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1 | # ========================================================================== |
2 | # Building |
3 | # ========================================================================== |
4 | |
5 | src := $(obj) |
6 | |
7 | PHONY := __build |
8 | __build: |
9 | |
10 | # Init all relevant variables used in kbuild files so |
11 | # 1) they have correct type |
12 | # 2) they do not inherit any value from the environment |
13 | obj-y := |
14 | obj-m := |
15 | lib-y := |
16 | lib-m := |
17 | always := |
18 | targets := |
19 | subdir-y := |
20 | subdir-m := |
21 | EXTRA_AFLAGS := |
22 | EXTRA_CFLAGS := |
23 | EXTRA_CPPFLAGS := |
24 | EXTRA_LDFLAGS := |
25 | asflags-y := |
26 | ccflags-y := |
27 | cppflags-y := |
28 | ldflags-y := |
29 | |
30 | subdir-asflags-y := |
31 | subdir-ccflags-y := |
32 | |
33 | # Read auto.conf if it exists, otherwise ignore |
34 | -include include/config/auto.conf |
35 | |
36 | include scripts/Kbuild.include |
37 | |
38 | # For backward compatibility check that these variables do not change |
39 | save-cflags := $(CFLAGS) |
40 | |
41 | # The filename Kbuild has precedence over Makefile |
42 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) |
43 | kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) |
44 | include $(kbuild-file) |
45 | |
46 | # If the save-* variables changed error out |
47 | ifeq ($(KBUILD_NOPEDANTIC),) |
48 | ifneq ("$(save-cflags)","$(CFLAGS)") |
49 | $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y) |
50 | endif |
51 | endif |
52 | |
53 | # |
54 | # make W=... settings |
55 | # |
56 | # W=1 - warnings that may be relevant and does not occur too often |
57 | # W=2 - warnings that occur quite often but may still be relevant |
58 | # W=3 - the more obscure warnings, can most likely be ignored |
59 | # |
60 | # $(call cc-option, -W...) handles gcc -W.. options which |
61 | # are not supported by all versions of the compiler |
62 | ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS |
63 | warning- := $(empty) |
64 | |
65 | warning-1 := -Wextra -Wunused -Wno-unused-parameter |
66 | warning-1 += -Wmissing-declarations |
67 | warning-1 += -Wmissing-format-attribute |
68 | warning-1 += -Wmissing-prototypes |
69 | warning-1 += -Wold-style-definition |
70 | warning-1 += $(call cc-option, -Wmissing-include-dirs) |
71 | warning-1 += $(call cc-option, -Wunused-but-set-variable) |
72 | warning-1 += $(call cc-disable-warning, missing-field-initializers) |
73 | |
74 | warning-2 := -Waggregate-return |
75 | warning-2 += -Wcast-align |
76 | warning-2 += -Wdisabled-optimization |
77 | warning-2 += -Wnested-externs |
78 | warning-2 += -Wshadow |
79 | warning-2 += $(call cc-option, -Wlogical-op) |
80 | warning-2 += $(call cc-option, -Wmissing-field-initializers) |
81 | |
82 | warning-3 := -Wbad-function-cast |
83 | warning-3 += -Wcast-qual |
84 | warning-3 += -Wconversion |
85 | warning-3 += -Wpacked |
86 | warning-3 += -Wpadded |
87 | warning-3 += -Wpointer-arith |
88 | warning-3 += -Wredundant-decls |
89 | warning-3 += -Wswitch-default |
90 | warning-3 += $(call cc-option, -Wpacked-bitfield-compat) |
91 | warning-3 += $(call cc-option, -Wvla) |
92 | |
93 | warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) |
94 | warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) |
95 | warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) |
96 | |
97 | ifeq ("$(strip $(warning))","") |
98 | $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown) |
99 | endif |
100 | |
101 | KBUILD_CFLAGS += $(warning) |
102 | endif |
103 | |
104 | include scripts/Makefile.lib |
105 | |
106 | ifdef host-progs |
107 | ifneq ($(hostprogs-y),$(host-progs)) |
108 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) |
109 | hostprogs-y += $(host-progs) |
110 | endif |
111 | endif |
112 | |
113 | # Do not include host rules unless needed |
114 | ifneq ($(hostprogs-y)$(hostprogs-m),) |
115 | include scripts/Makefile.host |
116 | endif |
117 | |
118 | ifneq ($(KBUILD_SRC),) |
119 | # Create output directory if not already present |
120 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) |
121 | |
122 | # Create directories for object files if directory does not exist |
123 | # Needed when obj-y := dir/file.o syntax is used |
124 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) |
125 | endif |
126 | |
127 | ifndef obj |
