Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | # ========================================================================== |
2 | # Building | |
3 | # ========================================================================== | |
4 | ||
5 | src := $(obj) | |
6 | ||
4f193362 | 7 | PHONY := __build |
1da177e4 LT |
8 | __build: |
9 | ||
10 | # Read .config if it exist, otherwise ignore | |
c955ccaf | 11 | -include include/config/auto.conf |
1da177e4 | 12 | |
20a468b5 SR |
13 | include scripts/Kbuild.include |
14 | ||
2a691470 | 15 | # The filename Kbuild has precedence over Makefile |
db8c1a7b SR |
16 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) |
17 | include $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, $(kbuild-dir)/Makefile) | |
1da177e4 LT |
18 | |
19 | include scripts/Makefile.lib | |
20 | ||
21 | ifdef host-progs | |
22 | ifneq ($(hostprogs-y),$(host-progs)) | |
23 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) | |
24 | hostprogs-y += $(host-progs) | |
25 | endif | |
26 | endif | |
27 | ||
28 | # Do not include host rules unles needed | |
29 | ifneq ($(hostprogs-y)$(hostprogs-m),) | |
30 | include scripts/Makefile.host | |
31 | endif | |
32 | ||
33 | ifneq ($(KBUILD_SRC),) | |
34 | # Create output directory if not already present | |
35 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) | |
36 | ||
37 | # Create directories for object files if directory does not exist | |
38 | # Needed when obj-y := dir/file.o syntax is used | |
39 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) | |
40 | endif | |
41 | ||
42 | ||
43 | ifdef EXTRA_TARGETS | |
44 | $(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6. Please fix!) | |
45 | endif | |
46 | ||
47 | ifdef build-targets | |
48 | $(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6. Please fix!) | |
49 | endif | |
50 | ||
51 | ifdef export-objs | |
52 | $(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6. Please fix!) | |
53 | endif | |
54 | ||
55 | ifdef O_TARGET | |
56 | $(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6. Please fix!) | |
57 | endif | |
58 | ||
59 | ifdef L_TARGET | |
60 | $(error kbuild: $(obj)/Makefile - Use of L_TARGET is replaced by lib-y in 2.6. Please fix!) | |
61 | endif | |
62 | ||
63 | ifdef list-multi | |
64 | $(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6. Please fix!) | |
65 | endif | |
66 | ||
67 | ifndef obj | |
68 | $(warning kbuild: Makefile.build is included improperly) | |
69 | endif | |
70 | ||
71 | # =========================================================================== | |
72 | ||
73 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),) | |
74 | lib-target := $(obj)/lib.a | |
75 | endif | |
76 | ||
77 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),) | |
78 | builtin-target := $(obj)/built-in.o | |
79 | endif | |
80 | ||
81 | # We keep a list of all modules in $(MODVERDIR) | |
82 | ||
83 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ | |
84 | $(if $(KBUILD_MODULES),$(obj-m)) \ | |
85 | $(subdir-ym) $(always) | |
86 | @: | |
87 | ||
88 | # Linus' kernel sanity checking tool | |
89 | ifneq ($(KBUILD_CHECKSRC),0) | |
90 | ifeq ($(KBUILD_CHECKSRC),2) | |
91 | quiet_cmd_force_checksrc = CHECK $< | |
92 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
93 | else | |
94 | quiet_cmd_checksrc = CHECK $< | |
95 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
96 | endif | |
97 | endif | |
98 | ||
99 | ||
100 | # Compile C sources (.c) | |
101 | # --------------------------------------------------------------------------- | |
102 | ||
103 | # Default is built-in, unless we know otherwise | |
104 | modkern_cflags := $(CFLAGS_KERNEL) | |
105 | quiet_modtag := $(empty) $(empty) | |
106 | ||
107 | $(real-objs-m) : modkern_cflags := $(CFLAGS_MODULE) | |
108 | $(real-objs-m:.o=.i) : modkern_cflags := $(CFLAGS_MODULE) | |
109 | $(real-objs-m:.o=.s) : modkern_cflags := $(CFLAGS_MODULE) | |
110 | $(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE) | |
111 | ||
112 | $(real-objs-m) : quiet_modtag := [M] | |
113 | $(real-objs-m:.o=.i) : quiet_modtag := [M] | |
114 | $(real-objs-m:.o=.s) : quiet_modtag := [M] | |
115 | $(real-objs-m:.o=.lst): quiet_modtag := [M] | |
116 | ||
117 | $(obj-m) : quiet_modtag := [M] | |
118 | ||
119 | # Default for not multi-part modules | |
5e8d780d | 120 | modname = $(basetarget) |
1da177e4 LT |
121 | |
122 | $(multi-objs-m) : modname = $(modname-multi) | |
123 | $(multi-objs-m:.o=.i) : modname = $(modname-multi) | |
124 | $(multi-objs-m:.o=.s) : modname = $(modname-multi) | |
125 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi) | |
