-module),$(filter $@, $(obj-m)),y) |
153 | ||
154 | # When a module consists of a single object, there is no reason to keep LLVM IR. | |
155 | # Make $(LD) covert LLVM IR to ELF here. | |
156 | ifdef CONFIG_LTO_CLANG | |
157 | cmd_ld_single_m = $(if $(is-single-obj-m), ; $(LD) $(ld_flags) -r -o $(tmp-target) $@; mv $(tmp-target) $@) | |
158 | endif | |
159 | ||
1da177e4 | 160 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ |
c25e1c55 MY |
161 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< \ |
162 | $(cmd_ld_single_m) \ | |
163 | $(cmd_objtool) | |
1da177e4 | 164 | |
ee3e46b7 | 165 | ifdef CONFIG_MODVERSIONS |
1da177e4 | 166 | # When module versioning is enabled the following steps are executed: |
ee3e46b7 MY |
167 | # o compile a <file>.o from <file>.c |
168 | # o if <file>.o doesn't contain a __ksymtab version, i.e. does | |
169 | # not export symbols, it's done. | |
1da177e4 | 170 | # o otherwise, we calculate symbol versions using the good old |
7b453719 MY |
171 | # genksyms on the preprocessed source and dump them into the .cmd file. |
172 | # o modpost will extract versions from that file and create *.c files that will | |
173 | # be compiled and linked to the kernel and/or modules. | |
4efca4ed | 174 | |
8017ce50 | 175 | gen_symversions = \ |
38e89184 | 176 | if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then \ |
8017ce50 | 177 | $(call cmd_gensymtypes_$(1),$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ |
78e9e56a | 178 | >> $(dot-target).cmd; \ |
e5d28910 | 179 | fi |
8017ce50 MY |
180 | |
181 | cmd_gen_symversions_c = $(call gen_symversions,c) | |
182 | ||
38e89184 | 183 | endif |
1da177e4 | 184 | |
3b15cdc1 | 185 | ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT |
07d04081 | 186 | # compiler will not generate __mcount_loc use recordmcount or recordmcount.pl |
72441cb1 | 187 | ifdef BUILD_C_RECORDMCOUNT |
85356f80 SR |
188 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") |
189 | RECORDMCOUNT_FLAGS = -w | |
190 | endif | |
d7b4d6de SR |
191 | # Due to recursion, we must skip empty.o. |
192 | # The empty.o file is created in the make process in order to determine | |
312a3d09 C |
193 | # the target endianness and word size. It is made before all other C |
194 | # files, including recordmcount. | |
45677454 WZ |
195 | sub_cmd_record_mcount = \ |
196 | if [ $(@) != "scripts/mod/empty.o" ]; then \ | |
85356f80 | 197 | $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ |
45677454 | 198 | fi; |
d6971822 MM |
199 | recordmcount_source := $(srctree)/scripts/recordmcount.c \ |
200 | $(srctree)/scripts/recordmcount.h | |
72441cb1 | 201 | else |
4317ee3b | 202 | sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ |
e6299d26 | 203 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ |
b3acf29a | 204 | "$(if $(CONFIG_64BIT),64,32)" \ |
5a4630aa | 205 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \ |
d503ac53 | 206 | "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \ |
18c167fd | 207 | "$(if $(part-of-module),1,0)" "$(@)"; |
d6971822 | 208 | recordmcount_source := $(srctree)/scripts/recordmcount.pl |
312a3d09 | 209 | endif # BUILD_C_RECORDMCOUNT |
1a49b2fd JL |
210 | cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \ |
211 | $(sub_cmd_record_mcount)) | |
3b15cdc1 | 212 | endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT |
8da3821b | 213 | |
b9ab5ebb JP |
214 | # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory |
215 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file | |
216 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file | |
918a6b7f | 217 | |
c25e1c55 | 218 | is-standard-object = $(if $(filter-out y%, $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n),y) |
