CMakeLists.txt

# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0.
#

cmake_minimum_required(VERSION 3.15 FATAL_ERROR)

option(LEGACY_BUILD "If enabled, the SDK will use 1.11.0 version of CMake files to build" ON)
if (LEGACY_BUILD)
    message(WARNING "In 1.11 releases, we are releasing experimental alternative building mode."
            "By setting -DLEGACY_MODE=OFF you can test our advances in modern CMake building and "
            "provide early feedback. "
            "The legacy support is set by default in 1.11, when you complete build updating scripts please "
            "update the build flags as mentioned in README.md and set -DLEGACY_BUILD=OFF. "
            "The legacy support will be removed at 1.12.0 release.")

    if (POLICY CMP0077)
        cmake_policy(SET CMP0077 OLD) # CMP0077: option() honors normal variables. Introduced in 3.13
    endif ()
    cmake_policy(SET CMP0091 NEW)

    get_filename_component(AWS_NATIVE_SDK_ROOT "${CMAKE_CURRENT_SOURCE_DIR}" ABSOLUTE)

    # Cmake invocation variables:
    #   BUILD_ONLY - only build project identified by this variable, a semi-colon delimited list, if this is set we will build only the projects listed. Core will always be built as will its unit tests.
    #                    Also if a high level client is specified then we will build its dependencies as well. If a project has tests, the tests will be built.
    #   ADD_CUSTOM_CLIENTS - semi-colon delimited list of format serviceName=<yourServiceName>,version=<theVersionNumber>;serviceName2=<yourOtherServiceName>,version=<versionNumber2>
    #                          to use these arguments, you should add the api definition .normal.json file for your service to the api-description folder in the generator.
    #   NDK_DIR - directory where the android NDK is installed; if not set, the location will be read from the ANDROID_NDK environment variable
    #   CUSTOM_PLATFORM_DIR - directory where custom platform scripts, modules, and source resides
    #   AWS_SDK_ADDITIONAL_LIBRARIES - names of additional libraries to link into aws-cpp-sdk-core in order to support unusual/unanticipated linking setups (static curl against static-something-other-than-openssl for example)

    option(ENABLE_UNITY_BUILD "If enabled, the SDK will be built using a single unified .cpp file for each service library.  Reduces the size of static library binaries on Windows and Linux" ON)
    option(MINIMIZE_SIZE "If enabled, the SDK will be built via a unity aggregation process that results in smaller static libraries; additionally, release binaries will favor size optimizations over speed" OFF)
    option(BUILD_SHARED_LIBS "If enabled, all aws sdk libraries will be build as shared objects; otherwise all Aws libraries will be built as static objects" ON)
    option(FORCE_SHARED_CRT "If enabled, will unconditionally link the standard libraries in dynamically, otherwise the standard library will be linked in based on the BUILD_SHARED_LIBS setting" ON)
    option(SIMPLE_INSTALL "If enabled, removes all the additional indirection (platform/cpu/config) in the bin and lib directories on the install step" ON)
    option(USE_CRT_HTTP_CLIENT "If enabled, the common runtime HTTP client will be used, and the legacy systems such as WinHttp and libcurl will not be built or included" OFF)
    option(NO_HTTP_CLIENT "If enabled, no platform-default http client will be included in the library.  For the library to be used you will need to provide your own platform-specific implementation" OFF)
    option(NO_ENCRYPTION "If enabled, no platform-default encryption will be included in the library.  For the library to be used you will need to provide your own platform-specific implementations" OFF)
    option(USE_IXML_HTTP_REQUEST_2 "If enabled on windows, the com object IXmlHttpRequest2 will be used for the http stack" OFF)
    option(ENABLE_RTTI "Flag to enable/disable rtti within the library" ON)
    option(ENABLE_TESTING "Flag to enable/disable building unit and integration tests" ON)
    option(AUTORUN_UNIT_TESTS "Flag to enable/disable automatically run unit tests after building" ON)
    option(ANDROID_BUILD_CURL "When building for Android, should curl be built as well" ON)
    option(ANDROID_BUILD_OPENSSL "When building for Android, should Openssl be built as well" ON)
    option(ANDROID_BUILD_ZLIB "When building for Android, should Zlib be built as well" ON)
    option(FORCE_CURL "Forces usage of the Curl client rather than the default OS-specific api" OFF)
    option(ENABLE_ADDRESS_SANITIZER "Flags to enable/disable Address Sanitizer for gcc or clang" OFF)
    option(BYPASS_DEFAULT_PROXY "Bypass the machine's default proxy settings when using IXmlHttpRequest2" ON)
    option(BUILD_DEPS "Build third-party dependencies" ON)
    option(USE_OPENSSL "Set this if you want to use your system's OpenSSL 1.0.2/1.1.1 compatible libcrypto" ON)
    option(ENABLE_CURL_LOGGING "If enabled, Curl's internal log will be piped to SDK's logger" ON)
    option(ENABLE_HTTP_CLIENT_TESTING "If enabled, corresponding http client test suites will be built and run" OFF)
    option(ENABLE_FUNCTIONAL_TESTING "If enabled, clients might be generated based on dummy models, and run functional tests as part of unit tests: aws-cpp-sdk-core-tests" OFF)
    option(CUSTOM_MEMORY_MANAGEMENT "If set to ON, generates the sdk project files with custom memory management enabled, otherwise disables it" OFF)
    option(REGENERATE_CLIENTS "If set to ON, all clients being built on this run will be regenerated from the api definitions, this option involves some setup of python, java 8+, and maven" OFF)
    option(ENABLE_VIRTUAL_OPERATIONS "This option usually works with REGENERATE_CLIENTS. \
                                If enabled when doing code generation, operation related functions in service clients will be marked as virtual. \
                                If disabled when doing code generation, virtual will not be added to operation functions and service client class will be marked as final. \
                                If disabled, SDK will add compiler flags '-ffunction-sections -fdata-sections' for gcc and clang when compiling. \
                                You can utilize this feature to work with your linker to reduce binary size of your application on Unix platforms when doing static linking in Release mode." ON)
    option(REGENERATE_DEFAULTS "If set to ON, defaults mode configuration will be regenerated from the JSON definitions, this option involves some setup of python, java 8+, and maven" OFF)
    option(ENABLE_ZLIB_REQUEST_COMPRESSION "For services that support it, request content will be compressed. On by default if dependency available" ON)
    option(DISABLE_INTERNAL_IMDSV1_CALLS "Disables IMDSv1 internal client calls" OFF)

