linux/arch/x86/Makefile.um
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   1core-y += arch/x86/crypto/
   2
   3ifeq ($(CONFIG_X86_32),y)
   4START := 0x8048000
   5
   6LDFLAGS                 += -m elf_i386
   7ELF_ARCH                := i386
   8ELF_FORMAT              := elf32-i386
   9CHECKFLAGS      += -D__i386__
  10
  11KBUILD_CFLAGS           += $(call cc-option,-m32)
  12KBUILD_AFLAGS           += $(call cc-option,-m32)
  13LINK-y                  += $(call cc-option,-m32)
  14
  15export LDFLAGS
  16
  17LDS_EXTRA               := -Ui386
  18export LDS_EXTRA
  19
  20# First of all, tune CFLAGS for the specific CPU. This actually sets cflags-y.
  21include $(srctree)/arch/x86/Makefile_32.cpu
  22
  23# prevent gcc from keeping the stack 16 byte aligned. Taken from i386.
  24cflags-y += $(call cc-option,-mpreferred-stack-boundary=2)
  25
  26# Prevent sprintf in nfsd from being converted to strcpy and resulting in
  27# an unresolved reference.
  28cflags-y += -ffreestanding
  29
  30# Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
  31# a lot more stack due to the lack of sharing of stacklots.  Also, gcc
  32# 4.3.0 needs -funit-at-a-time for extern inline functions.
  33KBUILD_CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then \
  34                        echo $(call cc-option,-fno-unit-at-a-time); \
  35                        else echo $(call cc-option,-funit-at-a-time); fi ;)
  36
  37KBUILD_CFLAGS += $(cflags-y)
  38
  39else
  40
  41START := 0x60000000
  42
  43KBUILD_CFLAGS += -fno-builtin -m64 
  44
  45CHECKFLAGS  += -m64 -D__x86_64__
  46KBUILD_AFLAGS += -m64
  47LDFLAGS += -m elf_x86_64
  48KBUILD_CPPFLAGS += -m64
  49
  50ELF_ARCH := i386:x86-64
  51ELF_FORMAT := elf64-x86-64
  52
  53# Not on all 64-bit distros /lib is a symlink to /lib64. PLD is an example.
  54
  55LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib64
  56LINK-y += -m64
  57
  58# Do unit-at-a-time unconditionally on x86_64, following the host
  59KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
  60endif
  61
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