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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 := | |
f77bf014 SR |
25 | asflags-y := |
26 | ccflags-y := | |
27 | cppflags-y := | |
28 | ldflags-y := | |
d72e5edb | 29 | |
1da177e4 | 30 | # Read .config if it exist, otherwise ignore |
c955ccaf | 31 | -include include/config/auto.conf |
1da177e4 | 32 | |
20a468b5 SR |
33 | include scripts/Kbuild.include |
34 | ||
0c53c8e6 SR |
35 | # For backward compatibility check that these variables does not change |
36 | save-cflags := $(CFLAGS) | |
37 | ||
2a691470 | 38 | # The filename Kbuild has precedence over Makefile |
db8c1a7b | 39 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) |
0c53c8e6 SR |
40 | kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) |
41 | include $(kbuild-file) | |
42 | ||
43 | # If the save-* variables changed error out | |
44 | ifeq ($(KBUILD_NOPEDANTIC),) | |
45 | ifneq ("$(save-cflags)","$(CFLAGS)") | |
46 | $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS) | |
47 | endif | |
48 | endif | |
1da177e4 LT |
49 | include scripts/Makefile.lib |
50 | ||
51 | ifdef host-progs | |
52 | ifneq ($(hostprogs-y),$(host-progs)) | |
53 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) | |
54 | hostprogs-y += $(host-progs) | |
55 | endif | |
56 | endif | |
57 | ||
58 | # Do not include host rules unles needed | |
59 | ifneq ($(hostprogs-y)$(hostprogs-m),) | |
60 | include scripts/Makefile.host | |
61 | endif | |
62 | ||
63 | ifneq ($(KBUILD_SRC),) | |
64 | # Create output directory if not already present | |
65 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) | |
66 | ||
67 | # Create directories for object files if directory does not exist | |
68 | # Needed when obj-y := dir/file.o syntax is used | |
69 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) | |
70 | endif | |
71 | ||
1da177e4 LT |
72 | ifndef obj |
73 | $(warning kbuild: Makefile.build is included improperly) | |
74 | endif | |
75 | ||
76 | # =========================================================================== | |
77 | ||
78 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),) | |
79 | lib-target := $(obj)/lib.a | |
80 | endif | |
81 | ||
82 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),) | |
83 | builtin-target := $(obj)/built-in.o | |
84 | endif | |
85 | ||
86 | # We keep a list of all modules in $(MODVERDIR) | |
87 | ||
88 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ | |
89 | $(if $(KBUILD_MODULES),$(obj-m)) \ | |
90 | $(subdir-ym) $(always) | |
91 | @: | |
92 | ||
93 | # Linus' kernel sanity checking tool | |
94 | ifneq ($(KBUILD_CHECKSRC),0) | |
95 | ifeq ($(KBUILD_CHECKSRC),2) | |
96 | quiet_cmd_force_checksrc = CHECK $< | |
97 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
98 | else | |
99 | quiet_cmd_checksrc = CHECK $< | |
100 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; | |
101 | endif | |
102 | endif | |
103 | ||
104 | ||
105 | # Compile C sources (.c) | |
106 | # --------------------------------------------------------------------------- | |
107 | ||
108 | # Default is built-in, unless we know otherwise | |
109 | modkern_cflags := $(CFLAGS_KERNEL) | |
110 | quiet_modtag := $(empty) $(empty) | |
111 | ||
112 | $(real-objs-m) : modkern_cflags := $(CFLAGS_MODULE) | |
113 | $(real-objs-m:.o=.i) : modkern_cflags := $(CFLAGS_MODULE) | |
114 | $(real-objs-m:.o=.s) : modkern_cflags := $(CFLAGS_MODULE) | |
115 | $(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE) | |
116 | ||
117 | $(real-objs-m) : quiet_modtag := [M] | |
118 | $(real-objs-m:.o=.i) : quiet_modtag := [M] | |
119 | $(real-objs-m:.o=.s) : quiet_modtag := [M] | |
120 | $(real-objs-m:.o=.lst): quiet_modtag := [M] | |
121 | ||
122 | $(obj-m) : quiet_modtag := [M] | |
123 | ||
124 | # Default for not multi-part modules | |
5e8d780d | 125 | modname = $(basetarget) |
1da177e4 LT |
126 | |
127 | $(multi-objs-m) : modname = $(modname-multi) | |
128 | $(multi-objs-m:.o=.i) : modname = $(modname-multi) | |
129 | $(multi-objs-m:.o=.s) : modname = $(modname-multi) | |
130 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi) | |
131 | $(multi-objs-y) : modname = $(modname-multi) | |
132 | $(multi-objs-y:.o=.i) : modname = $(modname-multi) | |
133 | $(multi-objs-y:.o=.s) : modname = $(modname-multi) | |
134 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi) | |
135 | ||
136 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ | |
