arch/powerpc/Makefile

   1 # This file is included by the global makefile so that you can add your own
   2 # architecture-specific flags and dependencies. Remember to do have actions
   3 # for "archclean" and "archdep" for cleaning up and making dependencies for
   4 # this architecture.
   5 #
   6 # This file is subject to the terms and conditions of the GNU General Public
   7 # License.  See the file "COPYING" in the main directory of this archive
   8 # for more details.
   9 #
  10 # Copyright (C) 1994 by Linus Torvalds
  11 # Changes for PPC by Gary Thomas
  12 # Rewritten by Cort Dougan and Paul Mackerras
  13 #
  14
  15 HAS_BIARCH      := $(call cc-option-yn, -m32)
  16
  17 # Set default 32 bits cross compilers for vdso and boot wrapper
  18 CROSS32_COMPILE ?=
  19
  20 ifeq ($(HAS_BIARCH),y)
  21 ifeq ($(CROSS32_COMPILE),)
  22 ifdef CONFIG_PPC32
  23 # These options will be overridden by any -mcpu option that the CPU
  24 # or platform code sets later on the command line, but they are needed
  25 # to set a sane 32-bit cpu target for the 64-bit cross compiler which
  26 # may default to the wrong ISA.
  27 KBUILD_CFLAGS           += -mcpu=powerpc
  28 KBUILD_AFLAGS           += -mcpu=powerpc
  29 endif
  30 endif
  31 endif
  32
  33 ifdef CONFIG_PPC_BOOK3S_32
  34 KBUILD_CFLAGS           += -mcpu=powerpc
  35 endif
  36
  37 # If we're on a ppc/ppc64/ppc64le machine use that defconfig, otherwise just use
  38 # ppc64_defconfig because we have nothing better to go on.
  39 uname := $(shell uname -m)
  40 KBUILD_DEFCONFIG := $(if $(filter ppc%,$(uname)),$(uname),ppc64)_defconfig
  41
  42 new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
  43
  44 ifeq ($(new_nm),y)
  45 NM              := $(NM) --synthetic
  46 endif
  47
  48 # BITS is used as extension for files which are available in a 32 bit
  49 # and a 64 bit version to simplify shared Makefiles.
  50 # e.g.: obj-y += foo_$(BITS).o
  51 export BITS
  52
  53 ifdef CONFIG_PPC64
  54         BITS := 64
  55 else
  56         BITS := 32
  57 endif
  58
  59 machine-y = ppc
  60 machine-$(CONFIG_PPC64) += 64
  61 machine-$(CONFIG_CPU_LITTLE_ENDIAN) += le
  62 UTS_MACHINE := $(subst $(space),,$(machine-y))
  63
  64 # XXX This needs to be before we override LD below
  65 ifdef CONFIG_PPC32
  66 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
  67 else
  68 ifeq ($(call ld-ifversion, -ge, 225000000, y),y)
  69 # Have the linker provide sfpr if possible.
  70 # There is a corresponding test in arch/powerpc/lib/Makefile
  71 KBUILD_LDFLAGS_MODULE += --save-restore-funcs
  72 else
  73 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
  74 endif
  75 endif
  76
  77 ifdef CONFIG_CPU_LITTLE_ENDIAN
  78 KBUILD_CFLAGS   += -mlittle-endian
  79 KBUILD_LDFLAGS  += -EL
  80 LDEMULATION     := lppc
  81 GNUTARGET       := powerpcle
  82 MULTIPLEWORD    := -mno-multiple
  83 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
  84 else
  85 KBUILD_CFLAGS += $(call cc-option,-mbig-endian)
  86 KBUILD_LDFLAGS  += -EB
  87 LDEMULATION     := ppc
  88 GNUTARGET       := powerpc
  89 MULTIPLEWORD    := -mmultiple
  90 endif
  91
  92 ifdef CONFIG_PPC64
  93 ifndef CONFIG_CC_IS_CLANG
  94 cflags-$(CONFIG_CPU_BIG_ENDIAN)         += $(call cc-option,-mabi=elfv1)
  95 cflags-$(CONFIG_CPU_BIG_ENDIAN)         += $(call cc-option,-mcall-aixdesc)
  96 aflags-$(CONFIG_CPU_BIG_ENDIAN)         += $(call cc-option,-mabi=elfv1)
  97 aflags-$(CONFIG_CPU_LITTLE_ENDIAN)      += -mabi=elfv2
  98 endif
  99 endif
 100
 101 ifndef CONFIG_CC_IS_CLANG
 102   cflags-$(CONFIG_CPU_LITTLE_ENDIAN)    += -mno-strict-align
 103 endif
 104
 105 cflags-$(CONFIG_CPU_BIG_ENDIAN)         += $(call cc-option,-mbig-endian)
