llvm-gcc-4.0/gcc/testsuite/gcc.dg/dremf-type-compat-4.c

/* Test for bogus diagnostics for dremf definition, as in bug 16666.
   The GNU extension permitting a prototype to override the promotion
   of old-style parameter declarations should only apply when the
   prototype is visible, not for a built-in prototype.  */
/* { dg-do compile } */
/* { dg-options "" } */

float
dremf(x, y)
     float x, y; /* { dg-warning "warning: conflicting types for built-in function 'dremf'" } */
{
  return x + y;
}