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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | # ========================================================================== |
2 | # Building | |
3 | # ========================================================================== | |
4 | ||
5 | src := $(obj) | |
6 | ||
4f193362 | 7 | PHONY := __build |
1da177e4 LT |
8 | __build: |
9 | ||
d72e5edb SR |
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 | ||
1da177e4 | 26 | # Read .config if it exist, otherwise ignore |
c955ccaf | 27 | -include include/config/auto.conf |
1da177e4 | 28 | |
20a468b5 SR |
29 | include scripts/Kbuild.include |
30 | ||
0c53c8e6 SR |
31 | # For backward compatibility check that these variables does not change |
32 | save-cflags := $(CFLAGS) | |
33 | ||
2a691470 | 34 | # The filename Kbuild has precedence over Makefile |
db8c1a7b | 35 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) |
0c53c8e6 SR |
36 | kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) |
37 | include $(kbuild-file) | |
38 | ||
39 | # If the save-* variables changed error out | |
40 | ifeq ($(KBUILD_NOPEDANTIC),) | |
41 | ifneq ("$(save-cflags)","$(CFLAGS)") | |
42 | $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS) | |
43 | endif | |
44 | endif | |
1da177e4 LT |
45 | include scripts/Makefile.lib |
46 | ||
47 | ifdef host-progs | |
48 | ifneq ($(hostprogs-y),$(host-progs)) | |
49 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) | |
50 | hostprogs-y += $(host-progs) | |
51 | endif | |
52 | endif | |
53 | ||
54 | # Do not include host rules unles needed | |
55 | ifneq ($(hostprogs-y)$(hostprogs-m),) | |
56 | include scripts/Makefile.host | |
57 | endif | |
58 | ||
59 | ifneq ($(KBUILD_SRC),) | |
60 | # Create output directory if not already present | |
61 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) | |
62 | ||
63 | # Create directories for object files if directory does not exist | |
64 | # Needed when obj-y := dir/file.o syntax is used | |
65 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) | |
66 | endif | |
67 | ||
1da177e4 LT |
68 | ifndef obj |
69 | $(warning kbuild: Makefile.build is included improperly) | |
70 | endif | |
71 | ||
72 | # =========================================================================== | |
73 | ||
74 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),) | |
75 | lib-target := $(obj)/lib.a | |
76 | endif | |
77 | ||
78 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),) | |
79 | builtin-target := $(obj)/built-in.o | |
80 | endif | |
81 | ||
82 | # We keep a list of all modules in $(MODVERDIR) | |
83 | ||
84 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ | |
85 | $(if $(KBUILD_MODULES),$(obj-m)) \ | |
86 | $(subdir-ym) $(always) | |
87 | @: | |
88 | ||
89 | # Linus' kernel sanity checking tool | |
90 | ifneq ($(KBUILD_CHECKSRC),0) | |
91 | ifeq ($(KBUILD_CHECKSRC),2) | |
92 | quiet_cmd_force_checksrc = CHECK $< | |
93 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
94 | else | |
95 | quiet_cmd_checksrc = CHECK $< | |
96 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
97 | endif | |
98 | endif | |
99 | ||
100 | ||
101 | # Compile C sources (.c) | |
102 | # --------------------------------------------------------------------------- | |
103 | ||
104 | # Default is built-in, unless we know otherwise | |
105 | modkern_cflags := $(CFLAGS_KERNEL) | |
106 | quiet_modtag := $(empty) $(empty) | |
107 | ||
108 | $(real-objs-m) : modkern_cflags := $(CFLAGS_MODULE) | |
109 | $(real-objs-m:.o=.i) : modkern_cflags := $(CFLAGS_MODULE) | |
110 | $(real-objs-m:.o=.s) : modkern_cflags := $(CFLAGS_MODULE) | |
111 | $(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE) | |
112 | ||
113 | $(real-objs-m) : quiet_modtag := [M] | |
114 | $(real-objs-m:.o=.i) : quiet_modtag := [M] | |
115 | $(real-objs-m:.o=.s) : quiet_modtag := [M] | |
116 | $(real-objs-m:.o=.lst): quiet_modtag := [M] | |
117 | ||
118 | $(obj-m) : quiet_modtag := [M] | |
119 | ||
120 | # Default for not multi-part modules | |
5e8d780d | 121 | modname = $(basetarget) |
1da177e4 LT |
122 | |
123 | $(multi-objs-m) : modname = $(modname-multi) | |
124 | $(multi-objs-m:.o=.i) : modname = $(modname-multi) | |
125 | $(multi-objs-m:.o=.s) : modname = $(modname-multi) | |
126 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi) | |
127 | $(multi-objs-y) : modname = $(modname-multi) | |
128 | $(multi-objs-y:.o=.i) : modname = $(modname-multi) | |
129 | $(multi-objs-y:.o=.s) : modname = $(modname-multi) | |
