[PATCH][RFA/RFC] Stack clash mitigation patch 01/08 V2

[Jeff Law]

On 07/20/2017 07:23 AM, Segher Boessenkool wrote:
> Hi Jeff,
> 
> On Tue, Jul 18, 2017 at 11:17:19PM -0600, Jeff Law wrote:
>>
>> The biggest change in this update to patch 01/08 is moving of stack
>> clash protection out of -fstack-check= and into its own option,
>> -fstack-clash-protection.  I believe other issues raised by reviewers
>> have been addressed as well.
> 
> I think the documentation for the new option should say this only
> provides partial protection on targets that do not have fuller protection
> enabled.  Is there some way for users to find out which targets those
> are / if their target is one of those?
Agreed.  I've added a note in the documentation.

Sadly, there's no way short of listing them and keeping that list
up-to-date over time by hand.  If we want to do that, I would suggest
we note the processors with full support as well as those with partial
support using the -fstack-check=specific prologues.

I think we ought to provide that target specific information in the
documentation, though I worry it will get out of date.  Thoughts?

jeff