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Commit | Line | Data |
---|---|---|
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 | include scripts/Makefile.lib | |
54 | ||
55 | ifdef host-progs | |
56 | ifneq ($(hostprogs-y),$(host-progs)) | |
57 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) | |
58 | hostprogs-y += $(host-progs) | |
59 | endif | |
60 | endif | |
61 | ||
62 | # Do not include host rules unless needed | |
63 | ifneq ($(hostprogs-y)$(hostprogs-m),) | |
64 | include scripts/Makefile.host | |
65 | endif | |
66 | ||
67 | ifneq ($(KBUILD_SRC),) | |
68 | # Create output directory if not already present | |
69 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) | |
70 | ||
71 | # Create directories for object files if directory does not exist | |
72 | # Needed when obj-y := dir/file.o syntax is used | |
73 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) | |
74 | endif | |
75 | ||
76 | ifndef obj | |
77 | $(warning kbuild: Makefile.build is included improperly) | |
78 | endif | |
79 | ||
80 | # =========================================================================== | |
81 | ||
82 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) | |
83 | lib-target := $(obj)/lib.a | |
84 | endif | |
85 | ||
86 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),) | |
87 | builtin-target := $(obj)/built-in.o | |
88 | endif | |
89 | ||
90 | modorder-target := $(obj)/modules.order | |
91 | ||
92 | # We keep a list of all modules in $(MODVERDIR) | |
93 | ||
94 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ | |
95 | $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \ | |
96 | $(subdir-ym) $(always) | |
97 | @: | |
98 | ||
99 | # Linus' kernel sanity checking tool | |
100 | ifneq ($(KBUILD_CHECKSRC),0) | |
101 | ifeq ($(KBUILD_CHECKSRC),2) | |
102 | quiet_cmd_force_checksrc = CHECK $< | |
103 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
104 | else | |
105 | quiet_cmd_checksrc = CHECK $< | |
106 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
107 | endif | |
108 | endif | |
109 | ||
110 | # Do section mismatch analysis for each module/built-in.o | |
111 | ifdef CONFIG_DEBUG_SECTION_MISMATCH | |
112 | cmd_secanalysis = ; scripts/mod/modpost $@ | |
113 | endif | |
114 | ||
115 | # Compile C sources (.c) | |
116 | # --------------------------------------------------------------------------- | |
117 | ||
118 | # Default is built-in, unless we know otherwise | |
119 | modkern_cflags = \ | |
120 | $(if $(part-of-module), \ | |
121 | $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ | |
122 | $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL)) | |
123 | quiet_modtag := $(empty) $(empty) | |
124 | ||
125 | $(real-objs-m) : part-of-module := y | |
126 | $(real-objs-m:.o=.i) : part-of-module := y | |
127 | $(real-objs-m:.o=.s) : part-of-module := y | |
128 | $(real-objs-m:.o=.lst): part-of-module := y | |
129 | ||
130 | $(real-objs-m) : quiet_modtag := [M] | |
131 | $(real-objs-m:.o=.i) : quiet_modtag := [M] | |
132 | $(real-objs-m:.o=.s) : quiet_modtag := [M] | |
133 | $(real-objs-m:.o=.lst): quiet_modtag := [M] | |
134 | ||
135 | $(obj-m) : quiet_modtag := [M] | |
136 | ||
137 | # Default for not multi-part modules | |
138 | modname = $(basetarget) | |
139 | ||
140 | $(multi-objs-m) : modname = $(modname-multi) | |
141 | $(multi-objs-m:.o=.i) : modname = $(modname-multi) | |
142 | $(multi-objs-m:.o=.s) : modname = $(modname-multi) | |
143 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi) | |
144 | $(multi-objs-y) : modname = $(modname-multi) | |
145 | $(multi-objs-y:.o=.i) : modname = $(modname-multi) | |
146 | $(multi-objs-y:.o=.s) : modname = $(modname-multi) | |
147 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi) | |
148 | ||
149 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ | |
150 | cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $< | |
151 | ||
152 | $(obj)/%.s: $(src)/%.c FORCE | |
153 | $(call if_changed_dep,cc_s_c) | |
154 | ||
155 | quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@ | |
156 | cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $< | |
157 | ||
158 | $(obj)/%.i: $(src)/%.c FORCE | |
159 | $(call if_changed_dep,cc_i_c) | |
160 | ||
161 | cmd_gensymtypes = \ | |
162 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ | |
163 | $(GENKSYMS) $(if $(1), -T $(2)) \ | |
164 | $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \ | |
165 | $(if $(KBUILD_PRESERVE),-p) \ | |
166 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) | |
167 | ||
168 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ | |
169 | cmd_cc_symtypes_c = \ | |
170 | set -e; \ | |
171 | $(call cmd_gensymtypes,true,$@) >/dev/null; \ | |
172 | test -s $@ || rm -f $@ | |
173 | ||
174 | $(obj)/%.symtypes : $(src)/%.c FORCE | |
175 | $(call cmd,cc_symtypes_c) | |
176 | ||
177 | # C (.c) files | |
178 | # The C file is compiled and updated dependency information is generated. | |
