test/SemaCXX/warn-new-overaligned-3.cpp

// RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned %s -isystem %S/Inputs -verify=precxx17 %std_cxx11-14
// RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned %s -isystem %S/Inputs -verify %std_cxx17-

// expected-no-diagnostics

// This test ensures that we still get the warning even if we #include <new>
// where the header here simulates <new>.
#include <warn-new-overaligned-3.h>

namespace test1 {
struct Test {
  template <typename T>
  struct SeparateCacheLines {
    T data;
  } __attribute__((aligned(256)));

  SeparateCacheLines<int> high_contention_data[10];
};

void helper() {
  Test t;
  new Test;  // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
  new Test[10];  // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
}
}

namespace test2 {
struct helper { int i __attribute__((aligned(256))); };

struct Placement {
  Placement() {
    new (d) helper();
  }
  helper *d;
};
}