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  • # Written in 2016 by Henrik Steffen Gaßmann <henrik@gassmann.onl>
    #
    # To the extent possible under law, the author(s) have dedicated all
    # copyright and related and neighboring rights to this software to the
    # public domain worldwide. This software is distributed without any warranty.
    #
    # You should have received a copy of the CC0 Public Domain Dedication
    # along with this software. If not, see
    #
    #     http://creativecommons.org/publicdomain/zero/1.0/
    #
    ########################################################################
    # Tries to find the local libsodium installation.
    #
    # On Windows the sodium_DIR environment variable is used as a default
    # hint which can be overridden by setting the corresponding cmake variable.
    #
    # Once done the following variables will be defined:
    #
    #   sodium_FOUND
    #   sodium_INCLUDE_DIR
    #   sodium_LIBRARY_DEBUG
    #   sodium_LIBRARY_RELEASE
    #
    #
    # Furthermore an imported "sodium" target is created.
    #
    
    if (CMAKE_C_COMPILER_ID STREQUAL "GNU"
        OR CMAKE_C_COMPILER_ID STREQUAL "Clang")
        set(_GCC_COMPATIBLE 1)
    endif()
    
    # static library option
    if (NOT DEFINED sodium_USE_STATIC_LIBS)
        option(sodium_USE_STATIC_LIBS "enable to statically link against sodium" OFF)
    endif()
    if(NOT (sodium_USE_STATIC_LIBS EQUAL sodium_USE_STATIC_LIBS_LAST))
        unset(sodium_LIBRARY CACHE)
        unset(sodium_LIBRARY_DEBUG CACHE)
        unset(sodium_LIBRARY_RELEASE CACHE)
        unset(sodium_DLL_DEBUG CACHE)
        unset(sodium_DLL_RELEASE CACHE)
        set(sodium_USE_STATIC_LIBS_LAST ${sodium_USE_STATIC_LIBS} CACHE INTERNAL "internal change tracking variable")
    endif()
    
    
    ########################################################################
    # UNIX
    if (UNIX)
        # import pkg-config
        find_package(PkgConfig QUIET)
        if (PKG_CONFIG_FOUND)
            pkg_check_modules(sodium_PKG QUIET libsodium)
        endif()
    
        if(sodium_USE_STATIC_LIBS)
            foreach(_libname ${sodium_PKG_STATIC_LIBRARIES})
                if (NOT _libname MATCHES "^lib.*\\.a$") # ignore strings already ending with .a
                    list(INSERT sodium_PKG_STATIC_LIBRARIES 0 "lib${_libname}.a")
                endif()
            endforeach()
            list(REMOVE_DUPLICATES sodium_PKG_STATIC_LIBRARIES)
    
            # if pkgconfig for libsodium doesn't provide
            # static lib info, then override PKG_STATIC here..
            if (sodium_PKG_STATIC_LIBRARIES STREQUAL "")
                set(sodium_PKG_STATIC_LIBRARIES libsodium.a)
            endif()
    
            set(XPREFIX sodium_PKG_STATIC)
        else()
            if (sodium_PKG_LIBRARIES STREQUAL "")
                set(sodium_PKG_LIBRARIES sodium)
            endif()
    
            set(XPREFIX sodium_PKG)
        endif()
    
        find_path(sodium_INCLUDE_DIR sodium.h
            HINTS ${${XPREFIX}_INCLUDE_DIRS}
        )
        find_library(sodium_LIBRARY_DEBUG NAMES ${${XPREFIX}_LIBRARIES}
            HINTS ${${XPREFIX}_LIBRARY_DIRS}
        )
        find_library(sodium_LIBRARY_RELEASE NAMES ${${XPREFIX}_LIBRARIES}
            HINTS ${${XPREFIX}_LIBRARY_DIRS}
        )
    
