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 | ||
2a691470 | 13 | # The filename Kbuild has precedence over Makefile |
db8c1a7b SR |
14 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) |
15 | include $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, $(kbuild-dir)/Makefile) | |
1da177e4 | 16 | |
8ec4b4ff | 17 | include scripts/Kbuild.include |
1da177e4 LT |
18 | include scripts/Makefile.lib |
19 | ||
20 | ifdef host-progs | |
21 | ifneq ($(hostprogs-y),$(host-progs)) | |
22 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) | |
23 | hostprogs-y += $(host-progs) | |
24 | endif | |
25 | endif | |
26 | ||
27 | # Do not include host rules unles needed | |
28 | ifneq ($(hostprogs-y)$(hostprogs-m),) | |
29 | include scripts/Makefile.host | |
30 | endif | |
31 | ||
32 | ifneq ($(KBUILD_SRC),) | |
33 | # Create output directory if not already present | |
34 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) | |
35 | ||
36 | # Create directories for object files if directory does not exist | |
37 | # Needed when obj-y := dir/file.o syntax is used | |
38 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) | |
39 | endif | |
40 | ||
41 | ||
42 | ifdef EXTRA_TARGETS | |
43 | $(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6. Please fix!) | |
44 | endif | |
45 | ||
46 | ifdef build-targets | |
47 | $(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6. Please fix!) | |
48 | endif | |
49 | ||
50 | ifdef export-objs | |
51 | $(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6. Please fix!) | |
52 | endif | |
53 | ||
54 | ifdef O_TARGET | |
55 | $(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6. Please fix!) | |
56 | endif | |
57 | ||
58 | ifdef L_TARGET | |
59 | $(error kbuild: $(obj)/Makefile - Use of L_TARGET is replaced by lib-y in 2.6. Please fix!) | |
60 | endif | |
61 | ||
62 | ifdef list-multi | |
63 | $(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6. Please fix!) | |
64 | endif | |
65 | ||
66 | ifndef obj | |
67 | $(warning kbuild: Makefile.build is included improperly) | |
68 | endif | |
69 | ||
70 | # =========================================================================== | |
71 | ||
72 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),) | |
73 | lib-target := $(obj)/lib.a | |
74 | endif | |
75 | ||
76 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),) | |
77 | builtin-target := $(obj)/built-in.o | |
78 | endif | |
79 | ||
80 | # We keep a list of all modules in $(MODVERDIR) | |
81 | ||
82 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ | |
83 | $(if $(KBUILD_MODULES),$(obj-m)) \ | |
84 | $(subdir-ym) $(always) | |
85 | @: | |
86 | ||
87 | # Linus' kernel sanity checking tool | |
88 | ifneq ($(KBUILD_CHECKSRC),0) | |
89 | ifeq ($(KBUILD_CHECKSRC),2) | |
90 | quiet_cmd_force_checksrc = CHECK $< | |
91 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
92 | else | |
93 | quiet_cmd_checksrc = CHECK $< | |
94 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
95 | endif | |
96 | endif | |
97 | ||
98 | ||
99 | # Compile C sources (.c) | |
100 | # --------------------------------------------------------------------------- | |
101 | ||
102 | # Default is built-in, unless we know otherwise | |
103 | modkern_cflags := $(CFLAGS_KERNEL) | |
104 | quiet_modtag := $(empty) $(empty) | |
105 | ||
106 | $(real-objs-m) : modkern_cflags := $(CFLAGS_MODULE) | |
107 | $(real-objs-m:.o=.i) : modkern_cflags := $(CFLAGS_MODULE) | |
108 | $(real-objs-m:.o=.s) : modkern_cflags := $(CFLAGS_MODULE) | |
109 | $(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE) | |
110 | ||
111 | $(real-objs-m) : quiet_modtag := [M] | |
112 | $(real-objs-m:.o=.i) : quiet_modtag := [M] | |
113 | $(real-objs-m:.o=.s) : quiet_modtag := [M] | |
114 | $(real-objs-m:.o=.lst): quiet_modtag := [M] | |
115 | ||
116 | $(obj-m) : quiet_modtag := [M] | |
117 | ||
118 | # Default for not multi-part modules | |
119 | modname = $(*F) | |
120 | ||
121 | $(multi-objs-m) : modname = $(modname-multi) | |
122 | $(multi-objs-m:.o=.i) : modname = $(modname-multi) | |
123 | $(multi-objs-m:.o=.s) : modname = $(modname-multi) | |