918a6b7f | 219 | |
c25e1c55 | 220 | $(obj)/%.o: objtool-enabled = $(if $(is-standard-object),$(if $(delay-objtool),$(is-single-obj-m),y)) |
b9ab5ebb | 221 | |
bbda5ec6 MY |
222 | ifdef CONFIG_TRIM_UNUSED_KSYMS |
223 | cmd_gen_ksymdeps = \ | |
e5d28910 | 224 | $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd |
bbda5ec6 MY |
225 | endif |
226 | ||
31cb50b5 MY |
227 | cmd_check_local_export = $(srctree)/scripts/check-local-export $@ |
228 | ||
1da177e4 | 229 | define rule_cc_o_c |
3a2429e1 MY |
230 | $(call cmd_and_fixdep,cc_o_c) |
231 | $(call cmd,gen_ksymdeps) | |
31cb50b5 | 232 | $(call cmd,check_local_export) |
0c33f125 | 233 | $(call cmd,checksrc) |
3a2429e1 | 234 | $(call cmd,checkdoc) |
ef62588c | 235 | $(call cmd,gen_objtooldep) |
8017ce50 | 236 | $(call cmd,gen_symversions_c) |
3a2429e1 | 237 | $(call cmd,record_mcount) |
1da177e4 LT |
238 | endef |
239 | ||
b9ab5ebb | 240 | define rule_as_o_S |
3a2429e1 MY |
241 | $(call cmd_and_fixdep,as_o_S) |
242 | $(call cmd,gen_ksymdeps) | |
31cb50b5 | 243 | $(call cmd,check_local_export) |
ef62588c | 244 | $(call cmd,gen_objtooldep) |
7cfa2fcb | 245 | $(call cmd,gen_symversions_S) |
b9ab5ebb JP |
246 | endef |
247 | ||
1da177e4 | 248 | # Built-in and composite module parts |
ef62588c | 249 | $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE |
1da177e4 | 250 | $(call if_changed_rule,cc_o_c) |
0c33f125 | 251 | $(call cmd,force_checksrc) |
1da177e4 | 252 | |
c6031b1d MY |
253 | # To make this rule robust against "Argument list too long" error, |
254 | # ensure to add $(obj)/ prefix by a shell command. | |
7bf179de KL |
255 | cmd_mod = printf '%s\n' $(call real-search, $*.o, .o, -objs -y -m) | \ |
256 | $(AWK) '!x[$$0]++ { print("$(obj)/"$$0) }' > $@ | |
9f69a496 | 257 | |
fc93a4cd | 258 | $(obj)/%.mod: FORCE |
9f69a496 MY |
259 | $(call if_changed,mod) |
260 | ||
9413e764 MY |
261 | # List module undefined symbols |
262 | cmd_undefined_syms = $(NM) $< | sed -n 's/^ *U //p' > $@ | |
263 | ||
c25e1c55 | 264 | $(obj)/%.usyms: $(obj)/%.o FORCE |
9413e764 MY |
265 | $(call if_changed,undefined_syms) |
266 | ||
1da177e4 LT |
267 | quiet_cmd_cc_lst_c = MKLST $@ |
268 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ | |
269 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ | |
270 | System.map $(OBJDUMP) > $@ | |
271 | ||
767e581d | 272 | $(obj)/%.lst: $(src)/%.c FORCE |
1da177e4 LT |
273 | $(call if_changed_dep,cc_lst_c) |
274 | ||
2f7ab126 MO |
275 | # Compile Rust sources (.rs) |
276 | # --------------------------------------------------------------------------- | |
277 | ||
278 | rust_allowed_features := core_ffi_c | |
279 | ||
280 | rust_common_cmd = \ | |
281 | RUST_MODFILE=$(modfile) $(RUSTC_OR_CLIPPY) $(rust_flags) \ | |
282 | -Zallow-features=$(rust_allowed_features) \ | |
283 | -Zcrate-attr=no_std \ | |
284 | -Zcrate-attr='feature($(rust_allowed_features))' \ | |
285 | --extern alloc --extern kernel \ | |
286 | --crate-type rlib --out-dir $(obj) -L $(objtree)/rust/ \ | |
287 | --crate-name $(basename $(notdir $@)) | |
288 | ||
289 | rust_handle_depfile = \ | |
290 | mv $(obj)/$(basename $(notdir $@)).d $(depfile); \ | |
291 | sed -i '/^\#/d' $(depfile) | |
292 | ||
293 | # `--emit=obj`, `--emit=asm` and `--emit=llvm-ir` imply a single codegen unit | |
294 | # will be used. We explicitly request `-Ccodegen-units=1` in any case, and | |
295 | # the compiler shows a warning if it is not 1. However, if we ever stop | |
296 | # requesting it explicitly and we start using some other `--emit` that does not | |
297 | # imply it (and for which codegen is performed), then we would be out of sync, | |
298 | # i.e. the outputs we would get for the different single targets (e.g. `.ll`) | |