179 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) | |
180 | ||
181 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ | |
182 | ||
183 | ifndef CONFIG_MODVERSIONS | |
184 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< | |
185 | ||
186 | else | |
187 | # When module versioning is enabled the following steps are executed: | |
188 | # o compile a .tmp_<file>.o from <file>.c | |
189 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does | |
190 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and | |
191 | # are done. | |
192 | # o otherwise, we calculate symbol versions using the good old | |
193 | # genksyms on the preprocessed source and postprocess them in a way | |
194 | # that they are usable as a linker script | |
195 | # o generate <file>.o from .tmp_<file>.o using the linker to | |
196 | # replace the unresolved symbols __crc_exported_symbol with | |
197 | # the actual value of the checksum generated by genksyms | |
198 | ||
199 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< | |
200 | cmd_modversions = \ | |
201 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ | |
202 | $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ | |
203 | > $(@D)/.tmp_$(@F:.o=.ver); \ | |
204 | \ | |
205 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ | |
206 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
207 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ | |
208 | else \ | |
209 | mv -f $(@D)/.tmp_$(@F) $@; \ | |
210 | fi; | |
211 | endif | |
212 | ||
213 | ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
214 | ifdef BUILD_C_RECORDMCOUNT | |
215 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") | |
216 | RECORDMCOUNT_FLAGS = -w | |
217 | endif | |
218 | # Due to recursion, we must skip empty.o. | |
219 | # The empty.o file is created in the make process in order to determine | |
220 | # the target endianness and word size. It is made before all other C | |
221 | # files, including recordmcount. | |
222 | sub_cmd_record_mcount = \ | |
223 | if [ $(@) != "scripts/mod/empty.o" ]; then \ | |
224 | $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ | |
225 | fi; | |
226 | recordmcount_source := $(srctree)/scripts/recordmcount.c \ | |
227 | $(srctree)/scripts/recordmcount.h | |
228 | else | |
229 | sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ | |
230 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ | |
231 | "$(if $(CONFIG_64BIT),64,32)" \ | |
232 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \ | |
233 | "$(LD)" "$(NM)" "$(RM)" "$(MV)" \ | |
234 | "$(if $(part-of-module),1,0)" "$(@)"; | |
235 | recordmcount_source := $(srctree)/scripts/recordmcount.pl | |
236 | endif | |
237 | cmd_record_mcount = \ | |
238 | if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \ | |
239 | "$(CC_FLAGS_FTRACE)" ]; then \ | |
240 | $(sub_cmd_record_mcount) \ | |
241 | fi; | |
242 | endif | |
243 | ||
244 | define rule_cc_o_c | |
245 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ | |
246 | $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \ | |
247 | $(cmd_modversions) \ | |
248 | $(call echo-cmd,record_mcount) \ | |
249 | $(cmd_record_mcount) \ | |
250 | scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \ | |
251 | $(dot-target).tmp; \ | |
252 | rm -f $(depfile); \ | |
253 | mv -f $(dot-target).tmp $(dot-target).cmd | |
254 | endef | |
255 | ||
256 | # Built-in and composite module parts | |
257 | $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE | |
258 | $(call cmd,force_checksrc) | |
259 | $(call if_changed_rule,cc_o_c) | |
260 | ||
261 | # Single-part modules are special since we need to mark them in $(MODVERDIR) | |
262 | ||
263 | $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE | |
264 | $(call cmd,force_checksrc) | |
265 | $(call if_changed_rule,cc_o_c) | |
266 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod) | |
267 | ||
268 | quiet_cmd_cc_lst_c = MKLST $@ | |
269 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ | |
270 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ | |
271 | System.map $(OBJDUMP) > $@ | |
272 | ||
273 | $(obj)/%.lst: $(src)/%.c FORCE | |
274 | $(call if_changed_dep,cc_lst_c) | |
275 | ||
276 | # Compile assembler sources (.S) | |
277 | # --------------------------------------------------------------------------- | |
278 | ||
279 | modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) | |
280 | ||
281 | $(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) | |
282 | $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) | |
283 | ||
284 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@ | |
285 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $< | |
286 | ||
287 | $(obj)/%.s: $(src)/%.S FORCE | |
288 | $(call if_changed_dep,as_s_S) | |
289 | ||
290 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ | |
291 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< | |
292 | ||
293 | $(obj)/%.o: $(src)/%.S FORCE | |
294 | $(call if_changed_dep,as_o_S) | |
295 | ||
