1 # ==========================================================================
3 # ==========================================================================
10 # Read .config if it exist, otherwise ignore
11 -include include/config/auto.conf
13 include scripts/Kbuild.include
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, $(kbuild-dir)/Makefile)
19 include scripts/Makefile.lib
22 ifneq ($(hostprogs-y),$(host-progs))
23 $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
24 hostprogs-y += $(host-progs)
28 # Do not include host rules unles needed
29 ifneq ($(hostprogs-y)$(hostprogs-m),)
30 include scripts/Makefile.host
33 ifneq ($(KBUILD_SRC),)
34 # Create output directory if not already present
35 _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
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)))
44 $(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6. Please fix!)
48 $(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6. Please fix!)
52 $(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6. Please fix!)
56 $(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6. Please fix!)
60 $(error kbuild: $(obj)/Makefile - Use of L_TARGET is replaced by lib-y in 2.6. Please fix!)
64 $(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6. Please fix!)
68 $(warning kbuild: Makefile.build is included improperly)
71 # ===========================================================================
73 ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
74 lib-target := $(obj)/lib.a
77 ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),)
78 builtin-target := $(obj)/built-in.o
81 # We keep a list of all modules in $(MODVERDIR)
83 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
84 $(if $(KBUILD_MODULES),$(obj-m)) \
85 $(subdir-ym) $(always)
88 # Linus' kernel sanity checking tool
89 ifneq ($(KBUILD_CHECKSRC),0)
90 ifeq ($(KBUILD_CHECKSRC),2)
91 quiet_cmd_force_checksrc = CHECK $<
92 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
94 quiet_cmd_checksrc = CHECK $<
95 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
100 # Compile C sources (.c)
101 # ---------------------------------------------------------------------------
103 # Default is built-in, unless we know otherwise
104 modkern_cflags := $(CFLAGS_KERNEL)
105 quiet_modtag := $(empty) $(empty)
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)
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]
117 $(obj-m) : quiet_modtag := [M]
119 # Default for not multi-part modules
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)
131 quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
132 cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
135 $(call if_changed_dep,cc_s_c)
137 quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
138 cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
141 $(call if_changed_dep,cc_i_c)
143 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
144 cmd_cc_symtypes_c = \
145 $(CPP) -D__GENKSYMS__ $(c_flags) $< \
146 | $(GENKSYMS) -T $@ >/dev/null; \
147 test -s $@ || rm -f $@
149 %.symtypes : %.c FORCE
150 $(call if_changed_dep,cc_symtypes_c)
153 # The C file is compiled and updated dependency information is generated.
154 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
156 quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
158 ifndef CONFIG_MODVERSIONS
159 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
162 # When module versioning is enabled the following steps are executed:
163 # o compile a .tmp_<file>.o from <file>.c
164 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
165 # not export symbols, we just rename .tmp_<file>.o to <file>.o and
167 # o otherwise, we calculate symbol versions using the good old
168 # genksyms on the preprocessed source and postprocess them in a way
169 # that they are usable as a linker script
170 # o generate <file>.o from .tmp_<file>.o using the linker to
171 # replace the unresolved symbols __crc_exported_symbol with
172 # the actual value of the checksum generated by genksyms
174 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
176 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
177 $(CPP) -D__GENKSYMS__ $(c_flags) $< \
178 | $(GENKSYMS) $(if $(KBUILD_SYMTYPES), \
179 -T $(@D)/$(@F:.o=.symtypes)) -a $(ARCH) \
180 > $(@D)/.tmp_$(@F:.o=.ver); \
182 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
183 -T $(@D)/.tmp_$(@F:.o=.ver); \
184 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
