On Thu, Jan 11, 2018 at 06:01:23PM +0100, Jiri Kosina wrote: > On Thu, 11 Jan 2018, Josh Poimboeuf wrote: > > > I think I heard that retpolines won't be ported to anything older than > > GCC 4.9, so maybe it's safe to use '%='. I don't remember when it was > > introduced into GCC though. > > I'm afraid we'll have to backport retpolines in some form to 4.3.x at > least. I'd be surprised if we'd be the only ones on this planet :)
So upstream code is going to require 4.5 at least, and 4.4 has %=. Backport effort will just have to cope or backport more GCC bits, that is, if you're backporting retpoline to 4.3 also backport asm-goto.