128 | $(warning kbuild: Makefile.build is included improperly) |
129 | endif |
130 | |
131 | # =========================================================================== |
132 | |
133 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),) |
134 | lib-target := $(obj)/lib.a |
135 | endif |
136 | |
137 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(subdir-m) $(lib-target)),) |
138 | builtin-target := $(obj)/built-in.o |
139 | endif |
140 | |
141 | modorder-target := $(obj)/modules.order |
142 | |
143 | # We keep a list of all modules in $(MODVERDIR) |
144 | |
145 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ |
146 | $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \ |
147 | $(subdir-ym) $(always) |
148 | @: |
149 | |
150 | # Linus' kernel sanity checking tool |
151 | ifneq ($(KBUILD_CHECKSRC),0) |
152 | ifeq ($(KBUILD_CHECKSRC),2) |
153 | quiet_cmd_force_checksrc = CHECK $< |
154 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; |
155 | else |
156 | quiet_cmd_checksrc = CHECK $< |
157 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; |
158 | endif |
159 | endif |
160 | |
161 | # Do section mismatch analysis for each module/built-in.o |
162 | ifdef CONFIG_DEBUG_SECTION_MISMATCH |
163 | cmd_secanalysis = ; scripts/mod/modpost $@ |
164 | endif |
165 | |
166 | # Compile C sources (.c) |
167 | # --------------------------------------------------------------------------- |
168 | |
169 | # Default is built-in, unless we know otherwise |
170 | modkern_cflags = \ |
171 | $(if $(part-of-module), \ |
172 | $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ |
173 | $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL)) |
174 | quiet_modtag := $(empty) $(empty) |
175 | |
176 | $(real-objs-m) : part-of-module := y |
177 | $(real-objs-m:.o=.i) : part-of-module := y |
178 | $(real-objs-m:.o=.s) : part-of-module := y |
179 | $(real-objs-m:.o=.lst): part-of-module := y |
180 | |
181 | $(real-objs-m) : quiet_modtag := [M] |
182 | $(real-objs-m:.o=.i) : quiet_modtag := [M] |
183 | $(real-objs-m:.o=.s) : quiet_modtag := [M] |
184 | $(real-objs-m:.o=.lst): quiet_modtag := [M] |
185 | |
186 | $(obj-m) : quiet_modtag := [M] |
187 | |
188 | # Default for not multi-part modules |
189 | modname = $(basetarget) |
190 | |
191 | $(multi-objs-m) : modname = $(modname-multi) |
192 | $(multi-objs-m:.o=.i) : modname = $(modname-multi) |
193 | $(multi-objs-m:.o=.s) : modname = $(modname-multi) |
194 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi) |
195 | $(multi-objs-y) : modname = $(modname-multi) |
196 | $(multi-objs-y:.o=.i) : modname = $(modname-multi) |
197 | $(multi-objs-y:.o=.s) : modname = $(modname-multi) |
198 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi) |
199 | |
200 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ |
201 | cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $< |
202 | |
203 | $(obj)/%.s: $(src)/%.c FORCE |
204 | $(call if_changed_dep,cc_s_c) |
205 | |
206 | quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@ |
207 | cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $< |
208 | |
209 | $(obj)/%.i: $(src)/%.c FORCE |
210 | $(call if_changed_dep,cc_i_c) |
211 | |
212 | cmd_gensymtypes = \ |
213 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ |
214 | $(GENKSYMS) $(if $(1), -T $(2)) -a $(ARCH) \ |
215 | $(if $(KBUILD_PRESERVE),-p) \ |
216 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) |
217 | |
218 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ |
219 | cmd_cc_symtypes_c = \ |
220 | set -e; \ |
221 | $(call cmd_gensymtypes,true,$@) >/dev/null; \ |
222 | test -s $@ || rm -f $@ |
223 | |
224 | $(obj)/%.symtypes : $(src)/%.c FORCE |
225 | $(call cmd,cc_symtypes_c) |
226 | |
227 | # C (.c) files |
228 | # The C file is compiled and updated dependency information is generated. |
229 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) |
230 | |
231 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ |
232 | |
233 | ifndef CONFIG_MODVERSIONS |
234 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< |
235 | |
236 | else |
237 | # When module versioning is enabled the following steps are executed: |
238 | # o compile a .tmp_<file>.o from <file>.c |
239 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does |
240 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and |
241 | # are done. |
