##===----------------------------------------------------------------------===##
#
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#
##===----------------------------------------------------------------------===##
#
# Build a plugin for a CUDA machine if available.
#
##===----------------------------------------------------------------------===##
set(LIBOMPTARGET_BUILD_CUDA_PLUGIN TRUE CACHE BOOL
  "Whether to build CUDA plugin")
if (NOT LIBOMPTARGET_BUILD_CUDA_PLUGIN)
  libomptarget_say("Not building CUDA NextGen offloading plugin: LIBOMPTARGET_BUILD_CUDA_PLUGIN is false")
  return()
endif()

if (NOT(CMAKE_SYSTEM_PROCESSOR MATCHES "(x86_64)|(ppc64le)|(aarch64)$" AND CMAKE_SYSTEM_NAME MATCHES "Linux"))
  libomptarget_say("Not building CUDA NextGen offloading plugin: only support CUDA in Linux x86_64, ppc64le, or aarch64 hosts.")
  return()
endif()

libomptarget_say("Building CUDA NextGen offloading plugin.")

# Define the suffix for the runtime messaging dumps.
add_definitions("-DTARGET_NAME=CUDA")

# Define debug prefix. TODO: This should be automatized in the Debug.h but it
# requires changing the original plugins.
add_definitions(-DDEBUG_PREFIX="TARGET CUDA RTL")

set(LIBOMPTARGET_DLOPEN_LIBCUDA OFF)
option(LIBOMPTARGET_FORCE_DLOPEN_LIBCUDA "Build with dlopened libcuda" ${LIBOMPTARGET_DLOPEN_LIBCUDA})

set(LIBOMPTARGET_CAN_LINK_LIBCUDA FALSE)
if (LIBOMPTARGET_DEP_CUDA_FOUND AND LIBOMPTARGET_DEP_CUDA_DRIVER_FOUND)
  set(LIBOMPTARGET_CAN_LINK_LIBCUDA TRUE)
endif()

if (LIBOMPTARGET_CAN_LINK_LIBCUDA AND NOT LIBOMPTARGET_FORCE_DLOPEN_LIBCUDA)
  libomptarget_say("Building CUDA NextGen plugin linked against libcuda")
  include_directories(${LIBOMPTARGET_DEP_CUDA_INCLUDE_DIRS})
  add_llvm_library(omptarget.rtl.cuda.nextgen SHARED

    src/rtl.cpp

    ADDITIONAL_HEADER_DIRS
    ${LIBOMPTARGET_INCLUDE_DIR}

    LINK_LIBS
    PRIVATE
    elf_common
    MemoryManager
    PluginInterface
    ${LIBOMPTARGET_DEP_CUDA_DRIVER_LIBRARIES}
    ${OPENMP_PTHREAD_LIB}
    "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/../exports"
    "-Wl,-z,defs"

    NO_INSTALL_RPATH
  )
else()
  libomptarget_say("Building CUDA NextGen plugin for dlopened libcuda")
  include_directories(../../plugins/cuda/dynamic_cuda)
  add_llvm_library(omptarget.rtl.cuda.nextgen
    SHARED

    src/rtl.cpp
    ../../plugins/cuda/dynamic_cuda/cuda.cpp

    ADDITIONAL_HEADER_DIRS
    ${LIBOMPTARGET_INCLUDE_DIR}

    LINK_LIBS
    PRIVATE
    elf_common
    MemoryManager
    PluginInterface
    ${CMAKE_DL_LIBS}
    ${OPENMP_PTHREAD_LIB}
    "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/../exports"
    "-Wl,-z,defs"

    NO_INSTALL_RPATH
  )
endif()

# Install plugin under the lib destination folder.
install(TARGETS omptarget.rtl.cuda.nextgen LIBRARY DESTINATION "${OPENMP_INSTALL_LIBDIR}")
set_target_properties(omptarget.rtl.cuda.nextgen PROPERTIES
  INSTALL_RPATH "$ORIGIN" BUILD_RPATH "$ORIGIN:${CMAKE_CURRENT_BINARY_DIR}/.."
  CXX_VISIBILITY_PRESET protected)

target_include_directories(omptarget.rtl.cuda.nextgen PRIVATE
  ${LIBOMPTARGET_INCLUDE_DIR}
)