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)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
  64 include scripts/Makefile.host
  65 endif
  66
  67 ifneq ($(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 obj-y += $(obj)/lib-ksyms.o
  85 endif
  86
  87 ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
  88 builtin-target := $(obj)/built-in.o
  89 endif
  90
  91 modorder-target := $(obj)/modules.order
  92
  93 # We keep a list of all modules in $(MODVERDIR)
  94
  95 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
  96          $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
  97          $(subdir-ym) $(always)
  98         @:
  99
 100 # Linus' kernel sanity checking tool
 101 ifneq ($(KBUILD_CHECKSRC),0)
 102   ifeq ($(KBUILD_CHECKSRC),2)
 103     quiet_cmd_force_checksrc = CHECK   $<
 104           cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
 105   else
 106       quiet_cmd_checksrc     = CHECK   $<
 107             cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
 108   endif
 109 endif
 110
 111 # Do section mismatch analysis for each module/built-in.o
 112 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 113   cmd_secanalysis = ; scripts/mod/modpost $@
 114 endif
 115
 116 # Compile C sources (.c)
 117 # ---------------------------------------------------------------------------
 118
 119 # Default is built-in, unless we know otherwise
 120 modkern_cflags =                                          \
 121         $(if $(part-of-module),                           \
 122                 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
 123                 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
 124 quiet_modtag := $(empty)   $(empty)
 125
 126 $(real-objs-m)        : part-of-module := y
 127 $(real-objs-m:.o=.i)  : part-of-module := y
 128 $(real-objs-m:.o=.s)  : part-of-module := y
 129 $(real-objs-m:.o=.lst): part-of-module := y
 130
 131 $(real-objs-m)        : quiet_modtag := [M]
 132 $(real-objs-m:.o=.i)  : quiet_modtag := [M]
 133 $(real-objs-m:.o=.s)  : quiet_modtag := [M]
 134 $(real-objs-m:.o=.lst): quiet_modtag := [M]
 135
 136 $(obj-m)              : quiet_modtag := [M]
 137
 138 # Default for not multi-part modules
 139 modname = $(basetarget)
 140
 141 $(multi-objs-m)         : modname = $(modname-multi)
 142 $(multi-objs-m:.o=.i)   : modname = $(modname-multi)
 143 $(multi-objs-m:.o=.s)   : modname = $(modname-multi)
 144 $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
 145 $(multi-objs-y)         : modname = $(modname-multi)
 146 $(multi-objs-y:.o=.i)   : modname = $(modname-multi)
 147 $(multi-objs-y:.o=.s)   : modname = $(modname-multi)
 148 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
 149
 150 quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
 151 cmd_cc_s_c       = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
 152
 153 $(obj)/%.s: $(src)/%.c FORCE
 154         $(call if_changed_dep,cc_s_c)
 155
 156 quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
 157 cmd_cpp_i_c       = $(CPP) $(c_flags) -o $@ $<
 158
 159 $(obj)/%.i: $(src)/%.c FORCE
 160         $(call if_changed_dep,cpp_i_c)
 161
 162 # These mirror gensymtypes_S and co below, keep them in synch.
 163 cmd_gensymtypes_c =                                                         \
 164     $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
 165     $(GENKSYMS) $(if $(1), -T $(2))                                         \
 166      $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
 167      $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS))                             \
 168      $(if $(KBUILD_PRESERVE),-p)                                            \
 169      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
 170
 171 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
 172 cmd_cc_symtypes_c =                                                         \
 173     set -e;                                                                 \
 174     $(call cmd_gensymtypes_c,true,$@) >/dev/null;                           \
 175     test -s $@ || rm -f $@
 176
 177 $(obj)/%.symtypes : $(src)/%.c FORCE
 178         $(call cmd,cc_symtypes_c)
 179
 180 # LLVM assembly
 181 # Generate .ll files from .c
 182 quiet_cmd_cc_ll_c = CC $(quiet_modtag)  $@
 183       cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
 184
 185 $(obj)/%.ll: $(src)/%.c FORCE
 186         $(call if_changed_dep,cc_ll_c)
 187
 188 # C (.c) files
 189 # The C file is compiled and updated dependency information is generated.
 190 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
 191
 192 quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
 193
 194 ifndef CONFIG_MODVERSIONS
 195 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
 196
 197 else
 198 # When module versioning is enabled the following steps are executed:
 199 # o compile a .tmp_<file>.o from <file>.c
 200 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
 201 #   not export symbols, we just rename .tmp_<file>.o to <file>.o and
 202 #   are done.
