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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 EXTRA_CFLAGS) |
50 | endif |
51 | endif |
52 | include scripts/Makefile.lib |
53 | |
54 | ifdef host-progs |
55 | ifneq ($(hostprogs-y),$(host-progs)) |
56 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) |
57 | hostprogs-y += $(host-progs) |
58 | endif |
59 | endif |
60 | |
61 | # Do not include host rules unless needed |
62 | ifneq ($(hostprogs-y)$(hostprogs-m),) |
63 | include scripts/Makefile.host |
64 | endif |
65 | |
66 | ifneq ($(KBUILD_SRC),) |
67 | # Create output directory if not already present |
68 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) |
69 | |
70 | # Create directories for object files if directory does not exist |
71 | # Needed when obj-y := dir/file.o syntax is used |
72 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) |
73 | endif |
74 | |
75 | ifndef obj |
76 | $(warning kbuild: Makefile.build is included improperly) |
77 | endif |
78 | |
79 | # =========================================================================== |
80 | |
81 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),) |
82 | lib-target := $(obj)/lib.a |
83 | endif |
84 | |
85 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),) |
86 | builtin-target := $(obj)/built-in.o |
87 | endif |
88 | |
89 | modorder-target := $(obj)/modules.order |
90 | |
91 | # We keep a list of all modules in $(MODVERDIR) |
92 | |
93 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ |
94 | $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \ |
95 | $(subdir-ym) $(always) |
96 | @: |
97 | |
98 | # Linus' kernel sanity checking tool |
99 | ifneq ($(KBUILD_CHECKSRC),0) |
100 | ifeq ($(KBUILD_CHECKSRC),2) |
101 | quiet_cmd_force_checksrc = CHECK $< |
102 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; |
103 | else |
104 | quiet_cmd_checksrc = CHECK $< |
105 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; |
106 | endif |
107 | endif |
108 | |
109 | # Do section mismatch analysis for each module/built-in.o |
110 | ifdef CONFIG_DEBUG_SECTION_MISMATCH |
111 | cmd_secanalysis = ; scripts/mod/modpost $@ |
112 | endif |
113 | |
114 | # Compile C sources (.c) |
115 | # --------------------------------------------------------------------------- |
116 | |
117 | # Default is built-in, unless we know otherwise |
118 | modkern_cflags = $(if $(part-of-module), $(CFLAGS_MODULE), $(CFLAGS_KERNEL)) |
119 | quiet_modtag := $(empty) $(empty) |
120 | |
121 | $(real-objs-m) : part-of-module := y |
122 | $(real-objs-m:.o=.i) : part-of-module := y |
123 | $(real-objs-m:.o=.s) : part-of-module := y |
124 | $(real-objs-m:.o=.lst): part-of-module := y |
125 | |
126 | $(real-objs-m) : quiet_modtag := [M] |
127 | $(real-objs-m:.o=.i) : quiet_modtag := [M] |
128 | $(real-objs-m:.o=.s) : quiet_modtag := [M] |
129 | $(real-objs-m:.o=.lst): quiet_modtag := [M] |
130 | |
131 | $(obj-m) : quiet_modtag := [M] |
132 | |
133 | # Default for not multi-part modules |
134 | modname = $(basetarget) |
135 | |
136 | $(multi-objs-m) : modname = $(modname-multi) |
137 | $(multi-objs-m:.o=.i) : modname = $(modname-multi) |
138 | $(multi-objs-m:.o=.s) : modname = $(modname-multi) |
139 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi) |
140 | $(multi-objs-y) : modname = $(modname-multi) |
141 | $(multi-objs-y:.o=.i) : modname = $(modname-multi) |
142 | $(multi-objs-y:.o=.s) : modname = $(modname-multi) |
143 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi) |
144 | |
145 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ |
146 | cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $< |
147 | |
148 | $(obj)/%.s: $(src)/%.c FORCE |
149 | $(call if_changed_dep,cc_s_c) |
150 | |
151 | quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@ |
152 | cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $< |
153 | |
154 | $(obj)/%.i: $(src)/%.c FORCE |
155 | $(call if_changed_dep,cc_i_c) |
156 | |
157 | cmd_gensymtypes = \ |
158 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ |
159 | $(GENKSYMS) -T $@ -a $(ARCH) \ |
160 | $(if $(KBUILD_PRESERVE),-p) \ |
161 | $(if $(1),-r $(firstword $(wildcard $(@:.symtypes=.symref) /dev/null))) |
