1 # ==========================================================================
3 # ==========================================================================
10 # Read .config if it exist, otherwise ignore
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44 $(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6.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48 $(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6.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52 $(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6.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56 $(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6.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64 $(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6.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) -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)
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)
147 quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
149 ifndef CONFIG_MODVERSIONS
150 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
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
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
165 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
167 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
168 $(CPP) -D__GENKSYMS__ $(c_flags) $< \
170 > $(@D)/.tmp_$(@F:.o=.ver); \
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); \
176 mv -f $(@D)/.tmp_$(@F) $@; \
181 $(if $($(quiet)cmd_checksrc),echo ' $($(quiet)cmd_checksrc)';) \
183 $(if $($(quiet)cmd_cc_o_c),echo ' $(call escsq,$($(quiet)cmd_cc_o_c))';) \
186 scripts/basic/fixdep $(depfile) $@ '$(call escsq,$(cmd_cc_o_c))' > $(@D)/.$(@F).tmp; \
188 mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd
191 # Built-in and composite module parts
194 $(call cmd,force_checksrc)
195 $(call if_changed_rule,cc_o_c)
197 # Single-part modules are special since we need to mark them in $(MODVERDIR)
199 $(single-used-m): %.o: %.c FORCE
200 $(call cmd,force_checksrc)
201 $(call if_changed_rule,cc_o_c)
202 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
204 quiet_cmd_cc_lst_c = MKLST $@
205 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
206 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
207 System.map $(OBJDUMP) > $@
210 $(call if_changed_dep,cc_lst_c)
212 # Compile assembler sources (.S)
213 # ---------------------------------------------------------------------------
215 modkern_aflags := $(AFLAGS_KERNEL)
217 $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE)
218 $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
220 quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
221 cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
224 $(call if_changed_dep,as_s_S)
226 quiet_cmd_as_o_S = AS $(quiet_modtag) $@
227 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
230 $(call if_changed_dep,as_o_S)
232 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
233 targets += $(extra-y) $(MAKECMDGOALS) $(always)
235 # Linker scripts preprocessor (.lds.S -> .lds)
236 # ---------------------------------------------------------------------------
237 quiet_cmd_cpp_lds_S = LDS $@
238 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<
241 $(call if_changed_dep,cpp_lds_S)
243 # Build the compiled-in targets
244 # ---------------------------------------------------------------------------
246 # To build objects in subdirs, we need to descend into the directories
247 $(sort $(subdir-obj-y)): $(subdir-ym) ;
250 # Rule to compile a set of .o files into one .o file
253 quiet_cmd_link_o_target = LD $@
254 # If the list of objects to link is empty, just create an empty built-in.o
255 cmd_link_o_target = $(if $(strip $(obj-y)),\
256 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\
257 rm -f $@; $(AR) rcs $@)
259 $(builtin-target): $(obj-y) FORCE
260 $(call if_changed,link_o_target)
262 targets += $(builtin-target)
263 endif # builtin-target
266 # Rule to compile a set of .o files into one .a file
269 quiet_cmd_link_l_target = AR $@
270 cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y)
272 $(lib-target): $(lib-y) FORCE
273 $(call if_changed,link_l_target)
275 targets += $(lib-target)
279 # Rule to link composite objects
281 # Composite objects are specified in kbuild makefile as follows:
282 # <composite-object>-objs := <list of .o files>
284 # <composite-object>-y := <list of .o files>
286 $(filter $(addprefix $(obj)/, \
287 $($(subst $(obj)/,,$(@:.o=-objs))) \
288 $($(subst $(obj)/,,$(@:.o=-y)))), $^)
290 quiet_cmd_link_multi-y = LD $@
291 cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps)
293 quiet_cmd_link_multi-m = LD [M] $@
294 cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps)
296 # We would rather have a list of rules like
298 # but that's not so easy, so we rather make all composite objects depend
299 # on the set of all their parts
300 $(multi-used-y) : %.o: $(multi-objs-y) FORCE
301 $(call if_changed,link_multi-y)
303 $(multi-used-m) : %.o: $(multi-objs-m) FORCE
304 $(call if_changed,link_multi-m)
305 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
307 targets += $(multi-used-y) $(multi-used-m)
311 # ---------------------------------------------------------------------------
315 $(Q)$(MAKE) $(build)=$@
317 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
318 # ---------------------------------------------------------------------------
324 # Read all saved command lines and dependencies for the $(targets) we
325 # may be building above, using $(if_changed{,_dep}). As an
326 # optimization, we don't need to read them if the target does not
327 # exist, we will rebuild anyway in that case.
329 targets := $(wildcard $(sort $(targets)))
330 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
332 ifneq ($(cmd_files),)