1 # SPDX-License-Identifier: GPL-2.0
2 # ==========================================================================
4 # ==========================================================================
8 src := $(patsubst $(prefix)/%,%,$(obj))
11 src := $(patsubst $(prefix)/%,%,$(obj))
20 # Init all relevant variables used in kbuild files so
21 # 1) they have correct type
22 # 2) they do not inherit any value from the environment
43 # Read auto.conf if it exists, otherwise ignore
45 -include include/config/auto.conf
46 -include $(prefix)/include/autoconf.mk
47 include scripts/Makefile.uncmd_spl
49 include scripts/Kbuild.include
51 # For backward compatibility check that these variables do not change
52 save-cflags := $(CFLAGS)
54 # The filename Kbuild has precedence over Makefile
55 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
56 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
57 include $(kbuild-file)
60 asflags-y += $(PLATFORM_CPPFLAGS)
61 ccflags-y += $(PLATFORM_CPPFLAGS)
62 cppflags-y += $(PLATFORM_CPPFLAGS)
64 # If the save-* variables changed error out
65 ifeq ($(KBUILD_NOPEDANTIC),)
66 ifneq ("$(save-cflags)","$(CFLAGS)")
67 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
71 include scripts/Makefile.lib
74 ifneq ($(hostprogs-y),$(host-progs))
75 $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
76 hostprogs-y += $(host-progs)
80 # Do not include host rules unless needed
81 ifneq ($(hostprogs-y)$(hostprogs-m),)
82 include scripts/Makefile.host
85 # Uncommented for U-Boot
86 # We need to create output dicrectory for SPL and TPL even for in-tree build
87 #ifneq ($(KBUILD_SRC),)
88 # Create output directory if not already present
89 _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
91 # Create directories for object files if directory does not exist
92 # Needed when obj-y := dir/file.o syntax is used
93 _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
97 $(warning kbuild: Makefile.build is included improperly)
100 # ===========================================================================
102 ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
103 lib-target := $(obj)/lib.a
106 ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
107 builtin-target := $(obj)/built-in.o
110 modorder-target := $(obj)/modules.order
112 # We keep a list of all modules in $(MODVERDIR)
114 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
115 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
116 $(subdir-ym) $(always)
119 # Linus' kernel sanity checking tool
120 ifneq ($(KBUILD_CHECKSRC),0)
121 ifeq ($(KBUILD_CHECKSRC),2)
122 quiet_cmd_force_checksrc = CHECK $<
123 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
125 quiet_cmd_checksrc = CHECK $<
126 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
130 # Do section mismatch analysis for each module/built-in.o
131 ifdef CONFIG_DEBUG_SECTION_MISMATCH
132 cmd_secanalysis = ; scripts/mod/modpost $@
135 # Compile C sources (.c)
136 # ---------------------------------------------------------------------------
138 # Default is built-in, unless we know otherwise
140 $(if $(part-of-module), \
141 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
142 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
143 quiet_modtag := $(empty) $(empty)
145 $(real-objs-m) : part-of-module := y
146 $(real-objs-m:.o=.i) : part-of-module := y
147 $(real-objs-m:.o=.s) : part-of-module := y
148 $(real-objs-m:.o=.lst): part-of-module := y
150 $(real-objs-m) : quiet_modtag := [M]
151 $(real-objs-m:.o=.i) : quiet_modtag := [M]
152 $(real-objs-m:.o=.s) : quiet_modtag := [M]
153 $(real-objs-m:.o=.lst): quiet_modtag := [M]
155 $(obj-m) : quiet_modtag := [M]
157 # Default for not multi-part modules
158 modname = $(basetarget)
160 $(multi-objs-m) : modname = $(modname-multi)
161 $(multi-objs-m:.o=.i) : modname = $(modname-multi)
162 $(multi-objs-m:.o=.s) : modname = $(modname-multi)
163 $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
164 $(multi-objs-y) : modname = $(modname-multi)
165 $(multi-objs-y:.o=.i) : modname = $(modname-multi)
166 $(multi-objs-y:.o=.s) : modname = $(modname-multi)
167 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
169 quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
170 cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
172 $(obj)/%.s: $(src)/%.c FORCE
173 $(call if_changed_dep,cc_s_c)
175 quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
176 cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
178 $(obj)/%.i: $(src)/%.c FORCE
179 $(call if_changed_dep,cc_i_c)
182 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
183 $(GENKSYMS) $(if $(1), -T $(2)) \
184 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
185 $(if $(KBUILD_PRESERVE),-p) \
186 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
188 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
189 cmd_cc_symtypes_c = \
191 $(call cmd_gensymtypes,true,$@) >/dev/null; \
192 test -s $@ || rm -f $@
194 $(obj)/%.symtypes : $(src)/%.c FORCE
195 $(call cmd,cc_symtypes_c)
198 # The C file is compiled and updated dependency information is generated.