162 | |
163 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ |
164 | cmd_cc_symtypes_c = \ |
165 | set -e; \ |
166 | $(call cmd_gensymtypes, true) >/dev/null; \ |
167 | test -s $@ || rm -f $@ |
168 | |
169 | $(obj)/%.symtypes : $(src)/%.c FORCE |
170 | $(call cmd,cc_symtypes_c) |
171 | |
172 | # C (.c) files |
173 | # The C file is compiled and updated dependency information is generated. |
174 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) |
175 | |
176 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ |
177 | |
178 | ifndef CONFIG_MODVERSIONS |
179 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< |
180 | |
181 | else |
182 | # When module versioning is enabled the following steps are executed: |
183 | # o compile a .tmp_<file>.o from <file>.c |
184 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does |
185 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and |
186 | # are done. |
187 | # o otherwise, we calculate symbol versions using the good old |
188 | # genksyms on the preprocessed source and postprocess them in a way |
189 | # that they are usable as a linker script |
190 | # o generate <file>.o from .tmp_<file>.o using the linker to |
191 | # replace the unresolved symbols __crc_exported_symbol with |
192 | # the actual value of the checksum generated by genksyms |
193 | |
194 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< |
195 | cmd_modversions = \ |
196 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ |
197 | $(call cmd_gensymtypes, $(KBUILD_SYMTYPES)) \ |
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) $@; \ |
205 | fi; |
206 | endif |
207 | |
208 | ifdef CONFIG_FTRACE_MCOUNT_RECORD |
209 | cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ |
210 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ |
211 | "$(if $(CONFIG_64BIT),64,32)" \ |
212 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" \ |
213 | "$(if $(part-of-module),1,0)" "$(@)"; |
214 | endif |
215 | |
216 | define rule_cc_o_c |
217 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
218 | $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \ |
219 | $(cmd_modversions) \ |
220 | $(call echo-cmd,record_mcount) \ |
221 | $(cmd_record_mcount) \ |
222 | scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \ |
223 | $(dot-target).tmp; \ |
224 | rm -f $(depfile); \ |
225 | mv -f $(dot-target).tmp $(dot-target).cmd |
226 | endef |
227 | |
228 | # Built-in and composite module parts |
229 | $(obj)/%.o: $(src)/%.c FORCE |
230 | $(call cmd,force_checksrc) |
231 | $(call if_changed_rule,cc_o_c) |
232 | |
233 | # Single-part modules are special since we need to mark them in $(MODVERDIR) |
234 | |
235 | $(single-used-m): $(obj)/%.o: $(src)/%.c FORCE |
236 | $(call cmd,force_checksrc) |
237 | $(call if_changed_rule,cc_o_c) |
238 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod) |
239 | |
240 | quiet_cmd_cc_lst_c = MKLST $@ |
241 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ |
242 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ |
243 | System.map $(OBJDUMP) > $@ |
244 | |
245 | $(obj)/%.lst: $(src)/%.c FORCE |
246 | $(call if_changed_dep,cc_lst_c) |
247 | |
248 | # Compile assembler sources (.S) |
249 | # --------------------------------------------------------------------------- |
250 | |
251 | modkern_aflags := $(AFLAGS_KERNEL) |
252 | |
253 | $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE) |
254 | $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE) |
255 | |
256 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@ |
257 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $< |
258 | |
259 | $(obj)/%.s: $(src)/%.S FORCE |
260 | $(call if_changed_dep,as_s_S) |
261 | |
262 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ |
263 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< |
264 | |
265 | $(obj)/%.o: $(src)/%.S FORCE |
266 | $(call if_changed_dep,as_o_S) |
267 | |
268 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) |
269 | targets += $(extra-y) $(MAKECMDGOALS) $(always) |
270 | |
271 | # Linker scripts preprocessor (.lds.S -> .lds) |
272 | # --------------------------------------------------------------------------- |