296 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) | |
297 | targets += $(extra-y) $(MAKECMDGOALS) $(always) | |
298 | ||
299 | # Linker scripts preprocessor (.lds.S -> .lds) | |
300 | # --------------------------------------------------------------------------- | |
301 | quiet_cmd_cpp_lds_S = LDS $@ | |
302 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \ | |
303 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< | |
304 | ||
305 | $(obj)/%.lds: $(src)/%.lds.S FORCE | |
306 | $(call if_changed_dep,cpp_lds_S) | |
307 | ||
308 | # ASN.1 grammar | |
309 | # --------------------------------------------------------------------------- | |
310 | quiet_cmd_asn1_compiler = ASN.1 $@ | |
311 | cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ | |
312 | $(subst .h,.c,$@) $(subst .c,.h,$@) | |
313 | ||
314 | .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h | |
315 | ||
316 | $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler | |
317 | $(call cmd,asn1_compiler) | |
318 | ||
319 | # Build the compiled-in targets | |
320 | # --------------------------------------------------------------------------- | |
321 | ||
322 | # To build objects in subdirs, we need to descend into the directories | |
323 | $(sort $(subdir-obj-y)): $(subdir-ym) ; | |
324 | ||
325 | # | |
326 | # Rule to compile a set of .o files into one .o file | |
327 | # | |
328 | ifdef builtin-target | |
329 | quiet_cmd_link_o_target = LD $@ | |
330 | # If the list of objects to link is empty, just create an empty built-in.o | |
331 | cmd_link_o_target = $(if $(strip $(obj-y)),\ | |
332 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \ | |
333 | $(cmd_secanalysis),\ | |
334 | rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@) | |
335 | ||
336 | $(builtin-target): $(obj-y) FORCE | |
337 | $(call if_changed,link_o_target) | |
338 | ||
339 | targets += $(builtin-target) | |
340 | endif # builtin-target | |
341 | ||
342 | # | |
343 | # Rule to create modules.order file | |
344 | # | |
345 | # Create commands to either record .ko file or cat modules.order from | |
346 | # a subdirectory | |
347 | modorder-cmds = \ | |
348 | $(foreach m, $(modorder), \ | |
349 | $(if $(filter %/modules.order, $m), \ | |
350 | cat $m;, echo kernel/$m;)) | |
351 | ||
352 | $(modorder-target): $(subdir-ym) FORCE | |
353 | $(Q)(cat /dev/null; $(modorder-cmds)) > $@ | |
354 | ||
355 | # | |
356 | # Rule to compile a set of .o files into one .a file | |
357 | # | |
358 | ifdef lib-target | |
359 | quiet_cmd_link_l_target = AR $@ | |
360 | cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y) | |
361 | ||
362 | $(lib-target): $(lib-y) FORCE | |
363 | $(call if_changed,link_l_target) | |
364 | ||
365 | targets += $(lib-target) | |
366 | endif | |
367 | ||
368 | # | |
369 | # Rule to link composite objects | |
370 | # | |
371 | # Composite objects are specified in kbuild makefile as follows: | |
372 | # <composite-object>-objs := <list of .o files> | |
373 | # or | |
374 | # <composite-object>-y := <list of .o files> | |
375 | link_multi_deps = \ | |
376 | $(filter $(addprefix $(obj)/, \ | |
377 | $($(subst $(obj)/,,$(@:.o=-objs))) \ | |
378 | $($(subst $(obj)/,,$(@:.o=-y)))), $^) | |
379 | ||
380 | quiet_cmd_link_multi-y = LD $@ | |
381 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis) | |
382 | ||
383 | quiet_cmd_link_multi-m = LD [M] $@ | |
384 | cmd_link_multi-m = $(cmd_link_multi-y) | |
385 | ||
386 | $(multi-used-y): FORCE | |
387 | $(call if_changed,link_multi-y) | |
388 | $(call multi_depend, $(multi-used-y), .o, -objs -y) | |
389 | ||
390 | $(multi-used-m): FORCE | |
391 | $(call if_changed,link_multi-m) | |
392 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) | |
393 | $(call multi_depend, $(multi-used-m), .o, -objs -y) | |
394 | ||
395 | targets += $(multi-used-y) $(multi-used-m) | |
396 | ||
397 | ||
398 | # Descending | |
399 | # --------------------------------------------------------------------------- | |
400 | ||
401 | PHONY += $(subdir-ym) | |
402 | $(subdir-ym): | |
403 | $(Q)$(MAKE) $(build)=$@ | |
404 | ||
405 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
406 | # --------------------------------------------------------------------------- | |
407 | ||
408 | PHONY += FORCE | |
409 | ||
410 | FORCE: | |
411 | ||
412 | # Read all saved command lines and dependencies for the $(targets) we | |
413 | # may be building above, using $(if_changed{,_dep}). As an | |
414 | # optimization, we don't need to read them if the target does not | |
415 | # exist, we will rebuild anyway in that case. | |
416 | ||
417 | targets := $(wildcard $(sort $(targets))) | |
418 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) | |
419 | ||
420 | ifneq ($(cmd_files),) | |
421 | include $(cmd_files) | |
422 | endif | |
423 | ||
424 | # Declare the contents of the .PHONY variable as phony. We keep that | |
425 | # information in a variable se we can use it in if_changed and friends. | |
426 | ||
427 | .PHONY: $(PHONY) |