130 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi) | |
131 | ||
132 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ | |
7d185983 | 133 | cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $< |
1da177e4 | 134 | |
767e581d | 135 | $(obj)/%.s: $(src)/%.c FORCE |
1da177e4 LT |
136 | $(call if_changed_dep,cc_s_c) |
137 | ||
138 | quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@ | |
139 | cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $< | |
140 | ||
767e581d | 141 | $(obj)/%.i: $(src)/%.c FORCE |
1da177e4 LT |
142 | $(call if_changed_dep,cc_i_c) |
143 | ||
15fde675 AG |
144 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ |
145 | cmd_cc_symtypes_c = \ | |
146 | $(CPP) -D__GENKSYMS__ $(c_flags) $< \ | |
147 | | $(GENKSYMS) -T $@ >/dev/null; \ | |
148 | test -s $@ || rm -f $@ | |
149 | ||
767e581d | 150 | $(obj)/%.symtypes : $(src)/%.c FORCE |
15fde675 AG |
151 | $(call if_changed_dep,cc_symtypes_c) |
152 | ||
1da177e4 LT |
153 | # C (.c) files |
154 | # The C file is compiled and updated dependency information is generated. | |
155 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) | |
156 | ||
157 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ | |
158 | ||
159 | ifndef CONFIG_MODVERSIONS | |
160 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< | |
161 | ||
162 | else | |
163 | # When module versioning is enabled the following steps are executed: | |
164 | # o compile a .tmp_<file>.o from <file>.c | |
165 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does | |
166 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and | |
167 | # are done. | |
168 | # o otherwise, we calculate symbol versions using the good old | |
169 | # genksyms on the preprocessed source and postprocess them in a way | |
170 | # that they are usable as a linker script | |
171 | # o generate <file>.o from .tmp_<file>.o using the linker to | |
172 | # replace the unresolved symbols __crc_exported_symbol with | |
173 | # the actual value of the checksum generated by genksyms | |
174 | ||
175 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< | |
176 | cmd_modversions = \ | |
177 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ | |
178 | $(CPP) -D__GENKSYMS__ $(c_flags) $< \ | |
15fde675 AG |
179 | | $(GENKSYMS) $(if $(KBUILD_SYMTYPES), \ |
180 | -T $(@D)/$(@F:.o=.symtypes)) -a $(ARCH) \ | |
1da177e4 LT |
181 | > $(@D)/.tmp_$(@F:.o=.ver); \ |
182 | \ | |
183 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ | |
184 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
185 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ | |
186 | else \ | |
cfca82f2 | 187 | mv -f $(@D)/.tmp_$(@F) $@; \ |
1da177e4 LT |
188 | fi; |
189 | endif | |
190 | ||
191 | define rule_cc_o_c | |
6176aa9a JB |
192 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
193 | $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \ | |
1da177e4 | 194 | $(cmd_modversions) \ |
48f1f058 SR |
195 | scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \ |
196 | $(dot-target).tmp; \ | |
1da177e4 | 197 | rm -f $(depfile); \ |
48f1f058 | 198 | mv -f $(dot-target).tmp $(dot-target).cmd |
1da177e4 LT |
199 | endef |
200 | ||
201 | # Built-in and composite module parts | |
767e581d | 202 | $(obj)/%.o: $(src)/%.c FORCE |
1da177e4 LT |
203 | $(call cmd,force_checksrc) |
204 | $(call if_changed_rule,cc_o_c) | |
205 | ||
206 | # Single-part modules are special since we need to mark them in $(MODVERDIR) | |
207 | ||
767e581d | 208 | $(single-used-m): $(obj)/%.o: $(src)/%.c FORCE |
1da177e4 LT |
209 | $(call cmd,force_checksrc) |
210 | $(call if_changed_rule,cc_o_c) | |
211 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod) | |
212 | ||
213 | quiet_cmd_cc_lst_c = MKLST $@ | |
214 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ | |
215 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ | |
216 | System.map $(OBJDUMP) > $@ | |
217 | ||
767e581d | 218 | $(obj)/%.lst: $(src)/%.c FORCE |
1da177e4 LT |
219 | $(call if_changed_dep,cc_lst_c) |
220 | ||
221 | # Compile assembler sources (.S) | |
222 | # --------------------------------------------------------------------------- | |
223 | ||
224 | modkern_aflags := $(AFLAGS_KERNEL) | |
225 | ||
226 | $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE) | |
227 | $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE) | |
228 | ||
229 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@ | |
230 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $< | |
231 | ||
767e581d | 232 | $(obj)/%.s: $(src)/%.S FORCE |