    set(AWS_USER_AGENT_CUSTOMIZATION "" CACHE STRING "User agent extension")
    set(AWS_TEST_REGION "US_EAST_1" CACHE STRING "Region to target integration tests against")
    set(AWS_AUTORUN_LD_LIBRARY_PATH CACHE STRING "Path to append into LD_LIBRARY_PATH for unit tests autorun by cmake. Set this if custom runtime libs are required for overridden dependencies.")
    set(BUILD_ONLY "" CACHE STRING "A semi-colon delimited list of the projects to build")
    set(CPP_STANDARD "11" CACHE STRING "Flag to upgrade the C++ standard used. The default is 11. The minimum is 11.")

    get_property(is_multi_config GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
    if (NOT ${is_multi_config})
        set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Release build by default.")
    endif ()
    if (DISABLE_INTERNAL_IMDSV1_CALLS)
        add_definitions(-DDISABLE_IMDSV1)
    endif ()

    #From https://stackoverflow.com/questions/18968979/how-to-get-colorized-output-with-cmake
    if (NOT WIN32)
        string(ASCII 27 Esc)
        set(ColourReset "${Esc}[m")
        set(ColourBold "${Esc}[1m")
        set(Red "${Esc}[31m")
        set(Green "${Esc}[32m")
        set(Yellow "${Esc}[33m")
        set(Blue "${Esc}[34m")
        set(Magenta "${Esc}[35m")
        set(Cyan "${Esc}[36m")
        set(White "${Esc}[37m")
        set(BoldRed "${Esc}[1;31m")
        set(BoldGreen "${Esc}[1;32m")
        set(BoldYellow "${Esc}[1;33m")
        set(BoldBlue "${Esc}[1;34m")
        set(BoldMagenta "${Esc}[1;35m")
        set(BoldCyan "${Esc}[1;36m")
        set(BoldWhite "${Esc}[1;37m")
    endif ()

    if (NOT USE_OPENSSL)
        message(WARNING "Turning off USE_OPENSSL will install AWS-LC as replacement of OpenSSL in the system default directory. This is an experimental feature. Do not use if you have an OpenSSL installation in your system already.")
    endif ()

    # backwards compatibility with old command line params
    if ("${STATIC_LINKING}" STREQUAL "1")
        set(BUILD_SHARED_LIBS OFF)
    endif ()

    if (MINIMIZE_SIZE)
        message(STATUS "MINIMIZE_SIZE enabled")
        set(ENABLE_UNITY_BUILD ON) # MINIMIZE_SIZE always implies UNITY_BUILD
    endif ()

    set(PYTHON_CMD "python")