126 | $(multi-objs-y) : modname = $(modname-multi) | |
127 | $(multi-objs-y:.o=.i) : modname = $(modname-multi) | |
128 | $(multi-objs-y:.o=.s) : modname = $(modname-multi) | |
129 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi) | |
130 | ||
131 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ | |
7d185983 | 132 | cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $< |
1da177e4 | 133 | |
767e581d | 134 | $(obj)/%.s: $(src)/%.c FORCE |
1da177e4 LT |
135 | $(call if_changed_dep,cc_s_c) |
136 | ||
137 | quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@ | |
138 | cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $< | |
139 | ||
767e581d | 140 | $(obj)/%.i: $(src)/%.c FORCE |
1da177e4 LT |
141 | $(call if_changed_dep,cc_i_c) |
142 | ||
15fde675 AG |
143 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ |
144 | cmd_cc_symtypes_c = \ | |
145 | $(CPP) -D__GENKSYMS__ $(c_flags) $< \ | |
146 | | $(GENKSYMS) -T $@ >/dev/null; \ | |
147 | test -s $@ || rm -f $@ | |
148 | ||
767e581d | 149 | $(obj)/%.symtypes : $(src)/%.c FORCE |
15fde675 AG |
150 | $(call if_changed_dep,cc_symtypes_c) |
151 | ||
1da177e4 LT |
152 | # C (.c) files |
153 | # The C file is compiled and updated dependency information is generated. | |
154 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) | |
155 | ||
156 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ | |
157 | ||
158 | ifndef CONFIG_MODVERSIONS | |
159 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< | |
160 | ||
161 | else | |
162 | # When module versioning is enabled the following steps are executed: | |
163 | # o compile a .tmp_<file>.o from <file>.c | |
164 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does | |
165 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and | |
166 | # are done. | |
167 | # o otherwise, we calculate symbol versions using the good old | |
168 | # genksyms on the preprocessed source and postprocess them in a way | |
169 | # that they are usable as a linker script | |
170 | # o generate <file>.o from .tmp_<file>.o using the linker to | |
171 | # replace the unresolved symbols __crc_exported_symbol with | |
172 | # the actual value of the checksum generated by genksyms | |
173 | ||
174 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< | |
175 | cmd_modversions = \ | |
176 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ | |
177 | $(CPP) -D__GENKSYMS__ $(c_flags) $< \ | |
15fde675 AG |
178 | | $(GENKSYMS) $(if $(KBUILD_SYMTYPES), \ |
179 | -T $(@D)/$(@F:.o=.symtypes)) -a $(ARCH) \ | |
1da177e4 LT |
180 | > $(@D)/.tmp_$(@F:.o=.ver); \ |
181 | \ | |
182 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ | |
183 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
184 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ | |
185 | else \ | |
cfca82f2 | 186 | mv -f $(@D)/.tmp_$(@F) $@; \ |
1da177e4 LT |
187 | fi; |
188 | endif | |
189 | ||
190 | define rule_cc_o_c | |
6176aa9a JB |
191 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
192 | $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \ | |
1da177e4 | 193 | $(cmd_modversions) \ |
48f1f058 SR |
194 | scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \ |
195 | $(dot-target).tmp; \ | |
1da177e4 | 196 | rm -f $(depfile); \ |
48f1f058 | 197 | mv -f $(dot-target).tmp $(dot-target).cmd |
1da177e4 LT |
198 | endef |
199 | ||
200 | # Built-in and composite module parts | |
767e581d | 201 | $(obj)/%.o: $(src)/%.c FORCE |
1da177e4 LT |
202 | $(call cmd,force_checksrc) |
203 | $(call if_changed_rule,cc_o_c) | |
204 | ||
205 | # Single-part modules are special since we need to mark them in $(MODVERDIR) | |
206 | ||
767e581d | 207 | $(single-used-m): $(obj)/%.o: $(src)/%.c FORCE |
1da177e4 LT |
208 | $(call cmd,force_checksrc) |
209 | $(call if_changed_rule,cc_o_c) | |
210 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod) | |
211 | ||
212 | quiet_cmd_cc_lst_c = MKLST $@ | |
213 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ | |
214 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ | |
215 | System.map $(OBJDUMP) > $@ | |
216 | ||
767e581d | 217 | $(obj)/%.lst: $(src)/%.c FORCE |
1da177e4 LT |
218 | $(call if_changed_dep,cc_lst_c) |
219 | ||
220 | # Compile assembler sources (.S) | |
221 | # --------------------------------------------------------------------------- | |
222 | ||
223 | modkern_aflags := $(AFLAGS_KERNEL) | |
224 | ||
225 | $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE) | |
226 | $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE) | |
227 | ||
228 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@ | |
