gtest and cmake

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#stub

• If you have a code, do you have a test of the code ?
• This page describes how to add gtest using cmake at "build time". You don't need to "install" gtest
• あなたの手元のコードにテストは書かれていますか？
• このページではcmakeを使って、ビルド時にgtestを追加する方法を説明します。gtestのインストールは不要です

External Project †

• in cmake, you may build some project/program/library using external project function from cmake
• Also, you may download some library using cmake
• Combining this, it will allow you to "download and build and link with your program" at "build time"

example of CMakeLists.txt †

cmake_minimum_required(VERSION 2.8)
project(softwareFp16)
set_property(GLOBAL PROPERTY USE_FOLDERS ON)

# detect the platform
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(arm.*|ARM.*)")
    set(ARM 1)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64)")
    set(AARCH64 1)
else ()
    set(X86 1)
endif()

if (X86)
    message(STATUS "detected x86 or x86_64 architecture")
    if (MSVC)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /arch:AVX /wd4819 -D_VARIADIC_MAX=10 /MP")
    endif()
    set(INTRINSIC_SOURCES converter_x86.cpp)
elseif (AARCH64)
    message(STATUS "detected ARM 64bit architecture")
    set(INTRINSIC_SOURCES converter_arm.cpp)
elseif (ARM)
    message(STATUS "detected ARM architecture")
    if (UNIX)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfp16-format=ieee")
    endif()
    set(INTRINSIC_SOURCES converter_arm.cpp)
endif()
set(HALF_CONVERTER_FILES ${INTRINSIC_SOURCES} converter.cpp converter.hpp)

# gtest
set(PACKAGE_ARCHIVE_DIR "${CMAKE_SOURCE_DIR}/packages")
set(THIRDPARTY_INSTALL "${CMAKE_BINARY_DIR}/third-party")
include(ExternalProject)

macro(check_and_download PROJECT_NAME FULL_URL MD5_HASH_VALUE)
    message(STATUS "Downloading ${PROJECT_NAME}")
    get_filename_component(EXTRACT_ARCHIVE_FILE ${FULL_URL} NAME)
    set(${PROJECT_NAME}_FULL_URL "${FULL_URL}")
    set(${PROJECT_NAME}_WORK_DIR "${PACKAGE_ARCHIVE_DIR}")
    set(${PROJECT_NAME}_ARCHIVE_FILE "${PACKAGE_ARCHIVE_DIR}/${EXTRACT_ARCHIVE_FILE}")
    set(${PROJECT_NAME}_UNPACK_DIR "${CMAKE_BINARY_DIR}/third-party/${PROJECT_NAME}-src")
    if(NOT EXISTS ${${PROJECT_NAME}_ARCHIVE_FILE})
    file(
        DOWNLOAD ${FULL_URL} ${${PROJECT_NAME}_ARCHIVE_FILE}
        EXPECTED_MD5 ${MD5_HASH_VALUE} 
    )
    file(MD5 "${${PROJECT_NAME}_ARCHIVE_FILE}" ${PROJECT_NAME}_DOWNLOADED_MD5)
    if(NOT ${${PROJECT_NAME}_DOWNLOADED_MD5} STREQUAL ${MD5_HASH_VALUE})
        message(
            FATAL_ERROR
            "${PROJECT_NAME} MD5 hash match error : ${${PROJECT_NAME}_DOWNLOADED_MD5} (expected: ${MD5_HASH_VALUE})"
        )
    endif(NOT ${${PROJECT_NAME}_DOWNLOADED_MD5} STREQUAL ${MD5_HASH_VALUE})
    endif()
    set(${PROJECT_NAME}_DOWNLOADED_FILE "${${PROJECT_NAME}_ARCHIVE_FILE}")
endmacro(check_and_download)

macro(check_and_add_as_external_project PROJECT_NAME FULL_URL MD5_HASH_VALUE)
    check_and_download(${PROJECT_NAME} ${FULL_URL} ${MD5_HASH_VALUE})
    ExternalProject_Add(${PROJECT_NAME}_ext
    URL         "${${PROJECT_NAME}_ARCHIVE_FILE}"
    URL_HASH    MD5=${MD5_HASH_VALUE}
    BINARY_DIR  "${THIRDPARTY_INSTALL}/${PROJECT_NAME}" 
    SOURCE_DIR  "${THIRDPARTY_INSTALL}/${PROJECT_NAME}-src" 
    CMAKE_ARGS  "${gtest_cmake_args}" 
    "-DCMAKE_INSTALL_PREFIX=${THIRDPARTY_INSTALL}" 
    ${ARGN}
    )
    SET_TARGET_PROPERTIES(${PROJECT_NAME}_ext PROPERTIES FOLDER "3rdparty")
endmacro(check_and_add_as_external_project)

# gtest
check_and_add_as_external_project(gtest
    "https://github.com/google/googletest/archive/release-1.8.0.zip"
    "adfafc8512ab65fd3cf7955ef0100ff5"
    "-DBUILD_GMOCK=OFF"
    "-DBUILD_GTEST=ON"
    "-DCMAKE_DEBUG_POSTFIX=d"
    )
set(GTEST_INCLUDE_DIR     "${THIRDPARTY_INSTALL}/include")
set(GTEST_LIB_PATH        "${THIRDPARTY_INSTALL}/lib")
set(GTEST_LIBRARY_RELEASE "${GTEST_LIB_PATH}/gtest.lib")
set(GTEST_MAIN_RELEASE    "${GTEST_LIB_PATH}/gtest_main.lib")
set(GTEST_LIBRARY_DEBUG   "${GTEST_LIB_PATH}/gtestd.lib")
set(GTEST_MAIN_DEBUG      "${GTEST_LIB_PATH}/gtest_maind.lib")
include_directories(${GTEST_INCLUDE_DIR})
find_package(Threads)

• let's explain one by one

  include(ExternalProject)

  • what ever you do, you'll need to include ExternalProject
  • now you may use ExternalProject_add command