Contents of /tags/mkinitrd-6_3_0/busybox/scripts/Makefile.build
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Revision 1139 -
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Thu Aug 19 10:14:02 2010 UTC (14 years, 1 month ago) by niro
File size: 10407 byte(s)
Thu Aug 19 10:14:02 2010 UTC (14 years, 1 month ago) by niro
File size: 10407 byte(s)
tagged 'mkinitrd-6_3_0'
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 scripts/Kbuild.include |
14 | |
15 | # The filename Kbuild has precedence over Makefile |
16 | # bbox: we also try to include Kbuild file in obj tree first |
17 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) |
18 | include $(if $(wildcard $(src)/Kbuild), $(src)/Kbuild, \ |
19 | $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, \ |
20 | $(kbuild-dir)/Makefile \ |
21 | ) \ |
22 | ) |
23 | |
24 | include scripts/Makefile.lib |
25 | |
26 | ifdef host-progs |
27 | ifneq ($(hostprogs-y),$(host-progs)) |
28 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) |
29 | hostprogs-y += $(host-progs) |
30 | endif |
31 | endif |
32 | |
33 | # Do not include host rules unles needed |
34 | ifneq ($(hostprogs-y)$(hostprogs-m),) |
35 | include scripts/Makefile.host |
36 | endif |
37 | |
38 | ifneq ($(KBUILD_SRC),) |
39 | # Create output directory if not already present |
40 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) |
41 | |
42 | # Create directories for object files if directory does not exist |
43 | # Needed when obj-y := dir/file.o syntax is used |
44 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) |
45 | endif |
46 | |
47 | |
48 | ifdef EXTRA_TARGETS |
49 | $(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6. Please fix!) |
50 | endif |
51 | |
52 | ifdef build-targets |
53 | $(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6. Please fix!) |
54 | endif |
55 | |
56 | ifdef export-objs |
57 | $(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6. Please fix!) |
58 | endif |
59 | |
60 | ifdef O_TARGET |
61 | $(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6. Please fix!) |
62 | endif |
63 | |
64 | ifdef L_TARGET |
65 | $(error kbuild: $(obj)/Makefile - Use of L_TARGET is replaced by lib-y in 2.6. Please fix!) |
66 | endif |
67 | |
68 | ifdef list-multi |
69 | $(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6. Please fix!) |
70 | endif |
71 | |
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 |
125 | modname = $(*F) |
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) $@ |
137 | cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $< |
138 | |
139 | %.s: %.c FORCE |
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 | |
145 | %.i: %.c FORCE |
146 | $(call if_changed_dep,cc_i_c) |
147 | |
148 | # C (.c) files |
149 | # The C file is compiled and updated dependency information is generated. |
150 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) |
151 | |
152 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ |
153 | |
154 | ifndef CONFIG_MODVERSIONS |
155 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< |
156 | |
157 | else |
158 | # When module versioning is enabled the following steps are executed: |
159 | # o compile a .tmp_<file>.o from <file>.c |
160 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does |
161 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and |
162 | # are done. |
163 | # o otherwise, we calculate symbol versions using the good old |
164 | # genksyms on the preprocessed source and postprocess them in a way |
165 | # that they are usable as a linker script |
166 | # o generate <file>.o from .tmp_<file>.o using the linker to |
167 | # replace the unresolved symbols __crc_exported_symbol with |
168 | # the actual value of the checksum generated by genksyms |
169 | |
170 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< |
171 | cmd_modversions = \ |
172 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ |
173 | $(CPP) -D__GENKSYMS__ $(c_flags) $< \ |
174 | | $(GENKSYMS) -a $(ARCH) \ |
175 | > $(@D)/.tmp_$(@F:.o=.ver); \ |
176 | \ |
177 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ |
178 | -T $(@D)/.tmp_$(@F:.o=.ver); \ |
179 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ |
180 | else \ |
181 | mv -f $(@D)/.tmp_$(@F) $@; \ |
182 | fi; |
183 | endif |
184 | |
185 | define rule_cc_o_c |
186 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
187 | $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \ |
188 | $(cmd_modversions) \ |
189 | scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > $(@D)/.$(@F).tmp; \ |
190 | rm -f $(depfile); \ |
191 | mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd |
192 | endef |
193 | |
194 | # Built-in and composite module parts |
195 | |
196 | %.o: %.c FORCE |
197 | $(call cmd,force_checksrc) |
198 | $(call if_changed_rule,cc_o_c) |
199 | |
200 | # Single-part modules are special since we need to mark them in $(MODVERDIR) |
201 | |
202 | $(single-used-m): %.o: %.c FORCE |
203 | $(call cmd,force_checksrc) |
