Re: rs6000/sysv4.h SLOW_UNALIGNED_ACCESS and STRICT_ALIGNMENT

[Franz Sirl <Franz dot Sirl-kernel at lauterbach dot com>]

Am Tue, 04 Jan 2000 schrieb David Edelsohn:
>>>>>> Geoff Keating writes:
>
>>> This patch undefines the new AIX-dependent macros added to
>>> rs6000.h.
>
>Geoff> If they were AIX-dependent, why weren't they in an AIX-dependent
>Geoff> header file?  There's already way too much random junk in rs6000.h now.
>
>	Because there is no single, central AIX-specific header file.  The
>"rs6000" port originally only was AIX.  As the port evolved to support
>additional platforms, the AIX-specific definitions were not separated from
>the POWER/PowerPC common definitions.  The AIX-specific headers that do
>exist are deltas for features specific to various AIX releases.
>
>	Starting over, one would structure the port differently, but
>development instead chose to evolve the port with the least disruptive
>change. 

Well, AFAI understand it, this will change in the near future due to the new
configure-based include scheme. So this maybe a good time to start with a
cleanup now. So it would be nice if the AIX-people would start to split out
their stuff into a separate headerfile. After such a change it would probably
be easy to change the other OSes.

For Linux/PPC this would mean that tm.h will have the following entries similar
to this list:

#include <rs6000/rs6000.h>
#include <svr4.h>
#include <rs6000/sysv4.h>
#include <linux.h>
#include <rs6000/linux.h>

Currently this is very hard to do because of all the #define/#include/#undef
trickery done in various headers.

Franz.