Add deprecation notice to passing "" to CMAKE_CUDA_ARCHITECTURES

rapids-cmake/cuda/detail/architectures_policy.cmake

@@ -41,15 +41,22 @@ function(rapids_cuda_architectures_policy called_from mode_variable)
     if(called_from STREQUAL "FROM_INIT")
       rapids_cmake_policy(DEPRECATED_IN 23.02
                           REMOVED_IN 23.06
-                          MESSAGE "Usage of `ALL` as value for `CMAKE_CUDA_ARCHITECTURES` or the env variable `CUDAARCHS` has been deprecated, use `RAPIDS` instead."
+                          MESSAGE [=[Usage of `ALL` as value for `CMAKE_CUDA_ARCHITECTURES` or the env variable `CUDAARCHS` has been deprecated, use `RAPIDS` instead.]=]
       )
     elseif(called_from STREQUAL "FROM_SET")
       rapids_cmake_policy(DEPRECATED_IN 23.02
                           REMOVED_IN 23.06
-                          MESSAGE "Usage of `ALL` as value passed to `rapids_cuda_set_architectures` has been deprecated, use `RAPIDS` instead."
+                          MESSAGE [=[Usage of `ALL` as value passed to `rapids_cuda_set_architectures` has been deprecated, use `RAPIDS` instead.]=]
       )
     endif()
   endif()
+  if(value STREQUAL "EMPTY_STR")
+    set(new_value "NATIVE")
+    rapids_cmake_policy(DEPRECATED_IN 23.02
+                        REMOVED_IN 23.06
+                        MESSAGE [=[Usage of `""` as value for `CMAKE_CUDA_ARCHITECTURES` has been deprecated, use `NATIVE` instead.]=]
+    )
+  endif()
 
   set(${mode_variable} ${new_value} PARENT_SCOPE)
 endfunction()

rapids-cmake/cuda/init_architectures.cmake

@@ -84,6 +84,8 @@ function(rapids_cuda_init_architectures project_name)
     rapids_cuda_architectures_policy(FROM_INIT cuda_arch_mode)
   elseif(CMAKE_CUDA_ARCHITECTURES STREQUAL "" OR CMAKE_CUDA_ARCHITECTURES STREQUAL "NATIVE")
     set(cuda_arch_mode "NATIVE")
+    set(deprecated_cuda_arch_mode "EMPTY_STR")
+    rapids_cuda_architectures_policy(FROM_INIT deprecated_cuda_arch_mode)
   elseif(NOT (DEFINED ENV{CUDAARCHS} OR DEFINED CMAKE_CUDA_ARCHITECTURES))
     set(cuda_arch_mode "RAPIDS")
   endif()

testing/cuda/CMakeLists.txt

@@ -45,3 +45,6 @@ set(deprecated_message "rapids-cmake policy [deprecated=23.02 removed=23.06]: Us
 add_cmake_config_test( init_arch-all-via-env-deprecated.cmake SHOULD_FAIL "${deprecated_message}")
 add_cmake_config_test( init_arch-all-deprecated.cmake SHOULD_FAIL "${deprecated_message}")
 add_cmake_config_test( set_arch-all-deprecated.cmake SHOULD_FAIL "${deprecated_message}")
+
+set(deprecated_message "rapids-cmake policy [deprecated=23.02 removed=23.06]: Usage of `""`")
+add_cmake_config_test( init_arch-native-via-empty-str-deprecated SHOULD_FAIL "${deprecated_message}")

testing/cuda/init_arch-native-via-empty-str-deprecated/CMakeLists.txt

@@ -0,0 +1,34 @@
+#=============================================================================
+# Copyright (c) 2023, NVIDIA CORPORATION.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#=============================================================================
+include(${rapids-cmake-dir}/cuda/init_architectures.cmake)
+
+cmake_minimum_required(VERSION 3.23.1)
+
+set(CMAKE_CUDA_ARCHITECTURES "")
+set(CMAKE_ERROR_DEPRECATED ON)
+
+rapids_cuda_init_architectures(rapids-project)
+project(rapids-project LANGUAGES CUDA)
+
+if(NOT DEFINED CMAKE_CUDA_ARCHITECTURES)
+  message(FATAL_ERROR "rapids_cuda_init_architectures didn't init CUDA_ARCHITECTURES")
+endif()
+
+if(CMAKE_CUDA_ARCHITECTURES STREQUAL "")
+  message(FATAL_ERROR "rapids_cuda_init_architectures didn't init CUDA_ARCHITECTURES")
+endif()
+
+include("${rapids-cmake-testing-dir}/cuda/validate-cuda-native.cmake")