1 # ==========================================================================
3 # ==========================================================================
7 src := $(patsubst $(prefix)/%,%,$(obj))
10 src := $(patsubst $(prefix)/%,%,$(obj))
19 # Init all relevant variables used in kbuild files so
20 # 1) they have correct type
21 # 2) they do not inherit any value from the environment
42 # Read auto.conf if it exists, otherwise ignore
44 -include include/config/auto.conf
45 -include $(prefix)/include/autoconf.mk
46 include scripts/Makefile.uncmd_spl
48 include scripts/Kbuild.include
50 # For backward compatibility check that these variables do not change
51 save-cflags := $(CFLAGS)
53 # The filename Kbuild has precedence over Makefile
54 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
55 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
56 include $(kbuild-file)
59 asflags-y += $(PLATFORM_CPPFLAGS)
60 ccflags-y += $(PLATFORM_CPPFLAGS)
61 cppflags-y += $(PLATFORM_CPPFLAGS)
63 # If the save-* variables changed error out
64 ifeq ($(KBUILD_NOPEDANTIC),)
65 ifneq ("$(save-cflags)","$(CFLAGS)")
66 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
70 include scripts/Makefile.lib
73 ifneq ($(hostprogs-y),$(host-progs))
74 $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
75 hostprogs-y += $(host-progs)
79 # Do not include host rules unless needed
80 ifneq ($(hostprogs-y)$(hostprogs-m),)
81 include scripts/Makefile.host
84 # Uncommented for U-Boot
85 # We need to create output dicrectory for SPL and TPL even for in-tree build
86 #ifneq ($(KBUILD_SRC),)
87 # Create output directory if not already present
88 _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
90 # Create directories for object files if directory does not exist
91 # Needed when obj-y := dir/file.o syntax is used
92 _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
96 $(warning kbuild: Makefile.build is included improperly)
99 # ===========================================================================
101 ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
102 lib-target := $(obj)/lib.a
105 ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
106 builtin-target := $(obj)/built-in.o
109 modorder-target := $(obj)/modules.order
111 # We keep a list of all modules in $(MODVERDIR)
113 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
114 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
115 $(subdir-ym) $(always)
118 # Linus' kernel sanity checking tool
119 ifneq ($(KBUILD_CHECKSRC),0)
120 ifeq ($(KBUILD_CHECKSRC),2)
121 quiet_cmd_force_checksrc = CHECK $<
122 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
124 quiet_cmd_checksrc = CHECK $<
125 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
129 # Do section mismatch analysis for each module/built-in.o
130 ifdef CONFIG_DEBUG_SECTION_MISMATCH
131 cmd_secanalysis = ; scripts/mod/modpost $@
134 # Compile C sources (.c)
135 # ---------------------------------------------------------------------------
137 # Default is built-in, unless we know otherwise
139 $(if $(part-of-module), \
140 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
141 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
142 quiet_modtag := $(empty) $(empty)
144 $(real-objs-m) : part-of-module := y
145 $(real-objs-m:.o=.i) : part-of-module := y
146 $(real-objs-m:.o=.s) : part-of-module := y
147 $(real-objs-m:.o=.lst): part-of-module := y
149 $(real-objs-m) : quiet_modtag := [M]
150 $(real-objs-m:.o=.i) : quiet_modtag := [M]
151 $(real-objs-m:.o=.s) : quiet_modtag := [M]
152 $(real-objs-m:.o=.lst): quiet_modtag := [M]
154 $(obj-m) : quiet_modtag := [M]
156 # Default for not multi-part modules
157 modname = $(basetarget)
159 $(multi-objs-m) : modname = $(modname-multi)
160 $(multi-objs-m:.o=.i) : modname = $(modname-multi)
161 $(multi-objs-m:.o=.s) : modname = $(modname-multi)
162 $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
163 $(multi-objs-y) : modname = $(modname-multi)
164 $(multi-objs-y:.o=.i) : modname = $(modname-multi)
165 $(multi-objs-y:.o=.s) : modname = $(modname-multi)
166 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
168 quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
169 cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
171 $(obj)/%.s: $(src)/%.c FORCE
172 $(call if_changed_dep,cc_s_c)
174 quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
175 cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
177 $(obj)/%.i: $(src)/%.c FORCE
178 $(call if_changed_dep,cc_i_c)
181 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
182 $(GENKSYMS) $(if $(1), -T $(2)) \
183 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
184 $(if $(KBUILD_PRESERVE),-p) \
185 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
187 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
188 cmd_cc_symtypes_c = \
190 $(call cmd_gensymtypes,true,$@) >/dev/null; \
191 test -s $@ || rm -f $@
193 $(obj)/%.symtypes : $(src)/%.c FORCE
194 $(call cmd,cc_symtypes_c)
197 # The C file is compiled and updated dependency information is generated.
198 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
200 quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
202 ifndef CONFIG_MODVERSIONS
203 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
206 # When module versioning is enabled the following steps are executed:
207 # o compile a .tmp_<file>.o from <file>.c
208 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
209 # not export symbols, we just rename .tmp_<file>.o to <file>.o and
211 # o otherwise, we calculate symbol versions using the good old
212 # genksyms on the preprocessed source and postprocess them in a way
213 # that they are usable as a linker script
214 # o generate <file>.o from .tmp_<file>.o using the linker to
215 # replace the unresolved symbols __crc_exported_symbol with
216 # the actual value of the checksum generated by genksyms
218 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
220 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
221 $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
222 > $(@D)/.tmp_$(@F:.o=.ver); \
224 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
225 -T $(@D)/.tmp_$(@F:.o=.ver); \
226 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
228 mv -f $(@D)/.tmp_$(@F) $@; \
232 ifdef CONFIG_FTRACE_MCOUNT_RECORD
233 ifdef BUILD_C_RECORDMCOUNT
234 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
235 RECORDMCOUNT_FLAGS = -w
237 # Due to recursion, we must skip empty.o.