    # CMAKE_MODULE_PATH is a CMAKE variable. It contains a list of paths
    # which could be used to search CMAKE modules by "include()" or "find_package()", but the default value is empty.
    # Add ${CMAKE_INSTALL_LIBDIR}/cmake and ${CMAKE_PREFIX_PATH}/lib/cmake to search list
    list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
    set(AWS_MODULE_DIR "/${CMAKE_INSTALL_LIBDIR}/cmake")
    string(REPLACE ";" "${AWS_MODULE_DIR};" AWS_MODULE_PATH "${CMAKE_PREFIX_PATH}${AWS_MODULE_DIR}")
    list(APPEND CMAKE_MODULE_PATH ${AWS_MODULE_PATH})

    # include() will "load and run" cmake script
    include(resolve_platform)
    include(CMakePackageConfigHelpers)

    if (REGENERATE_CLIENTS AND NOT ENABLE_VIRTUAL_OPERATIONS)
        if (PLATFORM_LINUX OR PLATFORM_APPLE)
            Message(STATUS "${BoldYellow}You are regenerating service client's source code and is turning ENABLE_VIRTUAL_OPERATIONS off. If you are targeting smaller binary size, read description string of ENABLE_VIRTUAL_OPERATIONS.${ColourReset}")
        endif ()
    endif ()

    # use response files to prevent command-line-too-big errors for large libraries like iam
    set(CMAKE_CXX_USE_RESPONSE_FILE_FOR_OBJECTS 1)
    set(CMAKE_CXX_USE_RESPONSE_FILE_FOR_INCLUDES 1)
    set(CMAKE_CXX_RESPONSE_FILE_LINK_FLAG "@")

    if (COMMAND apply_pre_project_platform_settings)
        apply_pre_project_platform_settings()
    endif ()

    include(initialize_project_version)

    if (BUILD_SHARED_LIBS OR FORCE_SHARED_CRT)
        set(STATIC_CRT OFF)
    else ()
        set(STATIC_CRT ON)
    endif ()
	
    if (${STATIC_CRT})
        set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
    else ()
        set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
    endif ()

    # Add Linker search paths to RPATH so as to fix the problem where some linkers can't find cross-compiled dependent libraries in customer paths when linking executables.
    set(CMAKE_INSTALL_RPATH_USE_LINK_PATH true)

    # build the sdk targets
    project("aws-cpp-sdk-all" VERSION "${PROJECT_VERSION}" LANGUAGES CXX)

    set(Python_ADDITIONAL_VERSIONS 3.7 3.8 3.9 3.10)
    find_package(PythonInterp)
    set(PYTHON3_CMD ${PYTHON_EXECUTABLE})

    # ENABLE_ZLIB_REQUEST_COMPRESSION should be ON by default if ZLIB is available
    if(ENABLE_ZLIB_REQUEST_COMPRESSION)
        find_package(ZLIB QUIET)
        if ( NOT ZLIB_FOUND)
            set(ENABLE_ZLIB_REQUEST_COMPRESSION
                    OFF CACHE BOOL
                    "For services that support it, request content will be compressed. On by default if dependency available"
                    FORCE)
            message(WARNING "ZLIB is not available, it will not be used to compress requests")
        else()
            #Passing the information that we want zlib request compression support to C++
            add_definitions("-DENABLED_ZLIB_REQUEST_COMPRESSION" "-DENABLED_REQUEST_COMPRESSION")
        endif()
    endif()

    if (UNIX AND NOT APPLE)
        include(GNUInstallDirs)
    elseif (NOT DEFINED CMAKE_INSTALL_LIBDIR)
        set(CMAKE_INSTALL_LIBDIR "lib")
    endif ()

    if (DEFINED CMAKE_PREFIX_PATH)
        file(TO_CMAKE_PATH "${CMAKE_PREFIX_PATH}" CMAKE_PREFIX_PATH)
    endif ()

    add_definitions("-DAWS_TEST_REGION=${AWS_TEST_REGION}")
    if (NOT AWS_USER_AGENT_CUSTOMIZATION STREQUAL "")
        message(STATUS "Adding user agent customization ${AWS_USER_AGENT_CUSTOMIZATION}")
        add_definitions("-DAWS_USER_AGENT_CUSTOMIZATION=${AWS_USER_AGENT_CUSTOMIZATION}")
    endif()
    if (DEFINED CMAKE_INSTALL_PREFIX)
        file(TO_CMAKE_PATH "${CMAKE_INSTALL_PREFIX}" CMAKE_INSTALL_PREFIX)
    endif ()