124 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi) | |
125 | $(multi-objs-y) : modname = $(modname-multi) | |
126 | $(multi-objs-y:.o=.i) : modname = $(modname-multi) | |
127 | $(multi-objs-y:.o=.s) : modname = $(modname-multi) | |
128 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi) | |
129 | ||
130 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ | |
131 | cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $< | |
132 | ||
133 | %.s: %.c FORCE | |
134 | $(call if_changed_dep,cc_s_c) | |
135 | ||
136 | quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@ | |
137 | cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $< | |
138 | ||
139 | %.i: %.c FORCE | |
140 | $(call if_changed_dep,cc_i_c) | |
141 | ||
142 | # C (.c) files | |
143 | # The C file is compiled and updated dependency information is generated. | |
144 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) | |
145 | ||
146 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ | |
147 | ||
148 | ifndef CONFIG_MODVERSIONS | |
149 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< | |
150 | ||
151 | else | |
152 | # When module versioning is enabled the following steps are executed: | |
153 | # o compile a .tmp_<file>.o from <file>.c | |
154 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does | |
155 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and | |
156 | # are done. | |
157 | # o otherwise, we calculate symbol versions using the good old | |
158 | # genksyms on the preprocessed source and postprocess them in a way | |
159 | # that they are usable as a linker script | |
160 | # o generate <file>.o from .tmp_<file>.o using the linker to | |
161 | # replace the unresolved symbols __crc_exported_symbol with | |
162 | # the actual value of the checksum generated by genksyms | |
163 | ||
164 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< | |
165 | cmd_modversions = \ | |
166 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ | |
167 | $(CPP) -D__GENKSYMS__ $(c_flags) $< \ | |
168 | | $(GENKSYMS) \ | |
169 | > $(@D)/.tmp_$(@F:.o=.ver); \ | |
170 | \ | |
171 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ | |
172 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
173 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ | |
174 | else \ | |
cfca82f2 | 175 | mv -f $(@D)/.tmp_$(@F) $@; \ |
1da177e4 LT |
176 | fi; |
177 | endif | |
178 | ||
179 | define rule_cc_o_c | |
180 | $(if $($(quiet)cmd_checksrc),echo ' $($(quiet)cmd_checksrc)';) \ | |
181 | $(cmd_checksrc) \ | |
8476994a | 182 | $(if $($(quiet)cmd_cc_o_c),echo ' $(subst ','\'',$($(quiet)cmd_cc_o_c))';) \ |
1da177e4 LT |
183 | $(cmd_cc_o_c); \ |
184 | $(cmd_modversions) \ | |
8476994a | 185 | scripts/basic/fixdep $(depfile) $@ '$(subst ','\'',$(cmd_cc_o_c))' > $(@D)/.$(@F).tmp; \ |
1da177e4 LT |
186 | rm -f $(depfile); \ |
187 | mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd | |
188 | endef | |
189 | ||
190 | # Built-in and composite module parts | |
191 | ||
192 | %.o: %.c FORCE | |
193 | $(call cmd,force_checksrc) | |
194 | $(call if_changed_rule,cc_o_c) | |
195 | ||
196 | # Single-part modules are special since we need to mark them in $(MODVERDIR) | |
197 | ||
198 | $(single-used-m): %.o: %.c FORCE | |
199 | $(call cmd,force_checksrc) | |
200 | $(call if_changed_rule,cc_o_c) | |
201 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod) | |
202 | ||
203 | quiet_cmd_cc_lst_c = MKLST $@ | |
204 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ | |
205 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ | |
206 | System.map $(OBJDUMP) > $@ | |
207 | ||
208 | %.lst: %.c FORCE | |
209 | $(call if_changed_dep,cc_lst_c) | |
210 | ||
211 | # Compile assembler sources (.S) | |
212 | # --------------------------------------------------------------------------- | |
213 | ||
214 | modkern_aflags := $(AFLAGS_KERNEL) | |
215 | ||
216 | $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE) | |
217 | $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE) | |
218 | ||
219 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@ | |
220 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $< | |
221 | ||
