chore: import upstream snapshot with attribution

cmake/modules/FetchCCCL.cmake

@@ -0,0 +1,38 @@
+# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+#
+# 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_guard()
+
+set(_cccl_default_repo "https://github.com/NVIDIA/cccl.git")
+
+
+set(CCCL_REPO ${_cccl_default_repo} CACHE STRING "The base project URL to FetchContent_Declare for CCCL" )
+set(CCCL_TAG "v3.4.0-rc0" CACHE STRING "The commit hash to FetchContent_Declare for CCCL")
+
+# We use this directory to ensure we only fetch a single copy of dependencies, even between builds.
+# $HOME/storage is expected to be mounted from the host for developers.
+set(TRT_THIRD_PARTY_DL_DIR "$ENV{HOME}/storage" CACHE PATH "Directory to download third party dependencies to")
+
+FetchContent_Declare(
+    cccl
+    PREFIX         "${CMAKE_BINARY_DIR}/third_party/cccl"
+    GIT_REPOSITORY ${CCCL_REPO}
+    GIT_TAG        ${CCCL_TAG}
+    GIT_SHALLOW    TRUE
+    SOURCE_DIR     "${TRT_THIRD_PARTY_DL_DIR}/cccl/${CCCL_TAG}"
+    EXCLUDE_FROM_ALL
+)
+
+FetchContent_MakeAvailable(cccl)