Geert Uytterhoeven wrote:
On Tue, 9 Dec 2008, Sam Ravnborg wrote:
On Tue, Dec 09, 2008 at 12:26:05AM +0100, Arnd Bergmann wrote:
On Tuesday 09 December 2008, Geert Uytterhoeven wrote:
I have used the following include guard:
#ifdef __uClinux__
#include "atomic_no.h"
#else
#include "atomic_mm.h"
#endif
gcc -E -dM for the two compilers revealed that this was the
only symbol that differed.
I think you can share a toolchain for m68k and m68knommu, at least for the
kernel (I used my plain m68k toolchain when experimenting with m68knommu for
Amiga).
With the above construct we do the "right thing" also for
headers exported to userspace.
But actually none of the headers using the above are
subject for export at the moment so we could use a
CONFIG_ symbol for the same.
So I prefer to just check CONFIG_MMU.
Some of them are, by means of include/asm-generic/Kbuild.asm, e.g.
unistd.h!
I was fooled by make headers_check showing no errros.
But it turns out that headers_check does not recognize
includes made with "".
So I will update the patch to include revevant *_{no,mm}.h files
in Kbuild.
I'm not sure if it's entirely correct, but I think you can use
#ifdef __KERNEL__
# ifdef CONFIG_MMU
# include "atomic_mm.h
# else
# include "atomic_no.h
# endif
#else
# ifndef __uClinux__
# include "atomic_mm.h
# else
# include "atomic_no.h
# endif
#endif
Can someone with a shared (m68k/m68knommu) please check if
__uClinux__ is only set in the m68knommu case.
Use:
touch foo.h; gcc -E -dM
to see what is defined by the compiler.
You will also need to specify if this is for m68k or m68knommu.
Any comments from the m68knommu toolchain people?
>
None of my m68k-linux compilers set __uClinux__, as expected.
A m68k-uclinux- gcc will. From a gcc-4.2.4
m68k-uclinux-gcc -E -dM /tmp/foo.h | grep -i linux
#define __linux 1
#define __linux__ 1
#define __uClinux__ 1
#define __gnu_linux__ 1
#define linux 1
(I think that is one of the very few differences of m68k-linux
over m68k-uclinux...)
I would rather just have a m68k-linux myself, and not have a
separate m68k-uclinux toolchain.
Regards
Greg
------------------------------------------------------------------------
Greg Ungerer -- Principal Engineer EMAIL: g...@snapgear.com
SnapGear, a McAfee Company PHONE: +61 7 3435 2888
825 Stanley St, FAX: +61 7 3891 3630
Woolloongabba, QLD, 4102, Australia WEB: http://www.SnapGear.com
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