scripts/Makefile.build

   1 # ==========================================================================
   2 # Building
   3 # ==========================================================================
   4
   5 # Modified for U-Boot
   6 ifeq ($(CONFIG_TPL_BUILD),y)
   7   src := $(patsubst tpl/%,%,$(obj))
   8 else
   9   ifeq ($(CONFIG_SPL_BUILD),y)
  10     src := $(patsubst spl/%,%,$(obj))
  11   else
  12     src := $(obj)
  13   endif
  14 endif
  15
  16 PHONY := __build
  17 __build:
  18
  19 # Init all relevant variables used in kbuild files so
  20 # 1) they have correct type
  21 # 2) they do not inherit any value from the environment
  22 obj-y :=
  23 obj-m :=
  24 lib-y :=
  25 lib-m :=
  26 always :=
  27 targets :=
  28 subdir-y :=
  29 subdir-m :=
  30 EXTRA_AFLAGS   :=
  31 EXTRA_CFLAGS   :=
  32 EXTRA_CPPFLAGS :=
  33 EXTRA_LDFLAGS  :=
  34 asflags-y  :=
  35 ccflags-y  :=
  36 cppflags-y :=
  37 ldflags-y  :=
  38
  39 subdir-asflags-y :=
  40 subdir-ccflags-y :=
  41
  42 # Read auto.conf if it exists, otherwise ignore
  43 -include include/config/auto.conf
  44
  45 # Added for U-Boot: Load U-Boot configuration
  46 ifeq ($(CONFIG_TPL_BUILD),y)
  47   -include include/tpl-autoconf.mk
  48 else
  49   ifeq ($(CONFIG_SPL_BUILD),y)
  50     -include include/spl-autoconf.mk
  51   else
  52     -include include/autoconf.mk
  53   endif
  54 endif
  55
  56 include scripts/Kbuild.include
  57
  58 # Added for U-Boot
  59 # We must include config.mk after Kbuild.include
  60 # so that some config.mk can use cc-option.
  61 include config.mk
  62
  63 # For backward compatibility check that these variables do not change
  64 save-cflags := $(CFLAGS)
  65
  66 # The filename Kbuild has precedence over Makefile
  67 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
  68 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
  69 include $(kbuild-file)
  70
  71 # If the save-* variables changed error out
  72 ifeq ($(KBUILD_NOPEDANTIC),)
  73         ifneq ("$(save-cflags)","$(CFLAGS)")
  74                 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
  75         endif
  76 endif
  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
  87 ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
  88 warning-  := $(empty)
  89
  90 warning-1 := -Wextra -Wunused -Wno-unused-parameter
  91 warning-1 += -Wmissing-declarations
  92 warning-1 += -Wmissing-format-attribute
  93 warning-1 += -Wmissing-prototypes
  94 warning-1 += -Wold-style-definition
  95 warning-1 += $(call cc-option, -Wmissing-include-dirs)
  96 warning-1 += $(call cc-option, -Wunused-but-set-variable)
  97 warning-1 += $(call cc-disable-warning, missing-field-initializers)
  98
  99 warning-2 := -Waggregate-return
 100 warning-2 += -Wcast-align
 101 warning-2 += -Wdisabled-optimization
 102 warning-2 += -Wnested-externs
 103 warning-2 += -Wshadow
 104 warning-2 += $(call cc-option, -Wlogical-op)
 105 warning-2 += $(call cc-option, -Wmissing-field-initializers)
 106
 107 warning-3 := -Wbad-function-cast
 108 warning-3 += -Wcast-qual
 109 warning-3 += -Wconversion
 110 warning-3 += -Wpacked
 111 warning-3 += -Wpadded
 112 warning-3 += -Wpointer-arith
 113 warning-3 += -Wredundant-decls
 114 warning-3 += -Wswitch-default
 115 warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
 116 warning-3 += $(call cc-option, -Wvla)
 117
 118 warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
 119 warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
 120 warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
 121
 122 ifeq ("$(strip $(warning))","")
 123         $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
 124 endif
 125
 126 KBUILD_CFLAGS += $(warning)
 127 endif
 128
 129 include scripts/Makefile.lib
 130
 131 ifdef host-progs
 132 ifneq ($(hostprogs-y),$(host-progs))
 133 $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
 134 hostprogs-y += $(host-progs)
 135 endif
 136 endif
 137
 138 # Do not include host rules unless needed
 139 ifneq ($(hostprogs-y)$(hostprogs-m),)
 140 include scripts/Makefile.host
 141 endif
 142
 143 # Uncommented for U-Boot
 144 #  We need to create output dicrectory for SPL and TPL even for in-tree build
 145 #ifneq ($(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
 154 ifndef obj
 155 $(warning kbuild: Makefile.build is included improperly)
 156 endif
 157
 158 # ===========================================================================
 159
 160 ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
 161 lib-target := $(obj)/lib.a
 162 endif
 163
 164 ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(subdir-m) $(lib-target)),)
 165 builtin-target := $(obj)/built-in.o
 166 endif
 167
 168 modorder-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) $(always)
 175         @:
 176
 177 # Linus' kernel sanity checking tool
 178 ifneq ($(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
 186 endif
 187
 188 # Do section mismatch analysis for each module/built-in.o
 189 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 190   cmd_secanalysis = ; scripts/mod/modpost $@
 191 endif
 192
 193 # Compile C sources (.c)