238 # The empty.o file is created in the make process in order to determine
239 # the target endianness and word size. It is made before all other C
240 # files, including recordmcount.
241 sub_cmd_record_mcount = \
242 if [ $(@) != "scripts/mod/empty.o" ]; then \
243 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
245 recordmcount_source := $(srctree)/scripts/recordmcount.c \
246 $(srctree)/scripts/recordmcount.h
248 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
249 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
250 "$(if $(CONFIG_64BIT),64,32)" \
251 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
252 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
253 "$(if $(part-of-module),1,0)" "$(@)";
254 recordmcount_source := $(srctree)/scripts/recordmcount.pl
256 cmd_record_mcount = \
257 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
258 "$(CC_FLAGS_FTRACE)" ]; then \
259 $(sub_cmd_record_mcount) \
264 $(call echo-cmd,checksrc) $(cmd_checksrc) \
265 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
267 $(call echo-cmd,record_mcount) \
268 $(cmd_record_mcount) \
269 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
272 mv -f $(dot-target).tmp $(dot-target).cmd
275 # Built-in and composite module parts
276 $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
277 $(call cmd,force_checksrc)
278 $(call if_changed_rule,cc_o_c)
280 # Single-part modules are special since we need to mark them in $(MODVERDIR)
282 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
283 $(call cmd,force_checksrc)
284 $(call if_changed_rule,cc_o_c)
285 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
287 quiet_cmd_cc_lst_c = MKLST $@
288 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
289 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
290 System.map $(OBJDUMP) > $@
292 $(obj)/%.lst: $(src)/%.c FORCE
293 $(call if_changed_dep,cc_lst_c)
295 # Compile assembler sources (.S)
296 # ---------------------------------------------------------------------------
298 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
300 $(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
301 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
303 quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
304 cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
306 $(obj)/%.s: $(src)/%.S FORCE
307 $(call if_changed_dep,as_s_S)
309 quiet_cmd_as_o_S = AS $(quiet_modtag) $@
310 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
312 $(obj)/%.o: $(src)/%.S FORCE
313 $(call if_changed_dep,as_o_S)
315 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
316 targets += $(extra-y) $(MAKECMDGOALS) $(always)
318 # Linker scripts preprocessor (.lds.S -> .lds)
319 # ---------------------------------------------------------------------------
320 quiet_cmd_cpp_lds_S = LDS $@
321 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
322 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
324 $(obj)/%.lds: $(src)/%.lds.S FORCE
325 $(call if_changed_dep,cpp_lds_S)
328 # ---------------------------------------------------------------------------
329 quiet_cmd_asn1_compiler = ASN.1 $@
330 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
331 $(subst .h,.c,$@) $(subst .c,.h,$@)
333 .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
335 $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
336 $(call cmd,asn1_compiler)
338 # Build the compiled-in targets
339 # ---------------------------------------------------------------------------
341 # To build objects in subdirs, we need to descend into the directories
342 $(sort $(subdir-obj-y)): $(subdir-ym) ;
345 # Rule to compile a set of .o files into one .o file
348 quiet_cmd_link_o_target = LD $@
349 # If the list of objects to link is empty, just create an empty built-in.o
350 cmd_link_o_target = $(if $(strip $(obj-y)),\
351 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
353 rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
355 $(builtin-target): $(obj-y) FORCE
356 $(call if_changed,link_o_target)
358 targets += $(builtin-target)
359 endif # builtin-target
362 # Rule to create modules.order file
364 # Create commands to either record .ko file or cat modules.order from
367 $(foreach m, $(modorder), \
368 $(if $(filter %/modules.order, $m), \
369 cat $m;, echo kernel/$m;))
371 $(modorder-target): $(subdir-ym) FORCE
372 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
375 # Rule to compile a set of .o files into one .a file
378 quiet_cmd_link_l_target = AR $@
379 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
381 $(lib-target): $(lib-y) FORCE
382 $(call if_changed,link_l_target)
384 targets += $(lib-target)
388 # Rule to link composite objects
390 # Composite objects are specified in kbuild makefile as follows:
391 # <composite-object>-objs := <list of .o files>
393 # <composite-object>-y := <list of .o files>
395 $(filter $(addprefix $(obj)/, \
396 $($(subst $(obj)/,,$(@:.o=-objs))) \
397 $($(subst $(obj)/,,$(@:.o=-y)))), $^)
399 quiet_cmd_link_multi-y = LD $@
400 cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
402 quiet_cmd_link_multi-m = LD [M] $@
403 cmd_link_multi-m = $(cmd_link_multi-y)
405 $(multi-used-y): FORCE
406 $(call if_changed,link_multi-y)
407 $(call multi_depend, $(multi-used-y), .o, -objs -y)
409 $(multi-used-m): FORCE
410 $(call if_changed,link_multi-m)
411 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
412 $(call multi_depend, $(multi-used-m), .o, -objs -y)
414 targets += $(multi-used-y) $(multi-used-m)
418 # ---------------------------------------------------------------------------
420 PHONY += $(subdir-ym)
422 $(Q)$(MAKE) $(build)=$@
424 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
425 # ---------------------------------------------------------------------------
431 # Read all saved command lines and dependencies for the $(targets) we
432 # may be building above, using $(if_changed{,_dep}). As an
433 # optimization, we don't need to read them if the target does not
434 # exist, we will rebuild anyway in that case.
436 targets := $(wildcard $(sort $(targets)))
437 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
439 ifneq ($(cmd_files),)
443 # Declare the contents of the .PHONY variable as phony. We keep that
444 # information in a variable se we can use it in if_changed and friends.