Re: multiarch x86_64 target

[Andrew Cagney <ac131313@cygnus.com>]

>  Hello,
> 
>   I am converting x86_64 target to multiarch as you wanted. The bfd
> architecture for both i386 and x86_64 is bfd_arch_i386. And these
> targets are diferentiated by machine type.
>   Due to the i386 target is not yet multiarched I have a problem how to register
> x86_64 in gdb.
>   I have created function i386_gdbarch_init which behaves that if target
> vector for machine type differs from bfd_mach_x86_64 should be created
> then internal_error(Not yet implemented) is invoked.
>   But when the gdb starts up then there is created target vector for default
> machine type - bfd_mach_i386_i386. Thus gdb can't run.

In x86-64-tdep.c?

>   Do you have any ideas how to solve it?

Ulgh!  For the short term, I'd just ignore it - return the x86-64 vector 
regardless.  The one thing I wouldn't be trying to do is trying to 
multi-arch the x86.

I should also note a known bug related to this (it won't affect your 
code).  The architecture selection mechanism currently doesn't handle 
multiple registrants for the same architecture (eg raw x86 vs 
x86-linux).  x86 vs x86_64 is going to be another example of this.  Once 
the x86 is multi-arched a solution will be needed.

	Andrew