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 | |
11 | -include .config | |
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44 | $(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6.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48 | $(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6.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52 | $(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6.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56 | $(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6.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64 | $(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6.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 | |
120 | modname = $(*F) | |
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) $@ | |
132 | cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $< | |
133 | ||
134 | %.s: %.c FORCE | |
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 | ||
140 | %.i: %.c FORCE | |
141 | $(call if_changed_dep,cc_i_c) | |
142 | ||
143 | # C (.c) files | |
144 | # The C file is compiled and updated dependency information is generated. | |
145 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) | |
146 | ||
147 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ | |
148 | ||
149 | ifndef CONFIG_MODVERSIONS | |
150 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< | |
151 | ||
152 | else | |
153 | # When module versioning is enabled the following steps are executed: | |
154 | # o compile a .tmp_<file>.o from <file>.c | |
155 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does | |
156 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and | |
157 | # are done. | |
158 | # o otherwise, we calculate symbol versions using the good old | |
159 | # genksyms on the preprocessed source and postprocess them in a way | |
160 | # that they are usable as a linker script | |
161 | # o generate <file>.o from .tmp_<file>.o using the linker to | |
162 | # replace the unresolved symbols __crc_exported_symbol with | |
163 | # the actual value of the checksum generated by genksyms | |
164 | ||
165 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< | |
166 | cmd_modversions = \ | |
167 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ | |
168 | $(CPP) -D__GENKSYMS__ $(c_flags) $< \ | |
169 | | $(GENKSYMS) \ | |
170 | > $(@D)/.tmp_$(@F:.o=.ver); \ | |
171 | \ | |
172 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ | |
173 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
174 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ | |
175 | else \ | |
cfca82f2 | 176 | mv -f $(@D)/.tmp_$(@F) $@; \ |
1da177e4 LT |
177 | fi; |
178 | endif | |
179 | ||
180 | define rule_cc_o_c | |
6176aa9a JB |
181 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
182 | $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \ | |
1da177e4 | 183 | $(cmd_modversions) \ |
6176aa9a | 184 | scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > $(@D)/.$(@F).tmp; \ |
1da177e4 LT |
185 | rm -f $(depfile); \ |
186 | mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd | |
187 | endef | |
188 | ||
189 | # Built-in and composite module parts | |
190 | ||
191 | %.o: %.c FORCE | |
192 | $(call cmd,force_checksrc) | |
193 | $(call if_changed_rule,cc_o_c) | |
194 | ||
195 | # Single-part modules are special since we need to mark them in $(MODVERDIR) | |
196 | ||
197 | $(single-used-m): %.o: %.c FORCE | |
198 | $(call cmd,force_checksrc) | |
199 | $(call if_changed_rule,cc_o_c) | |
200 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod) | |
201 | ||
202 | quiet_cmd_cc_lst_c = MKLST $@ | |
203 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ | |
204 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ | |
205 | System.map $(OBJDUMP) > $@ | |
206 | ||
207 | %.lst: %.c FORCE | |
208 | $(call if_changed_dep,cc_lst_c) | |
209 | ||
210 | # Compile assembler sources (.S) | |
211 | # --------------------------------------------------------------------------- | |
212 | ||
213 | modkern_aflags := $(AFLAGS_KERNEL) | |
214 | ||
215 | $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE) | |
216 | $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE) | |
217 | ||
218 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@ | |
219 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $< | |
220 | ||
221 | %.s: %.S FORCE | |
