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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 := | |
18 | always := | |
19 | targets := | |
20 | subdir-y := | |
21 | subdir-m := | |
22 | EXTRA_AFLAGS := | |
23 | EXTRA_CFLAGS := | |
24 | EXTRA_CPPFLAGS := | |
25 | EXTRA_LDFLAGS := | |
f77bf014 SR |
26 | asflags-y := |
27 | ccflags-y := | |
28 | cppflags-y := | |
29 | ldflags-y := | |
d72e5edb | 30 | |
720097d8 SR |
31 | subdir-asflags-y := |
32 | subdir-ccflags-y := | |
33 | ||
3156fd05 | 34 | # Read auto.conf if it exists, otherwise ignore |
c955ccaf | 35 | -include include/config/auto.conf |
1da177e4 | 36 | |
20a468b5 SR |
37 | include scripts/Kbuild.include |
38 | ||
3156fd05 | 39 | # For backward compatibility check that these variables do not change |
0c53c8e6 SR |
40 | save-cflags := $(CFLAGS) |
41 | ||
2a691470 | 42 | # The filename Kbuild has precedence over Makefile |
db8c1a7b | 43 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) |
0c53c8e6 SR |
44 | kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) |
45 | include $(kbuild-file) | |
46 | ||
47 | # If the save-* variables changed error out | |
48 | ifeq ($(KBUILD_NOPEDANTIC),) | |
49 | ifneq ("$(save-cflags)","$(CFLAGS)") | |
49c57d25 | 50 | $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y) |
0c53c8e6 SR |
51 | endif |
52 | endif | |
4a5838ad | 53 | |
1da177e4 LT |
54 | include scripts/Makefile.lib |
55 | ||
56 | ifdef host-progs | |
57 | ifneq ($(hostprogs-y),$(host-progs)) | |
58 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) | |
59 | hostprogs-y += $(host-progs) | |
60 | endif | |
61 | endif | |
62 | ||
3156fd05 | 63 | # Do not include host rules unless needed |
24403874 | 64 | ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),) |
1da177e4 LT |
65 | include scripts/Makefile.host |
66 | endif | |
67 | ||
1da177e4 LT |
68 | ifndef obj |
69 | $(warning kbuild: Makefile.build is included improperly) | |
70 | endif | |
71 | ||
72 | # =========================================================================== | |
73 | ||
a4954fd7 | 74 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) |
1da177e4 | 75 | lib-target := $(obj)/lib.a |
f98fe47c | 76 | real-obj-y += $(obj)/lib-ksyms.o |
1da177e4 LT |
77 | endif |
78 | ||
f98fe47c | 79 | ifneq ($(strip $(real-obj-y) $(need-builtin)),) |
f49821ee | 80 | builtin-target := $(obj)/built-in.a |
1da177e4 LT |
81 | endif |
82 | ||
551559e1 TH |
83 | modorder-target := $(obj)/modules.order |
84 | ||
1da177e4 LT |
85 | # We keep a list of all modules in $(MODVERDIR) |
86 | ||
87 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ | |
551559e1 | 88 | $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \ |
1da177e4 LT |
89 | $(subdir-ym) $(always) |
90 | @: | |
91 | ||
92 | # Linus' kernel sanity checking tool | |
93 | ifneq ($(KBUILD_CHECKSRC),0) | |
94 | ifeq ($(KBUILD_CHECKSRC),2) | |
95 | quiet_cmd_force_checksrc = CHECK $< | |
96 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
97 | else | |
98 | quiet_cmd_checksrc = CHECK $< | |
99 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
100 | endif | |
101 | endif | |
102 | ||
3a025e1d MW |
103 | ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),) |
104 | cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< ; | |
105 | endif | |
106 | ||
f49821ee | 107 | # Do section mismatch analysis for each module/built-in.a |
91341d4b SR |
108 | ifdef CONFIG_DEBUG_SECTION_MISMATCH |
109 | cmd_secanalysis = ; scripts/mod/modpost $@ | |
110 | endif | |
1da177e4 LT |
111 | |
112 | # Compile C sources (.c) | |
113 | # --------------------------------------------------------------------------- | |
