[PATCH] powerpc64-linux bi-arch support

[Jakub Jelinek]

On Thu, May 29, 2003 at 06:05:51PM -0400, David Edelsohn wrote:
> >>>>> Alan Modra writes:
> 
> Alan> In exactly the same situations a non-biarch --target=powerpc-linux
> Alan> compiler will use RS6000_CALL_GLUE.  ie. the patch doesn't change
> Alan> existing behaviour.  You may have unearthed an existing bug, but
> Alan> it's not a new one.
> 
> 	I don't think it necessarily is a bug because the macros is not
> except for ABI_AIX.
> 
> 	I want to avoid adding new definitions or expanding definitions to
> cover cases that don't exist because someone later will interpret that as
> self-documenting code: "This was done on purpose."  Or later will enable
> some 32/64-bit thunk mode that breaks because of this.  Where possible, I
> would like to avoid making things selectable when the other case never
> occurs.
> 
> 	Please keep RS6000_CALL_GLUE uniformly defined to "nop".  If this
> breaks something, we have a worse problem.

But then either linux.h would need to define RS6000_CALL_GLUE the same way,
or -mcall-aixdesc should be disallowed for powerpc-*-linux* and
powerpc64-*-linux* targets.
If linux.h inherits the cror definition from sysv.h and linux64.h defines
it to nop unconditionally, then suddenly --target powerpc-ibm-linux and
--target powerpc64-ibm-linux --with-cpu=default32 behave differently,
which is IMHO not desirable. The only difference between those two should
be that the latter supports -m64 while the former does not.

	Jakub