    
    ########################################################################
    # Windows
    elseif (WIN32)
        set(sodium_DIR "$ENV{sodium_DIR}" CACHE FILEPATH "sodium install directory")
        mark_as_advanced(sodium_DIR)
    
        find_path(sodium_INCLUDE_DIR sodium.h
            HINTS ${sodium_DIR}
            PATH_SUFFIXES include
        )
    
        if (MSVC)
            # detect target architecture
            file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/arch.c" [=[
                #if defined _M_IX86
                #error ARCH_VALUE x86_32
                #elif defined _M_X64
                #error ARCH_VALUE x86_64
                #endif
                #error ARCH_VALUE unknown
            ]=])
            try_compile(_UNUSED_VAR "${CMAKE_CURRENT_BINARY_DIR}" "${CMAKE_CURRENT_BINARY_DIR}/arch.c"
                OUTPUT_VARIABLE _COMPILATION_LOG
            )
            string(REGEX REPLACE ".*ARCH_VALUE ([a-zA-Z0-9_]+).*" "\\1" _TARGET_ARCH "${_COMPILATION_LOG}")
    
            # construct library path
            if (_TARGET_ARCH STREQUAL "x86_32")
                string(APPEND _PLATFORM_PATH "Win32")
            elseif(_TARGET_ARCH STREQUAL "x86_64")
                string(APPEND _PLATFORM_PATH "x64")
            else()
                message(FATAL_ERROR "the ${_TARGET_ARCH} architecture is not supported by Findsodium.cmake.")
            endif()
            string(APPEND _PLATFORM_PATH "/$$CONFIG$$")
    
            if (MSVC_VERSION LESS 1900)
                math(EXPR _VS_VERSION "${MSVC_VERSION} / 10 - 60")
            else()
                math(EXPR _VS_VERSION "${MSVC_VERSION} / 10 - 50")
            endif()
            string(APPEND _PLATFORM_PATH "/v${_VS_VERSION}")
    
            if (sodium_USE_STATIC_LIBS)
                string(APPEND _PLATFORM_PATH "/static")
            else()
                string(APPEND _PLATFORM_PATH "/dynamic")
            endif()
    
            string(REPLACE "$$CONFIG$$" "Debug" _DEBUG_PATH_SUFFIX "${_PLATFORM_PATH}")
            string(REPLACE "$$CONFIG$$" "Release" _RELEASE_PATH_SUFFIX "${_PLATFORM_PATH}")
    
            find_library(sodium_LIBRARY_DEBUG libsodium.lib
                HINTS ${sodium_DIR}
                PATH_SUFFIXES ${_DEBUG_PATH_SUFFIX}
            )
            find_library(sodium_LIBRARY_RELEASE libsodium.lib
                HINTS ${sodium_DIR}
                PATH_SUFFIXES ${_RELEASE_PATH_SUFFIX}
            )
            if (NOT sodium_USE_STATIC_LIBS)
                set(CMAKE_FIND_LIBRARY_SUFFIXES_BCK ${CMAKE_FIND_LIBRARY_SUFFIXES})
                set(CMAKE_FIND_LIBRARY_SUFFIXES ".dll")
                find_library(sodium_DLL_DEBUG libsodium
                    HINTS ${sodium_DIR}
                    PATH_SUFFIXES ${_DEBUG_PATH_SUFFIX}
                )
                find_library(sodium_DLL_RELEASE libsodium
                    HINTS ${sodium_DIR}
                    PATH_SUFFIXES ${_RELEASE_PATH_SUFFIX}
                )
                set(CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES_BCK})
            endif()
    
        elseif(_GCC_COMPATIBLE)
            if (sodium_USE_STATIC_LIBS)
                find_library(sodium_LIBRARY_DEBUG libsodium.a
                    HINTS ${sodium_DIR}
                    PATH_SUFFIXES lib
                )
                find_library(sodium_LIBRARY_RELEASE libsodium.a
                    HINTS ${sodium_DIR}
                    PATH_SUFFIXES lib
                )
            else()
                find_library(sodium_LIBRARY_DEBUG libsodium.dll.a
                    HINTS ${sodium_DIR}
                    PATH_SUFFIXES lib
                )
                find_library(sodium_LIBRARY_RELEASE libsodium.dll.a
                    HINTS ${sodium_DIR}
                    PATH_SUFFIXES lib
                )
    
                file(GLOB _DLL
                    LIST_DIRECTORIES false
                    RELATIVE "${sodium_DIR}/bin"
                    "${sodium_DIR}/bin/libsodium*.dll"
                )
                find_library(sodium_DLL_DEBUG ${_DLL} libsodium
                    HINTS ${sodium_DIR}
                    PATH_SUFFIXES bin
                )
                find_library(sodium_DLL_RELEASE ${_DLL} libsodium
                    HINTS ${sodium_DIR}
                    PATH_SUFFIXES bin
                )
            endif()
        else()
            message(FATAL_ERROR "this platform is not supported by FindSodium.cmake")
        endif()
    