299 | # would not match each other. | |
300 | ||
301 | quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ | |
302 | cmd_rustc_o_rs = \ | |
303 | $(rust_common_cmd) --emit=dep-info,obj $<; \ | |
304 | $(rust_handle_depfile) | |
305 | ||
306 | $(obj)/%.o: $(src)/%.rs FORCE | |
307 | $(call if_changed_dep,rustc_o_rs) | |
308 | ||
309 | quiet_cmd_rustc_rsi_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ | |
310 | cmd_rustc_rsi_rs = \ | |
311 | $(rust_common_cmd) --emit=dep-info -Zunpretty=expanded $< >$@; \ | |
312 | command -v $(RUSTFMT) >/dev/null && $(RUSTFMT) $@; \ | |
313 | $(rust_handle_depfile) | |
314 | ||
315 | $(obj)/%.rsi: $(src)/%.rs FORCE | |
316 | $(call if_changed_dep,rustc_rsi_rs) | |
317 | ||
318 | quiet_cmd_rustc_s_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ | |
319 | cmd_rustc_s_rs = \ | |
320 | $(rust_common_cmd) --emit=dep-info,asm $<; \ | |
321 | $(rust_handle_depfile) | |
322 | ||
323 | $(obj)/%.s: $(src)/%.rs FORCE | |
324 | $(call if_changed_dep,rustc_s_rs) | |
325 | ||
326 | quiet_cmd_rustc_ll_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ | |
327 | cmd_rustc_ll_rs = \ | |
328 | $(rust_common_cmd) --emit=dep-info,llvm-ir $<; \ | |
329 | $(rust_handle_depfile) | |
330 | ||
331 | $(obj)/%.ll: $(src)/%.rs FORCE | |
332 | $(call if_changed_dep,rustc_ll_rs) | |
333 | ||
1da177e4 LT |
334 | # Compile assembler sources (.S) |
335 | # --------------------------------------------------------------------------- | |
336 | ||
4efca4ed NP |
337 | # .S file exports must have their C prototypes defined in asm/asm-prototypes.h |
338 | # or a file that it includes, in order to get versioned symbols. We build a | |
339 | # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from | |
340 | # the .S file (with trailing ';'), and run genksyms on that, to extract vers. | |
341 | # | |
342 | # This is convoluted. The .S file must first be preprocessed to run guards and | |
343 | # expand names, then the resulting exports must be constructed into plain | |
344 | # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed | |
345 | # to make the genksyms input. | |
346 | # | |
347 | # These mirror gensymtypes_c and co above, keep them in synch. | |
348 | cmd_gensymtypes_S = \ | |
b79c6aa6 | 349 | { echo "\#include <linux/kernel.h>" ; \ |
4efca4ed NP |
350 | echo "\#include <asm/asm-prototypes.h>" ; \ |
351 | $(CPP) $(a_flags) $< | \ | |
cc6acc11 | 352 | grep "\<___EXPORT_SYMBOL\>" | \ |
b79c6aa6 | 353 | sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \ |
f43e31d5 | 354 | $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms) |
4efca4ed NP |
355 | |
356 | quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@ | |
dc6dc3e7 | 357 | cmd_cc_symtypes_S = $(call cmd_gensymtypes_S,true,$@) >/dev/null |
4efca4ed NP |
358 | |
359 | $(obj)/%.symtypes : $(src)/%.S FORCE | |
360 | $(call cmd,cc_symtypes_S) | |
361 | ||
362 | ||
e0f41e52 MY |
363 | quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@ |
364 | cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< | |
1da177e4 | 365 | |
767e581d | 366 | $(obj)/%.s: $(src)/%.S FORCE |
e0f41e52 | 367 | $(call if_changed_dep,cpp_s_S) |
1da177e4 LT |
368 | |
369 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ | |
92594d56 | 370 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool) |
4efca4ed | 371 | |
2ff2b7ec | 372 | ifdef CONFIG_ASM_MODVERSIONS |
4efca4ed NP |
373 | |
374 | # versioning matches the C process described above, with difference that | |
375 | # we parse asm-prototypes.h C header to get function definitions. | |
376 | ||
7cfa2fcb MY |
377 | cmd_gen_symversions_S = $(call gen_symversions,S) |
