llvm/test/FrontendC/2007-09-17-WeakRef.c

// RUN: %llvmgcc -O1 -S %s -o - | grep icmp
// PR1678
// XFAIL: llvmgcc4.0.1
extern void B (void);
static __typeof(B) A __attribute__ ((__weakref__("B")));
int active (void)
{
  static void *const p = __extension__ (void *) &A;
  return p != 0;
}