242 | # o otherwise, we calculate symbol versions using the good old |
243 | # genksyms on the preprocessed source and postprocess them in a way |
244 | # that they are usable as a linker script |
245 | # o generate <file>.o from .tmp_<file>.o using the linker to |
246 | # replace the unresolved symbols __crc_exported_symbol with |
247 | # the actual value of the checksum generated by genksyms |
248 | |
249 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< |
250 | cmd_modversions = \ |
251 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ |
252 | $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ |
253 | > $(@D)/.tmp_$(@F:.o=.ver); \ |
254 | \ |
255 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ |
256 | -T $(@D)/.tmp_$(@F:.o=.ver); \ |
257 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ |
258 | else \ |
259 | mv -f $(@D)/.tmp_$(@F) $@; \ |
260 | fi; |
261 | endif |
262 | |
263 | ifdef CONFIG_FTRACE_MCOUNT_RECORD |
264 | ifdef BUILD_C_RECORDMCOUNT |
265 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") |
266 | RECORDMCOUNT_FLAGS = -w |
267 | endif |
268 | # Due to recursion, we must skip empty.o. |
269 | # The empty.o file is created in the make process in order to determine |
270 | # the target endianness and word size. It is made before all other C |
271 | # files, including recordmcount. |
272 | sub_cmd_record_mcount = \ |
273 | if [ $(@) != "scripts/mod/empty.o" ]; then \ |
274 | $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ |
275 | fi; |
276 | recordmcount_source := $(srctree)/scripts/recordmcount.c \ |
277 | $(srctree)/scripts/recordmcount.h |
278 | else |
279 | sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ |
280 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ |
281 | "$(if $(CONFIG_64BIT),64,32)" \ |
282 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \ |
283 | "$(LD)" "$(NM)" "$(RM)" "$(MV)" \ |
284 | "$(if $(part-of-module),1,0)" "$(@)"; |
285 | recordmcount_source := $(srctree)/scripts/recordmcount.pl |
286 | endif |
287 | cmd_record_mcount = \ |
288 | if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then \ |
289 | $(sub_cmd_record_mcount) \ |
290 | fi; |
291 | endif |
292 | |
293 | define rule_cc_o_c |
294 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
295 | $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \ |
296 | $(cmd_modversions) \ |
297 | $(call echo-cmd,record_mcount) \ |
298 | $(cmd_record_mcount) \ |
299 | scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \ |
300 | $(dot-target).tmp; \ |
301 | rm -f $(depfile); \ |
302 | mv -f $(dot-target).tmp $(dot-target).cmd |
303 | endef |
304 | |
305 | # Built-in and composite module parts |
306 | $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE |
307 | $(call cmd,force_checksrc) |
308 | $(call if_changed_rule,cc_o_c) |
309 | |
310 | # Single-part modules are special since we need to mark them in $(MODVERDIR) |
311 | |
312 | $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE |
313 | $(call cmd,force_checksrc) |
314 | $(call if_changed_rule,cc_o_c) |
315 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod) |
316 | |
317 | quiet_cmd_cc_lst_c = MKLST $@ |
318 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ |
319 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ |
320 | System.map $(OBJDUMP) > $@ |
321 | |
322 | $(obj)/%.lst: $(src)/%.c FORCE |
323 | $(call if_changed_dep,cc_lst_c) |
324 | |
325 | # Compile assembler sources (.S) |
326 | # --------------------------------------------------------------------------- |
327 | |
328 | modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) |
329 | |
330 | $(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) |
331 | $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) |
332 | |
333 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@ |
334 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $< |
335 | |
336 | $(obj)/%.s: $(src)/%.S FORCE |
337 | $(call if_changed_dep,as_s_S) |
338 | |
339 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ |
340 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< |
341 | |
342 | $(obj)/%.o: $(src)/%.S FORCE |
343 | $(call if_changed_dep,as_o_S) |
344 | |
345 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) |
346 | targets += $(extra-y) $(MAKECMDGOALS) $(always) |
347 | |
348 | # Linker scripts preprocessor (.lds.S -> .lds) |
