Re: [RFD] How to fix FRAME_CHAIN_VALID redefinition in config/i386/tm-i386v4.h ?

[Andrew Cagney <ac131313@cygnus.com>]

> 
> Or we could fix this particular problem by making FRAME_CHAIN_VALID
> into a multi-arch method (just in case, and for hppa (?) which seemed
> to have a useful redefinition, though I don't see why it was needed),
> defaulting it to func_frame_chain_valid for all targets.  No one ever
> gave me a reason not to do this when I asked.

Er, FRAME_CHAIN_VALID is a multi-arch method.

>> I suspect a combination of the first three is the best.  The moment the 
>> heuristic is pushed down to the target we end up with inconsistent, 
>> target dependant, behavour.
> 
> 
> There's some interesting code along these lines in what Richard
> committed for ARM.  He parses things like glibc's .note.ABI-tag
> section, as well as ELF_OSABI fields where set.

The situtation is very similar to COERCE_FLOAT_TO_DOUBLE.  The problem 
should be solved in a generic way.  However, until then each target gets 
to come up with a local solution.

Andrew