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 $(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) $@; \
232 ifdef CONFIG_FTRACE_MCOUNT_RECORD
233 # gcc 5 supports generating the mcount tables directly
234 ifneq ($(call cc-option,-mrecord-mcount,y),y)
235 KBUILD_CFLAGS += -mrecord-mcount
237 # else do it all manually
238 ifdef BUILD_C_RECORDMCOUNT
239 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
240 RECORDMCOUNT_FLAGS = -w
242 # Due to recursion, we must skip empty.o.
243 # The empty.o file is created in the make process in order to determine
244 # the target endianness and word size. It is made before all other C
245 # files, including recordmcount.
246 sub_cmd_record_mcount = \
247 if [ $(@) != "scripts/mod/empty.o" ]; then \
248 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
250 recordmcount_source := $(srctree)/scripts/recordmcount.c \
251 $(srctree)/scripts/recordmcount.h
253 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
254 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
255 "$(if $(CONFIG_64BIT),64,32)" \
256 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
257 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
258 "$(if $(part-of-module),1,0)" "$(@)";
259 recordmcount_source := $(srctree)/scripts/recordmcount.pl
261 cmd_record_mcount = \
262 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
263 "$(CC_FLAGS_FTRACE)" ]; then \
264 $(sub_cmd_record_mcount) \
266 endif # -record-mcount
270 $(call echo-cmd,checksrc) $(cmd_checksrc) \
271 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
273 $(call echo-cmd,record_mcount) \
274 $(cmd_record_mcount) \
275 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
278 mv -f $(dot-target).tmp $(dot-target).cmd
281 # Built-in and composite module parts
282 $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
283 $(call cmd,force_checksrc)
284 $(call if_changed_rule,cc_o_c)
286 # Single-part modules are special since we need to mark them in $(MODVERDIR)
288 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
289 $(call cmd,force_checksrc)
290 $(call if_changed_rule,cc_o_c)
291 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
293 quiet_cmd_cc_lst_c = MKLST $@
294 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
295 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
296 System.map $(OBJDUMP) > $@
298 $(obj)/%.lst: $(src)/%.c FORCE
299 $(call if_changed_dep,cc_lst_c)
301 # Compile assembler sources (.S)
302 # ---------------------------------------------------------------------------
304 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
306 $(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
307 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
309 quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
310 cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
312 $(obj)/%.s: $(src)/%.S FORCE
313 $(call if_changed_dep,as_s_S)
315 quiet_cmd_as_o_S = AS $(quiet_modtag) $@
316 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
318 $(obj)/%.o: $(src)/%.S FORCE
319 $(call if_changed_dep,as_o_S)
321 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
322 targets += $(extra-y) $(MAKECMDGOALS) $(always)
324 # Linker scripts preprocessor (.lds.S -> .lds)
325 # ---------------------------------------------------------------------------
326 quiet_cmd_cpp_lds_S = LDS $@
327 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
328 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
330 $(obj)/%.lds: $(src)/%.lds.S FORCE
331 $(call if_changed_dep,cpp_lds_S)
334 # ---------------------------------------------------------------------------
335 quiet_cmd_asn1_compiler = ASN.1 $@
336 cmd_asn1_compiler = $(objtree)/tools/asn1_compiler $< \
337 $(subst .h,.c,$@) $(subst .c,.h,$@)
339 $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/tools/asn1_compiler
340 $(call cmd,asn1_compiler)
342 # Build the compiled-in targets
343 # ---------------------------------------------------------------------------
345 # To build objects in subdirs, we need to descend into the directories
346 $(sort $(subdir-obj-y)): $(subdir-ym) ;
349 # Rule to compile a set of .o files into one .o file
352 quiet_cmd_link_o_target = LD $@
353 # If the list of objects to link is empty, just create an empty built-in.o
354 cmd_link_o_target = $(if $(strip $(obj-y)),\
355 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
357 rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
359 $(builtin-target): $(obj-y) FORCE
360 $(call if_changed,link_o_target)
362 targets += $(builtin-target)
363 endif # builtin-target
366 # Rule to create modules.order file
368 # Create commands to either record .ko file or cat modules.order from
371 $(foreach m, $(modorder), \
372 $(if $(filter %/modules.order, $m), \
373 cat $m;, echo kernel/$m;))
375 $(modorder-target): $(subdir-ym) FORCE
376 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
379 # Rule to compile a set of .o files into one .a file
382 quiet_cmd_link_l_target = AR $@
383 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
385 $(lib-target): $(lib-y) FORCE
386 $(call if_changed,link_l_target)
388 targets += $(lib-target)
392 # Rule to link composite objects
394 # Composite objects are specified in kbuild makefile as follows:
395 # <composite-object>-objs := <list of .o files>
397 # <composite-object>-y := <list of .o files>
399 $(filter $(addprefix $(obj)/, \
400 $($(subst $(obj)/,,$(@:.o=-objs))) \
401 $($(subst $(obj)/,,$(@:.o=-y)))), $^)
403 quiet_cmd_link_multi-y = LD $@
404 cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
406 quiet_cmd_link_multi-m = LD [M] $@
407 cmd_link_multi-m = $(cmd_link_multi-y)
409 $(multi-used-y): FORCE
410 $(call if_changed,link_multi-y)
411 $(call multi_depend, $(multi-used-y), .o, -objs -y)
413 $(multi-used-m): FORCE
414 $(call if_changed,link_multi-m)
415 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
416 $(call multi_depend, $(multi-used-m), .o, -objs -y)
418 targets += $(multi-used-y) $(multi-used-m)
421 # Add intermediate targets:
422 # When building objects with specific suffix patterns, add intermediate
423 # targets that the final targets are derived from.
424 intermediate_targets = $(foreach sfx, $(2), \
425 $(patsubst %$(strip $(1)),%$(sfx), \
426 $(filter %$(strip $(1)), $(targets))))
427 # %.lex.o <- %.lex.c <- %.l
428 # %.tab.o <- %.tab.[ch] <- %.y
429 targets += $(call intermediate_targets, .lex.o, .lex.c) \
430 $(call intermediate_targets, .tab.o, .tab.c .tab.h)
433 # ---------------------------------------------------------------------------
435 PHONY += $(subdir-ym)
437 $(Q)$(MAKE) $(build)=$@
439 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
440 # ---------------------------------------------------------------------------
446 # Read all saved command lines and dependencies for the $(targets) we
447 # may be building above, using $(if_changed{,_dep}). As an
448 # optimization, we don't need to read them if the target does not
449 # exist, we will rebuild anyway in that case.
451 targets := $(wildcard $(sort $(targets)))
452 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
454 ifneq ($(cmd_files),)