114 | ||
115 | # Default is built-in, unless we know otherwise | |
6588169d SR |
116 | modkern_cflags = \ |
117 | $(if $(part-of-module), \ | |
118 | $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ | |
80c00ba9 | 119 | $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL)) |
1da177e4 LT |
120 | quiet_modtag := $(empty) $(empty) |
121 | ||
f5f33681 MY |
122 | $(real-obj-m) : part-of-module := y |
123 | $(real-obj-m:.o=.i) : part-of-module := y | |
124 | $(real-obj-m:.o=.s) : part-of-module := y | |
125 | $(real-obj-m:.o=.lst): part-of-module := y | |
1da177e4 | 126 | |
f5f33681 MY |
127 | $(real-obj-m) : quiet_modtag := [M] |
128 | $(real-obj-m:.o=.i) : quiet_modtag := [M] | |
129 | $(real-obj-m:.o=.s) : quiet_modtag := [M] | |
130 | $(real-obj-m:.o=.lst): quiet_modtag := [M] | |
1da177e4 | 131 | |
f5f33681 | 132 | $(obj-m) : quiet_modtag := [M] |
1da177e4 | 133 | |
1da177e4 | 134 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ |
1e64ff42 | 135 | cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $< |
1da177e4 | 136 | |
767e581d | 137 | $(obj)/%.s: $(src)/%.c FORCE |
1da177e4 LT |
138 | $(call if_changed_dep,cc_s_c) |
139 | ||
23d43848 MY |
140 | quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@ |
141 | cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $< | |
1da177e4 | 142 | |
767e581d | 143 | $(obj)/%.i: $(src)/%.c FORCE |
23d43848 | 144 | $(call if_changed_dep,cpp_i_c) |
1da177e4 | 145 | |
4efca4ed NP |
146 | # These mirror gensymtypes_S and co below, keep them in synch. |
147 | cmd_gensymtypes_c = \ | |
37a8d9f6 | 148 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ |
d70f82ac | 149 | $(GENKSYMS) $(if $(1), -T $(2)) \ |
56067812 | 150 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ |
37a8d9f6 | 151 | $(if $(KBUILD_PRESERVE),-p) \ |
e26d6b83 | 152 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) |
37a8d9f6 | 153 | |
15fde675 | 154 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ |
37a8d9f6 SR |
155 | cmd_cc_symtypes_c = \ |
156 | set -e; \ | |
4efca4ed | 157 | $(call cmd_gensymtypes_c,true,$@) >/dev/null; \ |
37a8d9f6 | 158 | test -s $@ || rm -f $@ |
15fde675 | 159 | |
767e581d | 160 | $(obj)/%.symtypes : $(src)/%.c FORCE |
64e6c1e1 | 161 | $(call cmd,cc_symtypes_c) |
15fde675 | 162 | |
433db3e2 VT |
163 | # LLVM assembly |
164 | # Generate .ll files from .c | |
165 | quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ | |
166 | cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $< | |
167 | ||
168 | $(obj)/%.ll: $(src)/%.c FORCE | |
169 | $(call if_changed_dep,cc_ll_c) | |
170 | ||
1da177e4 LT |
171 | # C (.c) files |
172 | # The C file is compiled and updated dependency information is generated. | |
173 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) | |
174 | ||
175 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ | |
176 | ||
177 | ifndef CONFIG_MODVERSIONS | |
178 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< | |
179 | ||
180 | else | |
181 | # When module versioning is enabled the following steps are executed: | |
2ea03891 SR |
182 | # o compile a .tmp_<file>.o from <file>.c |
183 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does | |
184 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and | |
1da177e4 LT |
185 | # are done. |
186 | # o otherwise, we calculate symbol versions using the good old | |
187 | # genksyms on the preprocessed source and postprocess them in a way | |
2ea03891 SR |
188 | # that they are usable as a linker script |
189 | # o generate <file>.o from .tmp_<file>.o using the linker to | |
190 | # replace the unresolved symbols __crc_exported_symbol with | |
