cmake_minimum_required(VERSION 3.5)
project(TF_CUSTOM_OP)
SET (CMAKE_CXX_STANDARD 11)

message("JULIA=${JULIA}")

IF(JULIA)
ELSE()
find_program(JULIA "julia")
ENDIF()

execute_process(COMMAND ${JULIA} -e "import ADCME; print(ADCME.__STR__)" OUTPUT_VARIABLE JL_OUT)


list(GET JL_OUT 0 BINDIR)
list(GET JL_OUT 1 LIBDIR)
list(GET JL_OUT 2 TF_INC)
list(GET JL_OUT 3 TF_ABI)
list(GET JL_OUT 4 PREFIXDIR)
list(GET JL_OUT 5 CC)
list(GET JL_OUT 6 CXX)
list(GET JL_OUT 7 CMAKE)
list(GET JL_OUT 8 MAKE)
list(GET JL_OUT 9 GIT)
list(GET JL_OUT 10 PYTHON)
list(GET JL_OUT 11 TF_LIB_FILE)
list(GET JL_OUT 12 LIBCUDA)
list(GET JL_OUT 13 CUDA_INC)

message("Python path=${PYTHON}")
message("PREFIXDIR=${PREFIXDIR}")
message("TF_INC=${TF_INC}")
message("TF_ABI=${TF_ABI}")
message("TF_LIB_FILE=${TF_LIB_FILE}")


if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 5.0 OR CMAKE_CXX_COMPILER_VERSION VERSION_EQUAL 5.0)
  SET(CMAKE_CXX_FLAGS "-D_GLIBCXX_USE_CXX11_ABI=${TF_ABI} ${CMAKE_CXX_FLAGS}")
endif()

SET(CMAKE_BUILD_TYPE Release)
if(MSVC)
  if(CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
    string(REGEX REPLACE "/W[0-4]" "/W0" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
  else()
    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W0")
  endif()
  add_definitions(-DNOMINMAX)
  SET(CMAKE_CXX_FLAGS_RELEASE "-DNDEBUG")
else()
  SET(CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG")
endif()

include_directories(${TF_INC} ${PREFIXDIR} ${CUDA_INC})

find_program(_nvidia_smi "nvidia-smi")
if (_nvidia_smi)
  find_package(CUDA QUIET REQUIRED)
  SET(CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}")
  SET(CMAKE_CXX_FLAGS "-O3 ${CMAKE_CXX_FLAGS}")
  SET(CMAKE_CXX_FLAGS "-shared ${CMAKE_CXX_FLAGS}")
  SET(CMAKE_CXX_FLAGS "-fPIC ${CMAKE_CXX_FLAGS}")
  SET(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS};--expt-relaxed-constexpr)
  SET(CUDA_PROPAGATE_HOST_FLAGS ON)
  add_definitions(-DGOOGLE_CUDA)
  message("Compiling GPU-compatible custom operator!")
  cuda_add_library(FemLaplaceScalar SHARED FemLaplaceScalar.cpp FemLaplaceScalar.cu)
else()
  add_library(FemLaplaceScalar SHARED FemLaplaceScalar.cpp)
endif()

set_property(TARGET FemLaplaceScalar PROPERTY POSITION_INDEPENDENT_CODE ON)
target_link_libraries(FemLaplaceScalar ${TF_LIB_FILE})
file(MAKE_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/build)
set_target_properties(FemLaplaceScalar PROPERTIES 
                LIBRARY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/build 
                RUNTIME_OUTPUT_DIRECTORY_RELEASE ${CMAKE_CURRENT_SOURCE_DIR}/build
                ARCHIVE_OUTPUT_DIRECTORY_RELEASE ${CMAKE_CURRENT_SOURCE_DIR}/build)