199 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
201 quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
203 ifndef CONFIG_MODVERSIONS
204 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
207 # When module versioning is enabled the following steps are executed:
208 # o compile a .tmp_<file>.o from <file>.c
209 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
210 # not export symbols, we just rename .tmp_<file>.o to <file>.o and
212 # o otherwise, we calculate symbol versions using the good old
213 # genksyms on the preprocessed source and postprocess them in a way
214 # that they are usable as a linker script
215 # o generate <file>.o from .tmp_<file>.o using the linker to
216 # replace the unresolved symbols __crc_exported_symbol with
217 # the actual value of the checksum generated by genksyms
219 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
221 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
222 $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
223 > $(@D)/.tmp_$(@F:.o=.ver); \
225 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
226 -T $(@D)/.tmp_$(@F:.o=.ver); \
227 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
229 mv -f $(@D)/.tmp_$(@F) $@; \
233 ifdef CONFIG_FTRACE_MCOUNT_RECORD
234 ifdef BUILD_C_RECORDMCOUNT
235 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
236 RECORDMCOUNT_FLAGS = -w
238 # Due to recursion, we must skip empty.o.
239 # The empty.o file is created in the make process in order to determine
240 # the target endianness and word size. It is made before all other C
241 # files, including recordmcount.
242 sub_cmd_record_mcount = \
243 if [ $(@) != "scripts/mod/empty.o" ]; then \
244 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
246 recordmcount_source := $(srctree)/scripts/recordmcount.c \
247 $(srctree)/scripts/recordmcount.h
249 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
250 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
251 "$(if $(CONFIG_64BIT),64,32)" \
252 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
253 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
254 "$(if $(part-of-module),1,0)" "$(@)";
255 recordmcount_source := $(srctree)/scripts/recordmcount.pl
257 cmd_record_mcount = \
258 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
259 "$(CC_FLAGS_FTRACE)" ]; then \
260 $(sub_cmd_record_mcount) \
265 $(call echo-cmd,checksrc) $(cmd_checksrc) \
266 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
268 $(call echo-cmd,record_mcount) \
269 $(cmd_record_mcount) \
270 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
273 mv -f $(dot-target).tmp $(dot-target).cmd
276 # Built-in and composite module parts
277 $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
278 $(call cmd,force_checksrc)
279 $(call if_changed_rule,cc_o_c)
281 # Single-part modules are special since we need to mark them in $(MODVERDIR)
283 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
284 $(call cmd,force_checksrc)
285 $(call if_changed_rule,cc_o_c)
286 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
288 quiet_cmd_cc_lst_c = MKLST $@
289 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
290 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
291 System.map $(OBJDUMP) > $@
293 $(obj)/%.lst: $(src)/%.c FORCE
294 $(call if_changed_dep,cc_lst_c)
296 # Compile assembler sources (.S)
297 # ---------------------------------------------------------------------------
299 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
301 $(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
302 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
304 quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
305 cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
307 $(obj)/%.s: $(src)/%.S FORCE
308 $(call if_changed_dep,as_s_S)
310 quiet_cmd_as_o_S = AS $(quiet_modtag) $@
311 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
313 $(obj)/%.o: $(src)/%.S FORCE
314 $(call if_changed_dep,as_o_S)
316 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
317 targets += $(extra-y) $(MAKECMDGOALS) $(always)