 203 # o otherwise, we calculate symbol versions using the good old
 204 #   genksyms on the preprocessed source and postprocess them in a way
 205 #   that they are usable as a linker script
 206 # o generate <file>.o from .tmp_<file>.o using the linker to
 207 #   replace the unresolved symbols __crc_exported_symbol with
 208 #   the actual value of the checksum generated by genksyms
 209
 210 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
 211
 212 cmd_modversions_c =                                                             \
 213         if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
 214                 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))  \
 215                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
 216                                                                                 \
 217                 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)                      \
 218                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
 219                 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
 220         else                                                                    \
 221                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
 222         fi;
 223 endif
 224
 225 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 226 ifdef BUILD_C_RECORDMCOUNT
 227 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
 228   RECORDMCOUNT_FLAGS = -w
 229 endif
 230 # Due to recursion, we must skip empty.o.
 231 # The empty.o file is created in the make process in order to determine
 232 # the target endianness and word size. It is made before all other C
 233 # files, including recordmcount.
 234 sub_cmd_record_mcount =                                 \
 235         if [ $(@) != "scripts/mod/empty.o" ]; then      \
 236                 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";   \
 237         fi;
 238 recordmcount_source := $(srctree)/scripts/recordmcount.c \
 239                     $(srctree)/scripts/recordmcount.h
 240 else
 241 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
 242         "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
 243         "$(if $(CONFIG_64BIT),64,32)" \
 244         "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
 245         "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
 246         "$(if $(part-of-module),1,0)" "$(@)";
 247 recordmcount_source := $(srctree)/scripts/recordmcount.pl
 248 endif # BUILD_C_RECORDMCOUNT
 249 cmd_record_mcount =                                             \
 250         if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" =   \
 251              "$(CC_FLAGS_FTRACE)" ]; then                       \
 252                 $(sub_cmd_record_mcount)                        \
 253         fi;
 254 endif # CONFIG_FTRACE_MCOUNT_RECORD
 255
 256 ifdef CONFIG_STACK_VALIDATION
 257 ifneq ($(SKIP_STACK_VALIDATION),1)
 258
 259 __objtool_obj := $(objtree)/tools/objtool/objtool
 260
 261 objtool_args = check
 262 ifndef CONFIG_FRAME_POINTER
 263 objtool_args += --no-fp
 264 endif
 265
 266 # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
 267 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
 268 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
 269 cmd_objtool = $(if $(patsubst y%,, \
 270         $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
 271         $(__objtool_obj) $(objtool_args) "$(@)";)
 272 objtool_obj = $(if $(patsubst y%,, \
 273         $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
 274         $(__objtool_obj))
 275
 276 endif # SKIP_STACK_VALIDATION
 277 endif # CONFIG_STACK_VALIDATION
 278
 279 define rule_cc_o_c
 280         $(call echo-cmd,checksrc) $(cmd_checksrc)                         \
 281         $(call cmd_and_fixdep,cc_o_c)                                     \
 282         $(cmd_modversions_c)                                              \
 283         $(call echo-cmd,objtool) $(cmd_objtool)                           \
 284         $(call echo-cmd,record_mcount) $(cmd_record_mcount)
 285 endef
 286
 287 define rule_as_o_S
 288         $(call cmd_and_fixdep,as_o_S)                                     \
 289         $(cmd_modversions_S)                                              \
 290         $(call echo-cmd,objtool) $(cmd_objtool)
 291 endef
 292
 293 # List module undefined symbols (or empty line if not enabled)
 294 ifdef CONFIG_TRIM_UNUSED_KSYMS
 295 cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo
 296 else
 297 cmd_undef_syms = echo
 298 endif
 299
 300 # Built-in and composite module parts
 301 $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
 302         $(call cmd,force_checksrc)
 303         $(call if_changed_rule,cc_o_c)
 304
 305 # Single-part modules are special since we need to mark them in $(MODVERDIR)
 306
 307 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
 308         $(call cmd,force_checksrc)
 309         $(call if_changed_rule,cc_o_c)
 310         @{ echo $(@:.o=.ko); echo $@; \
 311            $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
 312
 313 quiet_cmd_cc_lst_c = MKLST   $@
 314       cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
 315                      $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
 316                                      System.map $(OBJDUMP) > $@
 317
 318 $(obj)/%.lst: $(src)/%.c FORCE
 319         $(call if_changed_dep,cc_lst_c)
 320
 321 # Compile assembler sources (.S)
 322 # ---------------------------------------------------------------------------
 323
 324 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
 325
 326 $(real-objs-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
 327 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
 328
 329 # .S file exports must have their C prototypes defined in asm/asm-prototypes.h
 330 # or a file that it includes, in order to get versioned symbols. We build a
 331 # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
 332 # the .S file (with trailing ';'), and run genksyms on that, to extract vers.
