hanchenye-llvm-project/llvm/test/FrontendC/2004-07-06-FunctionCast.c

// RUN: %llvmgcc -S %s -o - | llvm-as -o /dev/null

static int unused_func(void) {
  return 1;
}

int foo(void) {
  (void)unused_func; /* avoid compiler warning */
  return 2;
}