1 # ==========================================================================
3 # ==========================================================================
10 # Read .config if it exist, otherwise ignore
13 include $(if $(wildcard $(obj)/Kbuild), $(obj)/Kbuild, $(obj)/Makefile)
15 include scripts/Kbuild.include
16 include scripts/Makefile.lib
19 ifneq ($(hostprogs-y),$(host-progs))
20 $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
21 hostprogs-y += $(host-progs)
25 # Do not include host rules unles needed
26 ifneq ($(hostprogs-y)$(hostprogs-m),)
27 include scripts/Makefile.host
30 ifneq ($(KBUILD_SRC),)
31 # Create output directory if not already present
32 _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
34 # Create directories for object files if directory does not exist
35 # Needed when obj-y := dir/file.o syntax is used
36 _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
41 $(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6. Please fix!)
45 $(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6. Please fix!)
49 $(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6. Please fix!)
53 $(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6. Please fix!)
57 $(error kbuild: $(obj)/Makefile - Use of L_TARGET is replaced by lib-y in 2.6. Please fix!)
61 $(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6. Please fix!)
65 $(warning kbuild: Makefile.build is included improperly)
68 # ===========================================================================
70 ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
71 lib-target := $(obj)/lib.a
74 ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),)
75 builtin-target := $(obj)/built-in.o
78 # We keep a list of all modules in $(MODVERDIR)
80 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
81 $(if $(KBUILD_MODULES),$(obj-m)) \
82 $(subdir-ym) $(always)
85 # Linus' kernel sanity checking tool
86 ifneq ($(KBUILD_CHECKSRC),0)
87 ifeq ($(KBUILD_CHECKSRC),2)
88 quiet_cmd_force_checksrc = CHECK $<
89 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
91 quiet_cmd_checksrc = CHECK $<
92 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
97 # Compile C sources (.c)
98 # ---------------------------------------------------------------------------
100 # Default is built-in, unless we know otherwise
101 modkern_cflags := $(CFLAGS_KERNEL)
102 quiet_modtag := $(empty) $(empty)
104 $(real-objs-m) : modkern_cflags := $(CFLAGS_MODULE)
105 $(real-objs-m:.o=.i) : modkern_cflags := $(CFLAGS_MODULE)
106 $(real-objs-m:.o=.s) : modkern_cflags := $(CFLAGS_MODULE)
107 $(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE)
109 $(real-objs-m) : quiet_modtag := [M]
110 $(real-objs-m:.o=.i) : quiet_modtag := [M]
111 $(real-objs-m:.o=.s) : quiet_modtag := [M]
112 $(real-objs-m:.o=.lst): quiet_modtag := [M]
114 $(obj-m) : quiet_modtag := [M]
116 # Default for not multi-part modules
119 $(multi-objs-m) : modname = $(modname-multi)
120 $(multi-objs-m:.o=.i) : modname = $(modname-multi)
121 $(multi-objs-m:.o=.s) : modname = $(modname-multi)
122 $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
123 $(multi-objs-y) : modname = $(modname-multi)
124 $(multi-objs-y:.o=.i) : modname = $(modname-multi)
125 $(multi-objs-y:.o=.s) : modname = $(modname-multi)
126 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
128 quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
129 cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<
132 $(call if_changed_dep,cc_s_c)
134 quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
135 cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
138 $(call if_changed_dep,cc_i_c)
141 # The C file is compiled and updated dependency information is generated.
