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 # For backward compatibility check that these variables do not change
  59 save-cflags := $(CFLAGS)
  60
  61 # The filename Kbuild has precedence over Makefile
  62 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
  63 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
  64 include $(kbuild-file)
  65
  66 # Added for U-Boot
  67 asflags-y  += $(PLATFORM_CPPFLAGS)
  68 ccflags-y  += $(PLATFORM_CPPFLAGS)
  69 cppflags-y += $(PLATFORM_CPPFLAGS)
  70
  71 # If the save-* variables changed error out
  72 ifeq ($(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 += $(call cc-option, -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 # Clang
 100 warning-1 += $(call cc-disable-warning, initializer-overrides)
 101 warning-1 += $(call cc-disable-warning, unused-value)
 102 warning-1 += $(call cc-disable-warning, format)
 103 warning-1 += $(call cc-disable-warning, unknown-warning-option)
 104 warning-1 += $(call cc-disable-warning, sign-compare)
 105 warning-1 += $(call cc-disable-warning, format-zero-length)
 106 warning-1 += $(call cc-disable-warning, uninitialized)
 107 warning-1 += $(call cc-option, -fcatch-undefined-behavior)
 108
 109 warning-2 := -Waggregate-return
 110 warning-2 += -Wcast-align
 111 warning-2 += -Wdisabled-optimization
 112 warning-2 += -Wnested-externs
 113 warning-2 += -Wshadow
 114 warning-2 += $(call cc-option, -Wlogical-op)
 115 warning-2 += $(call cc-option, -Wmissing-field-initializers)
 116
 117 warning-3 := -Wbad-function-cast
 118 warning-3 += -Wcast-qual
 119 warning-3 += -Wconversion
 120 warning-3 += -Wpacked
 121 warning-3 += -Wpadded
 122 warning-3 += -Wpointer-arith
 123 warning-3 += -Wredundant-decls
 124 warning-3 += -Wswitch-default
 125 warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
 126 warning-3 += $(call cc-option, -Wvla)
 127
 128 warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
 129 warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
 130 warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
 131
 132 ifeq ("$(strip $(warning))","")
 133         $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
 134 endif
 135
 136 KBUILD_CFLAGS += $(warning)
 137 endif
 138
 139 include scripts/Makefile.lib
 140
 141 ifdef host-progs
 142 ifneq ($(hostprogs-y),$(host-progs))
 143 $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
 144 hostprogs-y += $(host-progs)
 145 endif
 146 endif
 147
 148 # Do not include host rules unless needed
 149 ifneq ($(hostprogs-y)$(hostprogs-m),)
 150 include scripts/Makefile.host
 151 endif
 152
 153 # Uncommented for U-Boot
 154 #  We need to create output dicrectory for SPL and TPL even for in-tree build
 155 #ifneq ($(KBUILD_SRC),)
 156 # Create output directory if not already present
 157 _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
 158
 159 # Create directories for object files if directory does not exist
 160 # Needed when obj-y := dir/file.o syntax is used
 161 _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
 162 #endif
 163
 164 ifndef obj
 165 $(warning kbuild: Makefile.build is included improperly)
 166 endif
 167
 168 # ===========================================================================
 169
 170 ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
 171 lib-target := $(obj)/lib.a
 172 endif
 173
 174 ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(subdir-m) $(lib-target)),)
 175 builtin-target := $(obj)/built-in.o
 176 endif
 177
 178 modorder-target := $(obj)/modules.order
 179
 180 # We keep a list of all modules in $(MODVERDIR)
 181
 182 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
 183          $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
 184          $(subdir-ym) $(always)
 185         @:
 186
 187 # Linus' kernel sanity checking tool
 188 ifneq ($(KBUILD_CHECKSRC),0)
 189   ifeq ($(KBUILD_CHECKSRC),2)
 190     quiet_cmd_force_checksrc = CHECK   $<
 191           cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
 192   else
 193       quiet_cmd_checksrc     = CHECK   $<
 194             cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
 195   endif
 196 endif
 197
 198 # Do section mismatch analysis for each module/built-in.o
 199 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 200   cmd_secanalysis = ; scripts/mod/modpost $@
 201 endif
 202
 203 # Compile C sources (.c)
 204 # ---------------------------------------------------------------------------
 205
 206 # Default is built-in, unless we know otherwise
 207 modkern_cflags =                                          \
 208         $(if $(part-of-module),                           \
