Andi Kleen wrote:

On Tuesday 10 July 2007 16:16:29 Segher Boessenkool wrote:

quoted

quoted

gcc for i386 can be used with the assembly prefix ".code16gcc" to  
generate
16-bit (real-mode) code.  This header file provides the assembly  
prefix.

This only works correctly with newer GCCs if you pass the
-fno-toplevel-reorder option (and it only works on older
GCC versions by accident).

And on older ones (gcc-3.3-hammer / 3.4 / 4.0 ) -fno-unit-at-a-time

Still it seems quite fragile to me agreed.

The alternative, of course, is to compile to an .s file and insert
.code16gcc into the .s file.  This makes the Makefile uglier, but would
be more resilient against oddball gcc changes.

I'm a bit surprised about the claim w.r.t. -fno-unit-at-a-time (although
I guess that is the default and one would thus typically not see this.)
 Got any pointers why that would cause a global asm() to be scrambled
around?

	-hpa