229 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $< | |
230 | ||
767e581d | 231 | $(obj)/%.s: $(src)/%.S FORCE |
1da177e4 LT |
232 | $(call if_changed_dep,as_s_S) |
233 | ||
234 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ | |
235 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< | |
236 | ||
767e581d | 237 | $(obj)/%.o: $(src)/%.S FORCE |
1da177e4 LT |
238 | $(call if_changed_dep,as_o_S) |
239 | ||
240 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) | |
241 | targets += $(extra-y) $(MAKECMDGOALS) $(always) | |
242 | ||
243 | # Linker scripts preprocessor (.lds.S -> .lds) | |
244 | # --------------------------------------------------------------------------- | |
245 | quiet_cmd_cpp_lds_S = LDS $@ | |
246 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $< | |
247 | ||
767e581d | 248 | $(obj)/%.lds: $(src)/%.lds.S FORCE |
1da177e4 LT |
249 | $(call if_changed_dep,cpp_lds_S) |
250 | ||
251 | # Build the compiled-in targets | |
252 | # --------------------------------------------------------------------------- | |
253 | ||
254 | # To build objects in subdirs, we need to descend into the directories | |
255 | $(sort $(subdir-obj-y)): $(subdir-ym) ; | |
256 | ||
257 | # | |
258 | # Rule to compile a set of .o files into one .o file | |
259 | # | |
260 | ifdef builtin-target | |
261 | quiet_cmd_link_o_target = LD $@ | |
262 | # If the list of objects to link is empty, just create an empty built-in.o | |
263 | cmd_link_o_target = $(if $(strip $(obj-y)),\ | |
264 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\ | |
265 | rm -f $@; $(AR) rcs $@) | |
266 | ||
267 | $(builtin-target): $(obj-y) FORCE | |
268 | $(call if_changed,link_o_target) | |
269 | ||
270 | targets += $(builtin-target) | |
271 | endif # builtin-target | |
272 | ||
273 | # | |
274 | # Rule to compile a set of .o files into one .a file | |
275 | # | |
276 | ifdef lib-target | |
277 | quiet_cmd_link_l_target = AR $@ | |
278 | cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y) | |
279 | ||
280 | $(lib-target): $(lib-y) FORCE | |
281 | $(call if_changed,link_l_target) | |
282 | ||
283 | targets += $(lib-target) | |
284 | endif | |
285 | ||
286 | # | |
287 | # Rule to link composite objects | |
288 | # | |
289 | # Composite objects are specified in kbuild makefile as follows: | |
290 | # <composite-object>-objs := <list of .o files> | |
291 | # or | |
292 | # <composite-object>-y := <list of .o files> | |
293 | link_multi_deps = \ | |
294 | $(filter $(addprefix $(obj)/, \ | |
295 | $($(subst $(obj)/,,$(@:.o=-objs))) \ | |
296 | $($(subst $(obj)/,,$(@:.o=-y)))), $^) | |
297 | ||
298 | quiet_cmd_link_multi-y = LD $@ | |
299 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) | |
300 | ||
301 | quiet_cmd_link_multi-m = LD [M] $@ | |
302 | cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps) | |
303 | ||
304 | # We would rather have a list of rules like | |
305 | # foo.o: $(foo-objs) | |
306 | # but that's not so easy, so we rather make all composite objects depend | |
307 | # on the set of all their parts | |
308 | $(multi-used-y) : %.o: $(multi-objs-y) FORCE | |
309 | $(call if_changed,link_multi-y) | |
310 | ||
311 | $(multi-used-m) : %.o: $(multi-objs-m) FORCE | |
312 | $(call if_changed,link_multi-m) | |
313 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) | |
314 | ||
315 | targets += $(multi-used-y) $(multi-used-m) | |
316 | ||
317 | ||
318 | # Descending | |
319 | # --------------------------------------------------------------------------- | |
320 | ||
4f193362 | 321 | PHONY += $(subdir-ym) |
1da177e4 LT |
322 | $(subdir-ym): |
323 | $(Q)$(MAKE) $(build)=$@ | |
324 | ||
325 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
326 | # --------------------------------------------------------------------------- | |
327 | ||
4f193362 | 328 | PHONY += FORCE |
1da177e4 LT |
329 | |
330 | FORCE: | |
331 | ||
332 | # Read all saved command lines and dependencies for the $(targets) we | |
333 | # may be building above, using $(if_changed{,_dep}). As an | |
334 | # optimization, we don't need to read them if the target does not | |
335 | # exist, we will rebuild anyway in that case. | |
336 | ||
337 | targets := $(wildcard $(sort $(targets))) | |
338 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) | |
339 | ||
340 | ifneq ($(cmd_files),) | |
341 | include $(cmd_files) | |
342 | endif | |
4f193362 PS |
343 | |
344 | ||
345 | # Declare the contents of the .PHONY variable as phony. We keep that | |
346 | # information in a variable se we can use it in if_changed and friends. | |
347 | ||
348 | .PHONY: $(PHONY) |