7d185983 | 137 | cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $< |
1da177e4 | 138 | |
767e581d | 139 | $(obj)/%.s: $(src)/%.c FORCE |
1da177e4 LT |
140 | $(call if_changed_dep,cc_s_c) |
141 | ||
142 | quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@ | |
143 | cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $< | |
144 | ||
767e581d | 145 | $(obj)/%.i: $(src)/%.c FORCE |
1da177e4 LT |
146 | $(call if_changed_dep,cc_i_c) |
147 | ||
15fde675 AG |
148 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ |
149 | cmd_cc_symtypes_c = \ | |
150 | $(CPP) -D__GENKSYMS__ $(c_flags) $< \ | |
151 | | $(GENKSYMS) -T $@ >/dev/null; \ | |
152 | test -s $@ || rm -f $@ | |
153 | ||
767e581d | 154 | $(obj)/%.symtypes : $(src)/%.c FORCE |
15fde675 AG |
155 | $(call if_changed_dep,cc_symtypes_c) |
156 | ||
1da177e4 LT |
157 | # C (.c) files |
158 | # The C file is compiled and updated dependency information is generated. | |
159 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) | |
160 | ||
161 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ | |
162 | ||
163 | ifndef CONFIG_MODVERSIONS | |
164 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< | |
165 | ||
166 | else | |
167 | # When module versioning is enabled the following steps are executed: | |
168 | # o compile a .tmp_<file>.o from <file>.c | |
169 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does | |
170 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and | |
171 | # are done. | |
172 | # o otherwise, we calculate symbol versions using the good old | |
173 | # genksyms on the preprocessed source and postprocess them in a way | |
174 | # that they are usable as a linker script | |
175 | # o generate <file>.o from .tmp_<file>.o using the linker to | |
176 | # replace the unresolved symbols __crc_exported_symbol with | |
177 | # the actual value of the checksum generated by genksyms | |
178 | ||
179 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< | |
180 | cmd_modversions = \ | |
181 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ | |
182 | $(CPP) -D__GENKSYMS__ $(c_flags) $< \ | |
15fde675 AG |
183 | | $(GENKSYMS) $(if $(KBUILD_SYMTYPES), \ |
184 | -T $(@D)/$(@F:.o=.symtypes)) -a $(ARCH) \ | |
1da177e4 LT |
185 | > $(@D)/.tmp_$(@F:.o=.ver); \ |
186 | \ | |
187 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ | |
188 | -T $(@D)/.tmp_$(@F:.o=.ver); \ | |
189 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ | |
190 | else \ | |
cfca82f2 | 191 | mv -f $(@D)/.tmp_$(@F) $@; \ |
1da177e4 LT |
192 | fi; |
193 | endif | |
194 | ||
195 | define rule_cc_o_c | |
6176aa9a JB |
196 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
197 | $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \ | |
1da177e4 | 198 | $(cmd_modversions) \ |
48f1f058 SR |
199 | scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \ |
200 | $(dot-target).tmp; \ | |
1da177e4 | 201 | rm -f $(depfile); \ |
48f1f058 | 202 | mv -f $(dot-target).tmp $(dot-target).cmd |
1da177e4 LT |
203 | endef |
204 | ||
205 | # Built-in and composite module parts | |
767e581d | 206 | $(obj)/%.o: $(src)/%.c FORCE |
1da177e4 LT |
207 | $(call cmd,force_checksrc) |
208 | $(call if_changed_rule,cc_o_c) | |
209 | ||
210 | # Single-part modules are special since we need to mark them in $(MODVERDIR) | |
211 | ||
767e581d | 212 | $(single-used-m): $(obj)/%.o: $(src)/%.c FORCE |
1da177e4 LT |
213 | $(call cmd,force_checksrc) |
214 | $(call if_changed_rule,cc_o_c) | |
215 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod) | |
216 | ||
217 | quiet_cmd_cc_lst_c = MKLST $@ | |
218 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ | |
219 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ | |
220 | System.map $(OBJDUMP) > $@ | |
221 | ||
767e581d | 222 | $(obj)/%.lst: $(src)/%.c FORCE |
1da177e4 LT |
223 | $(call if_changed_dep,cc_lst_c) |
224 | ||
225 | # Compile assembler sources (.S) | |
226 | # --------------------------------------------------------------------------- | |
227 | ||
228 | modkern_aflags := $(AFLAGS_KERNEL) | |
229 | ||
230 | $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE) | |
231 | $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE) | |
232 | ||
233 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@ | |
234 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $< | |
235 | ||
767e581d | 236 | $(obj)/%.s: $(src)/%.S FORCE |
1da177e4 LT |
237 | $(call if_changed_dep,as_s_S) |
238 | ||
