1# ========================================================================== 2# Building 3# ========================================================================== 4 5# Modified for U-Boot 6ifeq ($(CONFIG_TPL_BUILD),y) 7 src := $(patsubst tpl/%,%,$(obj)) 8else 9 ifeq ($(CONFIG_SPL_BUILD),y) 10 src := $(patsubst spl/%,%,$(obj)) 11 else 12 src := $(obj) 13 endif 14endif 15 16PHONY := __build 17__build: 18 19# Init all relevant variables used in kbuild files so 20# 1) they have correct type 21# 2) they do not inherit any value from the environment 22obj-y := 23obj-m := 24lib-y := 25lib-m := 26always := 27targets := 28subdir-y := 29subdir-m := 30EXTRA_AFLAGS := 31EXTRA_CFLAGS := 32EXTRA_CPPFLAGS := 33EXTRA_LDFLAGS := 34asflags-y := 35ccflags-y := 36cppflags-y := 37ldflags-y := 38 39subdir-asflags-y := 40subdir-ccflags-y := 41 42# Read auto.conf if it exists, otherwise ignore 43-include include/config/auto.conf 44 45# Added for U-Boot: Load U-Boot configuration 46ifeq ($(CONFIG_TPL_BUILD),y) 47 -include include/tpl-autoconf.mk 48else 49 ifeq ($(CONFIG_SPL_BUILD),y) 50 -include include/spl-autoconf.mk 51 else 52 -include include/autoconf.mk 53 endif 54endif 55 56include scripts/Kbuild.include 57 58# For backward compatibility check that these variables do not change 59save-cflags := $(CFLAGS) 60 61# The filename Kbuild has precedence over Makefile 62kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) 63kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) 64include $(kbuild-file) 65 66# Added for U-Boot 67asflags-y += $(PLATFORM_CPPFLAGS) 68ccflags-y += $(PLATFORM_CPPFLAGS) 69cppflags-y += $(PLATFORM_CPPFLAGS) 70 71# If the save-* variables changed error out 72ifeq ($(KBUILD_NOPEDANTIC),) 73 ifneq ("$(save-cflags)","$(CFLAGS)") 74 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y) 75 endif 76endif 77 78# 79# make W=... settings 80# 81# W=1 - warnings that may be relevant and does not occur too often 82# W=2 - warnings that occur quite often but may still be relevant 83# W=3 - the more obscure warnings, can most likely be ignored 84# 85# $(call cc-option, -W...) handles gcc -W.. options which 86# are not supported by all versions of the compiler 87ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS 88warning- := $(empty) 89 90warning-1 := -Wextra -Wunused -Wno-unused-parameter 91warning-1 += -Wmissing-declarations 92warning-1 += -Wmissing-format-attribute 93warning-1 += -Wmissing-prototypes 94warning-1 += -Wold-style-definition 95warning-1 += $(call cc-option, -Wmissing-include-dirs) 96warning-1 += $(call cc-option, -Wunused-but-set-variable) 97warning-1 += $(call cc-disable-warning, missing-field-initializers) 98 99warning-2 := -Waggregate-return 100warning-2 += -Wcast-align 101warning-2 += -Wdisabled-optimization 102warning-2 += -Wnested-externs 103warning-2 += -Wshadow 104warning-2 += $(call cc-option, -Wlogical-op) 105warning-2 += $(call cc-option, -Wmissing-field-initializers) 106 107warning-3 := -Wbad-function-cast 108warning-3 += -Wcast-qual 109warning-3 += -Wconversion 110warning-3 += -Wpacked 111warning-3 += -Wpadded 112warning-3 += -Wpointer-arith 113warning-3 += -Wredundant-decls 114warning-3 += -Wswitch-default 115warning-3 += $(call cc-option, -Wpacked-bitfield-compat) 116warning-3 += $(call cc-option, -Wvla) 117 118warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 119warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 120warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 121 122ifeq ("$(strip $(warning))","") 123 $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown) 124endif 125 126KBUILD_CFLAGS += $(warning) 127endif 128 129include scripts/Makefile.lib 130 131ifdef host-progs 132ifneq ($(hostprogs-y),$(host-progs)) 133$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) 134hostprogs-y += $(host-progs) 135endif 136endif 137 138# Do not include host rules unless needed 139ifneq ($(hostprogs-y)$(hostprogs-m),) 140include scripts/Makefile.host 141endif 142 143# Uncommented for U-Boot 144# We need to create output dicrectory for SPL and TPL even for in-tree build 145#ifneq ($(KBUILD_SRC),) 146# Create output directory if not already present 147_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) 148 149# Create directories for object files if directory does not exist 150# Needed when obj-y := dir/file.o syntax is used 151_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) 152#endif 153 154ifndef obj 155$(warning kbuild: Makefile.build is included improperly) 156endif 157 158# =========================================================================== 159 160ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),) 161lib-target := $(obj)/lib.a 162endif 163 164ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(subdir-m) $(lib-target)),) 165builtin-target := $(obj)/built-in.o 166endif 167 168modorder-target := $(obj)/modules.order 169 170# We keep a list of all modules in $(MODVERDIR) 171 172__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ 173 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \ 174 $(subdir-ym) $(always) 175 @: 176 177# Linus' kernel sanity checking tool 178ifneq ($(KBUILD_CHECKSRC),0) 179 ifeq ($(KBUILD_CHECKSRC),2) 180 quiet_cmd_force_checksrc = CHECK $< 181 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; 182 else 183 quiet_cmd_checksrc = CHECK $< 184 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; 185 endif 186endif 187 188# Do section mismatch analysis for each module/built-in.o 189ifdef CONFIG_DEBUG_SECTION_MISMATCH 190 cmd_secanalysis = ; scripts/mod/modpost $@ 191endif 192 193# Compile C sources (.c) 194# --------------------------------------------------------------------------- 195 196# Default is built-in, unless we know otherwise 197modkern_cflags = \ 198 $(if $(part-of-module), \ 199 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ 200 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL)) 201quiet_modtag := $(empty) $(empty) 202 203$(real-objs-m) : part-of-module := y 204$(real-objs-m:.o=.i) : part-of-module := y 205$(real-objs-m:.o=.s) : part-of-module := y 206$(real-objs-m:.o=.lst): part-of-module := y 207 208$(real-objs-m) : quiet_modtag := [M] 209$(real-objs-m:.o=.i) : quiet_modtag := [M] 210$(real-objs-m:.o=.s) : quiet_modtag := [M] 211$(real-objs-m:.o=.lst): quiet_modtag := [M] 212 213$(obj-m) : quiet_modtag := [M] 214 215# Default for not multi-part modules 216modname = $(basetarget) 217 218$(multi-objs-m) : modname = $(modname-multi) 219$(multi-objs-m:.o=.i) : modname = $(modname-multi) 220$(multi-objs-m:.o=.s) : modname = $(modname-multi) 221$(multi-objs-m:.o=.lst) : modname = $(modname-multi) 222$(multi-objs-y) : modname = $(modname-multi) 223$(multi-objs-y:.o=.i) : modname = $(modname-multi) 224$(multi-objs-y:.o=.s) : modname = $(modname-multi) 225$(multi-objs-y:.o=.lst) : modname = $(modname-multi) 226 227quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ 228cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $< 229 230$(obj)/%.s: $(src)/%.c FORCE 231 $(call if_changed_dep,cc_s_c) 232 233quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@ 234cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $< 235 236$(obj)/%.i: $(src)/%.c FORCE 237 $(call if_changed_dep,cc_i_c) 238 239cmd_gensymtypes = \ 240 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ 241 $(GENKSYMS) $(if $(1), -T $(2)) \ 242 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \ 243 $(if $(KBUILD_PRESERVE),-p) \ 244 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) 245 246quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ 247cmd_cc_symtypes_c = \ 248 set -e; \ 249 $(call cmd_gensymtypes,true,$@) >/dev/null; \ 250 test -s $@ || rm -f $@ 251 252$(obj)/%.symtypes : $(src)/%.c FORCE 253 $(call cmd,cc_symtypes_c) 254 255# C (.c) files 256# The C file is compiled and updated dependency information is generated. 