349 | # --------------------------------------------------------------------------- |
350 | quiet_cmd_cpp_lds_S = LDS $@ |
351 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \ |
352 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< |
353 | |
354 | $(obj)/%.lds: $(src)/%.lds.S FORCE |
355 | $(call if_changed_dep,cpp_lds_S) |
356 | |
357 | # Build the compiled-in targets |
358 | # --------------------------------------------------------------------------- |
359 | |
360 | # To build objects in subdirs, we need to descend into the directories |
361 | $(sort $(subdir-obj-y)): $(subdir-ym) ; |
362 | |
363 | # |
364 | # Rule to compile a set of .o files into one .o file |
365 | # |
366 | ifdef builtin-target |
367 | quiet_cmd_link_o_target = LD $@ |
368 | # If the list of objects to link is empty, just create an empty built-in.o |
369 | cmd_link_o_target = $(if $(strip $(obj-y)),\ |
370 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \ |
371 | $(cmd_secanalysis),\ |
372 | rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@) |
373 | |
374 | $(builtin-target): $(obj-y) FORCE |
375 | $(call if_changed,link_o_target) |
376 | |
377 | targets += $(builtin-target) |
378 | endif # builtin-target |
379 | |
380 | # |
381 | # Rule to create modules.order file |
382 | # |
383 | # Create commands to either record .ko file or cat modules.order from |
384 | # a subdirectory |
385 | modorder-cmds = \ |
386 | $(foreach m, $(modorder), \ |
387 | $(if $(filter %/modules.order, $m), \ |
388 | cat $m;, echo kernel/$m;)) |
389 | |
390 | $(modorder-target): $(subdir-ym) FORCE |
391 | $(Q)(cat /dev/null; $(modorder-cmds)) > $@ |
392 | |
393 | # |
394 | # Rule to compile a set of .o files into one .a file |
395 | # |
396 | ifdef lib-target |
397 | quiet_cmd_link_l_target = AR $@ |
398 | cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y) |
399 | |
400 | $(lib-target): $(lib-y) FORCE |
401 | $(call if_changed,link_l_target) |
402 | |
403 | targets += $(lib-target) |
404 | endif |
405 | |
406 | # |
407 | # Rule to link composite objects |
408 | # |
409 | # Composite objects are specified in kbuild makefile as follows: |
410 | # <composite-object>-objs := <list of .o files> |
411 | # or |
412 | # <composite-object>-y := <list of .o files> |
413 | link_multi_deps = \ |
414 | $(filter $(addprefix $(obj)/, \ |
415 | $($(subst $(obj)/,,$(@:.o=-objs))) \ |
416 | $($(subst $(obj)/,,$(@:.o=-y)))), $^) |
417 | |
418 | quiet_cmd_link_multi-y = LD $@ |
419 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis) |
420 | |
421 | quiet_cmd_link_multi-m = LD [M] $@ |
422 | cmd_link_multi-m = $(cmd_link_multi-y) |
423 | |
424 | # We would rather have a list of rules like |
425 | # foo.o: $(foo-objs) |
426 | # but that's not so easy, so we rather make all composite objects depend |
427 | # on the set of all their parts |
428 | $(multi-used-y) : %.o: $(multi-objs-y) FORCE |
429 | $(call if_changed,link_multi-y) |
430 | |
431 | $(multi-used-m) : %.o: $(multi-objs-m) FORCE |
432 | $(call if_changed,link_multi-m) |
433 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) |
434 | |
435 | targets += $(multi-used-y) $(multi-used-m) |
436 | |
437 | |
438 | # Descending |
439 | # --------------------------------------------------------------------------- |
440 | |
441 | PHONY += $(subdir-ym) |
442 | $(subdir-ym): |
443 | $(Q)$(MAKE) $(build)=$@ |
444 | |
445 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. |
446 | # --------------------------------------------------------------------------- |
447 | |
448 | PHONY += FORCE |
449 | |
450 | FORCE: |
451 | |
452 | # Read all saved command lines and dependencies for the $(targets) we |
453 | # may be building above, using $(if_changed{,_dep}). As an |
454 | # optimization, we don't need to read them if the target does not |
455 | # exist, we will rebuild anyway in that case. |
456 | |
457 | targets := $(wildcard $(sort $(targets))) |
458 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) |
459 | |
460 | ifneq ($(cmd_files),) |
461 | include $(cmd_files) |
462 | endif |
463 | |
464 | # Declare the contents of the .PHONY variable as phony. We keep that |
465 | # information in a variable se we can use it in if_changed and friends. |
466 | |
467 | .PHONY: $(PHONY) |
468 |
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Tags:
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