 106 cflags-$(CONFIG_CPU_LITTLE_ENDIAN)      += -mlittle-endian
 107 aflags-$(CONFIG_CPU_BIG_ENDIAN)         += $(call cc-option,-mbig-endian)
 108 aflags-$(CONFIG_CPU_LITTLE_ENDIAN)      += -mlittle-endian
 109
 110 ifeq ($(HAS_BIARCH),y)
 111 KBUILD_CFLAGS   += -m$(BITS)
 112 KBUILD_AFLAGS   += -m$(BITS) -Wl,-a$(BITS)
 113 KBUILD_LDFLAGS  += -m elf$(BITS)$(LDEMULATION)
 114 endif
 115
 116 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard=tls
 117 ifdef CONFIG_PPC64
 118 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r13
 119 else
 120 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2
 121 endif
 122
 123 LDFLAGS_vmlinux-y := -Bstatic
 124 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
 125 LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
 126
 127 ifdef CONFIG_PPC64
 128 ifeq ($(call cc-option-yn,-mcmodel=medium),y)
 129         # -mcmodel=medium breaks modules because it uses 32bit offsets from
 130         # the TOC pointer to create pointers where possible. Pointers into the
 131         # percpu data area are created by this method.
 132         #
 133         # The kernel module loader relocates the percpu data section from the
 134         # original location (starting with 0xd...) to somewhere in the base
 135         # kernel percpu data space (starting with 0xc...). We need a full
 136         # 64bit relocation for this to work, hence -mcmodel=large.
 137         KBUILD_CFLAGS_MODULE += -mcmodel=large
 138 else
 139         export NO_MINIMAL_TOC := -mno-minimal-toc
 140 endif
 141 endif
 142
 143 CFLAGS-$(CONFIG_PPC64)  := $(call cc-option,-mtraceback=no)
 144 ifndef CONFIG_CC_IS_CLANG
 145 ifdef CONFIG_CPU_LITTLE_ENDIAN
 146 CFLAGS-$(CONFIG_PPC64)  += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
 147 AFLAGS-$(CONFIG_PPC64)  += $(call cc-option,-mabi=elfv2)
 148 else
 149 CFLAGS-$(CONFIG_PPC64)  += $(call cc-option,-mabi=elfv1)
 150 CFLAGS-$(CONFIG_PPC64)  += $(call cc-option,-mcall-aixdesc)
 151 AFLAGS-$(CONFIG_PPC64)  += $(call cc-option,-mabi=elfv1)
 152 endif
 153 endif
 154 CFLAGS-$(CONFIG_PPC64)  += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
 155 CFLAGS-$(CONFIG_PPC64)  += $(call cc-option,-mno-pointers-to-nested-functions)
 156
 157 # Clang unconditionally reserves r2 on ppc32 and does not support the flag
 158 # https://bugs.llvm.org/show_bug.cgi?id=39555
 159 CFLAGS-$(CONFIG_PPC32)  := $(call cc-option, -ffixed-r2)
 160
 161 # Clang doesn't support -mmultiple / -mno-multiple
 162 # https://bugs.llvm.org/show_bug.cgi?id=39556
 163 CFLAGS-$(CONFIG_PPC32)  += $(call cc-option, $(MULTIPLEWORD))
 164
 165 CFLAGS-$(CONFIG_PPC32)  += $(call cc-option,-mno-readonly-in-sdata)
 166
 167 ifdef CONFIG_PPC_BOOK3S_64
 168 ifdef CONFIG_CPU_LITTLE_ENDIAN
 169 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8
 170 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power9,-mtune=power8)
 171 else
 172 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5))
 173 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mcpu=power5,-mcpu=power4)
 174 endif
 175 else
 176 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
 177 endif
 178
 179 ifdef CONFIG_FUNCTION_TRACER
 180 CC_FLAGS_FTRACE := -pg
 181 ifdef CONFIG_MPROFILE_KERNEL
 182 CC_FLAGS_FTRACE += -mprofile-kernel
 183 endif
 184 # Work around gcc code-gen bugs with -pg / -fno-omit-frame-pointer in gcc <= 4.8
 185 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44199
 186 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52828
 187 ifndef CONFIG_CC_IS_CLANG
 188 CC_FLAGS_FTRACE += $(call cc-ifversion, -lt, 0409, -mno-sched-epilog)
 189 endif
 190 endif
 191
 192 CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
 193
 194 # Altivec option not allowed with e500mc64 in GCC.
