Contents of /tags/mkinitrd-6_1_2/busybox/scripts/Makefile.build
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Mon May 4 17:23:09 2009 UTC (15 years, 4 months ago) by niro
File size: 10280 byte(s)
Mon May 4 17:23:09 2009 UTC (15 years, 4 months ago) by niro
File size: 10280 byte(s)
tagged 'mkinitrd-6_1_2'
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 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) |
17 | include $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, $(kbuild-dir)/Makefile) |
18 | |
19 | include scripts/Makefile.lib |
20 | |
21 | ifdef host-progs |
22 | ifneq ($(hostprogs-y),$(host-progs)) |
23 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) |
24 | hostprogs-y += $(host-progs) |
25 | endif |
26 | endif |
27 | |
28 | # Do not include host rules unles needed |
29 | ifneq ($(hostprogs-y)$(hostprogs-m),) |
30 | include scripts/Makefile.host |
31 | endif |
32 | |
33 | ifneq ($(KBUILD_SRC),) |
34 | # Create output directory if not already present |
35 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) |
36 | |
37 | # Create directories for object files if directory does not exist |
38 | # Needed when obj-y := dir/file.o syntax is used |
39 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) |
40 | endif |
41 | |
42 | |
43 | ifdef EXTRA_TARGETS |
44 | $(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6. Please fix!) |
45 | endif |
46 | |
47 | ifdef build-targets |
48 | $(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6. Please fix!) |
49 | endif |
50 | |
51 | ifdef export-objs |
52 | $(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6. Please fix!) |
53 | endif |
54 | |
55 | ifdef O_TARGET |
56 | $(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6. Please fix!) |
57 | endif |
58 | |
59 | ifdef L_TARGET |
60 | $(error kbuild: $(obj)/Makefile - Use of L_TARGET is replaced by lib-y in 2.6. Please fix!) |
61 | endif |
62 | |
63 | ifdef list-multi |
64 | $(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6. Please fix!) |
65 | endif |
66 | |
67 | ifndef obj |
68 | $(warning kbuild: Makefile.build is included improperly) |
69 | endif |
70 | |
71 | # =========================================================================== |
72 | |
73 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),) |
74 | lib-target := $(obj)/lib.a |
75 | endif |
76 | |
77 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),) |
78 | builtin-target := $(obj)/built-in.o |
79 | endif |
80 | |
81 | # We keep a list of all modules in $(MODVERDIR) |
82 | |
83 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ |
84 | $(if $(KBUILD_MODULES),$(obj-m)) \ |
85 | $(subdir-ym) $(always) |
86 | @: |
87 | |
88 | # Linus' kernel sanity checking tool |
89 | ifneq ($(KBUILD_CHECKSRC),0) |
90 | ifeq ($(KBUILD_CHECKSRC),2) |
91 | quiet_cmd_force_checksrc = CHECK $< |
92 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; |
93 | else |
94 | quiet_cmd_checksrc = CHECK $< |
95 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; |
96 | endif |
97 | endif |
98 | |
99 | |
100 | # Compile C sources (.c) |
101 | # --------------------------------------------------------------------------- |
102 | |
103 | # Default is built-in, unless we know otherwise |
104 | modkern_cflags := $(CFLAGS_KERNEL) |
105 | quiet_modtag := $(empty) $(empty) |
106 | |
107 | $(real-objs-m) : modkern_cflags := $(CFLAGS_MODULE) |
108 | $(real-objs-m:.o=.i) : modkern_cflags := $(CFLAGS_MODULE) |
109 | $(real-objs-m:.o=.s) : modkern_cflags := $(CFLAGS_MODULE) |
110 | $(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE) |
111 | |
112 | $(real-objs-m) : quiet_modtag := [M] |
113 | $(real-objs-m:.o=.i) : quiet_modtag := [M] |
114 | $(real-objs-m:.o=.s) : quiet_modtag := [M] |
115 | $(real-objs-m:.o=.lst): quiet_modtag := [M] |
116 | |
117 | $(obj-m) : quiet_modtag := [M] |
118 | |
119 | # Default for not multi-part modules |
120 | modname = $(*F) |
121 | |
122 | $(multi-objs-m) : modname = $(modname-multi) |
123 | $(multi-objs-m:.o=.i) : modname = $(modname-multi) |