257# (See cmd_cc_o_c + relevant part of rule_cc_o_c) 258 259quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ 260 261ifndef CONFIG_MODVERSIONS 262cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 263 264else 265# When module versioning is enabled the following steps are executed: 266# o compile a .tmp_<file>.o from <file>.c 267# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does 268# not export symbols, we just rename .tmp_<file>.o to <file>.o and 269# are done. 270# o otherwise, we calculate symbol versions using the good old 271# genksyms on the preprocessed source and postprocess them in a way 272# that they are usable as a linker script 273# o generate <file>.o from .tmp_<file>.o using the linker to 274# replace the unresolved symbols __crc_exported_symbol with 275# the actual value of the checksum generated by genksyms 276 277cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< 278cmd_modversions = \ 279 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ 280 $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ 281 > $(@D)/.tmp_$(@F:.o=.ver); \ 282 \ 283 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ 284 -T $(@D)/.tmp_$(@F:.o=.ver); \ 285 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ 286 else \ 287 mv -f $(@D)/.tmp_$(@F) $@; \ 288 fi; 289endif 290 291ifdef CONFIG_FTRACE_MCOUNT_RECORD 292ifdef BUILD_C_RECORDMCOUNT 293ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") 294 RECORDMCOUNT_FLAGS = -w 295endif 296# Due to recursion, we must skip empty.o. 297# The empty.o file is created in the make process in order to determine 298# the target endianness and word size. It is made before all other C 299# files, including recordmcount. 300sub_cmd_record_mcount = \ 301 if [ $(@) != "scripts/mod/empty.o" ]; then \ 302 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ 303 fi; 304recordmcount_source := $(srctree)/scripts/recordmcount.c \ 305 $(srctree)/scripts/recordmcount.h 306else 307sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ 308 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ 309 "$(if $(CONFIG_64BIT),64,32)" \ 310 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \ 311 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \ 312 "$(if $(part-of-module),1,0)" "$(@)"; 313recordmcount_source := $(srctree)/scripts/recordmcount.pl 314endif 315cmd_record_mcount = \ 316 if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then \ 317 $(sub_cmd_record_mcount) \ 318 fi; 319endif 320 321define rule_cc_o_c 322 $(call echo-cmd,checksrc) $(cmd_checksrc) \ 323 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \ 324 $(cmd_modversions) \ 325 $(call echo-cmd,record_mcount) \ 326 $(cmd_record_mcount) \ 327 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \ 328 $(dot-target).tmp; \ 329 rm -f $(depfile); \ 330 mv -f $(dot-target).tmp $(dot-target).cmd 331endef 332 333# Built-in and composite module parts 334$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE 335 $(call cmd,force_checksrc) 336 $(call if_changed_rule,cc_o_c) 337 338# Single-part modules are special since we need to mark them in $(MODVERDIR) 339 340$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE 341 $(call cmd,force_checksrc) 342 $(call if_changed_rule,cc_o_c) 343 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod) 344 345quiet_cmd_cc_lst_c = MKLST $@ 346 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ 347 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ 348 System.map $(OBJDUMP) > $@ 349 350$(obj)/%.lst: $(src)/%.c FORCE 351 $(call if_changed_dep,cc_lst_c) 352 353# Compile assembler sources (.S) 354# --------------------------------------------------------------------------- 355 356modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) 357 358$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) 359$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) 360 361quiet_cmd_as_s_S = CPP $(quiet_modtag) $@ 362cmd_as_s_S = $(CPP) $(a_flags) -o $@ $< 363 364$(obj)/%.s: $(src)/%.S FORCE 365 $(call if_changed_dep,as_s_S) 366 367quiet_cmd_as_o_S = AS $(quiet_modtag) $@ 368cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< 369 370$(obj)/%.o: $(src)/%.S FORCE 371 $(call if_changed_dep,as_o_S) 372 373targets += $(real-objs-y) $(real-objs-m) $(lib-y) 374targets += $(extra-y) $(MAKECMDGOALS) $(always) 375 376# Linker scripts preprocessor (.lds.S -> .lds) 377# --------------------------------------------------------------------------- 378quiet_cmd_cpp_lds_S = LDS $@ 379 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \ 380 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< 381 382$(obj)/%.lds: $(src)/%.lds.S FORCE 383 $(call if_changed_dep,cpp_lds_S) 384 385# ASN.1 grammar 386# --------------------------------------------------------------------------- 387quiet_cmd_asn1_compiler = ASN.1 $@ 388 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ 389 $(subst .h,.c,$@) $(subst .c,.h,$@) 390 391.