142 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
144 quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
146 ifndef CONFIG_MODVERSIONS
147 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
150 # When module versioning is enabled the following steps are executed:
151 # o compile a .tmp_<file>.o from <file>.c
152 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
153 # not export symbols, we just rename .tmp_<file>.o to <file>.o and
155 # o otherwise, we calculate symbol versions using the good old
156 # genksyms on the preprocessed source and postprocess them in a way
157 # that they are usable as a linker script
158 # o generate <file>.o from .tmp_<file>.o using the linker to
159 # replace the unresolved symbols __crc_exported_symbol with
160 # the actual value of the checksum generated by genksyms
162 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
164 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
165 $(CPP) -D__GENKSYMS__ $(c_flags) $< \
167 > $(@D)/.tmp_$(@F:.o=.ver); \
169 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
170 -T $(@D)/.tmp_$(@F:.o=.ver); \
171 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
173 mv -f $(@D)/.tmp_$(@F) $@; \
178 $(if $($(quiet)cmd_checksrc),echo ' $($(quiet)cmd_checksrc)';) \
180 $(if $($(quiet)cmd_cc_o_c),echo ' $(subst ','\'',$($(quiet)cmd_cc_o_c))';) \
183 scripts/basic/fixdep $(depfile) $@ '$(subst ','\'',$(cmd_cc_o_c))' > $(@D)/.$(@F).tmp; \
185 mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd
188 # Built-in and composite module parts
191 $(call cmd,force_checksrc)
192 $(call if_changed_rule,cc_o_c)
194 # Single-part modules are special since we need to mark them in $(MODVERDIR)
196 $(single-used-m): %.o: %.c FORCE
197 $(call cmd,force_checksrc)
198 $(call if_changed_rule,cc_o_c)
199 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
201 quiet_cmd_cc_lst_c = MKLST $@
202 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
203 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
204 System.map $(OBJDUMP) > $@
207 $(call if_changed_dep,cc_lst_c)
209 # Compile assembler sources (.S)
210 # ---------------------------------------------------------------------------
212 modkern_aflags := $(AFLAGS_KERNEL)
214 $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE)
215 $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
217 quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
218 cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
221 $(call if_changed_dep,as_s_S)
223 quiet_cmd_as_o_S = AS $(quiet_modtag) $@
224 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
227 $(call if_changed_dep,as_o_S)
229 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
230 targets += $(extra-y) $(MAKECMDGOALS) $(always)
232 # Linker scripts preprocessor (.lds.S -> .lds)
233 # ---------------------------------------------------------------------------
234 quiet_cmd_cpp_lds_S = LDS $@
235 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<
238 $(call if_changed_dep,cpp_lds_S)
240 # Build the compiled-in targets
241 # ---------------------------------------------------------------------------
243 # To build objects in subdirs, we need to descend into the directories
244 $(sort $(subdir-obj-y)): $(subdir-ym) ;
247 # Rule to compile a set of .o files into one .o file
250 quiet_cmd_link_o_target = LD $@
251 # If the list of objects to link is empty, just create an empty built-in.o
252 cmd_link_o_target = $(if $(strip $(obj-y)),\
253 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\
254 rm -f $@; $(AR) rcs $@)
256 $(builtin-target): $(obj-y) FORCE
257 $(call if_changed,link_o_target)
259 targets += $(builtin-target)
260 endif # builtin-target
263 # Rule to compile a set of .o files into one .a file
266 quiet_cmd_link_l_target = AR $@
267 cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y)
269 $(lib-target): $(lib-y) FORCE
270 $(call if_changed,link_l_target)
272 targets += $(lib-target)
276 # Rule to link composite objects
278 # Composite objects are specified in kbuild makefile as follows:
279 # <composite-object>-objs := <list of .o files>
281 # <composite-object>-y := <list of .o files>
283 $(filter $(addprefix $(obj)/, \
284 $($(subst $(obj)/,,$(@:.o=-objs))) \
285 $($(subst $(obj)/,,$(@:.o=-y)))), $^)
287 quiet_cmd_link_multi-y = LD $@
288 cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps)
290 quiet_cmd_link_multi-m = LD [M] $@
291 cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps)
293 # We would rather have a list of rules like
295 # but that's not so easy, so we rather make all composite objects depend
296 # on the set of all their parts
297 $(multi-used-y) : %.o: $(multi-objs-y) FORCE
298 $(call if_changed,link_multi-y)
300 $(multi-used-m) : %.o: $(multi-objs-m) FORCE
301 $(call if_changed,link_multi-m)
302 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
304 targets += $(multi-used-y) $(multi-used-m)
308 # ---------------------------------------------------------------------------
312 $(Q)$(MAKE) $(build)=$@
314 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
315 # ---------------------------------------------------------------------------
321 # Read all saved command lines and dependencies for the $(targets) we
322 # may be building above, using $(if_changed{,_dep}). As an
323 # optimization, we don't need to read them if the target does not
324 # exist, we will rebuild anyway in that case.
326 targets := $(wildcard $(sort $(targets)))
327 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
329 ifneq ($(cmd_files),)