Fix GCC < 11 and NVRTC build failures

- resource_cast: explicitly static_cast to __basic_any base before
  calling __any_cast, working around GCC < 11 inability to deduce
  template arguments from derived-to-base class conversions.
- basic_any test: change test_iset_dynamic_cast from _CCCL_HOST to
  _CCCL_HOST_DEVICE so NVRTC can compile the file.

Author: pciolkosz

libcudacxx/include/cuda/__memory_resource/any_resource.h

@@ -993,7 +993,8 @@ template <class _Tp, class... _Properties>
 {
   static_assert(::cuda::std::is_void_v<_Tp> || ::cuda::mr::resource_with<_Tp, _Properties...>,
                 "_Tp must be void or satisfy resource_with<_Tp, _Properties...>");
-  return ::cuda::__any_cast<_Tp>(__res);
+  // Use static_cast to the __basic_any base to work around GCC < 11 template argument deduction issues.
+  return ::cuda::__any_cast<_Tp>(static_cast<::cuda::__basic_any<__iasync_resource<_Properties...>>*>(__res));
 }
 
 //! @overload
@@ -1002,7 +1003,7 @@ template <class _Tp, class... _Properties>
 {
   static_assert(::cuda::std::is_void_v<_Tp> || ::cuda::mr::resource_with<_Tp, _Properties...>,
                 "_Tp must be void or satisfy resource_with<_Tp, _Properties...>");
-  return ::cuda::__any_cast<_Tp>(__res);
+  return ::cuda::__any_cast<_Tp>(static_cast<const ::cuda::__basic_any<__iasync_resource<_Properties...>>*>(__res));
 }
 
 //! @overload
@@ -1011,7 +1012,7 @@ template <class _Tp, class... _Properties>
 {
   static_assert(::cuda::std::is_void_v<_Tp> || ::cuda::mr::synchronous_resource_with<_Tp, _Properties...>,
                 "_Tp must be void or satisfy synchronous_resource_with<_Tp, _Properties...>");
-  return ::cuda::__any_cast<_Tp>(__res);
+  return ::cuda::__any_cast<_Tp>(static_cast<::cuda::__basic_any<__iresource<_Properties...>>*>(__res));
 }
 
 //! @overload
@@ -1021,7 +1022,7 @@ template <class _Tp, class... _Properties>
 {
   static_assert(::cuda::std::is_void_v<_Tp> || ::cuda::mr::synchronous_resource_with<_Tp, _Properties...>,
                 "_Tp must be void or satisfy synchronous_resource_with<_Tp, _Properties...>");
-  return ::cuda::__any_cast<_Tp>(__res);
+  return ::cuda::__any_cast<_Tp>(static_cast<const ::cuda::__basic_any<__iresource<_Properties...>>*>(__res));
 }
 
 //! @overload
@@ -1030,7 +1031,7 @@ template <class _Tp, class... _Properties>
 {
   static_assert(::cuda::std::is_void_v<_Tp> || ::cuda::mr::resource_with<_Tp, _Properties...>,
                 "_Tp must be void or satisfy resource_with<_Tp, _Properties...>");
-  return ::cuda::__any_cast<_Tp>(__res);
+  return ::cuda::__any_cast<_Tp>(static_cast<::cuda::__basic_any<__iasync_resource<_Properties...>&>*>(__res));
 }
 
 //! @overload
@@ -1039,7 +1040,7 @@ template <class _Tp, class... _Properties>
 {
   static_assert(::cuda::std::is_void_v<_Tp> || ::cuda::mr::resource_with<_Tp, _Properties...>,
                 "_Tp must be void or satisfy resource_with<_Tp, _Properties...>");
-  return ::cuda::__any_cast<_Tp>(__res);
+  return ::cuda::__any_cast<_Tp>(static_cast<const ::cuda::__basic_any<__iasync_resource<_Properties...>&>*>(__res));
 }
 
 //! @overload
@@ -1048,7 +1049,7 @@ template <class _Tp, class... _Properties>
 {
   static_assert(::cuda::std::is_void_v<_Tp> || ::cuda::mr::synchronous_resource_with<_Tp, _Properties...>,
                 "_Tp must be void or satisfy synchronous_resource_with<_Tp, _Properties...>");
-  return ::cuda::__any_cast<_Tp>(__res);
+  return ::cuda::__any_cast<_Tp>(static_cast<::cuda::__basic_any<__iresource<_Properties...>&>*>(__res));
 }
 
 //! @overload
@@ -1058,7 +1059,7 @@ template <class _Tp, class... _Properties>
 {
   static_assert(::cuda::std::is_void_v<_Tp> || ::cuda::mr::synchronous_resource_with<_Tp, _Properties...>,
                 "_Tp must be void or satisfy synchronous_resource_with<_Tp, _Properties...>");
-  return ::cuda::__any_cast<_Tp>(__res);
+  return ::cuda::__any_cast<_Tp>(static_cast<const ::cuda::__basic_any<__iresource<_Properties...>&>*>(__res));
 }
 
 // ── dynamic_resource_cast ───────────────────────────────────────────────────

libcudacxx/test/libcudacxx/cuda/utility/basic_any.pass.cpp

@@ -675,7 +675,7 @@ struct HasBoth
   int val;
 };
 
-_CCCL_HOST void test_iset_dynamic_cast()
+_CCCL_HOST_DEVICE void test_iset_dynamic_cast()
 {
   // Start with both interfaces, narrow to one, verify cross-cast to the other fails
   cuda::__basic_any<iset_ab> ab{::cuda::std::in_place_type<HasBoth>, 7};