[llvm-dev] retpoline mitigation and 6.0

[David Woodhouse via llvm-dev]

On Sat, 2018-02-03 at 01:08 +0000, Chandler Carruth wrote:
> 
> Sure, I can see why for the kernel, this is important. It also gets
> to essentially define its ABI however it wants.
> 
> For our other users, they specifically don't want this in the ABI
> (because they actually have DSOs and other junk being linked
> together). And yes, we actually have a decent number of users of this
> in userspace and outside the kernel. =/

Using the *external* thunk in order to provide their own? While
claiming it isn't an ABI? That seems... odd.

Nobody cares what you call it when you're doing it inline or in a
COMDAT section. It's *only* the external thunk where it absolutely
*does* become an ABI, where we care about consistency.
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