1da177e4 LT |
233 | $(call if_changed_dep,as_s_S) |
234 | ||
235 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ | |
236 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< | |
237 | ||
767e581d | 238 | $(obj)/%.o: $(src)/%.S FORCE |
1da177e4 LT |
239 | $(call if_changed_dep,as_o_S) |
240 | ||
241 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) | |
242 | targets += $(extra-y) $(MAKECMDGOALS) $(always) | |
243 | ||
244 | # Linker scripts preprocessor (.lds.S -> .lds) | |
245 | # --------------------------------------------------------------------------- | |
246 | quiet_cmd_cpp_lds_S = LDS $@ | |
247 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $< | |
248 | ||
767e581d | 249 | $(obj)/%.lds: $(src)/%.lds.S FORCE |
1da177e4 LT |
250 | $(call if_changed_dep,cpp_lds_S) |
251 | ||
252 | # Build the compiled-in targets | |
253 | # --------------------------------------------------------------------------- | |
254 | ||
255 | # To build objects in subdirs, we need to descend into the directories | |
256 | $(sort $(subdir-obj-y)): $(subdir-ym) ; | |
257 | ||
258 | # | |
259 | # Rule to compile a set of .o files into one .o file | |
260 | # | |
261 | ifdef builtin-target | |
262 | quiet_cmd_link_o_target = LD $@ | |
263 | # If the list of objects to link is empty, just create an empty built-in.o | |
264 | cmd_link_o_target = $(if $(strip $(obj-y)),\ | |
265 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\ | |
266 | rm -f $@; $(AR) rcs $@) | |
267 | ||
268 | $(builtin-target): $(obj-y) FORCE | |
269 | $(call if_changed,link_o_target) | |
270 | ||
271 | targets += $(builtin-target) | |
272 | endif # builtin-target | |
273 | ||
274 | # | |
275 | # Rule to compile a set of .o files into one .a file | |
276 | # | |
277 | ifdef lib-target | |
278 | quiet_cmd_link_l_target = AR $@ | |
5e54d5e5 | 279 | cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y) |
1da177e4 LT |
280 | |
281 | $(lib-target): $(lib-y) FORCE | |
282 | $(call if_changed,link_l_target) | |
283 | ||
284 | targets += $(lib-target) | |
285 | endif | |
286 | ||
287 | # | |
288 | # Rule to link composite objects | |
289 | # | |
290 | # Composite objects are specified in kbuild makefile as follows: | |
291 | # <composite-object>-objs := <list of .o files> | |
292 | # or | |
293 | # <composite-object>-y := <list of .o files> | |
294 | link_multi_deps = \ | |
295 | $(filter $(addprefix $(obj)/, \ | |
296 | $($(subst $(obj)/,,$(@:.o=-objs))) \ | |
297 | $($(subst $(obj)/,,$(@:.o=-y)))), $^) | |
298 | ||
299 | quiet_cmd_link_multi-y = LD $@ | |
300 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) | |
301 | ||
302 | quiet_cmd_link_multi-m = LD [M] $@ | |
114f5157 | 303 | cmd_link_multi-m = $(cmd_link_multi-y) |
1da177e4 LT |
304 | |
305 | # We would rather have a list of rules like | |
306 | # foo.o: $(foo-objs) | |
307 | # but that's not so easy, so we rather make all composite objects depend | |
308 | # on the set of all their parts | |
309 | $(multi-used-y) : %.o: $(multi-objs-y) FORCE | |
310 | $(call if_changed,link_multi-y) | |
311 | ||
312 | $(multi-used-m) : %.o: $(multi-objs-m) FORCE | |
313 | $(call if_changed,link_multi-m) | |
314 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) | |
315 | ||
316 | targets += $(multi-used-y) $(multi-used-m) | |
317 | ||
318 | ||
319 | # Descending | |
320 | # --------------------------------------------------------------------------- | |
321 | ||
4f193362 | 322 | PHONY += $(subdir-ym) |
1da177e4 LT |
323 | $(subdir-ym): |
324 | $(Q)$(MAKE) $(build)=$@ | |
325 | ||
326 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
327 | # --------------------------------------------------------------------------- | |
328 | ||
4f193362 | 329 | PHONY += FORCE |
1da177e4 LT |
330 | |
331 | FORCE: | |
332 | ||
333 | # Read all saved command lines and dependencies for the $(targets) we | |
334 | # may be building above, using $(if_changed{,_dep}). As an | |
335 | # optimization, we don't need to read them if the target does not | |
336 | # exist, we will rebuild anyway in that case. | |
337 | ||
338 | targets := $(wildcard $(sort $(targets))) | |
339 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) | |
340 | ||
341 | ifneq ($(cmd_files),) | |
342 | include $(cmd_files) | |
343 | endif | |
4f193362 PS |
344 | |
345 | ||
346 | # Declare the contents of the .PHONY variable as phony. We keep that | |
347 | # information in a variable se we can use it in if_changed and friends. | |
348 | ||
349 | .PHONY: $(PHONY) |