[cfe-commits] [patch][pr14766] Reject invalid redeclarations of extern C functions and variables

[Rafael Espíndola]

When processing the second g in

extern "C" {
  void f() {
    extern void g(int);
  }
}
int g(int);

we first check if it is extern C and then look for non visible
extern-C declarations. So in this example we don't do the lookup at
all. The attached patch fixes this by doing the lookup and checking if
the found decl is extern C.

Cheers,
Rafael
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