CMakeLists.txt

cmake_minimum_required(VERSION 3.10)

project(cppyy-backend)
include(ExternalProject)
include(CMakeSystemSpecificInformation)

set(CMAKE_FIND_PACKAGE_SORT_ORDER NATURAL)
set(CMAKE_FIND_PACKAGE_SORT_DIRECTION DEC)

add_library(cppyy-backend SHARED
    clingwrapper/src/clingwrapper.cxx
)

# set_target_properties(cppyy-backend PROPERTIES VERSION ${PROJECT_VERSION})

# set_target_properties(cppyy-backend PROPERTIES PUBLIC_HEADER include/cpp_cppyy.h)

target_include_directories(cppyy-backend PRIVATE clingwrapper/src)


if(DEFINED CppInterOp_DIR)
    set(_interop_install_dir ${CppInterOp_DIR})
else()
    set(_interop_install_dir ${CMAKE_BINARY_DIR}/CppInterOp/install)

    if(DEFINED USE_CLING)
        list(APPEND _interop_cmake_args "-DUSE_CLING=${USE_CLING}")
    endif()

    if(DEFINED Cling_DIR)
        list(APPEND _interop_cmake_args "-DCling_DIR=${Cling_DIR}")
    endif()

    if(DEFINED LLVM_DIR)
        list(APPEND _interop_cmake_args "-DLLVM_DIR=${LLVM_DIR}")
    endif()

    if(DEFINED Clang_DIR)
        list(APPEND _interop_cmake_args "-DClang_DIR=${Clang_DIR}")
    endif()

    list(APPEND _interop_cmake_args "-DCMAKE_INSTALL_PREFIX=${_interop_install_dir}")

    set(_interop_build_type ${CMAKE_CFG_INTDIR})
    set(_interop_cmake_logging_settings
          LOG_DOWNLOAD ON
          LOG_CONFIGURE ON
          LOG_BUILD ON
          LOG_INSTALL ON
          LOG_OUTPUT_ON_FAILURE ON
        )

    ExternalProject_Add(CppInterOp 
        GIT_REPOSITORY https://github.com/compiler-research/CppInterOp.git
        GIT_TAG main
        PREFIX "CppInterOp"
        CMAKE_ARGS ${_interop_cmake_args}
        BUILD_BYPRODUCTS ${_interop_byproducts}
        ${_interop_cmake_logging_settings}
    )

    add_dependencies(libCppInterOp CppInterOp)
endif()

set_source_files_properties(clingwrapper/src/clingwrapper.cxx
  PROPERTIES COMPILE_DEFINITIONS "CPPINTEROP_DIR=\"${_interop_install_dir}\"")

# Link to CppInterOp library. Without this can't build on MacOS due to undefined symbols
target_link_libraries(cppyy-backend ${_interop_install_dir}/lib/libclangCppInterOp${CMAKE_SHARED_LIBRARY_SUFFIX})


target_include_directories(cppyy-backend PUBLIC ${_interop_install_dir}/include)