    # http client, encryption, zlib
    include(external_dependencies)
    include(build_external)

    if (COMMAND apply_post_project_platform_settings)
        apply_post_project_platform_settings()
    endif ()

    set(CMAKE_CONFIGURATION_TYPES
            Debug                   # Setup for easy debugging. No optimizations.
            DebugOpt                # An optimized version of Debug.
            Release                 # Fully optimized, no debugging information.
            RelWithDebInfo          # A debuggable version of Release.
            MinSizeRel              # Like Release, but optimized for memory rather than speed.
            )

    # build third-party targets
    if (BUILD_DEPS)
        set(CMAKE_INSTALL_RPATH "$ORIGIN")
        list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/crt/aws-crt-cpp/crt/aws-c-common/cmake")

        include(AwsFindPackage)

        set(IN_SOURCE_BUILD ON)
        set(BUILD_TESTING_PREV ${BUILD_TESTING})
        set(BUILD_TESTING OFF CACHE BOOL "Disable all tests in dependencies.")
        # TODO: Use same BUILD_SHARED_LIBS for Aws Common Runtime dependencies.
        # libcurl and aws-sdk-cpp-core may link to different libcrypto, which leads to some issues for shared build.
        if (ENABLE_OPENSSL_ENCRYPTION)
            set(BUILD_SHARED_LIBS_PREV ${BUILD_SHARED_LIBS})
            set(BUILD_SHARED_LIBS OFF)
        endif ()
        set(CRT_BUILD_SHARED_LIBS ${BUILD_SHARED_LIBS})
        add_subdirectory(crt/aws-crt-cpp)
        set(BUILD_TESTING ${BUILD_TESTING_PREV})
        if (ENABLE_OPENSSL_ENCRYPTION)
            set(BUILD_SHARED_LIBS ${BUILD_SHARED_LIBS_PREV})
        endif ()
    else ()
        include(AwsFindPackage)
        set(IN_SOURCE_BUILD OFF)
    endif ()
    set(AWS_COMMON_RUNTIME_LIBS "aws-crt-cpp;aws-c-auth;aws-c-cal;aws-c-common;aws-c-compression;aws-c-event-stream;aws-c-http;aws-c-io;aws-c-mqtt;aws-c-s3;aws-checksums;aws-c-sdkutils")

    include(compiler_settings)
    # Instead of calling functions/macros inside included cmake scripts, we should call them in our main CMakeList.txt
    set_msvc_flags()
    set_msvc_warnings()

    include(sdks)

    include(utilities)

    if (ENABLE_BCRYPT_ENCRYPTION)
        set(CRYPTO_LIBS Bcrypt)
        set(CRYPTO_LIBS_ABSTRACT_NAME Bcrypt)
    elseif (ENABLE_OPENSSL_ENCRYPTION)
        set(CRYPTO_LIBS ${OPENSSL_LIBRARIES} ${ZLIB_LIBRARIES})
        set(CRYPTO_LIBS_ABSTRACT_NAME crypto ssl z)
    endif ()

    if (ENABLE_CURL_CLIENT)
        set(CLIENT_LIBS ${CURL_LIBRARIES})
        set(CLIENT_LIBS_ABSTRACT_NAME curl)
    elseif (ENABLE_WINDOWS_CLIENT)
        if (USE_IXML_HTTP_REQUEST_2)
            set(CLIENT_LIBS msxml6 runtimeobject)
            set(CLIENT_LIBS_ABSTRACT_NAME msxml6 runtimeobject)
            if (BYPASS_DEFAULT_PROXY)
                list(APPEND CLIENT_LIBS winhttp)
                list(APPEND CLIENT_LIBS_ABSTRACT_NAME winhttp)
            endif ()
        else ()
            set(CLIENT_LIBS Wininet winhttp)
            set(CLIENT_LIBS_ABSTRACT_NAME Wininet winhttp)
        endif ()
    endif ()

    # setup user specified installation directory if any, regardless previous platform default settings
    if (CMAKE_INSTALL_BINDIR)
        set(BINARY_DIRECTORY "${CMAKE_INSTALL_BINDIR}")
    endif ()

    if (CMAKE_INSTALL_LIBDIR)
        set(LIBRARY_DIRECTORY "${CMAKE_INSTALL_LIBDIR}")
    endif ()

    if (CMAKE_INSTALL_INCLUDEDIR)
        set(INCLUDE_DIRECTORY "${CMAKE_INSTALL_INCLUDEDIR}")
    endif ()

    if (BUILD_SHARED_LIBS)
        set(ARCHIVE_DIRECTORY "${BINARY_DIRECTORY}")
    else ()
        set(ARCHIVE_DIRECTORY "${LIBRARY_DIRECTORY}")
    endif ()

