在cmake工程中引入 gtest

第一步在工程文件中加入一个新的文件 CMakeLists.txt.in

cmake_minimum_required(VERSION 2.8.2)

project(googletest-download NONE)

include(ExternalProject)

ExternalProject_Add(googletest
        GIT_REPOSITORY    https://github.com/google/googletest.git
        GIT_TAG           master
        SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/googletest-src"
        BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/googletest-build"
        CONFIGURE_COMMAND ""
        BUILD_COMMAND     ""
        INSTALL_COMMAND   ""
        TEST_COMMAND      ""
        )

第二步骤在 CMakeLists.txt 增加下面的内容：

make_minimum_required(VERSION 3.14)

project(example)

set(CMAKE_CXX_STANDARD 11)

message("cmake_cmonnad ${CMAKE_COMMAND}")
message("cmake_genrator ${CMAKE_GENERATOR}")
###########
# gtest
###########
configure_file(CMakeLists.txt.in googletest-download/CMakeLists.txt)
## 执行cmake 过程 生成 MakeFile
execute_process(COMMAND ${CMAKE_COMMAND}  -G "${CMAKE_GENERATOR}" .
        RESULT_VARIABLE result
        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download
        )
if(result)
    message(FATAL_ERROR "CMake step for googletest failed: ${result}")
endif()
# 执行make的 build过程
execute_process(COMMAND ${CMAKE_COMMAND} --build .
        RESULT_VARIABLE result
        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download
        )
if(result)
    message(FATAL_ERROR "Build step for googletest failed: ${result}")
endif()
# Prevent overriding the parent project's compiler/linker
# settings on Windows
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
# Add googletest directly to our build. This defines
# the gtest and gtest_main targets.
add_subdirectory(${CMAKE_CURRENT_BINARY_DIR}/googletest-src
        ${CMAKE_CURRENT_BINARY_DIR}/googletest-build
        EXCLUDE_FROM_ALL)

# The gtest/gtest_main targets carry header search path
# dependencies automatically when using CMake 2.8.11 or
# later. Otherwise we have to add them here ourselves.
if (CMAKE_VERSION VERSION_LESS 2.8.11)
    include_directories("${gtest_SOURCE_DIR}/include")
endif()

enable_testing()

# Now simply link against gtest or gtest_main as needed. Eg
add_executable(example example.cpp)
target_link_libraries(example gtest_main)
add_test(NAME example_test COMMAND example)

参考gtest 官方文档