319 # Linker scripts preprocessor (.lds.S -> .lds)
320 # ---------------------------------------------------------------------------
321 quiet_cmd_cpp_lds_S = LDS $@
322 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
323 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
325 $(obj)/%.lds: $(src)/%.lds.S FORCE
326 $(call if_changed_dep,cpp_lds_S)
329 # ---------------------------------------------------------------------------
330 quiet_cmd_asn1_compiler = ASN.1 $@
331 cmd_asn1_compiler = $(objtree)/tools/asn1_compiler $< \
332 $(subst .h,.c,$@) $(subst .c,.h,$@)
334 $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/tools/asn1_compiler
335 $(call cmd,asn1_compiler)
337 # Build the compiled-in targets
338 # ---------------------------------------------------------------------------
340 # To build objects in subdirs, we need to descend into the directories
341 $(sort $(subdir-obj-y)): $(subdir-ym) ;
344 # Rule to compile a set of .o files into one .o file
347 quiet_cmd_link_o_target = LD $@
348 # If the list of objects to link is empty, just create an empty built-in.o
349 cmd_link_o_target = $(if $(strip $(obj-y)),\
350 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
352 rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
354 $(builtin-target): $(obj-y) FORCE
355 $(call if_changed,link_o_target)
357 targets += $(builtin-target)
358 endif # builtin-target
361 # Rule to create modules.order file
363 # Create commands to either record .ko file or cat modules.order from
366 $(foreach m, $(modorder), \
367 $(if $(filter %/modules.order, $m), \
368 cat $m;, echo kernel/$m;))
370 $(modorder-target): $(subdir-ym) FORCE
371 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
374 # Rule to compile a set of .o files into one .a file
377 quiet_cmd_link_l_target = AR $@
378 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
380 $(lib-target): $(lib-y) FORCE
381 $(call if_changed,link_l_target)
383 targets += $(lib-target)
387 # Rule to link composite objects
389 # Composite objects are specified in kbuild makefile as follows:
390 # <composite-object>-objs := <list of .o files>
392 # <composite-object>-y := <list of .o files>
394 $(filter $(addprefix $(obj)/, \
395 $($(subst $(obj)/,,$(@:.o=-objs))) \
396 $($(subst $(obj)/,,$(@:.o=-y)))), $^)
398 quiet_cmd_link_multi-y = LD $@
399 cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
401 quiet_cmd_link_multi-m = LD [M] $@
402 cmd_link_multi-m = $(cmd_link_multi-y)
404 $(multi-used-y): FORCE
405 $(call if_changed,link_multi-y)
406 $(call multi_depend, $(multi-used-y), .o, -objs -y)
408 $(multi-used-m): FORCE
409 $(call if_changed,link_multi-m)
410 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
411 $(call multi_depend, $(multi-used-m), .o, -objs -y)
413 targets += $(multi-used-y) $(multi-used-m)
416 # Add intermediate targets:
417 # When building objects with specific suffix patterns, add intermediate
418 # targets that the final targets are derived from.
419 intermediate_targets = $(foreach sfx, $(2), \
420 $(patsubst %$(strip $(1)),%$(sfx), \
421 $(filter %$(strip $(1)), $(targets))))
422 # %.lex.o <- %.lex.c <- %.l
423 # %.tab.o <- %.tab.[ch] <- %.y
424 targets += $(call intermediate_targets, .lex.o, .lex.c) \
425 $(call intermediate_targets, .tab.o, .tab.c .tab.h)
428 # ---------------------------------------------------------------------------
430 PHONY += $(subdir-ym)
432 $(Q)$(MAKE) $(build)=$@
434 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
435 # ---------------------------------------------------------------------------
441 # Read all saved command lines and dependencies for the $(targets) we
442 # may be building above, using $(if_changed{,_dep}). As an
443 # optimization, we don't need to read them if the target does not
444 # exist, we will rebuild anyway in that case.
446 targets := $(wildcard $(sort $(targets)))
447 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
449 ifneq ($(cmd_files),)
453 # Declare the contents of the .PHONY variable as phony. We keep that
454 # information in a variable se we can use it in if_changed and friends.