[llvm-dev] zero-size arrays

[Tim Northover via llvm-dev]

Hi,

On Wed, 17 Oct 2018 at 10:07, m m via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> My understanding is that those arrays are auto-generated from the .td files but I do not know why they are empty.

I think you populate them by instantiating SubtargetFeature in your
.td files. Most real targets have at least some variation in permitted
configurations that these represent: variation in the instruction set
the CPU supports or which instructions are fast on a particular CPU,
or even soft vs hard-float.

If yours doesn't have such variation yet you might need to add a dummy
feature for now. It'll probably also need to be put into ABCSubtarget,
but the new and interesting error messages should guide you on that
front.

Cheers.

Tim.