# SPDX-FileCopyrightText: Copyright (c) 2023 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.

cmake_minimum_required(VERSION 3.18 FATAL_ERROR)

project(CUDAX_SAMPLES CUDA CXX)

# This example uses the CMake Package Manager (CPM) to simplify fetching CCCL from GitHub
# For more information, see https://github.com/cpm-cmake/CPM.cmake
include(cmake/CPM.cmake)

# We define these as variables so they can be overridden in CI to pull from a PR instead of CCCL `main`
# In your project, these variables are unnecessary and you can just use the values directly
set(
  CCCL_REPOSITORY
  "https://github.com/NVIDIA/cccl"
  CACHE STRING
  "Git repository to fetch CCCL from"
)
set(CCCL_TAG "main" CACHE STRING "Git tag/branch to fetch from CCCL repository")

# This will automatically clone CCCL from GitHub and make the exported cmake targets available
CPMAddPackage(
  NAME CCCL
  GIT_REPOSITORY "${CCCL_REPOSITORY}"
  GIT_TAG ${CCCL_TAG}
  # The following is required to make the `CCCL::cudax` target available:
  OPTIONS "CCCL_ENABLE_UNSTABLE ON"
)

# Default to building for the GPU on the current system
if (NOT DEFINED CMAKE_CUDA_ARCHITECTURES)
  set(CMAKE_CUDA_ARCHITECTURES native)
endif()

# If you're building an executable
add_executable(simple_stf simple_stf.cu)

target_link_libraries(simple_stf PUBLIC cuda)

if (CMAKE_CUDA_COMPILER)
  target_compile_options(
    simple_stf
    PUBLIC
      $<$<COMPILE_LANG_AND_ID:CUDA,NVIDIA>:--expt-relaxed-constexpr>
      $<$<COMPILE_LANG_AND_ID:CUDA,NVIDIA>:--extended-lambda>
  )
endif()

target_link_libraries(simple_stf PRIVATE CCCL::CCCL CCCL::cudax)