273 | quiet_cmd_cpp_lds_S = LDS $@ |
274 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \ |
275 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< |
276 | |
277 | $(obj)/%.lds: $(src)/%.lds.S FORCE |
278 | $(call if_changed_dep,cpp_lds_S) |
279 | |
280 | # Build the compiled-in targets |
281 | # --------------------------------------------------------------------------- |
282 | |
283 | # To build objects in subdirs, we need to descend into the directories |
284 | $(sort $(subdir-obj-y)): $(subdir-ym) ; |
285 | |
286 | # |
287 | # Rule to compile a set of .o files into one .o file |
288 | # |
289 | ifdef builtin-target |
290 | quiet_cmd_link_o_target = LD $@ |
291 | # If the list of objects to link is empty, just create an empty built-in.o |
292 | cmd_link_o_target = $(if $(strip $(obj-y)),\ |
293 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \ |
294 | $(cmd_secanalysis),\ |
295 | rm -f $@; $(AR) rcs $@) |
296 | |
297 | $(builtin-target): $(obj-y) FORCE |
298 | $(call if_changed,link_o_target) |
299 | |
300 | targets += $(builtin-target) |
301 | endif # builtin-target |
302 | |
303 | # |
304 | # Rule to create modules.order file |
305 | # |
306 | # Create commands to either record .ko file or cat modules.order from |
307 | # a subdirectory |
308 | modorder-cmds = \ |
309 | $(foreach m, $(modorder), \ |
310 | $(if $(filter %/modules.order, $m), \ |
311 | cat $m;, echo kernel/$m;)) |
312 | |
313 | $(modorder-target): $(subdir-ym) FORCE |
314 | $(Q)(cat /dev/null; $(modorder-cmds)) > $@ |
315 | |
316 | # |
317 | # Rule to compile a set of .o files into one .a file |
318 | # |
319 | ifdef lib-target |
320 | quiet_cmd_link_l_target = AR $@ |
321 | cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y) |
322 | |
323 | $(lib-target): $(lib-y) FORCE |
324 | $(call if_changed,link_l_target) |
325 | |
326 | targets += $(lib-target) |
327 | endif |
328 | |
329 | # |
330 | # Rule to link composite objects |
331 | # |
332 | # Composite objects are specified in kbuild makefile as follows: |
333 | # <composite-object>-objs := <list of .o files> |
334 | # or |
335 | # <composite-object>-y := <list of .o files> |
336 | link_multi_deps = \ |
337 | $(filter $(addprefix $(obj)/, \ |
338 | $($(subst $(obj)/,,$(@:.o=-objs))) \ |
339 | $($(subst $(obj)/,,$(@:.o=-y)))), $^) |
340 | |
341 | quiet_cmd_link_multi-y = LD $@ |
342 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis) |
343 | |
344 | quiet_cmd_link_multi-m = LD [M] $@ |
345 | cmd_link_multi-m = $(cmd_link_multi-y) |
346 | |
347 | # We would rather have a list of rules like |
348 | # foo.o: $(foo-objs) |
349 | # but that's not so easy, so we rather make all composite objects depend |
350 | # on the set of all their parts |
351 | $(multi-used-y) : %.o: $(multi-objs-y) FORCE |
352 | $(call if_changed,link_multi-y) |
353 | |
354 | $(multi-used-m) : %.o: $(multi-objs-m) FORCE |
355 | $(call if_changed,link_multi-m) |
356 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) |
357 | |
358 | targets += $(multi-used-y) $(multi-used-m) |
359 | |
360 | |
361 | # Descending |
362 | # --------------------------------------------------------------------------- |
363 | |
364 | PHONY += $(subdir-ym) |
365 | $(subdir-ym): |
366 | $(Q)$(MAKE) $(build)=$@ |
367 | |
368 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. |
369 | # --------------------------------------------------------------------------- |
370 | |
371 | PHONY += FORCE |
372 | |
373 | FORCE: |
374 | |
375 | # Read all saved command lines and dependencies for the $(targets) we |
376 | # may be building above, using $(if_changed{,_dep}). As an |
377 | # optimization, we don't need to read them if the target does not |
378 | # exist, we will rebuild anyway in that case. |
379 | |
380 | targets := $(wildcard $(sort $(targets))) |
381 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) |
382 | |
383 | ifneq ($(cmd_files),) |
384 | include $(cmd_files) |
385 | endif |
386 | |
387 | |
388 | # Declare the contents of the .PHONY variable as phony. We keep that |
389 | # information in a variable se we can use it in if_changed and friends. |
390 | |
391 | .PHONY: $(PHONY) |
392 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9