124 | $(multi-objs-m:.o=.s) : modname = $(modname-multi) |
125 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi) |
126 | $(multi-objs-y) : modname = $(modname-multi) |
127 | $(multi-objs-y:.o=.i) : modname = $(modname-multi) |
128 | $(multi-objs-y:.o=.s) : modname = $(modname-multi) |
129 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi) |
130 | |
131 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ |
132 | cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $< |
133 | |
134 | %.s: %.c FORCE |
135 | $(call if_changed_dep,cc_s_c) |
136 | |
137 | quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@ |
138 | cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $< |
139 | |
140 | %.i: %.c FORCE |
141 | $(call if_changed_dep,cc_i_c) |
142 | |
143 | # C (.c) files |
144 | # The C file is compiled and updated dependency information is generated. |
145 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) |
146 | |
147 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ |
148 | |
149 | ifndef CONFIG_MODVERSIONS |
150 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< |
151 | |
152 | else |
153 | # When module versioning is enabled the following steps are executed: |
154 | # o compile a .tmp_<file>.o from <file>.c |
155 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does |
156 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and |
157 | # are done. |
158 | # o otherwise, we calculate symbol versions using the good old |
159 | # genksyms on the preprocessed source and postprocess them in a way |
160 | # that they are usable as a linker script |
161 | # o generate <file>.o from .tmp_<file>.o using the linker to |
162 | # replace the unresolved symbols __crc_exported_symbol with |
163 | # the actual value of the checksum generated by genksyms |
164 | |
165 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< |
166 | cmd_modversions = \ |
167 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ |
168 | $(CPP) -D__GENKSYMS__ $(c_flags) $< \ |
169 | | $(GENKSYMS) -a $(ARCH) \ |
170 | > $(@D)/.tmp_$(@F:.o=.ver); \ |
171 | \ |
172 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ |
173 | -T $(@D)/.tmp_$(@F:.o=.ver); \ |
174 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ |
175 | else \ |
176 | mv -f $(@D)/.tmp_$(@F) $@; \ |
177 | fi; |
178 | endif |
179 | |
180 | define rule_cc_o_c |
181 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
182 | $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \ |
183 | $(cmd_modversions) \ |
184 | scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > $(@D)/.$(@F).tmp; \ |
185 | rm -f $(depfile); \ |
186 | mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd |
187 | endef |
188 | |
189 | # Built-in and composite module parts |
190 | |
191 | %.o: %.c FORCE |
192 | $(call cmd,force_checksrc) |
193 | $(call if_changed_rule,cc_o_c) |
194 | |
195 | # Single-part modules are special since we need to mark them in $(MODVERDIR) |
196 | |
197 | $(single-used-m): %.o: %.c FORCE |
198 | $(call cmd,force_checksrc) |
199 | $(call if_changed_rule,cc_o_c) |
200 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod) |
201 | |
202 | quiet_cmd_cc_lst_c = MKLST $@ |
203 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ |
204 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ |
205 | System.map $(OBJDUMP) > $@ |
206 | |
207 | %.lst: %.c FORCE |
208 | $(call if_changed_dep,cc_lst_c) |
209 | |
210 | # Compile assembler sources (.S) |
211 | # --------------------------------------------------------------------------- |
212 | |
213 | modkern_aflags := $(AFLAGS_KERNEL) |
214 | |
215 | $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE) |
216 | $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE) |
217 | |
218 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@ |
219 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $< |
220 | |
221 | %.s: %.S FORCE |
222 | $(call if_changed_dep,as_s_S) |
223 | |
224 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ |
225 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< |
226 | |
227 | %.o: %.S FORCE |
228 | $(call if_changed_dep,as_o_S) |
229 | |
230 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) |
231 | targets += $(extra-y) $(MAKECMDGOALS) $(always) |
232 | |
233 | # Linker scripts preprocessor (.lds.S -> .lds) |
234 | # --------------------------------------------------------------------------- |
235 | quiet_cmd_cpp_lds_S = LDS $@ |
236 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $< |
237 | |
238 | %.lds: %.lds.S FORCE |
239 | $(call if_changed_dep,cpp_lds_S) |
240 | |
241 | # Build the compiled-in targets |
242 | # --------------------------------------------------------------------------- |
243 | |
244 | # To build objects in subdirs, we need to descend into the directories |
245 | $(sort $(subdir-obj-y)): $(subdir-ym) ; |
246 | |
247 | # |
248 | # Rule to compile a set of .o files into one .o file |
249 | # |
250 | ifdef builtin-target |
251 | quiet_cmd_link_o_target = LD $@ |
252 | # If the list of objects to link is empty, just create an empty built-in.o |
253 | cmd_link_o_target = $(if $(strip $(obj-y)),\ |
254 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\ |
255 | rm -f $@; $(AR) rcs $@) |
256 | |
257 | $(builtin-target): $(obj-y) FORCE |
258 | $(call if_changed,link_o_target) |
259 | |
260 | targets += $(builtin-target) |
261 | endif # builtin-target |
262 | |
263 | # |
264 | # Rule to compile a set of .o files into one .a file |
265 | # |
266 | ifdef lib-target |
267 | quiet_cmd_link_l_target = AR $@ |
268 | cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y) |
269 | |
270 | $(lib-target): $(lib-y) FORCE |
271 | $(call if_changed,link_l_target) |
272 | |
273 | targets += $(lib-target) |
274 | endif |
275 | |
276 | # |
277 | # Rule to link composite objects |
278 | # |
279 | # Composite objects are specified in kbuild makefile as follows: |
280 | # <composite-object>-objs := <list of .o files> |
281 | # or |
282 | # <composite-object>-y := <list of .o files> |
283 | link_multi_deps = \ |
284 | $(filter $(addprefix $(obj)/, \ |
285 | $($(subst $(obj)/,,$(@:.o=-objs))) \ |
286 | $($(subst $(obj)/,,$(@:.o=-y)))), $^) |
287 | |
288 | quiet_cmd_link_multi-y = LD $@ |
289 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) |
290 | |
291 | quiet_cmd_link_multi-m = LD [M] $@ |
292 | cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps) |
293 | |
294 | # We would rather have a list of rules like |
295 | # foo.o: $(foo-objs) |
296 | # but that's not so easy, so we rather make all composite objects depend |
297 | # on the set of all their parts |
298 | $(multi-used-y) : %.o: $(multi-objs-y) FORCE |
299 | $(call if_changed,link_multi-y) |
300 | |
301 | $(multi-used-m) : %.o: $(multi-objs-m) FORCE |
302 | $(call if_changed,link_multi-m) |
303 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) |
304 | |
305 | targets += $(multi-used-y) $(multi-used-m) |
306 | |
307 | |
308 | # Descending |
309 | # --------------------------------------------------------------------------- |
310 | |
311 | PHONY += $(subdir-ym) |
312 | $(subdir-ym): |
313 | $(Q)$(MAKE) $(build)=$@ |
314 | |
315 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. |
316 | # --------------------------------------------------------------------------- |
317 | |
318 | PHONY += FORCE |
319 | |
320 | FORCE: |
321 | |
322 | # Read all saved command lines and dependencies for the $(targets) we |
323 | # may be building above, using $(if_changed{,_dep}). As an |
324 | # optimization, we don't need to read them if the target does not |
325 | # exist, we will rebuild anyway in that case. |
326 | |
327 | targets := $(wildcard $(sort $(targets))) |
328 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) |
329 | |
330 | ifneq ($(cmd_files),) |
331 | include $(cmd_files) |
332 | endif |
333 | |
334 | |
335 | # Declare the contents of the .PHONY variable as phony. We keep that |
336 | # information in a variable se we can use it in if_changed and friends. |
337 | |
338 | .PHONY: $(PHONY) |