 333 #
 334 # This is convoluted. The .S file must first be preprocessed to run guards and
 335 # expand names, then the resulting exports must be constructed into plain
 336 # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
 337 # to make the genksyms input.
 338 #
 339 # These mirror gensymtypes_c and co above, keep them in synch.
 340 cmd_gensymtypes_S =                                                         \
 341     (echo "\#include <linux/kernel.h>" ;                                    \
 342      echo "\#include <asm/asm-prototypes.h>" ;                              \
 343     $(CPP) $(a_flags) $< |                                                  \
 344      grep "\<___EXPORT_SYMBOL\>" |                                          \
 345      sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
 346     $(CPP) -D__GENKSYMS__ $(c_flags) -xc - |                                \
 347     $(GENKSYMS) $(if $(1), -T $(2))                                         \
 348      $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
 349      $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS))                             \
 350      $(if $(KBUILD_PRESERVE),-p)                                            \
 351      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
 352
 353 quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
 354 cmd_cc_symtypes_S =                                                         \
 355     set -e;                                                                 \
 356     $(call cmd_gensymtypes_S,true,$@) >/dev/null;                           \
 357     test -s $@ || rm -f $@
 358
 359 $(obj)/%.symtypes : $(src)/%.S FORCE
 360         $(call cmd,cc_symtypes_S)
 361
 362
 363 quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
 364 cmd_cpp_s_S       = $(CPP) $(a_flags) -o $@ $<
 365
 366 $(obj)/%.s: $(src)/%.S FORCE
 367         $(call if_changed_dep,cpp_s_S)
 368
 369 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
 370
 371 ifndef CONFIG_MODVERSIONS
 372 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
 373
 374 else
 375
 376 ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
 377
 378 ifeq ($(ASM_PROTOTYPES),)
 379 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
 380
 381 else
 382
 383 # versioning matches the C process described above, with difference that
 384 # we parse asm-prototypes.h C header to get function definitions.
 385
 386 cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
 387
 388 cmd_modversions_S =                                                             \
 389         if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
 390                 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))  \
 391                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
 392                                                                                 \
 393                 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)                      \
 394                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
 395                 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
 396         else                                                                    \
 397                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
 398         fi;
 399 endif
 400 endif
 401
 402 $(obj)/%.o: $(src)/%.S $(objtool_obj) FORCE
 403         $(call if_changed_rule,as_o_S)
 404
 405 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
 406 targets += $(extra-y) $(MAKECMDGOALS) $(always)
 407
 408 # Linker scripts preprocessor (.lds.S -> .lds)
 409 # ---------------------------------------------------------------------------
 410 quiet_cmd_cpp_lds_S = LDS     $@
 411       cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
 412                              -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
 413
 414 $(obj)/%.lds: $(src)/%.lds.S FORCE
 415         $(call if_changed_dep,cpp_lds_S)
 416
 417 # ASN.1 grammar
 418 # ---------------------------------------------------------------------------
 419 quiet_cmd_asn1_compiler = ASN.1   $@
 420       cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
 421                                 $(subst .h,.c,$@) $(subst .c,.h,$@)
 422
 423 .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
 424
 425 $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
 426         $(call cmd,asn1_compiler)
 427
 428 # Build the compiled-in targets
 429 # ---------------------------------------------------------------------------
 430
 431 # To build objects in subdirs, we need to descend into the directories
 432 $(sort $(subdir-obj-y)): $(subdir-ym) ;
 433
 434 #
 435 # Rule to compile a set of .o files into one .o file
 436 #
 437 ifdef builtin-target
 438
 439 ifdef CONFIG_THIN_ARCHIVES
 440   cmd_make_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
 441   cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
