GCC target_clone support

[Jeff Law]

On 05/05/2017 12:18 PM, Michael Meissner wrote:
> I'm in the middle of adding support for the target_clone attribute to the
> PowerPC.  At the moment, the x86_64/i386 port is the only port that supports
> target_clone.  I added the arm/s390 port maintainers to this query, because
> those ports might also consider supporting target_clones in the future.
> 
> In doing the work, I noticed that some of the functions called by the target
> hooks that were fairly generic, and we might want to move these functions into
> common code?  Would people object if I put out a patch to move these functions
> to common code?
Sounds wise to me -- as you know its not unusual to find commonality 
when a feature is enabled on a new target.


> 
> I also have a question on the functionality of target_clone that I will address
> in a separate message.
> 
> So far, the list of generic code that could be moved to common code to allow
> other ports to add target_clone support include:Please consider this class of changes pre-approved.  There's no reason 
to wait for review as you move this stuff around and generalize it slightly.

jeff