 195 ifdef CONFIG_ALTIVEC
 196 E5500_CPU := -mcpu=powerpc64
 197 else
 198 E5500_CPU := $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
 199 endif
 200 CFLAGS-$(CONFIG_E5500_CPU) += $(E5500_CPU)
 201 CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))
 202
 203 ifdef CONFIG_PPC32
 204 ifdef CONFIG_PPC_E500MC
 205 CFLAGS-y += $(call cc-option,-mcpu=e500mc,-mcpu=powerpc)
 206 else
 207 CFLAGS-$(CONFIG_E500) += $(call cc-option,-mcpu=8540 -msoft-float,-mcpu=powerpc)
 208 endif
 209 endif
 210
 211 asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
 212
 213 KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr)
 214 KBUILD_AFLAGS   += $(AFLAGS-y)
 215 KBUILD_CFLAGS   += $(call cc-option,-msoft-float)
 216 KBUILD_CFLAGS   += -pipe $(CFLAGS-y)
 217 CPP             = $(CC) -E $(KBUILD_CFLAGS)
 218
 219 CHECKFLAGS      += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
 220 ifdef CONFIG_CPU_BIG_ENDIAN
 221 CHECKFLAGS      += -D__BIG_ENDIAN__
 222 else
 223 CHECKFLAGS      += -D__LITTLE_ENDIAN__
 224 endif
 225
 226 ifdef CONFIG_476FPE_ERR46
 227         KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
 228                 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
 229 endif
 230
 231 # No AltiVec or VSX instructions when building kernel
 232 KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
 233 KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
 234
 235 # No SPE instruction when building kernel
 236 # (We use all available options to help semi-broken compilers)
 237 KBUILD_CFLAGS += $(call cc-option,-mno-spe)
 238 KBUILD_CFLAGS += $(call cc-option,-mspe=no)
 239
 240 # Don't emit .eh_frame since we have no use for it
 241 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 242
 243 # Never use string load/store instructions as they are
 244 # often slow when they are implemented at all
 245 KBUILD_CFLAGS           += $(call cc-option,-mno-string)
 246
 247 cpu-as-$(CONFIG_40x)            += -Wa,-m405
 248 cpu-as-$(CONFIG_44x)            += -Wa,-m440
 249 cpu-as-$(CONFIG_ALTIVEC)        += $(call as-option,-Wa$(comma)-maltivec)
 250 cpu-as-$(CONFIG_E500)           += -Wa,-me500
 251
 252 # When using '-many -mpower4' gas will first try and find a matching power4
 253 # mnemonic and failing that it will allow any valid mnemonic that GAS knows
 254 # about. GCC will pass -many to GAS when assembling, clang does not.
