#
# SPDX-FileCopyrightText: Copyright (c) 1993-2026 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.
#

cmake_minimum_required(VERSION 3.31 FATAL_ERROR)

# Default to building for the local GPU. Must be set BEFORE project(),
# otherwise project()'s CUDA language enablement initializes
# CMAKE_CUDA_ARCHITECTURES to the toolkit's lowest supported SM
# (typically sm_75), and any later `if(NOT DEFINED)` guard misfires.
# `all` is not a substitute: it caps at sm_90 for CUDA >= 12.0
# (https://github.com/Kitware/CMake/blob/v3.31.6/Modules/Internal/CMakeCUDAArchitecturesAll.cmake#L65-L77),
# missing Blackwell/Drive-Thor/Spark, and the PTX fallback fails on
# embedded/safety drivers (e.g. DriveOS QNX) that lack JIT.
if(NOT DEFINED CMAKE_CUDA_ARCHITECTURES)
    set(CMAKE_CUDA_ARCHITECTURES native)
endif()

project(CircPadPlugin LANGUAGES CXX CUDA)

find_package(CUDAToolkit REQUIRED)

if(NOT MSVC)
    # Enable all compile warnings
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-long-long -pedantic -Wno-deprecated-declarations")
    set(CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} -Xcompiler -Wno-deprecated-declarations")
endif()

# Sets variable to a value if variable is unset.
macro(set_ifndef var val)
    if(NOT ${var})
        set(${var} ${val})
    endif()
    message(STATUS "Configurable variable ${var} set to ${${var}}")
endmacro()

# -------- CONFIGURATION --------
if(NOT MSVC)
    set_ifndef(TRT_LIB /usr/lib/x86_64-linux-gnu)
    set_ifndef(TRT_INCLUDE /usr/include/x86_64-linux-gnu)
endif()

message("\nThe following variables are derived from the values of the previous variables unless provided explicitly:\n")

find_library(
    _NVINFER_LIB nvinfer
    HINTS ${TRT_LIB}
    PATH_SUFFIXES lib lib64)
set_ifndef(NVINFER_LIB ${_NVINFER_LIB})

# -------- BUILDING --------

add_library(circ_pad_plugin SHARED ${CMAKE_SOURCE_DIR}/circ_plugin_cpp/circ_pad_plugin.cu)
target_include_directories(
    circ_pad_plugin
    PUBLIC ${CUDAToolkit_INCLUDE_DIRS}
    PUBLIC ${TRT_INCLUDE})

set_property(TARGET circ_pad_plugin PROPERTY CUDA_STANDARD 17)

target_link_libraries(circ_pad_plugin PRIVATE ${NVINFER_LIB})
target_link_libraries(circ_pad_plugin PRIVATE CUDA::cuda_driver)