scripts/Makefile.build

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