 209                 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
 210                 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
 211 quiet_modtag := $(empty)   $(empty)
 212
 213 $(real-objs-m)        : part-of-module := y
 214 $(real-objs-m:.o=.i)  : part-of-module := y
 215 $(real-objs-m:.o=.s)  : part-of-module := y
 216 $(real-objs-m:.o=.lst): part-of-module := y
 217
 218 $(real-objs-m)        : quiet_modtag := [M]
 219 $(real-objs-m:.o=.i)  : quiet_modtag := [M]
 220 $(real-objs-m:.o=.s)  : quiet_modtag := [M]
 221 $(real-objs-m:.o=.lst): quiet_modtag := [M]
 222
 223 $(obj-m)              : quiet_modtag := [M]
 224
 225 # Default for not multi-part modules
 226 modname = $(basetarget)
 227
 228 $(multi-objs-m)         : modname = $(modname-multi)
 229 $(multi-objs-m:.o=.i)   : modname = $(modname-multi)
 230 $(multi-objs-m:.o=.s)   : modname = $(modname-multi)
 231 $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
 232 $(multi-objs-y)         : modname = $(modname-multi)
 233 $(multi-objs-y:.o=.i)   : modname = $(modname-multi)
 234 $(multi-objs-y:.o=.s)   : modname = $(modname-multi)
 235 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
 236
 237 quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
 238 cmd_cc_s_c       = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
 239
 240 $(obj)/%.s: $(src)/%.c FORCE
 241         $(call if_changed_dep,cc_s_c)
 242
 243 quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
 244 cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
 245
 246 $(obj)/%.i: $(src)/%.c FORCE
 247         $(call if_changed_dep,cc_i_c)
 248
 249 cmd_gensymtypes =                                                           \
 250     $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
 251     $(GENKSYMS) $(if $(1), -T $(2))                                         \
 252      $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
 253      $(if $(KBUILD_PRESERVE),-p)                                            \
 254      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
 255
 256 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
 257 cmd_cc_symtypes_c =                                                         \
 258     set -e;                                                                 \
 259     $(call cmd_gensymtypes,true,$@) >/dev/null;                             \
 260     test -s $@ || rm -f $@
 261
 262 $(obj)/%.symtypes : $(src)/%.c FORCE
 263         $(call cmd,cc_symtypes_c)
 264
 265 # C (.c) files
 266 # The C file is compiled and updated dependency information is generated.
 267 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
 268
 269 quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
 270
 271 ifndef CONFIG_MODVERSIONS
 272 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
 273
 274 else
 275 # When module versioning is enabled the following steps are executed:
 276 # o compile a .tmp_<file>.o from <file>.c
 277 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
 278 #   not export symbols, we just rename .tmp_<file>.o to <file>.o and
 279 #   are done.
 280 # o otherwise, we calculate symbol versions using the good old
 281 #   genksyms on the preprocessed source and postprocess them in a way
 282 #   that they are usable as a linker script
 283 # o generate <file>.o from .tmp_<file>.o using the linker to
 284 #   replace the unresolved symbols __crc_exported_symbol with
 285 #   the actual value of the checksum generated by genksyms
 286
 287 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
 288 cmd_modversions =                                                               \
 289         if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
 290                 $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))    \
 291                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
 292                                                                                 \
 293                 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)                      \
 294                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
 295                 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
 296         else                                                                    \
 297                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
 298         fi;
 299 endif
 300
 301 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 302 ifdef BUILD_C_RECORDMCOUNT
 303 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
 304   RECORDMCOUNT_FLAGS = -w
 305 endif
 306 # Due to recursion, we must skip empty.o.