191 | # the actual value of the checksum generated by genksyms | |
1da177e4 | 192 | |
2ea03891 | 193 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< |
4efca4ed NP |
194 | |
195 | cmd_modversions_c = \ | |
e26d6b83 | 196 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ |
4efca4ed | 197 | $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ |
e26d6b83 DZ |
198 | > $(@D)/.tmp_$(@F:.o=.ver); \ |
199 | \ | |
200 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ | |
201 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
202 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ | |
203 | else \ | |
204 | mv -f $(@D)/.tmp_$(@F) $@; \ | |
1da177e4 LT |
205 | fi; |
206 | endif | |
207 | ||
8da3821b | 208 | ifdef CONFIG_FTRACE_MCOUNT_RECORD |
96f60dfa AK |
209 | # gcc 5 supports generating the mcount tables directly |
210 | ifneq ($(call cc-option,-mrecord-mcount,y),y) | |
211 | KBUILD_CFLAGS += -mrecord-mcount | |
212 | else | |
213 | # else do it all manually | |
72441cb1 | 214 | ifdef BUILD_C_RECORDMCOUNT |
85356f80 SR |
215 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") |
216 | RECORDMCOUNT_FLAGS = -w | |
217 | endif | |
d7b4d6de SR |
218 | # Due to recursion, we must skip empty.o. |
219 | # The empty.o file is created in the make process in order to determine | |
312a3d09 C |
220 | # the target endianness and word size. It is made before all other C |
221 | # files, including recordmcount. | |
45677454 WZ |
222 | sub_cmd_record_mcount = \ |
223 | if [ $(@) != "scripts/mod/empty.o" ]; then \ | |
85356f80 | 224 | $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ |
45677454 | 225 | fi; |
d6971822 MM |
226 | recordmcount_source := $(srctree)/scripts/recordmcount.c \ |
227 | $(srctree)/scripts/recordmcount.h | |
72441cb1 | 228 | else |
45677454 | 229 | sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ |
e6299d26 | 230 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ |
b3acf29a | 231 | "$(if $(CONFIG_64BIT),64,32)" \ |
f9810a82 RV |
232 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \ |
233 | "$(LD)" "$(NM)" "$(RM)" "$(MV)" \ | |
18c167fd | 234 | "$(if $(part-of-module),1,0)" "$(@)"; |
d6971822 | 235 | recordmcount_source := $(srctree)/scripts/recordmcount.pl |
312a3d09 | 236 | endif # BUILD_C_RECORDMCOUNT |
c0a80c0c HC |
237 | cmd_record_mcount = \ |
238 | if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \ | |
239 | "$(CC_FLAGS_FTRACE)" ]; then \ | |
45677454 WZ |
240 | $(sub_cmd_record_mcount) \ |
241 | fi; | |
ed7d40bc | 242 | endif # -record-mcount |
312a3d09 | 243 | endif # CONFIG_FTRACE_MCOUNT_RECORD |
8da3821b | 244 | |
b9ab5ebb | 245 | ifdef CONFIG_STACK_VALIDATION |
3b27a0c8 | 246 | ifneq ($(SKIP_STACK_VALIDATION),1) |
b9ab5ebb JP |
247 | |
248 | __objtool_obj := $(objtree)/tools/objtool/objtool | |
249 | ||
11af8474 | 250 | objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check) |
ee9f8fce | 251 | |
ca41b97e PZ |
252 | objtool_args += $(if $(part-of-module), --module,) |
253 | ||
b9ab5ebb JP |
254 | ifndef CONFIG_FRAME_POINTER |
255 | objtool_args += --no-fp | |
256 | endif | |
867ac9d7 JP |
257 | ifdef CONFIG_GCOV_KERNEL |
258 | objtool_args += --no-unreachable | |
da541b20 JP |
259 | else |
260 | objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable) | |
867ac9d7 | 261 | endif |
b5bc2231 | 262 | ifdef CONFIG_RETPOLINE |
d5028ba8 | 263 | ifneq ($(RETPOLINE_CFLAGS),) |
b5bc2231 PZ |
264 | objtool_args += --retpoline |
265 | endif | |
d5028ba8 | 266 | endif |
b5bc2231 | 267 | |
b9ab5ebb | 268 | |
2a0098d7 JP |
269 | ifdef CONFIG_MODVERSIONS |
270 | objtool_o = $(@D)/.tmp_$(@F) | |
271 | else | |