 442   quiet_cmd_link_o_target = AR      $@
 443 else
 444   cmd_make_builtin = $(LD) $(ld_flags) -r -o
 445   cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
 446   quiet_cmd_link_o_target = LD      $@
 447 endif
 448
 449 # If the list of objects to link is empty, just create an empty built-in.o
 450 cmd_link_o_target = $(if $(strip $(obj-y)),\
 451                       $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
 452                       $(cmd_secanalysis),\
 453                       $(cmd_make_empty_builtin) $@)
 454
 455 $(builtin-target): $(obj-y) FORCE
 456         $(call if_changed,link_o_target)
 457
 458 targets += $(builtin-target)
 459 endif # builtin-target
 460
 461 #
 462 # Rule to create modules.order file
 463 #
 464 # Create commands to either record .ko file or cat modules.order from
 465 # a subdirectory
 466 modorder-cmds =                                         \
 467         $(foreach m, $(modorder),                       \
 468                 $(if $(filter %/modules.order, $m),     \
 469                         cat $m;, echo kernel/$m;))
 470
 471 $(modorder-target): $(subdir-ym) FORCE
 472         $(Q)(cat /dev/null; $(modorder-cmds)) > $@
 473
 474 #
 475 # Rule to compile a set of .o files into one .a file
 476 #
 477 ifdef lib-target
 478 quiet_cmd_link_l_target = AR      $@
 479
 480 ifdef CONFIG_THIN_ARCHIVES
 481   cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y)
 482 else
 483   cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
 484 endif
 485
 486 $(lib-target): $(lib-y) FORCE
 487         $(call if_changed,link_l_target)
 488
 489 targets += $(lib-target)
 490
 491 dummy-object = $(obj)/.lib_exports.o
 492 ksyms-lds = $(dot-target).lds
 493 ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
 494 ref_prefix = EXTERN(_
 495 else
 496 ref_prefix = EXTERN(
 497 endif
 498
 499 quiet_cmd_export_list = EXPORTS $@
 500 cmd_export_list = $(OBJDUMP) -h $< | \
 501         sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(ksyms-lds);\
 502         rm -f $(dummy-object);\
 503         echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
 504         $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
 505         rm $(dummy-object) $(ksyms-lds)
 506
 507 $(obj)/lib-ksyms.o: $(lib-target) FORCE
 508         $(call if_changed,export_list)
 509
 510 targets += $(obj)/lib-ksyms.o
 511
 512 endif
 513
 514 #
 515 # Rule to link composite objects
 516 #
 517 #  Composite objects are specified in kbuild makefile as follows:
 518 #    <composite-object>-objs := <list of .o files>
 519 #  or
 520 #    <composite-object>-y    := <list of .o files>
 521 #  or
 522 #    <composite-object>-m    := <list of .o files>
 523 #  The -m syntax only works if <composite object> is a module
 524 link_multi_deps =                     \
 525 $(filter $(addprefix $(obj)/,         \
 526 $($(subst $(obj)/,,$(@:.o=-objs)))    \
 527 $($(subst $(obj)/,,$(@:.o=-y)))       \
 528 $($(subst $(obj)/,,$(@:.o=-m)))), $^)
 529
 530 cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
 531
 532 ifdef CONFIG_THIN_ARCHIVES
 533   quiet_cmd_link_multi-y = AR      $@
 534   cmd_link_multi-y = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps)
 535 else
 536   quiet_cmd_link_multi-y = LD      $@
 537   cmd_link_multi-y = $(cmd_link_multi-link)
 538 endif
 539
 540 quiet_cmd_link_multi-m = LD [M]  $@
 541 cmd_link_multi-m = $(cmd_link_multi-link)
 542
 543 $(multi-used-y): FORCE
 544         $(call if_changed,link_multi-y)
 545 $(call multi_depend, $(multi-used-y), .o, -objs -y)
 546
 547 $(multi-used-m): FORCE
 548         $(call if_changed,link_multi-m)
 549         @{ echo $(@:.o=.ko); echo $(link_multi_deps); \
 550            $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
 551 $(call multi_depend, $(multi-used-m), .o, -objs -y -m)
 552
 553 targets += $(multi-used-y) $(multi-used-m)
 554
 555
 556 # Descending
 557 # ---------------------------------------------------------------------------
 558
 559 PHONY += $(subdir-ym)
 560 $(subdir-ym):
 561         $(Q)$(MAKE) $(build)=$@
 562
 563 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
 564 # ---------------------------------------------------------------------------
 565
 566 PHONY += FORCE
 567
 568 FORCE:
 569
 570 # Read all saved command lines and dependencies for the $(targets) we
 571 # may be building above, using $(if_changed{,_dep}). As an
 572 # optimization, we don't need to read them if the target does not
 573 # exist, we will rebuild anyway in that case.
 574
 575 targets := $(wildcard $(sort $(targets)))
 576 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
 577
 578 ifneq ($(cmd_files),)
 579   include $(cmd_files)
 580 endif
 581
 582 # Declare the contents of the .PHONY variable as phony.  We keep that
 583 # information in a variable se we can use it in if_changed and friends.
 584
 585 .PHONY: $(PHONY)