Re: [PATCH 02/23] x86, realmode: realmode.bin infrastructure
From: H. Peter Anvin
Date: Tue May 08 2012 - 15:15:05 EST
On 05/08/2012 11:53 AM, Sam Ravnborg wrote:
+# 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.
+KBUILD_CFLAGS := $(LINUXINCLUDE) -m32 -g -Os -D_SETUP -D__KERNEL__ \
+ -DDISABLE_BRANCH_PROFILING \
+ -Wall -Wstrict-prototypes \
+ -march=i386 -mregparm=3 \
+ -include $(srctree)/$(src)/../../boot/code16gcc.h \
+ -fno-strict-aliasing -fomit-frame-pointer \
+ $(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)
+KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__
> How much is needed to avoid this misuse of kernel-internal build rules?
> This was and is an ugly hack.
It is more or less the same as for arch/x86/boot and other things. If
there are better ways to do it suggestions are very much appreciated.
However, it is a bit of a tricky bit because we need *some* of the bits
of the target compiler configuration and some not (this is the same as
arch/x86/boot etc.) It is not "pure target" but it's also most
definitely not host.
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