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Commit | Line | Data |
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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 | # Read auto.conf if it exists, otherwise ignore | |
31 | -include include/config/auto.conf | |
32 | ||
33 | include scripts/Kbuild.include | |
34 | ||
35 | # For backward compatibility check that these variables do not change | |
36 | save-cflags := $(CFLAGS) | |
37 | ||
38 | # The filename Kbuild has precedence over Makefile | |
39 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) | |
40 | kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) | |
41 | include $(kbuild-file) | |
42 | ||
43 | # If the save-* variables changed error out | |
44 | ifeq ($(KBUILD_NOPEDANTIC),) | |
45 | ifneq ("$(save-cflags)","$(CFLAGS)") | |
46 | $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS) | |
47 | endif | |
48 | endif | |
49 | include scripts/Makefile.lib | |
50 | ||
51 | ifdef host-progs | |
52 | ifneq ($(hostprogs-y),$(host-progs)) | |
53 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) | |
54 | hostprogs-y += $(host-progs) | |
55 | endif | |
56 | endif | |
57 | ||
58 | # Do not include host rules unless needed | |
59 | ifneq ($(hostprogs-y)$(hostprogs-m),) | |
60 | include scripts/Makefile.host | |
61 | endif | |
62 | ||
63 | ifneq ($(KBUILD_SRC),) | |
64 | # Create output directory if not already present | |
65 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) | |
66 | ||
67 | # Create directories for object files if directory does not exist | |
68 | # Needed when obj-y := dir/file.o syntax is used | |
69 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) | |
70 | endif | |
71 | ||
72 | ifndef obj | |
73 | $(warning kbuild: Makefile.build is included improperly) | |
74 | endif | |
75 | ||
76 | # =========================================================================== | |
77 | ||
78 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),) | |
79 | lib-target := $(obj)/lib.a | |
80 | endif | |
81 | ||
82 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),) | |
83 | builtin-target := $(obj)/built-in.o | |
84 | endif | |
85 | ||
86 | modorder-target := $(obj)/modules.order | |
87 | ||
88 | # We keep a list of all modules in $(MODVERDIR) | |
89 | ||
90 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ | |
91 | $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \ | |
92 | $(subdir-ym) $(always) | |
93 | @: | |
94 | ||
95 | # Linus' kernel sanity checking tool | |
96 | ifneq ($(KBUILD_CHECKSRC),0) | |
97 | ifeq ($(KBUILD_CHECKSRC),2) | |
98 | quiet_cmd_force_checksrc = CHECK $< | |
99 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
100 | else | |
101 | quiet_cmd_checksrc = CHECK $< | |
102 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
103 | endif | |
104 | endif | |
105 | ||
106 | # Do section mismatch analysis for each module/built-in.o | |
107 | ifdef CONFIG_DEBUG_SECTION_MISMATCH | |
108 | cmd_secanalysis = ; scripts/mod/modpost $@ | |
109 | endif | |
110 | ||
111 | # Compile C sources (.c) | |
112 | # --------------------------------------------------------------------------- | |
113 | ||
114 | # Default is built-in, unless we know otherwise | |
115 | modkern_cflags = $(if $(part-of-module), $(CFLAGS_MODULE), $(CFLAGS_KERNEL)) | |
116 | quiet_modtag := $(empty) $(empty) | |
117 | ||
118 | $(real-objs-m) : part-of-module := y | |
119 | $(real-objs-m:.o=.i) : part-of-module := y | |
120 | $(real-objs-m:.o=.s) : part-of-module := y | |
121 | $(real-objs-m:.o=.lst): part-of-module := y | |
122 | ||
123 | $(real-objs-m) : quiet_modtag := [M] | |
124 | $(real-objs-m:.o=.i) : quiet_modtag := [M] | |
125 | $(real-objs-m:.o=.s) : quiet_modtag := [M] | |
126 | $(real-objs-m:.o=.lst): quiet_modtag := [M] | |
127 | ||
128 | $(obj-m) : quiet_modtag := [M] | |
129 | ||
130 | # Default for not multi-part modules | |
131 | modname = $(basetarget) | |
132 | ||
133 | $(multi-objs-m) : modname = $(modname-multi) | |
134 | $(multi-objs-m:.o=.i) : modname = $(modname-multi) | |
135 | $(multi-objs-m:.o=.s) : modname = $(modname-multi) | |
136 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi) | |
137 | $(multi-objs-y) : modname = $(modname-multi) | |
138 | $(multi-objs-y:.o=.i) : modname = $(modname-multi) | |
139 | $(multi-objs-y:.o=.s) : modname = $(modname-multi) | |
140 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi) | |
141 | ||
142 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ | |
143 | cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $< | |
144 | ||
145 | $(obj)/%.s: $(src)/%.c FORCE | |
146 | $(call if_changed_dep,cc_s_c) | |
