[PATCH] D13093: [ELF2] - output of all unknown arguments instead of only one

[Rafael Espíndola via llvm-commits]

> -  for (auto *Arg : Args.filtered(OPT_UNKNOWN))
> -    error(Twine("unknown argument: ") + Arg->getSpelling());
> +
> +  auto unknowns = Args.filtered(OPT_UNKNOWN);
> +  for (llvm::opt::arg_iterator Arg = unknowns.begin(), End = unknowns.end(); Arg != End; ++Arg)
> +    warning(Twine("warning: unknown argument: ") + (*Arg)->getSpelling());
> +  if (unknowns.begin() != unknowns.end())
> +    error(Twine("unknown argument(s) found"));
> +

You should still be able to use a range loop:

auto Unknowns = Args.filtered(OPT_UNKNOWN);
for (auto *Arg : Unknows)
  ....
if (Unkonws.begin() != Unknows.end())
...