test/Modules/polluted-operator.cppm

// RUN: rm -rf %t
// RUN: mkdir -p %t
// RUN: split-file %s %t
//
// RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/a.cppm -o %t/a.pcm
// RUN: %clang_cc1 -std=c++20 %t/b.cppm -fprebuilt-module-path=%t -emit-module-interface -o %t/b.pcm -verify
//
// Testing the behavior of `-fskip-odr-check-in-gmf`
// RUN: %clang_cc1 -std=c++20 -fskip-odr-check-in-gmf  -emit-module-interface %t/a.cppm -o \
// RUN:   %t/a.pcm
// RUN: %clang_cc1 -std=c++20 -fskip-odr-check-in-gmf  %t/b.cppm -fprebuilt-module-path=%t \
// RUN:   -emit-module-interface -DSKIP_ODR_CHECK_IN_GMF -o %t/b.pcm -verify

// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface %t/a.cppm -o %t/a.pcm
// RUN: %clang_cc1 -std=c++20 %t/b.cppm -fprebuilt-module-path=%t -emit-reduced-module-interface \
// RUN:     -o %t/b.pcm -verify -DREDUCED

//--- foo.h

namespace std
{
    template<class _Dom1>
    void operator &&(_Dom1 __v, _Dom1 __w)
    { 
        return;
    }
}

//--- bar.h
namespace std 
{
  template<typename... _Types>
    struct _Traits
    {
      static constexpr bool _S_copy_ctor =
   (__is_trivial(_Types) && ...);
    };

  template<typename... _Types>
    struct variant
    {
      void
      swap(variant& __rhs)
      noexcept((__is_trivial(_Types) && ...))
      {
      }
    };
}

//--- a.cppm
module;
// The operator&& defined in 'foo.h' will pollute the 
// expression '__is_trivial(_Types) && ...' in bar.h
#include "foo.h"
#include "bar.h"
export module a;
export namespace std {
  using std::variant;
  using std::_Traits;
  using std::operator&&;
}

//--- b.cppm
module;
#include "bar.h"
export module b;
import a;
export namespace std {
  using std::variant;
  using std::_Traits;
  using std::operator&&;
}

#ifdef SKIP_ODR_CHECK_IN_GMF
// expected-no-diagnostics
#else
// expected-error@* {{has different definitions in different modules; first difference is defined here found data member '_S_copy_ctor' with an initializer}}
// expected-note@* {{but in 'a.<global>' found data member '_S_copy_ctor' with a different initializer}}
#endif