222 | %.s: %.S FORCE | |
223 | $(call if_changed_dep,as_s_S) | |
224 | ||
225 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ | |
226 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< | |
227 | ||
228 | %.o: %.S FORCE | |
229 | $(call if_changed_dep,as_o_S) | |
230 | ||
231 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) | |
232 | targets += $(extra-y) $(MAKECMDGOALS) $(always) | |
233 | ||
234 | # Linker scripts preprocessor (.lds.S -> .lds) | |
235 | # --------------------------------------------------------------------------- | |
236 | quiet_cmd_cpp_lds_S = LDS $@ | |
237 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $< | |
238 | ||
239 | %.lds: %.lds.S FORCE | |
240 | $(call if_changed_dep,cpp_lds_S) | |
241 | ||
242 | # Build the compiled-in targets | |
243 | # --------------------------------------------------------------------------- | |
244 | ||
245 | # To build objects in subdirs, we need to descend into the directories | |
246 | $(sort $(subdir-obj-y)): $(subdir-ym) ; | |
247 | ||
248 | # | |
249 | # Rule to compile a set of .o files into one .o file | |
250 | # | |
251 | ifdef builtin-target | |
252 | quiet_cmd_link_o_target = LD $@ | |
253 | # If the list of objects to link is empty, just create an empty built-in.o | |
254 | cmd_link_o_target = $(if $(strip $(obj-y)),\ | |
255 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\ | |
256 | rm -f $@; $(AR) rcs $@) | |
257 | ||
258 | $(builtin-target): $(obj-y) FORCE | |
259 | $(call if_changed,link_o_target) | |
260 | ||
261 | targets += $(builtin-target) | |
262 | endif # builtin-target | |
263 | ||
264 | # | |
265 | # Rule to compile a set of .o files into one .a file | |
266 | # | |
267 | ifdef lib-target | |
268 | quiet_cmd_link_l_target = AR $@ | |
269 | cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y) | |
270 | ||
271 | $(lib-target): $(lib-y) FORCE | |
272 | $(call if_changed,link_l_target) | |
273 | ||
274 | targets += $(lib-target) | |
275 | endif | |
276 | ||
277 | # | |
278 | # Rule to link composite objects | |
279 | # | |
280 | # Composite objects are specified in kbuild makefile as follows: | |
281 | # <composite-object>-objs := <list of .o files> | |
282 | # or | |
283 | # <composite-object>-y := <list of .o files> | |
284 | link_multi_deps = \ | |
285 | $(filter $(addprefix $(obj)/, \ | |
286 | $($(subst $(obj)/,,$(@:.o=-objs))) \ | |
287 | $($(subst $(obj)/,,$(@:.o=-y)))), $^) | |
288 | ||
289 | quiet_cmd_link_multi-y = LD $@ | |
290 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) | |
291 | ||
292 | quiet_cmd_link_multi-m = LD [M] $@ | |
293 | cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps) | |
294 | ||
295 | # We would rather have a list of rules like | |
296 | # foo.o: $(foo-objs) | |
297 | # but that's not so easy, so we rather make all composite objects depend | |
298 | # on the set of all their parts | |
299 | $(multi-used-y) : %.o: $(multi-objs-y) FORCE | |
300 | $(call if_changed,link_multi-y) | |
301 | ||
302 | $(multi-used-m) : %.o: $(multi-objs-m) FORCE | |
303 | $(call if_changed,link_multi-m) | |
304 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) | |
305 | ||
306 | targets += $(multi-used-y) $(multi-used-m) | |
307 | ||
308 | ||
309 | # Descending | |
310 | # --------------------------------------------------------------------------- | |
311 | ||
312 | .PHONY: $(subdir-ym) | |
313 | $(subdir-ym): | |
314 | $(Q)$(MAKE) $(build)=$@ | |
315 | ||
316 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
317 | # --------------------------------------------------------------------------- | |
318 | ||
319 | .PHONY: FORCE | |
320 | ||
321 | FORCE: | |
322 | ||
323 | # Read all saved command lines and dependencies for the $(targets) we | |
324 | # may be building above, using $(if_changed{,_dep}). As an | |
325 | # optimization, we don't need to read them if the target does not | |
326 | # exist, we will rebuild anyway in that case. | |
327 | ||
328 | targets := $(wildcard $(sort $(targets))) | |
329 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) | |
330 | ||
331 | ifneq ($(cmd_files),) | |
332 | include $(cmd_files) | |
333 | endif |