On Tue, Jul 10, 2007 at 01:42:48PM -0700, H. Peter Anvin wrote:
> Segher Boessenkool wrote:
> >
> > Well at least with -fno-toplevel-reorder it is guaranteed
> > to work (not the same thing as "is working", heh, but fairly
> > close).
> >
> > It seems to me GCC should grow an option to insert .code16gcc
> > by itself (-m16 perhaps?) Or GAS could get a flag to include
> > a file as a prelude before the main thing. Neither will help
> > Linux right now of course.
>
> -m16 is the right thing, and it also provides a proper hook for
> eventually having a real 16-bit backend (there are at least two
> projects for doing that.)
>
> For now, I have:
Can't you use the global CFLAGS and append your specific ones?
> CFLAGS := $(LINUXINCLUDE) -g -Os -D_SETUP -D__KERNEL__ \
-g ???
> $(cflags-$(ARCH)) \
> -Wall -Wstrict-prototypes \
> -march=i386 -mregparm=3 \
Why -march=i386 ?
> -include $(srctree)/$(src)/code16gcc.h \
> -fno-strict-aliasing -fomit-frame-pointer \
> $(call cc-option, -ffreestanding) \
No need to test, -ffreestanding is supported by all gcc versions we
support.
> $(call cc-option, -fno-unit-at-a-time) \
> $(call cc-option, -fno-toplevel-reorder) \
> $(call cc-option, -fno-stack-protector) \
> $(call cc-option, -mpreferred-stack-boundary=2)
>
> ... since that will require less violence to eventually hack in the
> proper -m16 option if/when it becomes available.
>
> -hpa
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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