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Delete main? This cannot be undone.

cxx11-noreturn.cpp
// RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple -std=c++11 %s -o - | FileCheck %s

int g();

// CHECK: _Z1fv(){{.*}} [[NR:#[0-9]+]]
[[noreturn]] int f() {
  while (g()) {}
}

// CHECK: attributes [[NR]] = { mustprogress noinline noreturn nounwind{{.*}} }