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40 | $(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6.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44 | $(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6.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48 | $(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6.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52 | $(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6.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60 | $(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6.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