272 | objtool_o = $(@) | |
273 | endif | |
274 | ||
b9ab5ebb JP |
275 | # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory |
276 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file | |
277 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file | |
278 | cmd_objtool = $(if $(patsubst y%,, \ | |
279 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ | |
2a0098d7 | 280 | $(__objtool_obj) $(objtool_args) "$(objtool_o)";) |
b9ab5ebb JP |
281 | objtool_obj = $(if $(patsubst y%,, \ |
282 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ | |
283 | $(__objtool_obj)) | |
284 | ||
3b27a0c8 | 285 | endif # SKIP_STACK_VALIDATION |
b9ab5ebb JP |
286 | endif # CONFIG_STACK_VALIDATION |
287 | ||
ee9f8fce JP |
288 | # Rebuild all objects when objtool changes, or is enabled/disabled. |
289 | objtool_dep = $(objtool_obj) \ | |
290 | $(wildcard include/config/orc/unwinder.h \ | |
291 | include/config/stack/validation.h) | |
292 | ||
1da177e4 | 293 | define rule_cc_o_c |
6176aa9a | 294 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
e4aca459 | 295 | $(call cmd_and_fixdep,cc_o_c) \ |
3a025e1d | 296 | $(cmd_checkdoc) \ |
e8a3118e | 297 | $(call echo-cmd,objtool) $(cmd_objtool) \ |
2a0098d7 | 298 | $(cmd_modversions_c) \ |
e4aca459 | 299 | $(call echo-cmd,record_mcount) $(cmd_record_mcount) |
1da177e4 LT |
300 | endef |
301 | ||
b9ab5ebb | 302 | define rule_as_o_S |
e4aca459 | 303 | $(call cmd_and_fixdep,as_o_S) \ |
2a0098d7 JP |
304 | $(call echo-cmd,objtool) $(cmd_objtool) \ |
305 | $(cmd_modversions_S) | |
b9ab5ebb JP |
306 | endef |
307 | ||
9895c03d NP |
308 | # List module undefined symbols (or empty line if not enabled) |
309 | ifdef CONFIG_TRIM_UNUSED_KSYMS | |
1fe7d2bb | 310 | cmd_undef_syms = $(NM) $@ | sed -n 's/^ *U //p' | xargs echo |
9895c03d NP |
311 | else |
312 | cmd_undef_syms = echo | |
313 | endif | |
314 | ||
1da177e4 | 315 | # Built-in and composite module parts |
ee9f8fce | 316 | $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE |
1da177e4 LT |
317 | $(call cmd,force_checksrc) |
318 | $(call if_changed_rule,cc_o_c) | |
319 | ||
320 | # Single-part modules are special since we need to mark them in $(MODVERDIR) | |
321 | ||
ee9f8fce | 322 | $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE |
1da177e4 LT |
323 | $(call cmd,force_checksrc) |
324 | $(call if_changed_rule,cc_o_c) | |
9895c03d NP |
325 | @{ echo $(@:.o=.ko); echo $@; \ |
326 | $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) | |
1da177e4 LT |
327 | |
328 | quiet_cmd_cc_lst_c = MKLST $@ | |
329 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ | |
330 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ | |
331 | System.map $(OBJDUMP) > $@ | |
332 | ||
767e581d | 333 | $(obj)/%.lst: $(src)/%.c FORCE |
1da177e4 LT |
334 | $(call if_changed_dep,cc_lst_c) |
335 | ||
336 | # Compile assembler sources (.S) | |
337 | # --------------------------------------------------------------------------- | |
338 | ||
80c00ba9 | 339 | modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) |
1da177e4 | 340 | |
f5f33681 MY |
341 | $(real-obj-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) |
342 | $(real-obj-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) | |
1da177e4 | 343 | |
4efca4ed NP |
344 | # .S file exports must have their C prototypes defined in asm/asm-prototypes.h |
345 | # or a file that it includes, in order to get versioned symbols. We build a | |
346 | # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from | |
347 | # the .S file (with trailing ';'), and run genksyms on that, to extract vers. | |
348 | # | |
349 | # This is convoluted. The .S file must first be preprocessed to run guards and | |