204 | $(call if_changed_rule,cc_o_c) |
205 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod) |
206 | |
207 | quiet_cmd_cc_lst_c = MKLST $@ |
208 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ |
209 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ |
210 | System.map $(OBJDUMP) > $@ |
211 | |
212 | %.lst: %.c FORCE |
213 | $(call if_changed_dep,cc_lst_c) |
214 | |
215 | # Compile assembler sources (.S) |
216 | # --------------------------------------------------------------------------- |
217 | |
218 | modkern_aflags := $(AFLAGS_KERNEL) |
219 | |
220 | $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE) |
221 | $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE) |
222 | |
223 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@ |
224 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $< |
225 | |
226 | %.s: %.S FORCE |
227 | $(call if_changed_dep,as_s_S) |
228 | |
229 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ |
230 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< |
231 | |
232 | %.o: %.S FORCE |
233 | $(call if_changed_dep,as_o_S) |
234 | |
235 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) |
236 | targets += $(extra-y) $(MAKECMDGOALS) $(always) |
237 | |
238 | # Linker scripts preprocessor (.lds.S -> .lds) |
239 | # --------------------------------------------------------------------------- |
240 | quiet_cmd_cpp_lds_S = LDS $@ |
241 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $< |
242 | |
243 | %.lds: %.lds.S FORCE |
244 | $(call if_changed_dep,cpp_lds_S) |
245 | |
246 | # Build the compiled-in targets |
247 | # --------------------------------------------------------------------------- |
248 | |
249 | # To build objects in subdirs, we need to descend into the directories |
250 | $(sort $(subdir-obj-y)): $(subdir-ym) ; |
251 | |
252 | # |
253 | # Rule to compile a set of .o files into one .o file |
254 | # |
255 | ifdef builtin-target |
256 | quiet_cmd_link_o_target = LD $@ |
257 | # If the list of objects to link is empty, just create an empty built-in.o |
258 | cmd_link_o_target = $(if $(strip $(obj-y)),\ |
259 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\ |
260 | rm -f $@; $(AR) rcs $@) |
261 | |
262 | $(builtin-target): $(obj-y) FORCE |
263 | $(call if_changed,link_o_target) |
264 | |
265 | targets += $(builtin-target) |
266 | endif # builtin-target |
267 | |
268 | # |
269 | # Rule to compile a set of .o files into one .a file |
270 | # |
271 | ifdef lib-target |
272 | quiet_cmd_link_l_target = AR $@ |
273 | cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y) |
274 | |
275 | $(lib-target): $(lib-y) FORCE |
276 | $(call if_changed,link_l_target) |
277 | |
278 | targets += $(lib-target) |
279 | endif |
280 | |
281 | # |
282 | # Rule to link composite objects |
283 | # |
284 | # Composite objects are specified in kbuild makefile as follows: |
285 | # <composite-object>-objs := <list of .o files> |
286 | # or |
287 | # <composite-object>-y := <list of .o files> |
288 | link_multi_deps = \ |
289 | $(filter $(addprefix $(obj)/, \ |
290 | $($(subst $(obj)/,,$(@:.o=-objs))) \ |
291 | $($(subst $(obj)/,,$(@:.o=-y)))), $^) |
292 | |
293 | quiet_cmd_link_multi-y = LD $@ |
294 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) |
295 | |
296 | quiet_cmd_link_multi-m = LD [M] $@ |
297 | cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps) |
298 | |
299 | # We would rather have a list of rules like |
300 | # foo.o: $(foo-objs) |
301 | # but that's not so easy, so we rather make all composite objects depend |
302 | # on the set of all their parts |
303 | $(multi-used-y) : %.o: $(multi-objs-y) FORCE |
304 | $(call if_changed,link_multi-y) |
305 | |
306 | $(multi-used-m) : %.o: $(multi-objs-m) FORCE |
307 | $(call if_changed,link_multi-m) |
308 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) |
309 | |
310 | targets += $(multi-used-y) $(multi-used-m) |
311 | |
312 | |
313 | # Descending |
314 | # --------------------------------------------------------------------------- |
315 | |
316 | PHONY += $(subdir-ym) |
317 | $(subdir-ym): |
318 | $(Q)$(MAKE) $(build)=$@ |
319 | |
320 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. |
321 | # --------------------------------------------------------------------------- |
322 | |
323 | PHONY += FORCE |
324 | |
325 | FORCE: |
326 | |
327 | # Read all saved command lines and dependencies for the $(targets) we |
328 | # may be building above, using $(if_changed{,_dep}). As an |
329 | # optimization, we don't need to read them if the target does not |
330 | # exist, we will rebuild anyway in that case. |
331 | |
332 | targets := $(wildcard $(sort $(targets))) |
333 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) |
334 | |
335 | ifneq ($(cmd_files),) |
336 | include $(cmd_files) |
337 | endif |
338 | |
339 | |
340 | # Declare the contents of the .PHONY variable as phony. We keep that |
341 | # information in a variable se we can use it in if_changed and friends. |
342 | |
343 | .PHONY: $(PHONY) |