[PATCH] D21607: [ELF] - Proccess 'extern' keyword in version scripts.

[George Rimar via llvm-commits]

>> So looks like at this moment we do not plan to support externs ?
>> May be worst to show explicit message about that then ?
>
>
>A "not supported" error is probably the best for now.
>Cheers,
>Rafael

Ok, I`ll prepare a patch.

What about @ and @@ ?

__asm__(".symver b_1,b at LIBSAMPLE_1.0");
int b_1() {
  return 1;
}

__asm__(".symver b_2,b@@LIBSAMPLE_2.0");
int b_2() {
  return 2;
}

I can start working on it.