350 | # expand names, then the resulting exports must be constructed into plain | |
351 | # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed | |
352 | # to make the genksyms input. | |
353 | # | |
354 | # These mirror gensymtypes_c and co above, keep them in synch. | |
355 | cmd_gensymtypes_S = \ | |
356 | (echo "\#include <linux/kernel.h>" ; \ | |
357 | echo "\#include <asm/asm-prototypes.h>" ; \ | |
358 | $(CPP) $(a_flags) $< | \ | |
cc6acc11 NP |
359 | grep "\<___EXPORT_SYMBOL\>" | \ |
360 | sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \ | |
4efca4ed NP |
361 | $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \ |
362 | $(GENKSYMS) $(if $(1), -T $(2)) \ | |
56067812 | 363 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ |
4efca4ed NP |
364 | $(if $(KBUILD_PRESERVE),-p) \ |
365 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) | |
366 | ||
367 | quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@ | |
368 | cmd_cc_symtypes_S = \ | |
369 | set -e; \ | |
370 | $(call cmd_gensymtypes_S,true,$@) >/dev/null; \ | |
371 | test -s $@ || rm -f $@ | |
372 | ||
373 | $(obj)/%.symtypes : $(src)/%.S FORCE | |
374 | $(call cmd,cc_symtypes_S) | |
375 | ||
376 | ||
e0f41e52 MY |
377 | quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@ |
378 | cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< | |
1da177e4 | 379 | |
767e581d | 380 | $(obj)/%.s: $(src)/%.S FORCE |
e0f41e52 | 381 | $(call if_changed_dep,cpp_s_S) |
1da177e4 LT |
382 | |
383 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ | |
4efca4ed NP |
384 | |
385 | ifndef CONFIG_MODVERSIONS | |
386 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< | |
387 | ||
388 | else | |
389 | ||
390 | ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h) | |
391 | ||
392 | ifeq ($(ASM_PROTOTYPES),) | |
393 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< | |
394 | ||
395 | else | |
396 | ||
397 | # versioning matches the C process described above, with difference that | |
398 | # we parse asm-prototypes.h C header to get function definitions. | |
399 | ||
400 | cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $< | |
401 | ||
402 | cmd_modversions_S = \ | |
403 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ | |
404 | $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ | |
405 | > $(@D)/.tmp_$(@F:.o=.ver); \ | |
406 | \ | |
407 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ | |
408 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
409 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ | |
410 | else \ | |
411 | mv -f $(@D)/.tmp_$(@F) $@; \ | |
412 | fi; | |
413 | endif | |
414 | endif | |
1da177e4 | 415 | |
ee9f8fce | 416 | $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE |
b9ab5ebb | 417 | $(call if_changed_rule,as_o_S) |
1da177e4 | 418 | |
f98fe47c | 419 | targets += $(filter-out $(subdir-obj-y), $(real-obj-y)) $(real-obj-m) $(lib-y) |
1da177e4 LT |
420 | targets += $(extra-y) $(MAKECMDGOALS) $(always) |
421 | ||
422 | # Linker scripts preprocessor (.lds.S -> .lds) | |
423 | # --------------------------------------------------------------------------- | |
424 | quiet_cmd_cpp_lds_S = LDS $@ | |
5cb0512c | 425 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ |
42f29a25 | 426 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< |
1da177e4 | 427 | |
767e581d | 428 | $(obj)/%.lds: $(src)/%.lds.S FORCE |
1da177e4 LT |
429 | $(call if_changed_dep,cpp_lds_S) |
430 | ||
4520c6a4 DH |
431 | # ASN.1 grammar |
432 | # --------------------------------------------------------------------------- | |
433 | quiet_cmd_asn1_compiler = ASN.1 $@ | |
