Include RAPIDS.cmake to WAR network issues on CI. (#236)

See also https://github.com/rapidsai/rmm/pull/1886

cmake/NVBenchRapidsCMake.cmake

@@ -1,12 +1,13 @@
 # Called before project(...)
 macro(nvbench_load_rapids_cmake)
-  if(NOT EXISTS "${CMAKE_CURRENT_BINARY_DIR}/NVBENCH_RAPIDS.cmake")
-    file(DOWNLOAD
-      https://raw.githubusercontent.com/rapidsai/rapids-cmake/branch-25.04/RAPIDS.cmake
-      "${CMAKE_CURRENT_BINARY_DIR}/NVBENCH_RAPIDS.cmake"
-    )
-  endif()
-  include("${CMAKE_CURRENT_BINARY_DIR}/NVBENCH_RAPIDS.cmake")
+  # - Including directly, see https://github.com/rapidsai/rmm/pull/1886
+  # - Versioned download URL:
+  #   https://raw.githubusercontent.com/rapidsai/rapids-cmake/branch-XX.YY/RAPIDS.cmake
+  # - This macro is always called before project() in the root CMakeLists.txt, so:
+  #   - we can't just use NVBench_SOURCE_DIR, it's not defined yet.
+  #   - We can't rely on CMAKE_CURRENT_LIST_DIR because of macro expansion.
+  #   - We can fallback to CURRENT_SOURCE_DIR because we know this will be expanded in the root:
+  include("${CMAKE_CURRENT_SOURCE_DIR}/cmake/RAPIDS.cmake")
 
   include(rapids-cmake)
   include(rapids-cpm)

cmake/RAPIDS.cmake

@@ -0,0 +1,94 @@
+#=============================================================================
+# Copyright (c) 2021-2025, 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.
+#=============================================================================
+#
+# This is the preferred entry point for projects using rapids-cmake
+#
+
+# Allow users to control which version is used
+if(NOT rapids-cmake-version)
+  # Define a default version if the user doesn't set one
+  set(rapids-cmake-version 25.04)
+endif()
+
+# Allow users to control which GitHub repo is fetched
+if(NOT rapids-cmake-repo)
+  # Define a default repo if the user doesn't set one
+  set(rapids-cmake-repo rapidsai/rapids-cmake)
+endif()
+
+# Allow users to control which branch is fetched
+if(NOT rapids-cmake-branch)
+  # Define a default branch if the user doesn't set one
+  set(rapids-cmake-branch "branch-${rapids-cmake-version}")
+endif()
+
+# Allow users to control the exact URL passed to FetchContent
+if(NOT rapids-cmake-url)
+  # Construct a default URL if the user doesn't set one
+  set(rapids-cmake-url "https://github.com/${rapids-cmake-repo}/")
+
+  # In order of specificity
+  if(rapids-cmake-fetch-via-git)
+    if(rapids-cmake-sha)
+      # An exact git SHA takes precedence over anything
+      set(rapids-cmake-value-to-clone "${rapids-cmake-sha}")
+    elseif(rapids-cmake-tag)
+      # Followed by a git tag name
+      set(rapids-cmake-value-to-clone "${rapids-cmake-tag}")
+    else()
+      # Or if neither of the above two were defined, use a branch
+      set(rapids-cmake-value-to-clone "${rapids-cmake-branch}")
+    endif()
+  else()
+    if(rapids-cmake-sha)
+      # An exact git SHA takes precedence over anything
+      set(rapids-cmake-value-to-clone "archive/${rapids-cmake-sha}.zip")
+    elseif(rapids-cmake-tag)
+      # Followed by a git tag name
+      set(rapids-cmake-value-to-clone "archive/refs/tags/${rapids-cmake-tag}.zip")
+    else()
+      # Or if neither of the above two were defined, use a branch
+      set(rapids-cmake-value-to-clone "archive/refs/heads/${rapids-cmake-branch}.zip")
+    endif()
+  endif()
+endif()
+
+if(POLICY CMP0135)
+  cmake_policy(PUSH)
+  cmake_policy(SET CMP0135 NEW)
+endif()
+include(FetchContent)
+if(rapids-cmake-fetch-via-git)
+  FetchContent_Declare(rapids-cmake
+    GIT_REPOSITORY "${rapids-cmake-url}"
+    GIT_TAG "${rapids-cmake-value-to-clone}")
+else()
+  string(APPEND rapids-cmake-url "${rapids-cmake-value-to-clone}")
+  FetchContent_Declare(rapids-cmake URL "${rapids-cmake-url}")
+endif()
+if(POLICY CMP0135)
+  cmake_policy(POP)
+endif()
+FetchContent_GetProperties(rapids-cmake)
+if(rapids-cmake_POPULATED)
+  # Something else has already populated rapids-cmake, only thing
+  # we need to do is setup the CMAKE_MODULE_PATH
+  if(NOT "${rapids-cmake-dir}" IN_LIST CMAKE_MODULE_PATH)
+    list(APPEND CMAKE_MODULE_PATH "${rapids-cmake-dir}")
+  endif()
+else()
+  FetchContent_MakeAvailable(rapids-cmake)
+endif()