llvm-project/clang/test/CodeGenCXX/flatten.cpp

// UNSUPPORTED: experimental-new-pass-manager
// See the comment for CodeGen/flatten.c on why this is unsupported with the new
// PM.

// RUN: %clang_cc1 -triple=x86_64-linux-gnu -std=c++11 %s -emit-llvm -o - | FileCheck %s

void f(void) {}

[[gnu::flatten]]
// CHECK: define void @_Z1gv()
void g(void) {
  // CHECK-NOT: call {{.*}} @_Z1fv
  f();
}