147 | ||
148 | quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@ | |
149 | cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $< | |
150 | ||
151 | $(obj)/%.i: $(src)/%.c FORCE | |
152 | $(call if_changed_dep,cc_i_c) | |
153 | ||
154 | cmd_gensymtypes = \ | |
155 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ | |
156 | $(GENKSYMS) -T $@ -a $(ARCH) \ | |
157 | $(if $(KBUILD_PRESERVE),-p) \ | |
158 | $(if $(1),-r $(firstword $(wildcard $(@:.symtypes=.symref) /dev/null))) | |
159 | ||
160 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ | |
161 | cmd_cc_symtypes_c = \ | |
162 | set -e; \ | |
163 | $(call cmd_gensymtypes, true) >/dev/null; \ | |
164 | test -s $@ || rm -f $@ | |
165 | ||
166 | $(obj)/%.symtypes : $(src)/%.c FORCE | |
167 | $(call cmd,cc_symtypes_c) | |
168 | ||
169 | # C (.c) files | |
170 | # The C file is compiled and updated dependency information is generated. | |
171 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) | |
172 | ||
173 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ | |
174 | ||
175 | ifndef CONFIG_MODVERSIONS | |
176 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< | |
177 | ||
178 | else | |
179 | # When module versioning is enabled the following steps are executed: | |
180 | # o compile a .tmp_<file>.o from <file>.c | |
181 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does | |
182 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and | |
183 | # are done. | |
184 | # o otherwise, we calculate symbol versions using the good old | |
185 | # genksyms on the preprocessed source and postprocess them in a way | |
186 | # that they are usable as a linker script | |
187 | # o generate <file>.o from .tmp_<file>.o using the linker to | |
188 | # replace the unresolved symbols __crc_exported_symbol with | |
189 | # the actual value of the checksum generated by genksyms | |
190 | ||
191 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< | |
192 | cmd_modversions = \ | |
193 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ | |
194 | $(call cmd_gensymtypes, $(KBUILD_SYMTYPES)) \ | |
195 | > $(@D)/.tmp_$(@F:.o=.ver); \ | |
196 | \ | |
197 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ | |
198 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
199 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ | |
200 | else \ | |
201 | mv -f $(@D)/.tmp_$(@F) $@; \ | |
202 | fi; | |
203 | endif | |
204 | ||
205 | ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
206 | cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ | |
207 | "$(if $(CONFIG_64BIT),64,32)" \ | |
208 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" \ | |
209 | "$(if $(part-of-module),1,0)" "$(@)"; | |
210 | endif | |
211 | ||
212 | define rule_cc_o_c | |
213 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ | |
214 | $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \ | |
215 | $(cmd_modversions) \ | |
216 | $(cmd_record_mcount) \ | |
217 | scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \ | |
218 | $(dot-target).tmp; \ | |
219 | rm -f $(depfile); \ | |
220 | mv -f $(dot-target).tmp $(dot-target).cmd | |
221 | endef | |
222 | ||
223 | # Built-in and composite module parts | |
224 | $(obj)/%.o: $(src)/%.c FORCE | |
225 | $(call cmd,force_checksrc) | |
226 | $(call if_changed_rule,cc_o_c) | |
227 | ||
228 | # Single-part modules are special since we need to mark them in $(MODVERDIR) | |
229 | ||
230 | $(single-used-m): $(obj)/%.o: $(src)/%.c FORCE | |
231 | $(call cmd,force_checksrc) | |
232 | $(call if_changed_rule,cc_o_c) | |
233 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod) | |
234 | ||
235 | quiet_cmd_cc_lst_c = MKLST $@ | |
236 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ | |
237 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ | |
238 | System.map $(OBJDUMP) > $@ | |
239 | ||
240 | $(obj)/%.lst: $(src)/%.c FORCE | |
241 | $(call if_changed_dep,cc_lst_c) | |
242 | ||
243 | # Compile assembler sources (.S) | |
244 | # --------------------------------------------------------------------------- | |
245 | ||
246 | modkern_aflags := $(AFLAGS_KERNEL) | |
247 | ||
248 | $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE) | |
249 | $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE) | |
250 | ||
251 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@ | |
252 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $< | |
253 | ||
254 | $(obj)/%.s: $(src)/%.S FORCE | |
255 | $(call if_changed_dep,as_s_S) | |
256 | ||
257 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ | |
258 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< | |
259 | ||
