libcxx: Use vcruntime declarations for typeinfo on Windows.

We need to use the vcruntime declarations on Windows to avoid an
ODR violation involving rtti.obj, which provides the definition of
the runtime function implementing dynamic_cast and depends on the
vcruntime implementations of bad_cast and bad_typeid.

Differential Revision: https://reviews.llvm.org/D42220

llvm-svn: 323491

libcxx/include/typeinfo

@@ -69,6 +69,10 @@ public:
 #pragma GCC system_header
 #endif
 
+#if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
+#include <vcruntime_typeinfo.h>
+#else
+
 #if !defined(_LIBCPP_ABI_MICROSOFT)
 #if defined(_LIBCPP_NONUNIQUE_RTTI_BIT)
 #define _LIBCPP_HAS_NONUNIQUE_TYPEINFO
@@ -219,6 +223,8 @@ public:
 
 }  // std
 
+#endif // defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
+
 _LIBCPP_BEGIN_NAMESPACE_STD
 _LIBCPP_NORETURN inline _LIBCPP_ALWAYS_INLINE
 void __throw_bad_cast()

libcxx/src/support/runtime/exception_msvc.ipp

@@ -97,6 +97,7 @@ bad_array_length::what() const _NOEXCEPT
     return "bad_array_length";
 }
 
+#if defined(_LIBCPP_NO_VCRUNTIME)
 bad_cast::bad_cast() _NOEXCEPT
 {
 }
@@ -125,7 +126,6 @@ bad_typeid::what() const _NOEXCEPT
   return "std::bad_typeid";
 }
 
-#if defined(_LIBCPP_NO_VCRUNTIME)
 exception::~exception() _NOEXCEPT
 {
 }

libcxx/src/typeinfo.cpp

@@ -9,7 +9,7 @@
 
 #include "typeinfo"
 
-#if defined(_LIBCPP_ABI_MICROSOFT)
+#if defined(_LIBCPP_ABI_MICROSOFT) && defined(_LIBCPP_NO_VCRUNTIME)
 #include <string.h>
 
 int std::type_info::__compare(const type_info &__rhs) const _NOEXCEPT {
@@ -49,7 +49,8 @@ size_t std::type_info::hash_code() const _NOEXCEPT {
 // FIXME: Remove __APPLE__ default here once buildit is gone.
 // FIXME: Remove the _LIBCPP_BUILDING_HAS_NO_ABI_LIBRARY configuration.
 #if (!defined(LIBCXX_BUILDING_LIBCXXABI) && !defined(LIBCXXRT) &&              \
-     !defined(__GLIBCXX__) && !defined(__APPLE__)) ||                          \
+     !defined(__GLIBCXX__) && !defined(__APPLE__) &&                           \
+     !(defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME))) ||   \
     defined(_LIBCPP_BUILDING_HAS_NO_ABI_LIBRARY)
 std::type_info::~type_info()
 {