Merge tag 'trace-fixes-v3.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git...

[karo-tx-linux.git] / arch / x86 / Makefile

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 13b22e0f681dbeff951dde5055e7f594778a98a1..eeda43abed6ec8d48837abaa5f6c18a40c38785a 100644 (file)
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -11,6 +11,28 @@ else
         KBUILD_DEFCONFIG := $(ARCH)_defconfig
 endif
 
+# How to compile the 16-bit code.  Note we always compile for -march=i386;
+# that way we can complain to the user if the CPU is insufficient.
+#
+# The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For
+# older versions of GCC, we need to play evil and unreliable tricks to
+# attempt to ensure that our asm(".code16gcc") is first in the asm
+# output.
+CODE16GCC_CFLAGS := -m32 -include $(srctree)/arch/x86/boot/code16gcc.h \
+                   $(call cc-option, -fno-toplevel-reorder,\
+                     $(call cc-option, -fno-unit-at-a-time))
+M16_CFLAGS      := $(call cc-option, -m16, $(CODE16GCC_CFLAGS))
+
+REALMODE_CFLAGS        := $(M16_CFLAGS) -g -Os -D__KERNEL__ \
+                  -DDISABLE_BRANCH_PROFILING \
+                  -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
+                  -fno-strict-aliasing -fomit-frame-pointer -fno-pic \
+                  -mno-mmx -mno-sse \
+                  $(call cc-option, -ffreestanding) \
+                  $(call cc-option, -fno-stack-protector) \
+                  $(call cc-option, -mpreferred-stack-boundary=2)
+export REALMODE_CFLAGS
+
 # BITS is used as extension for files which are available in a 32 bit
 # and a 64 bit version to simplify shared Makefiles.
 # e.g.: obj-y += foo_$(BITS).o