260 | $(obj)/%.o: $(src)/%.S FORCE | |
261 | $(call if_changed_dep,as_o_S) | |
262 | ||
263 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) | |
264 | targets += $(extra-y) $(MAKECMDGOALS) $(always) | |
265 | ||
266 | # Linker scripts preprocessor (.lds.S -> .lds) | |
267 | # --------------------------------------------------------------------------- | |
268 | quiet_cmd_cpp_lds_S = LDS $@ | |
269 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $< | |
270 | ||
271 | $(obj)/%.lds: $(src)/%.lds.S FORCE | |
272 | $(call if_changed_dep,cpp_lds_S) | |
273 | ||
274 | # Build the compiled-in targets | |
275 | # --------------------------------------------------------------------------- | |
276 | ||
277 | # To build objects in subdirs, we need to descend into the directories | |
278 | $(sort $(subdir-obj-y)): $(subdir-ym) ; | |
279 | ||
280 | # | |
281 | # Rule to compile a set of .o files into one .o file | |
282 | # | |
283 | ifdef builtin-target | |
284 | quiet_cmd_link_o_target = LD $@ | |
285 | # If the list of objects to link is empty, just create an empty built-in.o | |
286 | cmd_link_o_target = $(if $(strip $(obj-y)),\ | |
287 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \ | |
288 | $(cmd_secanalysis),\ | |
289 | rm -f $@; $(AR) rcs $@) | |
290 | ||
291 | $(builtin-target): $(obj-y) FORCE | |
292 | $(call if_changed,link_o_target) | |
293 | ||
294 | targets += $(builtin-target) | |
295 | endif # builtin-target | |
296 | ||
297 | # | |
298 | # Rule to create modules.order file | |
299 | # | |
300 | # Create commands to either record .ko file or cat modules.order from | |
301 | # a subdirectory | |
302 | modorder-cmds = \ | |
303 | $(foreach m, $(modorder), \ | |
304 | $(if $(filter %/modules.order, $m), \ | |
305 | cat $m;, echo kernel/$m;)) | |
306 | ||
307 | $(modorder-target): $(subdir-ym) FORCE | |
308 | $(Q)(cat /dev/null; $(modorder-cmds)) > $@ | |
309 | ||
310 | # | |
311 | # Rule to compile a set of .o files into one .a file | |
312 | # | |
313 | ifdef lib-target | |
314 | quiet_cmd_link_l_target = AR $@ | |
315 | cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y) | |
316 | ||
317 | $(lib-target): $(lib-y) FORCE | |
318 | $(call if_changed,link_l_target) | |
319 | ||
320 | targets += $(lib-target) | |
321 | endif | |
322 | ||
323 | # | |
324 | # Rule to link composite objects | |
325 | # | |
326 | # Composite objects are specified in kbuild makefile as follows: | |
327 | # <composite-object>-objs := <list of .o files> | |
328 | # or | |
329 | # <composite-object>-y := <list of .o files> | |
330 | link_multi_deps = \ | |
331 | $(filter $(addprefix $(obj)/, \ | |
332 | $($(subst $(obj)/,,$(@:.o=-objs))) \ | |
333 | $($(subst $(obj)/,,$(@:.o=-y)))), $^) | |
334 | ||
335 | quiet_cmd_link_multi-y = LD $@ | |
336 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis) | |
337 | ||
338 | quiet_cmd_link_multi-m = LD [M] $@ | |
339 | cmd_link_multi-m = $(cmd_link_multi-y) | |
340 | ||
341 | # We would rather have a list of rules like | |
342 | # foo.o: $(foo-objs) | |
343 | # but that's not so easy, so we rather make all composite objects depend | |
344 | # on the set of all their parts | |
345 | $(multi-used-y) : %.o: $(multi-objs-y) FORCE | |
346 | $(call if_changed,link_multi-y) | |
347 | ||
348 | $(multi-used-m) : %.o: $(multi-objs-m) FORCE | |
349 | $(call if_changed,link_multi-m) | |
350 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) | |
351 | ||
352 | targets += $(multi-used-y) $(multi-used-m) | |
353 | ||
354 | ||
355 | # Descending | |
356 | # --------------------------------------------------------------------------- | |
357 | ||
358 | PHONY += $(subdir-ym) | |
359 | $(subdir-ym): | |
360 | $(Q)$(MAKE) $(build)=$@ | |
361 | ||
362 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
363 | # --------------------------------------------------------------------------- | |
364 | ||
365 | PHONY += FORCE | |
366 | ||
367 | FORCE: | |
368 | ||
369 | # Read all saved command lines and dependencies for the $(targets) we | |
370 | # may be building above, using $(if_changed{,_dep}). As an | |
371 | # optimization, we don't need to read them if the target does not | |
372 | # exist, we will rebuild anyway in that case. | |
373 | ||
374 | targets := $(wildcard $(sort $(targets))) | |
375 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) | |
376 | ||
377 | ifneq ($(cmd_files),) | |
378 | include $(cmd_files) | |
379 | endif | |
380 | ||
381 | ||
382 | # Declare the contents of the .PHONY variable as phony. We keep that | |
383 | # information in a variable se we can use it in if_changed and friends. | |
384 | ||
385 | .PHONY: $(PHONY) |