222 | $(call if_changed_dep,as_s_S) | |
223 | ||
224 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ | |
225 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< | |
226 | ||
227 | %.o: %.S FORCE | |
228 | $(call if_changed_dep,as_o_S) | |
229 | ||
230 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) | |
231 | targets += $(extra-y) $(MAKECMDGOALS) $(always) | |
232 | ||
233 | # Linker scripts preprocessor (.lds.S -> .lds) | |
234 | # --------------------------------------------------------------------------- | |
235 | quiet_cmd_cpp_lds_S = LDS $@ | |
236 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $< | |
237 | ||
238 | %.lds: %.lds.S FORCE | |
239 | $(call if_changed_dep,cpp_lds_S) | |
240 | ||
241 | # Build the compiled-in targets | |
242 | # --------------------------------------------------------------------------- | |
243 | ||
244 | # To build objects in subdirs, we need to descend into the directories | |
245 | $(sort $(subdir-obj-y)): $(subdir-ym) ; | |
246 | ||
247 | # | |
248 | # Rule to compile a set of .o files into one .o file | |
249 | # | |
250 | ifdef builtin-target | |
251 | quiet_cmd_link_o_target = LD $@ | |
252 | # If the list of objects to link is empty, just create an empty built-in.o | |
253 | cmd_link_o_target = $(if $(strip $(obj-y)),\ | |
254 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\ | |
255 | rm -f $@; $(AR) rcs $@) | |
256 | ||
257 | $(builtin-target): $(obj-y) FORCE | |
258 | $(call if_changed,link_o_target) | |
259 | ||
260 | targets += $(builtin-target) | |
261 | endif # builtin-target | |
262 | ||
263 | # | |
264 | # Rule to compile a set of .o files into one .a file | |
265 | # | |
266 | ifdef lib-target | |
267 | quiet_cmd_link_l_target = AR $@ | |
268 | cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y) | |
269 | ||
270 | $(lib-target): $(lib-y) FORCE | |
271 | $(call if_changed,link_l_target) | |
272 | ||
273 | targets += $(lib-target) | |
274 | endif | |
275 | ||
276 | # | |
277 | # Rule to link composite objects | |
278 | # | |
279 | # Composite objects are specified in kbuild makefile as follows: | |
280 | # <composite-object>-objs := <list of .o files> | |
281 | # or | |
282 | # <composite-object>-y := <list of .o files> | |
283 | link_multi_deps = \ | |
284 | $(filter $(addprefix $(obj)/, \ | |
285 | $($(subst $(obj)/,,$(@:.o=-objs))) \ | |
286 | $($(subst $(obj)/,,$(@:.o=-y)))), $^) | |
287 | ||
288 | quiet_cmd_link_multi-y = LD $@ | |
289 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) | |
290 | ||
291 | quiet_cmd_link_multi-m = LD [M] $@ | |
292 | cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps) | |
293 | ||
294 | # We would rather have a list of rules like | |
295 | # foo.o: $(foo-objs) | |
296 | # but that's not so easy, so we rather make all composite objects depend | |
297 | # on the set of all their parts | |
298 | $(multi-used-y) : %.o: $(multi-objs-y) FORCE | |
299 | $(call if_changed,link_multi-y) | |
300 | ||
301 | $(multi-used-m) : %.o: $(multi-objs-m) FORCE | |
302 | $(call if_changed,link_multi-m) | |
303 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) | |
304 | ||
305 | targets += $(multi-used-y) $(multi-used-m) | |
306 | ||
307 | ||
308 | # Descending | |
309 | # --------------------------------------------------------------------------- | |
310 | ||
4f193362 | 311 | PHONY += $(subdir-ym) |
1da177e4 LT |
312 | $(subdir-ym): |
313 | $(Q)$(MAKE) $(build)=$@ | |
314 | ||
315 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
316 | # --------------------------------------------------------------------------- | |
317 | ||
4f193362 | 318 | PHONY += FORCE |
1da177e4 LT |
319 | |
320 | FORCE: | |
321 | ||
322 | # Read all saved command lines and dependencies for the $(targets) we | |
323 | # may be building above, using $(if_changed{,_dep}). As an | |
324 | # optimization, we don't need to read them if the target does not | |
325 | # exist, we will rebuild anyway in that case. | |
326 | ||
327 | targets := $(wildcard $(sort $(targets))) | |
328 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) | |
329 | ||
330 | ifneq ($(cmd_files),) | |
331 | include $(cmd_files) | |
332 | endif | |
4f193362 PS |
333 | |
334 | ||
335 | # Declare the contents of the .PHONY variable as phony. We keep that | |
336 | # information in a variable se we can use it in if_changed and friends. | |
337 | ||
338 | .PHONY: $(PHONY) |