[cfe-dev] Weird clang behaviour wrt identifiers with the same name of builtin functions

[Abramo Bagnara]

This little program fails to compile with clang r74831

$ cat w.c
void f1() {
  int index = 1;
}

static int index;

int f() {
  return index << 2;
}
$ ~/llvm/Debug/bin/clang-cc z.c
z.c:51:12: error: redefinition of 'index' as different kind of symbol
static int index;
           ^
z.c:48:7: note: previous definition is here
  int index = 1;
      ^
z.c:54:16: error: invalid operands to binary expression ('char *(char
const *,
      int)' and 'int')
  return index << 2;
         ~~~~~ ^  ~
3 diagnostics generated.


This seems to happen only with builtin function name and only if there
is a locally scoped variabile with the same name.

It looks very strange to me, I hope someone is able to shed some light
on this failure.