According to the GCC manual on -fno-omit-frame-pointer:

> Note that -fno-omit-frame-pointer doesn't guarantee the frame pointer
> is used in all functions.  Several targets always omit the frame
> pointer in leaf functions.

And what is says about -m[no-]omit-leaf-frame-pointer:

> -momit-leaf-frame-pointer
> -mno-omit-leaf-frame-pointer
>
> Omit or keep the frame pointer in leaf functions.  The former behavior
> is the default.

So we should probably prevent both.