186 mv -f $(@D)/.tmp_$(@F) $@; \
191 $(call echo-cmd,checksrc) $(cmd_checksrc) \
192 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
194 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > $(@D)/.$(@F).tmp; \
196 mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd
199 # Built-in and composite module parts
202 $(call cmd,force_checksrc)
203 $(call if_changed_rule,cc_o_c)
205 # Single-part modules are special since we need to mark them in $(MODVERDIR)
207 $(single-used-m): %.o: %.c FORCE
208 $(call cmd,force_checksrc)
209 $(call if_changed_rule,cc_o_c)
210 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
212 quiet_cmd_cc_lst_c = MKLST $@
213 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
214 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
215 System.map $(OBJDUMP) > $@
218 $(call if_changed_dep,cc_lst_c)
220 # Compile assembler sources (.S)
221 # ---------------------------------------------------------------------------
223 modkern_aflags := $(AFLAGS_KERNEL)
225 $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE)
226 $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
228 quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
229 cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
232 $(call if_changed_dep,as_s_S)
234 quiet_cmd_as_o_S = AS $(quiet_modtag) $@
235 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
238 $(call if_changed_dep,as_o_S)
240 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
241 targets += $(extra-y) $(MAKECMDGOALS) $(always)
243 # Linker scripts preprocessor (.lds.S -> .lds)
244 # ---------------------------------------------------------------------------
245 quiet_cmd_cpp_lds_S = LDS $@
246 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<
249 $(call if_changed_dep,cpp_lds_S)
251 # Build the compiled-in targets
252 # ---------------------------------------------------------------------------
254 # To build objects in subdirs, we need to descend into the directories
255 $(sort $(subdir-obj-y)): $(subdir-ym) ;
258 # Rule to compile a set of .o files into one .o file
261 quiet_cmd_link_o_target = LD $@
262 # If the list of objects to link is empty, just create an empty built-in.o
263 cmd_link_o_target = $(if $(strip $(obj-y)),\
264 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\
265 rm -f $@; $(AR) rcs $@)
267 $(builtin-target): $(obj-y) FORCE
268 $(call if_changed,link_o_target)
270 targets += $(builtin-target)
271 endif # builtin-target
274 # Rule to compile a set of .o files into one .a file
277 quiet_cmd_link_l_target = AR $@
278 cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y)
280 $(lib-target): $(lib-y) FORCE
281 $(call if_changed,link_l_target)
283 targets += $(lib-target)
287 # Rule to link composite objects
289 # Composite objects are specified in kbuild makefile as follows:
290 # <composite-object>-objs := <list of .o files>
292 # <composite-object>-y := <list of .o files>
294 $(filter $(addprefix $(obj)/, \
295 $($(subst $(obj)/,,$(@:.o=-objs))) \
296 $($(subst $(obj)/,,$(@:.o=-y)))), $^)
298 quiet_cmd_link_multi-y = LD $@
299 cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps)
301 quiet_cmd_link_multi-m = LD [M] $@
302 cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps)
304 # We would rather have a list of rules like
306 # but that's not so easy, so we rather make all composite objects depend
307 # on the set of all their parts
308 $(multi-used-y) : %.o: $(multi-objs-y) FORCE
309 $(call if_changed,link_multi-y)
311 $(multi-used-m) : %.o: $(multi-objs-m) FORCE
312 $(call if_changed,link_multi-m)
313 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
315 targets += $(multi-used-y) $(multi-used-m)
319 # ---------------------------------------------------------------------------
321 PHONY += $(subdir-ym)
323 $(Q)$(MAKE) $(build)=$@
325 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
326 # ---------------------------------------------------------------------------
332 # Read all saved command lines and dependencies for the $(targets) we
333 # may be building above, using $(if_changed{,_dep}). As an
334 # optimization, we don't need to read them if the target does not
335 # exist, we will rebuild anyway in that case.
337 targets := $(wildcard $(sort $(targets)))
338 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
340 ifneq ($(cmd_files),)
345 # Declare the contents of the .PHONY variable as phony. We keep that
346 # information in a variable se we can use it in if_changed and friends.