Use `FetchContent` over CPM as it's bundled with CMake

Thanks @ggerganov for the suggestion

cmake/CPM.cmake

@@ -1,25 +0,0 @@
-# SPDX-License-Identifier: MIT
-#
-# SPDX-FileCopyrightText: Copyright (c) 2019-2023 Lars Melchior and contributors
-
-# TODO: Remove this file once CCCL 3.2 is released & bundled with the CUDA Toolkit
-set(CPM_DOWNLOAD_VERSION 0.42.0)
-set(CPM_HASH_SUM "2020b4fc42dba44817983e06342e682ecfc3d2f484a581f11cc5731fbe4dce8a")
-
-if(CPM_SOURCE_CACHE)
-  set(CPM_DOWNLOAD_LOCATION "${CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
-elseif(DEFINED ENV{CPM_SOURCE_CACHE})
-  set(CPM_DOWNLOAD_LOCATION "$ENV{CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
-else()
-  set(CPM_DOWNLOAD_LOCATION "${CMAKE_BINARY_DIR}/cmake/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
-endif()
-
-# Expand relative path. This is important if the provided path contains a tilde (~)
-get_filename_component(CPM_DOWNLOAD_LOCATION ${CPM_DOWNLOAD_LOCATION} ABSOLUTE)
-
-file(DOWNLOAD
-     https://github.com/cpm-cmake/CPM.cmake/releases/download/v${CPM_DOWNLOAD_VERSION}/CPM.cmake
-     ${CPM_DOWNLOAD_LOCATION} EXPECTED_HASH SHA256=${CPM_HASH_SUM}
-)
-
-include(${CPM_DOWNLOAD_LOCATION})

ggml/src/ggml-cuda/CMakeLists.txt

@@ -4,13 +4,16 @@ find_package(CUDAToolkit)
 
 # Remove once CCCL 3.2 has been released and bundled with CUDA Toolkit
 if (GGML_CUDA_CUB_3DOT2)
-    include(../../../cmake/CPM.cmake)
+    include(FetchContent)
-    # This will automatically clone CCCL from GitHub and make the exported cmake targets available
+
-    CPMAddPackage(
+    FetchContent_Declare(
-        NAME CCCL
+        CCCL
-        GITHUB_REPOSITORY nvidia/cccl
+        GIT_REPOSITORY https://github.com/nvidia/cccl.git
-        GIT_TAG v3.2.0-rc0 # Fetches the latest commit on the main branch
+        GIT_TAG        v3.2.0-rc0
+        GIT_SHALLOW    TRUE
     )
+
+    FetchContent_MakeAvailable(CCCL)
 endif()
 
 if (CUDAToolkit_FOUND)