434 | cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ | |
435 | $(subst .h,.c,$@) $(subst .c,.h,$@) | |
436 | ||
4fa8bc94 | 437 | $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler |
4520c6a4 DH |
438 | $(call cmd,asn1_compiler) |
439 | ||
1da177e4 LT |
440 | # Build the compiled-in targets |
441 | # --------------------------------------------------------------------------- | |
442 | ||
443 | # To build objects in subdirs, we need to descend into the directories | |
444 | $(sort $(subdir-obj-y)): $(subdir-ym) ; | |
445 | ||
446 | # | |
447 | # Rule to compile a set of .o files into one .o file | |
448 | # | |
449 | ifdef builtin-target | |
a5967db9 | 450 | |
f49821ee | 451 | # built-in.a archives are made with no symbol table or index which |
6358d6e8 | 452 | # makes them small and fast, but unable to be used by the linker. |
f49821ee | 453 | # scripts/link-vmlinux.sh builds an aggregate built-in.a with a symbol |
6358d6e8 | 454 | # table and index. |
5e18f029 MY |
455 | quiet_cmd_ar_builtin = AR $@ |
456 | cmd_ar_builtin = rm -f $@; \ | |
457 | $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(filter $(real-obj-y), $^) | |
1da177e4 | 458 | |
f98fe47c | 459 | $(builtin-target): $(real-obj-y) FORCE |
5e18f029 | 460 | $(call if_changed,ar_builtin) |
1da177e4 LT |
461 | |
462 | targets += $(builtin-target) | |
463 | endif # builtin-target | |
464 | ||
551559e1 TH |
465 | # |
466 | # Rule to create modules.order file | |
467 | # | |
468 | # Create commands to either record .ko file or cat modules.order from | |
469 | # a subdirectory | |
470 | modorder-cmds = \ | |
471 | $(foreach m, $(modorder), \ | |
472 | $(if $(filter %/modules.order, $m), \ | |
473 | cat $m;, echo kernel/$m;)) | |
474 | ||
475 | $(modorder-target): $(subdir-ym) FORCE | |
476 | $(Q)(cat /dev/null; $(modorder-cmds)) > $@ | |
477 | ||
1da177e4 LT |
478 | # |
479 | # Rule to compile a set of .o files into one .a file | |
480 | # | |
481 | ifdef lib-target | |
482 | quiet_cmd_link_l_target = AR $@ | |
a5967db9 | 483 | |
6358d6e8 NP |
484 | # lib target archives do get a symbol table and index |
485 | cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y) | |
1da177e4 LT |
486 | |
487 | $(lib-target): $(lib-y) FORCE | |
488 | $(call if_changed,link_l_target) | |
489 | ||
490 | targets += $(lib-target) | |
7f2084fa AV |
491 | |
492 | dummy-object = $(obj)/.lib_exports.o | |
493 | ksyms-lds = $(dot-target).lds | |
7f2084fa AV |
494 | |
495 | quiet_cmd_export_list = EXPORTS $@ | |
496 | cmd_export_list = $(OBJDUMP) -h $< | \ | |
704db543 | 497 | sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/EXTERN(\1)/p' >$(ksyms-lds);\ |
7f2084fa | 498 | rm -f $(dummy-object);\ |
9da2f584 | 499 | echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\ |
7f2084fa AV |
500 | $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\ |
501 | rm $(dummy-object) $(ksyms-lds) | |
502 | ||
503 | $(obj)/lib-ksyms.o: $(lib-target) FORCE | |
504 | $(call if_changed,export_list) | |
989cea5c NP |
505 | |
506 | targets += $(obj)/lib-ksyms.o | |
507 | ||
1da177e4 LT |
508 | endif |
509 | ||
510 | # | |
511 | # Rule to link composite objects | |
512 | # | |
513 | # Composite objects are specified in kbuild makefile as follows: | |
514 | # <composite-object>-objs := <list of .o files> | |
515 | # or | |
516 | # <composite-object>-y := <list of .o files> | |
cf4f2193 MM |
517 | # or |
518 | # <composite-object>-m := <list of .o files> | |
519 | # The -m syntax only works if <composite object> is a module | |
1da177e4 LT |
520 | link_multi_deps = \ |
521 | $(filter $(addprefix $(obj)/, \ | |
