[clang] [llvm] [ARM] Emit an error when the hard-float ABI is enabled but can't be used. (PR #111334)

[Ralf Jung via cfe-commits]

RalfJung wrote:

> Generally clang-level warnings/errors are more user friendly then the llvm-level errors (but both may be useful for other frontends).

What would be really nice is if the LLVM backend could tell the frontend about the error rather than reporting it itself, that way frontends can use their nice error reporting code but don't have to re-implement the error detection logic. :)

Anyway, that's a different issue...

https://github.com/llvm/llvm-project/pull/111334