 194 # ---------------------------------------------------------------------------
 195
 196 # Default is built-in, unless we know otherwise
 197 modkern_cflags =                                          \
 198         $(if $(part-of-module),                           \
 199                 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
 200                 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
 201 quiet_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
 216 modname = $(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
 227 quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
 228 cmd_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
 233 quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
 234 cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
 235
 236 $(obj)/%.i: $(src)/%.c FORCE
 237         $(call if_changed_dep,cc_i_c)
 238
 239 cmd_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
 246 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
 247 cmd_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
 259 quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
 260
 261 ifndef CONFIG_MODVERSIONS
 262 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
 263
 264 else
 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
 277 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
 278 cmd_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) $@;                                      \
 288         fi;
 289 endif
 290
 291 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 292 ifdef BUILD_C_RECORDMCOUNT
 293 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
 294   RECORDMCOUNT_FLAGS = -w
 295 endif
 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.
 300 sub_cmd_record_mcount =                                 \
 301         if [ $(@) != "scripts/mod/empty.o" ]; then      \
 302                 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";   \
 303         fi;
 304 recordmcount_source := $(srctree)/scripts/recordmcount.c \
 305                     $(srctree)/scripts/recordmcount.h
 306 else
 307 sub_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 $(part-of-module),1,0)" "$(@)";
 313 recordmcount_source := $(srctree)/scripts/recordmcount.pl
 314 endif
 315 cmd_record_mcount =                                             \
 316         if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then    \
 317                 $(sub_cmd_record_mcount)                        \
 318         fi;
 319 endif
 320
 321 define 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
 331 endef
 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
 345 quiet_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
 356 modkern_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
 361 quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
 362 cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $<
 363
 364 $(obj)/%.s: $(src)/%.S FORCE
 365         $(call if_changed_dep,as_s_S)
 366
 367 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
 368 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
 369
 370 $(obj)/%.o: $(src)/%.S FORCE
 371         $(call if_changed_dep,as_o_S)
 372
 373 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
 374 targets += $(extra-y) $(MAKECMDGOALS) $(always)
 375
 376 # Linker scripts preprocessor (.lds.S -> .lds)
 377 # ---------------------------------------------------------------------------
 378 quiet_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 # ---------------------------------------------------------------------------
 387 quiet_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 #
 405 ifdef builtin-target
 406 quiet_cmd_link_o_target = LD      $@
 407 # If the list of objects to link is empty, just create an empty built-in.o
 408 cmd_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
 416 targets += $(builtin-target)
 417 endif # 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
 424 modorder-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 #
 435 ifdef lib-target
 436 quiet_cmd_link_l_target = AR      $@
 437 cmd_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
 442 targets += $(lib-target)
 443 endif
 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>
 452 link_multi_deps =                     \
 453 $(filter $(addprefix $(obj)/,         \
 454 $($(subst $(obj)/,,$(@:.o=-objs)))    \
 455 $($(subst $(obj)/,,$(@:.o=-y)))), $^)
 456
 457 quiet_cmd_link_multi-y = LD      $@
 458 cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
 459
 460 quiet_cmd_link_multi-m = LD [M]  $@
 461 cmd_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
 474 targets += $(multi-used-y) $(multi-used-m)
 475
 476
 477 # Descending
 478 # ---------------------------------------------------------------------------
 479
 480 PHONY += $(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
 487 PHONY += FORCE
 488
 489 FORCE:
 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
 496 targets := $(wildcard $(sort $(targets)))
 497 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
 498
 499 ifneq ($(cmd_files),)
 500   include $(cmd_files)
 501 endif
 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)