522 | $($(subst $(obj)/,,$(@:.o=-objs))) \ | |
cf4f2193 MM |
523 | $($(subst $(obj)/,,$(@:.o=-y))) \ |
524 | $($(subst $(obj)/,,$(@:.o=-m)))), $^) | |
38385f8f | 525 | |
1da177e4 | 526 | quiet_cmd_link_multi-m = LD [M] $@ |
127668cf | 527 | cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis) |
1da177e4 | 528 | |
c8589d1e | 529 | $(multi-used-m): FORCE |
1da177e4 | 530 | $(call if_changed,link_multi-m) |
9895c03d NP |
531 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); \ |
532 | $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) | |
cf4f2193 | 533 | $(call multi_depend, $(multi-used-m), .o, -objs -y -m) |
1da177e4 | 534 | |
f98fe47c | 535 | targets += $(multi-used-m) |
591f6689 | 536 | targets := $(filter-out $(PHONY), $(targets)) |
1da177e4 | 537 | |
b23d1a24 MY |
538 | # Add intermediate targets: |
539 | # When building objects with specific suffix patterns, add intermediate | |
540 | # targets that the final targets are derived from. | |
541 | intermediate_targets = $(foreach sfx, $(2), \ | |
542 | $(patsubst %$(strip $(1)),%$(sfx), \ | |
543 | $(filter %$(strip $(1)), $(targets)))) | |
54a702f7 | 544 | # %.asn1.o <- %.asn1.[ch] <- %.asn1 |
a7f92419 | 545 | # %.dtb.o <- %.dtb.S <- %.dtb <- %.dts |
b23d1a24 MY |
546 | # %.lex.o <- %.lex.c <- %.l |
547 | # %.tab.o <- %.tab.[ch] <- %.y | |
54a702f7 MY |
548 | targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \ |
549 | $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \ | |
a7f92419 | 550 | $(call intermediate_targets, .lex.o, .lex.c) \ |
b23d1a24 MY |
551 | $(call intermediate_targets, .tab.o, .tab.c .tab.h) |
552 | ||
1da177e4 LT |
553 | # Descending |
554 | # --------------------------------------------------------------------------- | |
555 | ||
4f193362 | 556 | PHONY += $(subdir-ym) |
1da177e4 | 557 | $(subdir-ym): |
f7adc312 | 558 | $(Q)$(MAKE) $(build)=$@ need-builtin=$(if $(findstring $@,$(subdir-obj-y)),1) |
1da177e4 LT |
559 | |
560 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
561 | # --------------------------------------------------------------------------- | |
562 | ||
4f193362 | 563 | PHONY += FORCE |
1da177e4 LT |
564 | |
565 | FORCE: | |
566 | ||
567 | # Read all saved command lines and dependencies for the $(targets) we | |
568 | # may be building above, using $(if_changed{,_dep}). As an | |
569 | # optimization, we don't need to read them if the target does not | |
570 | # exist, we will rebuild anyway in that case. | |
571 | ||
2982c953 | 572 | cmd_files := $(wildcard $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) |
1da177e4 LT |
573 | |
574 | ifneq ($(cmd_files),) | |
575 | include $(cmd_files) | |
576 | endif | |
4f193362 | 577 | |
8a78756e MY |
578 | ifneq ($(KBUILD_SRC),) |
579 | # Create directories for object files if they do not exist | |
580 | obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets)))) | |
c4da7ed0 MY |
581 | # If cmd_files exist, their directories apparently exist. Skip mkdir. |
582 | exist-dirs := $(sort $(patsubst %/,%, $(dir $(cmd_files)))) | |
583 | obj-dirs := $(strip $(filter-out $(exist-dirs), $(obj-dirs))) | |
584 | ifneq ($(obj-dirs),) | |
8a78756e MY |
585 | $(shell mkdir -p $(obj-dirs)) |
586 | endif | |
c4da7ed0 | 587 | endif |
8a78756e | 588 | |
54a702f7 MY |
589 | # Some files contained in $(targets) are intermediate artifacts. |
590 | # We never want them to be removed automatically. | |
591 | .SECONDARY: $(targets) | |
592 | ||
4f193362 PS |
593 | # Declare the contents of the .PHONY variable as phony. We keep that |
594 | # information in a variable se we can use it in if_changed and friends. | |
595 | ||
596 | .PHONY: $(PHONY) |