1 # ==========================================================================
3 # ==========================================================================
10 # Init all relevant variables used in kbuild files so
11 # 1) they have correct type
12 # 2) they do not inherit any value from the environment
33 # Read auto.conf if it exists, otherwise ignore
34 -include include/config/auto.conf
36 include scripts/Kbuild.include
38 # For backward compatibility check that these variables do not change
39 save-cflags := $(CFLAGS)
41 # The filename Kbuild has precedence over Makefile
42 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
43 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
44 include $(kbuild-file)
46 # If the save-* variables changed error out
47 ifeq ($(KBUILD_NOPEDANTIC),)
48 ifneq ("$(save-cflags)","$(CFLAGS)")
49 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS)
52 include scripts/Makefile.lib
55 ifneq ($(hostprogs-y),$(host-progs))
56 $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
57 hostprogs-y += $(host-progs)
61 # Do not include host rules unless needed
62 ifneq ($(hostprogs-y)$(hostprogs-m),)
63 include scripts/Makefile.host
66 ifneq ($(KBUILD_SRC),)
67 # Create output directory if not already present
68 _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
70 # Create directories for object files if directory does not exist
71 # Needed when obj-y := dir/file.o syntax is used
72 _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
76 $(warning kbuild: Makefile.build is included improperly)
79 # ===========================================================================
81 ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
82 lib-target := $(obj)/lib.a
85 ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(subdir-m) $(lib-target)),)
86 builtin-target := $(obj)/built-in.o
89 modorder-target := $(obj)/modules.order
91 # We keep a list of all modules in $(MODVERDIR)
93 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
94 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
95 $(subdir-ym) $(always)
98 # Linus' kernel sanity checking tool
99 ifneq ($(KBUILD_CHECKSRC),0)
100 ifeq ($(KBUILD_CHECKSRC),2)
101 quiet_cmd_force_checksrc = CHECK $<
102 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
104 quiet_cmd_checksrc = CHECK $<
105 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
109 # Do section mismatch analysis for each module/built-in.o
110 ifdef CONFIG_DEBUG_SECTION_MISMATCH
111 cmd_secanalysis = ; scripts/mod/modpost $@
114 # Compile C sources (.c)
115 # ---------------------------------------------------------------------------
117 # Default is built-in, unless we know otherwise
119 $(if $(part-of-module), \
120 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
121 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
122 quiet_modtag := $(empty) $(empty)
124 $(real-objs-m) : part-of-module := y
125 $(real-objs-m:.o=.i) : part-of-module := y
126 $(real-objs-m:.o=.s) : part-of-module := y
127 $(real-objs-m:.o=.lst): part-of-module := y
129 $(real-objs-m) : quiet_modtag := [M]
130 $(real-objs-m:.o=.i) : quiet_modtag := [M]
131 $(real-objs-m:.o=.s) : quiet_modtag := [M]
132 $(real-objs-m:.o=.lst): quiet_modtag := [M]
134 $(obj-m) : quiet_modtag := [M]
136 # Default for not multi-part modules
137 modname = $(basetarget)
139 $(multi-objs-m) : modname = $(modname-multi)
140 $(multi-objs-m:.o=.i) : modname = $(modname-multi)
141 $(multi-objs-m:.o=.s) : modname = $(modname-multi)
142 $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
143 $(multi-objs-y) : modname = $(modname-multi)
144 $(multi-objs-y:.o=.i) : modname = $(modname-multi)
145 $(multi-objs-y:.o=.s) : modname = $(modname-multi)
146 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
148 quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
149 cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
151 $(obj)/%.s: $(src)/%.c FORCE
152 $(call if_changed_dep,cc_s_c)
154 quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
155 cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
157 $(obj)/%.i: $(src)/%.c FORCE
158 $(call if_changed_dep,cc_i_c)
161 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
162 $(GENKSYMS) $(if $(1), -T $(2)) -a $(ARCH) \
163 $(if $(KBUILD_PRESERVE),-p) \
164 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
166 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
167 cmd_cc_symtypes_c = \
169 $(call cmd_gensymtypes,true,$@) >/dev/null; \
170 test -s $@ || rm -f $@
172 $(obj)/%.symtypes : $(src)/%.c FORCE
173 $(call cmd,cc_symtypes_c)
176 # The C file is compiled and updated dependency information is generated.