    
    ########################################################################
    # unsupported
    else()
        message(FATAL_ERROR "this platform is not supported by FindSodium.cmake")
    endif()
    
    
    ########################################################################
    # common stuff
    
    # extract sodium version
    if (sodium_INCLUDE_DIR)
    
        set(_VERSION_HEADER "${sodium_INCLUDE_DIR}/sodium/version.h")
        if (EXISTS "${_VERSION_HEADER}")
    
            file(READ "${_VERSION_HEADER}" _VERSION_HEADER_CONTENT)
            string(REGEX REPLACE ".*#[ \t]*define[ \t]*SODIUM_VERSION_STRING[ \t]*\"([^\n]*)\".*" "\\1"
                sodium_VERSION "${_VERSION_HEADER_CONTENT}")
    
            set(sodium_VERSION "${sodium_VERSION}")
    
        endif()
    endif()
    
    # communicate results
    include(FindPackageHandleStandardArgs)
    find_package_handle_standard_args(sodium
        REQUIRED_VARS
            sodium_LIBRARY_RELEASE
            sodium_LIBRARY_DEBUG
            sodium_INCLUDE_DIR
        VERSION_VAR
            sodium_VERSION
    )
    
    # mark file paths as advanced
    mark_as_advanced(sodium_INCLUDE_DIR)
    mark_as_advanced(sodium_LIBRARY_DEBUG)
    mark_as_advanced(sodium_LIBRARY_RELEASE)
    if (WIN32)
        mark_as_advanced(sodium_DLL_DEBUG)
        mark_as_advanced(sodium_DLL_RELEASE)
    endif()
    
    # create imported target
    if(sodium_USE_STATIC_LIBS)
        set(_LIB_TYPE STATIC)
    else()
        set(_LIB_TYPE SHARED)
    endif()
    add_library(sodium ${_LIB_TYPE} IMPORTED)
    
    set_target_properties(sodium PROPERTIES
        INTERFACE_INCLUDE_DIRECTORIES "${sodium_INCLUDE_DIR}"
        IMPORTED_LINK_INTERFACE_LANGUAGES "C"
    )
    
    if (sodium_USE_STATIC_LIBS)
        set_target_properties(sodium PROPERTIES
            INTERFACE_COMPILE_DEFINITIONS "SODIUM_STATIC"
            IMPORTED_LOCATION "${sodium_LIBRARY_RELEASE}"
            IMPORTED_LOCATION_DEBUG "${sodium_LIBRARY_DEBUG}"
        )
    else()
        if (UNIX)
            set_target_properties(sodium PROPERTIES
                IMPORTED_LOCATION "${sodium_LIBRARY_RELEASE}"
                IMPORTED_LOCATION_DEBUG "${sodium_LIBRARY_DEBUG}"
            )
        elseif (WIN32)
            set_target_properties(sodium PROPERTIES
                IMPORTED_IMPLIB "${sodium_LIBRARY_RELEASE}"
                IMPORTED_IMPLIB_DEBUG "${sodium_LIBRARY_DEBUG}"
            )
            if (NOT (sodium_DLL_DEBUG MATCHES ".*-NOTFOUND"))
                set_target_properties(sodium PROPERTIES
                    IMPORTED_LOCATION_DEBUG "${sodium_DLL_DEBUG}"
                )
            endif()
            if (NOT (sodium_DLL_RELEASE MATCHES ".*-NOTFOUND"))
                set_target_properties(sodium PROPERTIES
                    IMPORTED_LOCATION_RELWITHDEBINFO "${sodium_DLL_RELEASE}"
                    IMPORTED_LOCATION_MINSIZEREL "${sodium_DLL_RELEASE}"
                    IMPORTED_LOCATION_RELEASE "${sodium_DLL_RELEASE}"
                )
            endif()
        endif()
    endif()