On Wed, Mar 25, 2020 at 12:54:10PM +0100, Ard Biesheuvel wrote: > On Wed, 25 Mar 2020 at 12:50, Mark Brown <broonie@xxxxxxxxxx> wrote: > > Since BTI is a mandatory feature of v8.5 there is no BTI arch_extension, > > you can only enable it by moving the base architecture to v8.5. You'd > > need to use .arch and that feels likely to find us sharp edges to run > > into. > I think we should talk to the toolchain folks about this. Even if > .arch_extension today does not support the 'bti' argument, it *is* > most definitely an architecture extension, even it it is mandatory in > v8.5 (given that v8.5 is itself an architecture extension). I agree entirely, the current behaviour is surprising and doesn't really map onto how the architecture is described - my first thought was similar to yours. It won't help us right now but it would help for future architecture extensions and for other projects.
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