 255 cpu-as-$(CONFIG_PPC_BOOK3S_64)  += -Wa,-mpower4 -Wa,-many
 256 cpu-as-$(CONFIG_PPC_E500MC)     += $(call as-option,-Wa$(comma)-me500mc)
 257
 258 KBUILD_AFLAGS += $(cpu-as-y)
 259 KBUILD_CFLAGS += $(cpu-as-y)
 260
 261 KBUILD_AFLAGS += $(aflags-y)
 262 KBUILD_CFLAGS += $(cflags-y)
 263
 264 head-$(CONFIG_PPC64)            := arch/powerpc/kernel/head_64.o
 265 head-$(CONFIG_PPC_BOOK3S_32)    := arch/powerpc/kernel/head_book3s_32.o
 266 head-$(CONFIG_PPC_8xx)          := arch/powerpc/kernel/head_8xx.o
 267 head-$(CONFIG_40x)              := arch/powerpc/kernel/head_40x.o
 268 head-$(CONFIG_44x)              := arch/powerpc/kernel/head_44x.o
 269 head-$(CONFIG_FSL_BOOKE)        := arch/powerpc/kernel/head_fsl_booke.o
 270
 271 head-$(CONFIG_PPC64)            += arch/powerpc/kernel/entry_64.o
 272 head-$(CONFIG_PPC_FPU)          += arch/powerpc/kernel/fpu.o
 273 head-$(CONFIG_ALTIVEC)          += arch/powerpc/kernel/vector.o
 274 head-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE)  += arch/powerpc/kernel/prom_init.o
 275
 276 # See arch/powerpc/Kbuild for content of core part of the kernel
 277 core-y += arch/powerpc/
 278
 279 drivers-$(CONFIG_OPROFILE)      += arch/powerpc/oprofile/
 280
 281 # Default to zImage, override when needed
 282 all: zImage
 283
 284 # With make 3.82 we cannot mix normal and wildcard targets
 285 BOOT_TARGETS1 := zImage zImage.initrd uImage
 286 BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
 287
 288 PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
 289
 290 boot := arch/$(ARCH)/boot
 291
 292 $(BOOT_TARGETS1): vmlinux
 293         $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
 294 $(BOOT_TARGETS2): vmlinux
 295         $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
 296
 297
 298 PHONY += bootwrapper_install
 299 bootwrapper_install:
 300         $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
 301
 302 # Used to create 'merged defconfigs'
 303 # To use it $(call) it with the first argument as the base defconfig
 304 # and the second argument as a space separated list of .config files to merge,
 305 # without the .config suffix.
 306 define merge_into_defconfig
 307         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
 308                 -m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
 309                 $(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
 310         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
 311 endef
 312
 313 PHONY += pseries_le_defconfig
 314 pseries_le_defconfig:
 315         $(call merge_into_defconfig,pseries_defconfig,le)
 316
 317 PHONY += ppc64le_defconfig
 318 ppc64le_defconfig:
 319         $(call merge_into_defconfig,ppc64_defconfig,le)
 320
 321 PHONY += ppc64le_guest_defconfig
 322 ppc64le_guest_defconfig:
 323         $(call merge_into_defconfig,ppc64_defconfig,le guest)
 324
 325 PHONY += ppc64_guest_defconfig
 326 ppc64_guest_defconfig:
 327         $(call merge_into_defconfig,ppc64_defconfig,be guest)
 328
 329 PHONY += powernv_be_defconfig
 330 powernv_be_defconfig:
 331         $(call merge_into_defconfig,powernv_defconfig,be)
 332
 333 PHONY += mpc85xx_defconfig
 334 mpc85xx_defconfig:
 335         $(call merge_into_defconfig,mpc85xx_base.config,\
 336                 85xx-32bit 85xx-hw fsl-emb-nonhw)
 337
 338 PHONY += mpc85xx_smp_defconfig
 339 mpc85xx_smp_defconfig:
 340         $(call merge_into_defconfig,mpc85xx_base.config,\
 341                 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
 342
 343 PHONY += corenet32_smp_defconfig
 344 corenet32_smp_defconfig:
 345         $(call merge_into_defconfig,corenet_base.config,\
 346                 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
 347
 348 PHONY += corenet64_smp_defconfig
 349 corenet64_smp_defconfig:
 350         $(call merge_into_defconfig,corenet_base.config,\
 351                 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
 352
 353 PHONY += mpc86xx_defconfig
 354 mpc86xx_defconfig:
 355         $(call merge_into_defconfig,mpc86xx_base.config,\
 356                 86xx-hw fsl-emb-nonhw)
 357
 358 PHONY += mpc86xx_smp_defconfig
 359 mpc86xx_smp_defconfig:
 360         $(call merge_into_defconfig,mpc86xx_base.config,\
 361                 86xx-smp 86xx-hw fsl-emb-nonhw)
 362
 363 PHONY += ppc32_allmodconfig
 364 ppc32_allmodconfig:
 365         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
 366                 -f $(srctree)/Makefile allmodconfig
 367
 368 PHONY += ppc_defconfig
 369 ppc_defconfig:
 370         $(call merge_into_defconfig,book3s_32.config,)
 371
 372 PHONY += ppc64le_allmodconfig
 373 ppc64le_allmodconfig:
 374         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
 375                 -f $(srctree)/Makefile allmodconfig
 376
 377 PHONY += ppc64le_allnoconfig
 378 ppc64le_allnoconfig:
 379         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
 380                 -f $(srctree)/Makefile allnoconfig
 381
 382 PHONY += ppc64_book3e_allmodconfig
 383 ppc64_book3e_allmodconfig:
 384         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
 385                 -f $(srctree)/Makefile allmodconfig
 386
 387 define archhelp
 388   @echo '* zImage          - Build default images selected by kernel config'
 389   @echo '  zImage.*        - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
 390   @echo '  uImage          - U-Boot native image format'
 391   @echo '  cuImage.<dt>    - Backwards compatible U-Boot image for older'
 392   @echo '                    versions which do not support device trees'
 393   @echo '  dtbImage.<dt>   - zImage with an embedded device tree blob'
 394   @echo '  simpleImage.<dt> - Firmware independent image.'