    if (ENABLE_ADDRESS_SANITIZER)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address -g -fno-omit-frame-pointer")
        if (CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 7.1)
            message(STATUS "adding libasan as static explicitly for GCC 7+")
            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static-libasan")
        endif ()
    endif ()

    include(CheckCXXSymbolExists)

    check_cxx_symbol_exists("pathconf" "unistd.h" HAS_PATHCONF)
    if (HAS_PATHCONF)
        add_definitions(-DHAS_PATHCONF)
    endif ()

    check_cxx_symbol_exists("umask" "sys/stat.h" HAS_UMASK)
    if (HAS_UMASK)
        add_definitions(-DHAS_UMASK)
    endif ()

    if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
        add_definitions(-DLEGACY_GCC)
    endif ()

    add_definitions("-DAWS_TEST_REGION=${AWS_TEST_REGION}")

    add_sdks()

    # for user friendly cmake usage
    include(setup_cmake_find_module)

    # for generating make uninstall target
    if (NOT TARGET uninstall)
        ADD_CUSTOM_TARGET(uninstall "${CMAKE_COMMAND}" -P "${AWS_NATIVE_SDK_ROOT}/cmake/make_uninstall.cmake")
    else ()
        ADD_CUSTOM_TARGET(uninstall-awssdk "${CMAKE_COMMAND}" -P "${AWS_NATIVE_SDK_ROOT}/cmake/make_uninstall.cmake")
    endif ()
else () #  End of Legacy Build
    # -- Preamble --
    message(STATUS "Building with new CMake scripts.")
    string(CONCAT DESCRIPTION_STRING "The AWS SDK for C++ provides a modern C++ (standard version C++11 or later) "
            "interface for Amazon Web Services (AWS).")

    list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")

    find_package(Git QUIET) # Adding development helper tools as git_hash built when available.

    include(project_version)
    obtain_project_version(SDK_PROJECT_VERSION aws-cpp-sdk_GIT_HASH)

    project("aws-cpp-sdk"
            LANGUAGES CXX
            VERSION ${SDK_PROJECT_VERSION}
            DESCRIPTION ${DESCRIPTION_STRING}
            HOMEPAGE_URL "https://docs.aws.amazon.com/sdk-for-cpp"
            )
    include(CTest)

    # -- Project wide setup --
    # Setting C++ minimum requirements
    set(CMAKE_CXX_STANDARD 11)
    set(CMAKE_CXX_EXTENSIONS OFF)
    set(CMAKE_CXX_STANDARD_REQUIRED ON)

    # Setting flags for telling compiler this is a non-legacy build
    add_definitions(-DNON_LEGACY_BUILD)

    # Setting build to hide symbols in targets by default
    set(CMAKE_CXX_VISIBILITY_PRESET hidden)
    set(CMAKE_VISIBILITY_INLINES_HIDDEN YES)

    # Preventing writes to package registry by default
    set(CMAKE_EXPORT_NO_PACKAGE_REGISTRY YES)

    # Validating config type and setting default if needed
    get_property(is_multi_conf_build GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
    if (NOT is_multi_conf_build)
        set(allowed_build_types Debug Release RelWithDebInfo MinSizeRel)
        # cmake-gui helper
        set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "${allowed_build_types}")
        if (NOT CMAKE_BUILD_TYPE)
            message(STATUS "Setting build type to 'RelWithDebInfo' as none was specified.")
            set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING "Choose the type of build." FORCE)
        elseif (NOT CMAKE_BUILD_TYPE IN_LIST allowed_build_types)
            message(FATAL_ERROR "Unknown build type: ${CMAKE_BUILD_TYPE}")
        endif ()
    endif ()

    # Options definition
    option(BUILD_TESTING "If enabled, the SDK will include tests in the build" OFF)

    # Next to be included
    #    # -- Dependencies --
    #    include(dependencies)

    # Configuring the encryption tools used

    #    # -- main build targets --
    #    add_subdirectory(src)
    #    add_subdirectory(generated)

    # -- Tests and packaging if running this as top project --
    #    if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
    #        # Testing Dependencies
    #        if (BUILD_TESTING)
    #            add_subdirectory(tests)
    #        endif ()
    #        add_subdirectory(packaging)
    #    endif ()

    # Adding integration tests build and run
    # Adding end-points tests build and run
    # Add support for static analysis
    # Building client libraries.
    # Doc generation review
    # Add support support for old SDK build flags
    # Add previously available options.

    message(WARNING "This is work in progress build script. No SDK is built so far."
            "If you need to build the SDK, you need to use LEGACY_BUILD mode at this time. "
            )
endif ()