 307 # The empty.o file is created in the make process in order to determine
 308 #  the target endianness and word size. It is made before all other C
 309 #  files, including recordmcount.
 310 sub_cmd_record_mcount =                                 \
 311         if [ $(@) != "scripts/mod/empty.o" ]; then      \
 312                 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";   \
 313         fi;
 314 recordmcount_source := $(srctree)/scripts/recordmcount.c \
 315                     $(srctree)/scripts/recordmcount.h
 316 else
 317 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
 318         "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
 319         "$(if $(CONFIG_64BIT),64,32)" \
 320         "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
 321         "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
 322         "$(if $(part-of-module),1,0)" "$(@)";
 323 recordmcount_source := $(srctree)/scripts/recordmcount.pl
 324 endif
 325 cmd_record_mcount =                                             \
 326         if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then    \
 327                 $(sub_cmd_record_mcount)                        \
 328         fi;
 329 endif
 330
 331 define rule_cc_o_c
 332         $(call echo-cmd,checksrc) $(cmd_checksrc)                         \
 333         $(call echo-cmd,cc_o_c) $(cmd_cc_o_c);                            \
 334         $(cmd_modversions)                                                \
 335         $(call echo-cmd,record_mcount)                                    \
 336         $(cmd_record_mcount)                                              \
 337         scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' >    \
 338                                                       $(dot-target).tmp;  \
 339         rm -f $(depfile);                                                 \
 340         mv -f $(dot-target).tmp $(dot-target).cmd
 341 endef
 342
 343 # Built-in and composite module parts
 344 $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
 345         $(call cmd,force_checksrc)
 346         $(call if_changed_rule,cc_o_c)
 347
 348 # Single-part modules are special since we need to mark them in $(MODVERDIR)
 349
 350 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
 351         $(call cmd,force_checksrc)
 352         $(call if_changed_rule,cc_o_c)
 353         @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
 354
 355 quiet_cmd_cc_lst_c = MKLST   $@
 356       cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
 357                      $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
 358                                      System.map $(OBJDUMP) > $@
 359
 360 $(obj)/%.lst: $(src)/%.c FORCE
 361         $(call if_changed_dep,cc_lst_c)
 362
 363 # Compile assembler sources (.S)
 364 # ---------------------------------------------------------------------------
 365
 366 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
 367
 368 $(real-objs-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
 369 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
 370
 371 quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
 372 cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $<
 373
 374 $(obj)/%.s: $(src)/%.S FORCE
 375         $(call if_changed_dep,as_s_S)
 376
 377 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
 378 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
 379
 380 $(obj)/%.o: $(src)/%.S FORCE
 381         $(call if_changed_dep,as_o_S)
 382
 383 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
 384 targets += $(extra-y) $(MAKECMDGOALS) $(always)
 385
 386 # Linker scripts preprocessor (.lds.S -> .lds)
 387 # ---------------------------------------------------------------------------
 388 quiet_cmd_cpp_lds_S = LDS     $@
 389       cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
 390                              -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
 391
 392 $(obj)/%.lds: $(src)/%.lds.S FORCE
 393         $(call if_changed_dep,cpp_lds_S)
 394
 395 # ASN.1 grammar
 396 # ---------------------------------------------------------------------------
 397 quiet_cmd_asn1_compiler = ASN.1   $@
