[libcxx] [test] Remove workaround for C1XX conversion-to-nullptr bug

[CaseyCarter]

Summary

VSO#391542 "Types can't be convertible to nullptr_t," which will be fixed in the next release of Visual C++.

Also put internal bug numbers on the workarounds in test_workarounds.h for ease of correlation.

[STL_MSFT]

test/support/test_workarounds.h

21 ↗

(On Diff #99326)

Do you need to go update the tests that were using this?

[CaseyCarter]

Commit the change to the affected test code as well.

[CaseyCarter]

test/support/test_workarounds.h

21 ↗

(On Diff #99326)

Yes, thanks, poisoned_hash_helper.hpp didn't make it into the commit.

[EricWF]

LGTM.

[EricWF]

@CaseyCarter Changes like this are good for post-commit review (ie just commit it)

libcxx/trunk/test/support/poisoned_hash_helper.hpp

namespace PoisonedHashDetail {
   enum EnumClass : bool {};
   struct Class {};
 }
 
 // Each header that declares the template hash provides enabled
 // specializations of hash for nullptr t and all cv-unqualified
 // arithmetic, enumeration, and pointer types.
 using LibraryHashTypes = TypeList<
-#if !defined(TEST_WORKAROUND_C1XX_BROKEN_NULLPTR_CONVERSION_OPERATOR)
 #if TEST_STD_VER > 14
       decltype(nullptr),
 #endif
-#endif
       bool,
       char,
       signed char,
       unsigned char,
       wchar_t,
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
       char16_t,
       char32_t,

libcxx/trunk/test/support/test.workarounds/c1xx_broken_nullptr_conversion_operator.pass.cpp

-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++98, c++03
-
-// Verify TEST_WORKAROUND_C1XX_BROKEN_NULLPTR_CONVERSION_OPERATOR.
-
-#include <type_traits>
-
-#include "test_workarounds.h"
-
-struct ConvertsToNullptr {
-  using DestType = decltype(nullptr);
-  operator DestType() const { return nullptr; }
-};
-
-int main() {
-#if defined(TEST_WORKAROUND_C1XX_BROKEN_NULLPTR_CONVERSION_OPERATOR)
-  static_assert(!std::is_convertible<ConvertsToNullptr, decltype(nullptr)>::value, "");
-#else
-  static_assert(std::is_convertible<ConvertsToNullptr, decltype(nullptr)>::value, "");
-#endif
-}

libcxx/trunk/test/support/test_workarounds.h

 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is dual licensed under the MIT and the University of Illinois Open
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUPPORT_TEST_WORKAROUNDS_H
 #define SUPPORT_TEST_WORKAROUNDS_H
 
 #include "test_macros.h"
 
 #if defined(TEST_COMPILER_EDG)
-# define TEST_WORKAROUND_EDG_EXPLICIT_CONSTEXPR
+# define TEST_WORKAROUND_EDG_EXPLICIT_CONSTEXPR // VSO#424280
 #endif
 
 #if defined(TEST_COMPILER_C1XX)
-# define TEST_WORKAROUND_C1XX_BROKEN_NULLPTR_CONVERSION_OPERATOR
-# define TEST_WORKAROUND_C1XX_BROKEN_IS_TRIVIALLY_COPYABLE
-# define TEST_WORKAROUND_C1XX_EMPTY_PARAMETER_PACK_EXPANSION
+# define TEST_WORKAROUND_C1XX_BROKEN_IS_TRIVIALLY_COPYABLE // VSO#117743
+# define TEST_WORKAROUND_C1XX_EMPTY_PARAMETER_PACK_EXPANSION // VSO#109062
 # ifndef _MSC_EXTENSIONS
-#  define TEST_WORKAROUND_C1XX_BROKEN_ZA_CTOR_CHECK
+#  define TEST_WORKAROUND_C1XX_BROKEN_ZA_CTOR_CHECK // VSO#119998
 # endif
 #endif
 
 #endif // SUPPORT_TEST_WORKAROUNDS_H