Hi David,
what version of clang did you use btw ?
--
Dipl.-Ing.
Jan-Simon Möller
jansimon.moel...@gmx.de
Am Mittwoch, 8. Januar 2014, 11:21:22 schrieb David Woodhouse:
> I have this working with LLVM/Clang, and a PR is filed for GCC because
> the current hacks we have to do to *try* to ensure that .code16gcc is
> the first thing in the asm output are horrid.
>
> Signed-off-by: David Woodhouse <david.woodho...@intel.com>
> ---
> arch/x86/Makefile | 15 +++++++++++----
> 1 file changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/Makefile b/arch/x86/Makefile
> index ef19271..60fc67d 100644
> --- a/arch/x86/Makefile
> +++ b/arch/x86/Makefile
> @@ -13,14 +13,21 @@ 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.
> -REALMODE_CFLAGS := -m32 -g -Os -D__KERNEL__ -DDISABLE_BRANCH_PROFILING \
> +#
> +# We really want GCC to have a -m16 option like clang, so that we don't
> +# have to play these evil and unreliable tricks to ensure that our
> +# asm(".code16gcc") is first in the asm output. http://gcc.gnu.org/PR59672
> +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 := -m16
> +
> +REALMODE_CFLAGS := -g -Os -D__KERNEL__ -DDISABLE_BRANCH_PROFILING \
> + $(call cc-option, $(M16_CFLAGS), $(CODE16GCC_CFLAGS)) \
> -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
> - -include $(srctree)/arch/x86/boot/code16gcc.h \
> -fno-strict-aliasing -fomit-frame-pointer -fno-pic \
> -mno-mmx -mno-sse \
> $(call cc-option, -ffreestanding) \
> - $(call cc-option, -fno-toplevel-reorder,\
> - $(call cc-option, -fno-unit-at-a-time)) \
> $(call cc-option, -fno-stack-protector) \
> $(call cc-option, -mpreferred-stack-boundary=2)
> export REALMODE_CFLAGS
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