378 | ||
4efca4ed | 379 | endif |
1da177e4 | 380 | |
ef62588c | 381 | $(obj)/%.o: $(src)/%.S FORCE |
b9ab5ebb | 382 | $(call if_changed_rule,as_o_S) |
1da177e4 | 383 | |
b2c88554 MY |
384 | targets += $(filter-out $(subdir-builtin), $(real-obj-y)) |
385 | targets += $(filter-out $(subdir-modorder), $(real-obj-m)) | |
cc306abd | 386 | targets += $(real-dtb-y) $(lib-y) $(always-y) |
1da177e4 LT |
387 | |
388 | # Linker scripts preprocessor (.lds.S -> .lds) | |
389 | # --------------------------------------------------------------------------- | |
390 | quiet_cmd_cpp_lds_S = LDS $@ | |
5cb0512c | 391 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ |
42f29a25 | 392 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< |
1da177e4 | 393 | |
767e581d | 394 | $(obj)/%.lds: $(src)/%.lds.S FORCE |
1da177e4 LT |
395 | $(call if_changed_dep,cpp_lds_S) |
396 | ||
4520c6a4 DH |
397 | # ASN.1 grammar |
398 | # --------------------------------------------------------------------------- | |
49d5089d | 399 | quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch] |
4520c6a4 | 400 | cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ |
49d5089d | 401 | $(basename $@).c $(basename $@).h |
4520c6a4 | 402 | |
4fa8bc94 | 403 | $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler |
4520c6a4 DH |
404 | $(call cmd,asn1_compiler) |
405 | ||
1da177e4 LT |
406 | # Build the compiled-in targets |
407 | # --------------------------------------------------------------------------- | |
408 | ||
409 | # To build objects in subdirs, we need to descend into the directories | |
aaa385ba | 410 | $(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ; |
454753d9 | 411 | $(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ; |
1da177e4 LT |
412 | |
413 | # | |
dee94953 | 414 | # Rule to compile a set of .o files into one .a file (without symbol table) |
1da177e4 | 415 | # |
cd968b97 MY |
416 | # To make this rule robust against "Argument list too long" error, |
417 | # remove $(obj)/ prefix, and restore it by a shell command. | |
a5967db9 | 418 | |
5e18f029 | 419 | quiet_cmd_ar_builtin = AR $@ |
cd968b97 | 420 | cmd_ar_builtin = rm -f $@; \ |
5439d4d4 MY |
421 | $(if $(real-prereqs), printf "$(obj)/%s " $(patsubst $(obj)/%,%,$(real-prereqs)) | xargs) \ |
422 | $(AR) cDPrST $@ | |
1da177e4 | 423 | |
e578edc7 | 424 | $(obj)/built-in.a: $(real-obj-y) FORCE |
7375cbcf | 425 | $(call if_changed,ar_builtin) |
1da177e4 | 426 | |
551559e1 TH |
427 | # |
428 | # Rule to create modules.order file | |
429 | # | |
430 | # Create commands to either record .ko file or cat modules.order from | |
431 | # a subdirectory | |
b2c88554 MY |
432 | # Add $(obj-m) as the prerequisite to avoid updating the timestamp of |
433 | # modules.order unless contained modules are updated. | |
434 | ||
435 | cmd_modules_order = { $(foreach m, $(real-prereqs), \ | |
436 | $(if $(filter %/modules.order, $m), cat $m, echo $(patsubst %.o,%.ko,$m));) :; } \ | |
d724b578 | 437 | > $@ |
551559e1 | 438 | |
b2c88554 MY |
439 | $(obj)/modules.order: $(obj-m) FORCE |
440 | $(call if_changed,modules_order) | |
441 | ||
1da177e4 | 442 | # |
dee94953 | 443 | # Rule to compile a set of .o files into one .a file (with symbol table) |
1da177e4 | 444 | # |
38e89184 | 445 | |
e578edc7 | 446 | $(obj)/lib.a: $(lib-y) FORCE |
7375cbcf | 447 | $(call if_changed,ar) |
1da177e4 | 448 | |
f6b66ca4 MY |
449 | quiet_cmd_ld_multi_m = LD [M] $@ |
450 | cmd_ld_multi_m = $(LD) $(ld_flags) -r -o $@ @$(patsubst %.o,%.mod,$@) $(cmd_objtool) | |
451 | ||
452 | define rule_ld_multi_m | |
453 | $(call cmd_and_savecmd,ld_multi_m) | |
454 | $(call cmd,gen_objtooldep) | |
455 | endef | |
1da177e4 | 456 | |
c25e1c55 MY |