239 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ | |
240 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< | |
241 | ||
767e581d | 242 | $(obj)/%.o: $(src)/%.S FORCE |
1da177e4 LT |
243 | $(call if_changed_dep,as_o_S) |
244 | ||
245 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) | |
246 | targets += $(extra-y) $(MAKECMDGOALS) $(always) | |
247 | ||
248 | # Linker scripts preprocessor (.lds.S -> .lds) | |
249 | # --------------------------------------------------------------------------- | |
250 | quiet_cmd_cpp_lds_S = LDS $@ | |
251 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $< | |
252 | ||
767e581d | 253 | $(obj)/%.lds: $(src)/%.lds.S FORCE |
1da177e4 LT |
254 | $(call if_changed_dep,cpp_lds_S) |
255 | ||
256 | # Build the compiled-in targets | |
257 | # --------------------------------------------------------------------------- | |
258 | ||
259 | # To build objects in subdirs, we need to descend into the directories | |
260 | $(sort $(subdir-obj-y)): $(subdir-ym) ; | |
261 | ||
262 | # | |
263 | # Rule to compile a set of .o files into one .o file | |
264 | # | |
265 | ifdef builtin-target | |
266 | quiet_cmd_link_o_target = LD $@ | |
267 | # If the list of objects to link is empty, just create an empty built-in.o | |
268 | cmd_link_o_target = $(if $(strip $(obj-y)),\ | |
269 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\ | |
270 | rm -f $@; $(AR) rcs $@) | |
271 | ||
272 | $(builtin-target): $(obj-y) FORCE | |
273 | $(call if_changed,link_o_target) | |
274 | ||
275 | targets += $(builtin-target) | |
276 | endif # builtin-target | |
277 | ||
278 | # | |
279 | # Rule to compile a set of .o files into one .a file | |
280 | # | |
281 | ifdef lib-target | |
282 | quiet_cmd_link_l_target = AR $@ | |
5e54d5e5 | 283 | cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y) |
1da177e4 LT |
284 | |
285 | $(lib-target): $(lib-y) FORCE | |
286 | $(call if_changed,link_l_target) | |
287 | ||
288 | targets += $(lib-target) | |
289 | endif | |
290 | ||
291 | # | |
292 | # Rule to link composite objects | |
293 | # | |
294 | # Composite objects are specified in kbuild makefile as follows: | |
295 | # <composite-object>-objs := <list of .o files> | |
296 | # or | |
297 | # <composite-object>-y := <list of .o files> | |
298 | link_multi_deps = \ | |
299 | $(filter $(addprefix $(obj)/, \ | |
300 | $($(subst $(obj)/,,$(@:.o=-objs))) \ | |
301 | $($(subst $(obj)/,,$(@:.o=-y)))), $^) | |
302 | ||
303 | quiet_cmd_link_multi-y = LD $@ | |
304 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) | |
305 | ||
306 | quiet_cmd_link_multi-m = LD [M] $@ | |
114f5157 | 307 | cmd_link_multi-m = $(cmd_link_multi-y) |
1da177e4 LT |
308 | |
309 | # We would rather have a list of rules like | |
310 | # foo.o: $(foo-objs) | |
311 | # but that's not so easy, so we rather make all composite objects depend | |
312 | # on the set of all their parts | |
313 | $(multi-used-y) : %.o: $(multi-objs-y) FORCE | |
314 | $(call if_changed,link_multi-y) | |
315 | ||
316 | $(multi-used-m) : %.o: $(multi-objs-m) FORCE | |
317 | $(call if_changed,link_multi-m) | |
318 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) | |
319 | ||
320 | targets += $(multi-used-y) $(multi-used-m) | |
321 | ||
322 | ||
323 | # Descending | |
324 | # --------------------------------------------------------------------------- | |
325 | ||
4f193362 | 326 | PHONY += $(subdir-ym) |
1da177e4 LT |
327 | $(subdir-ym): |
328 | $(Q)$(MAKE) $(build)=$@ | |
329 | ||
330 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. | |
331 | # --------------------------------------------------------------------------- | |
332 | ||
4f193362 | 333 | PHONY += FORCE |
1da177e4 LT |
334 | |
335 | FORCE: | |
336 | ||
337 | # Read all saved command lines and dependencies for the $(targets) we | |
338 | # may be building above, using $(if_changed{,_dep}). As an | |
339 | # optimization, we don't need to read them if the target does not | |
340 | # exist, we will rebuild anyway in that case. | |
341 | ||
342 | targets := $(wildcard $(sort $(targets))) | |
343 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) | |
344 | ||
345 | ifneq ($(cmd_files),) | |
346 | include $(cmd_files) | |
347 | endif | |
4f193362 PS |
348 | |
349 | ||
350 | # Declare the contents of the .PHONY variable as phony. We keep that | |
351 | # information in a variable se we can use it in if_changed and friends. | |
352 | ||
353 | .PHONY: $(PHONY) |