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h 392 393$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler 394 $(call cmd,asn1_compiler) 395 396# Build the compiled-in targets 397# --------------------------------------------------------------------------- 398 399# To build objects in subdirs, we need to descend into the directories 400$(sort $(subdir-obj-y)): $(subdir-ym) ; 401 402# 403# Rule to compile a set of .o files into one .o file 404# 405ifdef builtin-target 406quiet_cmd_link_o_target = LD $@ 407# If the list of objects to link is empty, just create an empty built-in.o 408cmd_link_o_target = $(if $(strip $(obj-y)),\ 409 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \ 410 $(cmd_secanalysis),\ 411 rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@) 412 413$(builtin-target): $(obj-y) FORCE 414 $(call if_changed,link_o_target) 415 416targets += $(builtin-target) 417endif # builtin-target 418 419# 420# Rule to create modules.order file 421# 422# Create commands to either record .ko file or cat modules.order from 423# a subdirectory 424modorder-cmds = \ 425 $(foreach m, $(modorder), \ 426 $(if $(filter %/modules.order, $m), \ 427 cat $m;, echo kernel/$m;)) 428 429$(modorder-target): $(subdir-ym) FORCE 430 $(Q)(cat /dev/null; $(modorder-cmds)) > $@ 431 432# 433# Rule to compile a set of .o files into one .a file 434# 435ifdef lib-target 436quiet_cmd_link_l_target = AR $@ 437cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y) 438 439$(lib-target): $(lib-y) FORCE 440 $(call if_changed,link_l_target) 441 442targets += $(lib-target) 443endif 444 445# 446# Rule to link composite objects 447# 448# Composite objects are specified in kbuild makefile as follows: 449# <composite-object>-objs := <list of .o files> 450# or 451# <composite-object>-y := <list of .o files> 452link_multi_deps = \ 453$(filter $(addprefix $(obj)/, \ 454$($(subst $(obj)/,,$(@:.o=-objs))) \ 455$($(subst $(obj)/,,$(@:.o=-y)))), $^) 456 457quiet_cmd_link_multi-y = LD $@ 458cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis) 459 460quiet_cmd_link_multi-m = LD [M] $@ 461cmd_link_multi-m = $(cmd_link_multi-y) 462 463# We would rather have a list of rules like 464# foo.o: $(foo-objs) 465# but that's not so easy, so we rather make all composite objects depend 466# on the set of all their parts 467$(multi-used-y) : %.o: $(multi-objs-y) FORCE 468 $(call if_changed,link_multi-y) 469 470$(multi-used-m) : %.o: $(multi-objs-m) FORCE 471 $(call if_changed,link_multi-m) 472 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) 473 474targets += $(multi-used-y) $(multi-used-m) 475 476 477# Descending 478# --------------------------------------------------------------------------- 479 480PHONY += $(subdir-ym) 481$(subdir-ym): 482 $(Q)$(MAKE) $(build)=$@ 483 484# Add FORCE to the prequisites of a target to force it to be always rebuilt. 485# --------------------------------------------------------------------------- 486 487PHONY += FORCE 488 489FORCE: 490 491# Read all saved command lines and dependencies for the $(targets) we 492# may be building above, using $(if_changed{,_dep}). As an 493# optimization, we don't need to read them if the target does not 494# exist, we will rebuild anyway in that case. 495 496targets := $(wildcard $(sort $(targets))) 497cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 498 499ifneq ($(cmd_files),) 500 include $(cmd_files) 501endif 502 503# Declare the contents of the .PHONY variable as phony. We keep that 504# information in a variable se we can use it in if_changed and friends. 505 506.PHONY: $(PHONY) 507