457 | $(multi-obj-m): objtool-enabled := $(delay-objtool) |
458 | $(multi-obj-m): part-of-module := y | |
feb7d79f | 459 | $(multi-obj-m): %.o: %.mod FORCE |
f6b66ca4 | 460 | $(call if_changed_rule,ld_multi_m) |
a6601e01 | 461 | $(call multi_depend, $(multi-obj-m), .o, -objs -y -m) |
1da177e4 | 462 | |
b23d1a24 MY |
463 | # Add intermediate targets: |
464 | # When building objects with specific suffix patterns, add intermediate | |
465 | # targets that the final targets are derived from. | |
466 | intermediate_targets = $(foreach sfx, $(2), \ | |
467 | $(patsubst %$(strip $(1)),%$(sfx), \ | |
468 | $(filter %$(strip $(1)), $(targets)))) | |
54a702f7 | 469 | # %.asn1.o <- %.asn1.[ch] <- %.asn1 |
a7f92419 | 470 | # %.dtb.o <- %.dtb.S <- %.dtb <- %.dts |
b23d1a24 MY |
471 | # %.lex.o <- %.lex.c <- %.l |
472 | # %.tab.o <- %.tab.[ch] <- %.y | |
54a702f7 MY |
473 | targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \ |
474 | $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \ | |
a7f92419 | 475 | $(call intermediate_targets, .lex.o, .lex.c) \ |
b23d1a24 MY |
476 | $(call intermediate_targets, .tab.o, .tab.c .tab.h) |
477 | ||
394053f4 MY |
478 | # Build |
479 | # --------------------------------------------------------------------------- | |
480 | ||
cc306abd MY |
481 | $(obj)/: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \ |
482 | $(if $(KBUILD_MODULES), $(targets-for-modules)) \ | |
483 | $(subdir-ym) $(always-y) | |
394053f4 MY |
484 | @: |
485 | ||
cc306abd MY |
486 | # Single targets |
487 | # --------------------------------------------------------------------------- | |
394053f4 | 488 | |
cc306abd MY |
489 | single-subdirs := $(foreach d, $(subdir-ym), $(if $(filter $d/%, $(MAKECMDGOALS)), $d)) |
490 | single-subdir-goals := $(filter $(addsuffix /%, $(single-subdirs)), $(MAKECMDGOALS)) | |
394053f4 | 491 | |
cc306abd | 492 | $(single-subdir-goals): $(single-subdirs) |
394053f4 MY |
493 | @: |
494 | ||
1da177e4 LT |
495 | # Descending |
496 | # --------------------------------------------------------------------------- | |
497 | ||
4f193362 | 498 | PHONY += $(subdir-ym) |
1da177e4 | 499 | $(subdir-ym): |
d9f78edf | 500 | $(Q)$(MAKE) $(build)=$@ \ |
aaa385ba | 501 | need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \ |
cc306abd MY |
502 | need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1) \ |
503 | $(filter $@/%, $(single-subdir-goals)) | |
1da177e4 LT |
504 | |
505 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
506 | # --------------------------------------------------------------------------- | |
507 | ||
4f193362 | 508 | PHONY += FORCE |
1da177e4 LT |
509 | |
510 | FORCE: | |
511 | ||
cc306abd MY |
512 | targets += $(filter-out $(single-subdir-goals), $(MAKECMDGOALS)) |
513 | targets := $(filter-out $(PHONY), $(targets)) | |
514 | ||
1da177e4 LT |
515 | # Read all saved command lines and dependencies for the $(targets) we |
516 | # may be building above, using $(if_changed{,_dep}). As an | |
517 | # optimization, we don't need to read them if the target does not | |
518 | # exist, we will rebuild anyway in that case. | |
519 | ||
392885ee | 520 | existing-targets := $(wildcard $(sort $(targets))) |
1da177e4 | 521 | |
392885ee | 522 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) |
4f193362 | 523 | |
8a78756e | 524 | # Create directories for object files if they do not exist |
cc8a51ca | 525 | obj-dirs := $(sort $(patsubst %/,%, $(dir $(targets)))) |
392885ee MY |
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), $(obj-dirs))) | |
c4da7ed0 | 529 | ifneq ($(obj-dirs),) |
8a78756e MY |
530 | $(shell mkdir -p $(obj-dirs)) |
531 | endif | |
532 | ||
4f193362 | 533 | .PHONY: $(PHONY) |