177 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
179 quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
181 ifndef CONFIG_MODVERSIONS
182 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
185 # When module versioning is enabled the following steps are executed:
186 # o compile a .tmp_<file>.o from <file>.c
187 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
188 # not export symbols, we just rename .tmp_<file>.o to <file>.o and
190 # o otherwise, we calculate symbol versions using the good old
191 # genksyms on the preprocessed source and postprocess them in a way
192 # that they are usable as a linker script
193 # o generate <file>.o from .tmp_<file>.o using the linker to
194 # replace the unresolved symbols __crc_exported_symbol with
195 # the actual value of the checksum generated by genksyms
197 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
199 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
200 $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
201 > $(@D)/.tmp_$(@F:.o=.ver); \
203 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
204 -T $(@D)/.tmp_$(@F:.o=.ver); \
205 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
207 mv -f $(@D)/.tmp_$(@F) $@; \
211 ifdef CONFIG_FTRACE_MCOUNT_RECORD
212 cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
213 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
214 "$(if $(CONFIG_64BIT),64,32)" \
215 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
216 "$(if $(part-of-module),1,0)" "$(@)";
220 $(call echo-cmd,checksrc) $(cmd_checksrc) \
221 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
223 $(call echo-cmd,record_mcount) \
224 $(cmd_record_mcount) \
225 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
228 mv -f $(dot-target).tmp $(dot-target).cmd
231 # Built-in and composite module parts
232 $(obj)/%.o: $(src)/%.c FORCE
233 $(call cmd,force_checksrc)
234 $(call if_changed_rule,cc_o_c)
236 # Single-part modules are special since we need to mark them in $(MODVERDIR)
238 $(single-used-m): $(obj)/%.o: $(src)/%.c FORCE
239 $(call cmd,force_checksrc)
240 $(call if_changed_rule,cc_o_c)
241 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
243 quiet_cmd_cc_lst_c = MKLST $@
244 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
245 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
246 System.map $(OBJDUMP) > $@
248 $(obj)/%.lst: $(src)/%.c FORCE
249 $(call if_changed_dep,cc_lst_c)
251 # Compile assembler sources (.S)
252 # ---------------------------------------------------------------------------
254 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
256 $(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
257 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
259 quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
260 cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
262 $(obj)/%.s: $(src)/%.S FORCE
263 $(call if_changed_dep,as_s_S)
265 quiet_cmd_as_o_S = AS $(quiet_modtag) $@
266 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
268 $(obj)/%.o: $(src)/%.S FORCE
269 $(call if_changed_dep,as_o_S)
271 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
272 targets += $(extra-y) $(MAKECMDGOALS) $(always)
274 # Linker scripts preprocessor (.lds.S -> .lds)
275 # ---------------------------------------------------------------------------
276 quiet_cmd_cpp_lds_S = LDS $@
277 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
278 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
280 $(obj)/%.lds: $(src)/%.lds.S FORCE
281 $(call if_changed_dep,cpp_lds_S)
283 # Build the compiled-in targets
284 # ---------------------------------------------------------------------------
286 # To build objects in subdirs, we need to descend into the directories
287 $(sort $(subdir-obj-y)): $(subdir-ym) ;
290 # Rule to compile a set of .o files into one .o file
293 quiet_cmd_link_o_target = LD $@
294 # If the list of objects to link is empty, just create an empty built-in.o
295 cmd_link_o_target = $(if $(strip $(obj-y)),\
296 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
298 rm -f $@; $(AR) rcs $@)
300 $(builtin-target): $(obj-y) FORCE
301 $(call if_changed,link_o_target)
303 targets += $(builtin-target)
304 endif # builtin-target
307 # Rule to create modules.order file
309 # Create commands to either record .ko file or cat modules.order from
312 $(foreach m, $(modorder), \
313 $(if $(filter %/modules.order, $m), \
314 cat $m;, echo kernel/$m;))
316 $(modorder-target): $(subdir-ym) FORCE
317 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
320 # Rule to compile a set of .o files into one .a file
323 quiet_cmd_link_l_target = AR $@
324 cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y)
326 $(lib-target): $(lib-y) FORCE
327 $(call if_changed,link_l_target)
329 targets += $(lib-target)
333 # Rule to link composite objects
335 # Composite objects are specified in kbuild makefile as follows:
336 # <composite-object>-objs := <list of .o files>
338 # <composite-object>-y := <list of .o files>
340 $(filter $(addprefix $(obj)/, \
341 $($(subst $(obj)/,,$(@:.o=-objs))) \
342 $($(subst $(obj)/,,$(@:.o=-y)))), $^)
344 quiet_cmd_link_multi-y = LD $@
345 cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
347 quiet_cmd_link_multi-m = LD [M] $@
348 cmd_link_multi-m = $(cmd_link_multi-y)
350 # We would rather have a list of rules like
352 # but that's not so easy, so we rather make all composite objects depend
353 # on the set of all their parts
354 $(multi-used-y) : %.o: $(multi-objs-y) FORCE
355 $(call if_changed,link_multi-y)
357 $(multi-used-m) : %.o: $(multi-objs-m) FORCE
358 $(call if_changed,link_multi-m)
359 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
361 targets += $(multi-used-y) $(multi-used-m)
365 # ---------------------------------------------------------------------------
367 PHONY += $(subdir-ym)
369 $(Q)$(MAKE) $(build)=$@
371 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
372 # ---------------------------------------------------------------------------
378 # Read all saved command lines and dependencies for the $(targets) we
379 # may be building above, using $(if_changed{,_dep}). As an
380 # optimization, we don't need to read them if the target does not
381 # exist, we will rebuild anyway in that case.
383 targets := $(wildcard $(sort $(targets)))
384 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
386 ifneq ($(cmd_files),)
391 # Declare the contents of the .PHONY variable as phony. We keep that
392 # information in a variable se we can use it in if_changed and friends.
398 # ---------------------------------------------------------------------------
399 quiet_cmd_uudecode_o_uu = DECODE $@
400 cmd_uudecode_o_uu = uudecode -o $@ $<
402 $(obj)/%.o: $(src)/%.uu FORCE
403 $(call if_changed,uudecode_o_uu)