cmake_minimum_required (VERSION 2.8.11)

project (OPENCL_ICD_LOADER)
include (GNUInstallDirs)
find_package (Threads REQUIRED)

# The option below allows building the ICD Loader library as a shared library
# (ON, default) or a static library (OFF).
#
# Khronos OpenCL Working Group strongly recommends building and using the ICD
# loader as a shared library due to the following benefits:
#
# 1. The shared library can be updated independent of the application. This
#    allows releasing new fixes and features in the ICD loader without updating
#    the application.
#
#    In rare cases when there are backward-incompatible changes to the ICD
#    loader (due to platform requirements, for instance), using a shared
#    library allows updating the library to make the transition seamless to
#    installed applications.
#
# 2. On platforms that require the ICD mechanism there are multiple vendors
#    shipping their OpenCL implementations. The vendor installers collaborate
#    to make sure that the installed ICD shared library version is suitable for
#    working with all vendor implementations installed on the system.
#
#    If applications statically link to ICD Loader then that version of the ICD
#    loader may not work with one or more installed vendor implementations.
#
# Using the OpenCL ICD loader as a static library is NOT recommended for
# end-user installations in general. However in some controlled environments it
# may be useful to simplify the build and distribution of the application. E.g.
# in test farms, or in cases where the end-user system configs are known in
# advance. Use it with discretion.
option (BUILD_SHARED_LIBS "Build shared libs" ON)

include(CheckFunctionExists)
check_function_exists(secure_getenv HAVE_SECURE_GETENV)
check_function_exists(__secure_getenv HAVE___SECURE_GETENV)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/loader/icd_cmake_config.h.in
    ${CMAKE_CURRENT_BINARY_DIR}/icd_cmake_config.h)

set (OPENCL_ICD_LOADER_SOURCES
    loader/icd.c
    loader/icd.h
    loader/icd_dispatch.c
    loader/icd_dispatch.h
    loader/icd_envvars.h
    loader/icd_platform.h)

if (WIN32)
    list (APPEND OPENCL_ICD_LOADER_SOURCES 
        loader/windows/icd_windows.c
        loader/windows/icd_windows.h
        loader/windows/icd_windows_dxgk.c
        loader/windows/icd_windows_dxgk.h
        loader/windows/icd_windows_envvars.c
        loader/windows/icd_windows_hkr.c
        loader/windows/icd_windows_hkr.h
        loader/windows/OpenCL.def
        loader/windows/OpenCL.rc)
    # Only add the DXSDK include directory if the environment variable is
    # defined.  Since the DXSDK has merged into the Windows SDK, this is
    # only required in rare cases.
    if (DEFINED ENV{DXSDK_DIR} AND NOT (MINGW OR MSYS OR CYGWIN))
        include_directories ($ENV{DXSDK_DIR}/Include)
    endif ()
else ()
    list (APPEND OPENCL_ICD_LOADER_SOURCES
        loader/linux/icd_linux.c
        loader/linux/icd_linux_envvars.c
        loader/linux/icd_exports.map)
endif ()

set (OPENCL_ICD_LOADER_HEADERS_DIR ${CMAKE_CURRENT_SOURCE_DIR}/inc CACHE PATH "Path to OpenCL Headers")

add_library (OpenCL ${OPENCL_ICD_LOADER_SOURCES})
set_target_properties (OpenCL PROPERTIES VERSION "1.2" SOVERSION "1")

if (WIN32)
    target_link_libraries (OpenCL cfgmgr32.lib)

    option (OPENCL_ICD_LOADER_REQUIRE_WDK "Build with D3DKMT support, which requires the Windows WDK." ON)
    if (OPENCL_ICD_LOADER_REQUIRE_WDK)
        if(DEFINED ENV{WDKContentRoot})
            file(GLOB D3DKMT_HEADER "$ENV{WDKContentRoot}/Include/*/km/d3dkmthk.h")
        else()
            file(GLOB D3DKMT_HEADER "$ENV{HOMEDRIVE}/Program Files */Windows Kits/10/Include/*/km/d3dkmthk.h")
        endif()

        if(D3DKMT_HEADER)
            list(GET D3DKMT_HEADER -1 LATEST_D3DKMT_HEADER)
            get_filename_component(WDK_DIRECTORY ${LATEST_D3DKMT_HEADER} DIRECTORY)
            get_filename_component(WDK_DIRECTORY ${WDK_DIRECTORY} DIRECTORY)
            message(STATUS "Found the Windows WDK in: ${WDK_DIRECTORY}")
            target_compile_definitions(OpenCL PRIVATE OPENCL_ICD_LOADER_REQUIRE_WDK)
            target_include_directories(OpenCL PRIVATE ${WDK_DIRECTORY}/um)
            target_include_directories(OpenCL PRIVATE ${WDK_DIRECTORY}/km)
            target_include_directories(OpenCL PRIVATE ${WDK_DIRECTORY}/shared)
        else()
            message(FATAL_ERROR "The Windows WDK was not found. Consider disabling OPENCL_ICD_LOADER_REQUIRE_WDK. Aborting.")
        endif()
    endif()

    if(NOT USE_DYNAMIC_VCXX_RUNTIME)
        string(REPLACE "/MD" "/MT" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
        string(REPLACE "/MD" "/MT" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
        string(REPLACE "/MD" "/MT" CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL}")
        string(REPLACE "/MD" "/MT" CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}")
        string(REPLACE "/MD" "/MT" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
        string(REPLACE "/MD" "/MT" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
        string(REPLACE "/MDd" "/MTd" CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
        string(REPLACE "/MDd" "/MTd" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
    endif()
else()
    if (APPLE)
        target_link_libraries (OpenCL ${CMAKE_THREAD_LIBS_INIT})
    else ()
        set_target_properties (OpenCL PROPERTIES LINK_FLAGS "-Wl,--version-script -Wl,${CMAKE_CURRENT_SOURCE_DIR}/loader/linux/icd_exports.map")
        target_link_libraries (OpenCL ${CMAKE_THREAD_LIBS_INIT})
    endif ()
endif ()

include_directories (${OPENCL_ICD_LOADER_HEADERS_DIR})
add_definitions (-DCL_TARGET_OPENCL_VERSION=220)

target_include_directories (OpenCL PRIVATE ${CMAKE_CURRENT_BINARY_DIR} loader)
target_link_libraries (OpenCL ${CMAKE_DL_LIBS})

include (CTest)
if (BUILD_TESTING)
    add_subdirectory (test)
endif()

install (TARGETS OpenCL
    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})