 395   @echo '  treeImage.<dt>  - Support for older IBM 4xx firmware (not U-Boot)'
 396   @echo '  install         - Install kernel using'
 397   @echo '                    (your) ~/bin/$(INSTALLKERNEL) or'
 398   @echo '                    (distribution) /sbin/$(INSTALLKERNEL) or'
 399   @echo '                    install to $$(INSTALL_PATH) and run lilo'
 400   @echo '  *_defconfig     - Select default config from arch/$(ARCH)/configs'
 401   @echo ''
 402   @echo '  Targets with <dt> embed a device tree blob inside the image'
 403   @echo '  These targets support board with firmware that does not'
 404   @echo '  support passing a device tree directly.  Replace <dt> with the'
 405   @echo '  name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
 406   @echo '  (minus the .dts extension).'
 407 endef
 408
 409 PHONY += install
 410 install:
 411         $(Q)$(MAKE) $(build)=$(boot) install
 412
 413 archclean:
 414         $(Q)$(MAKE) $(clean)=$(boot)
 415
 416 ifeq ($(KBUILD_EXTMOD),)
 417 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 418 # In order to do that, we should use the archprepare target, but we can't since
 419 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 420 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 421 # Therefore we need to generate the header after prepare0 has been made, hence
 422 # this hack.
 423 prepare: vdso_prepare
 424 vdso_prepare: prepare0
 425         $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
 426                 $(build)=arch/powerpc/kernel/vdso32 include/generated/vdso32-offsets.h)
 427         $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
 428                 $(build)=arch/powerpc/kernel/vdso64 include/generated/vdso64-offsets.h)
 429 endif
 430
 431 archprepare: checkbin
 432
 433 archheaders:
 434         $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
 435
 436 ifdef CONFIG_STACKPROTECTOR
 437 prepare: stack_protector_prepare
 438
 439 PHONY += stack_protector_prepare
 440 stack_protector_prepare: prepare0
 441 ifdef CONFIG_PPC64
 442         $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
 443 else
 444         $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
 445 endif
 446 endif
 447
 448 ifdef CONFIG_SMP
 449 prepare: task_cpu_prepare
 450
 451 PHONY += task_cpu_prepare
 452 task_cpu_prepare: prepare0
 453         $(eval KBUILD_CFLAGS += -D_TASK_CPU=$(shell awk '{if ($$2 == "TASK_CPU") print $$3;}' include/generated/asm-offsets.h))
 454 endif
 455
 456 PHONY += checkbin
 457 # Check toolchain versions:
 458 # - gcc-4.6 is the minimum kernel-wide version so nothing required.
 459 checkbin:
 460         @if test "x${CONFIG_CPU_LITTLE_ENDIAN}" = "xy" \
 461             && $(LD) --version | head -1 | grep ' 2\.24$$' >/dev/null ; then \
 462                 echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
 463                 echo 'in some circumstances.' ; \
 464                 echo -n '*** Please use a different binutils version.' ; \
 465                 false ; \
 466         fi