 398       cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
 399                                 $(subst .h,.c,$@) $(subst .c,.h,$@)
 400
 401 .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
 402
 403 $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
 404         $(call cmd,asn1_compiler)
 405
 406 # Build the compiled-in targets
 407 # ---------------------------------------------------------------------------
 408
 409 # To build objects in subdirs, we need to descend into the directories
 410 $(sort $(subdir-obj-y)): $(subdir-ym) ;
 411
 412 #
 413 # Rule to compile a set of .o files into one .o file
 414 #
 415 ifdef builtin-target
 416 quiet_cmd_link_o_target = LD      $@
 417 # If the list of objects to link is empty, just create an empty built-in.o
 418 cmd_link_o_target = $(if $(strip $(obj-y)),\
 419                       $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
 420                       $(cmd_secanalysis),\
 421                       rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
 422
 423 $(builtin-target): $(obj-y) FORCE
 424         $(call if_changed,link_o_target)
 425
 426 targets += $(builtin-target)
 427 endif # builtin-target
 428
 429 #
 430 # Rule to create modules.order file
 431 #
 432 # Create commands to either record .ko file or cat modules.order from
 433 # a subdirectory
 434 modorder-cmds =                                         \
 435         $(foreach m, $(modorder),                       \
 436                 $(if $(filter %/modules.order, $m),     \
 437                         cat $m;, echo kernel/$m;))
 438
 439 $(modorder-target): $(subdir-ym) FORCE
 440         $(Q)(cat /dev/null; $(modorder-cmds)) > $@
 441
 442 #
 443 # Rule to compile a set of .o files into one .a file
 444 #
 445 ifdef lib-target
 446 quiet_cmd_link_l_target = AR      $@
 447 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
 448
 449 $(lib-target): $(lib-y) FORCE
 450         $(call if_changed,link_l_target)
 451
 452 targets += $(lib-target)
 453 endif
 454
 455 #
 456 # Rule to link composite objects
 457 #
 458 #  Composite objects are specified in kbuild makefile as follows:
 459 #    <composite-object>-objs := <list of .o files>
 460 #  or
 461 #    <composite-object>-y    := <list of .o files>
 462 link_multi_deps =                     \
 463 $(filter $(addprefix $(obj)/,         \
 464 $($(subst $(obj)/,,$(@:.o=-objs)))    \
 465 $($(subst $(obj)/,,$(@:.o=-y)))), $^)
 466
 467 quiet_cmd_link_multi-y = LD      $@
 468 cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
 469
 470 quiet_cmd_link_multi-m = LD [M]  $@
 471 cmd_link_multi-m = $(cmd_link_multi-y)
 472
 473 # We would rather have a list of rules like
 474 #       foo.o: $(foo-objs)
 475 # but that's not so easy, so we rather make all composite objects depend
 476 # on the set of all their parts
 477 $(multi-used-y) : %.o: $(multi-objs-y) FORCE
 478         $(call if_changed,link_multi-y)
 479
 480 $(multi-used-m) : %.o: $(multi-objs-m) FORCE
 481         $(call if_changed,link_multi-m)
 482         @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
 483
 484 targets += $(multi-used-y) $(multi-used-m)
 485
 486
 487 # Descending
 488 # ---------------------------------------------------------------------------
 489
 490 PHONY += $(subdir-ym)
 491 $(subdir-ym):
 492         $(Q)$(MAKE) $(build)=$@
 493
 494 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
 495 # ---------------------------------------------------------------------------
 496
 497 PHONY += FORCE
 498
 499 FORCE:
 500
 501 # Read all saved command lines and dependencies for the $(targets) we
 502 # may be building above, using $(if_changed{,_dep}). As an
 503 # optimization, we don't need to read them if the target does not
 504 # exist, we will rebuild anyway in that case.
 505
 506 targets := $(wildcard $(sort $(targets)))
 507 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
 508
 509 ifneq ($(cmd_files),)
 510   include $(cmd_files)
 511 endif
 512
 513 # Declare the contents of the .PHONY variable as phony.  We keep that
 514 # information in a variable se we can use it in if_changed and friends.
 515
 516 .PHONY: $(PHONY)