[PATCH 1/4] Add framework for tunables

[Joseph Myers]

On Tue, 27 Dec 2016, Florian Weimer wrote:

> > +    default:
> > +      __builtin_unreachable ();
> 
> Should this rather be __bultin_trap?

Note that __bultin_trap generates a call to abort on some platforms.  It 
can only be used in places where such a call is OK; we've had problems 
with the isolate-erroneous-paths optimization generating such calls.  So 
make sure anything using __bultin_trap builds OK for SH with 
build-many-glibcs.py, for example.

-- 
Joseph S. Myers
joseph@codesourcery.com