如何克隆外部（来自 git）cmake 项目并将其集成到本地项目中
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How to clone and integrate external (from git) cmake project into local one
提问by amigo421
I faced with a problem when I was trying to use Google Test.
我在尝试使用 Google Test 时遇到了一个问题。
There are lot of manuals on how to use ExternalProject_Addfor the adding gtest into the project, however most of these describe a method based on downloading zip archive with gtest and build it.
有很多关于如何使用ExternalProject_Add将 gtest 添加到项目中的手册，但是大多数手册描述了一种基于使用 gtest 下载 zip 存档并构建它的方法。
As we know gtest is github-hosted and cmake-based project. So I'd like to find native cmake way.
我们知道 gtest 是 github 托管和基于 cmake 的项目。所以我想找到原生的 cmake 方式。
If this would be a header-only project, I'd write something like:
如果这将是一个仅限标题的项目，我会写如下：
cmake_minimum_required(VERSION 2.8.8)
include(ExternalProject)
find_package(Git REQUIRED)
ExternalProject_Add(
gtest
PREFIX ${CMAKE_CURRENT_SOURCE_DIR}/ext
GIT_REPOSITORY https://github.com/google/googletest.git
TIMEOUT 10
UPDATE_COMMAND ${GIT_EXECUTABLE} pull
CONFIGURE_COMMAND ""
BUILD_COMMAND ""
INSTALL_COMMAND ""
LOG_DOWNLOAD ON
)
ExternalProject_Get_Property(gtest source_dir)
set(GTEST_INCLUDE_DIR ${source_dir}/googletest/include CACHE INTERNAL "Path to include folder for GTest")
set(GTEST_ROOT_DIR ${source_dir}/googletest CACHE INTERNAL "Path to source folder for GTest")
include_directories(${INCLUDE_DIRECTORIES} ${GTEST_INCLUDE_DIR} ${GTEST_ROOT_DIR})
message(${GTEST_INCLUDE_DIR})
and add this script from my cmake project like:
并从我的 cmake 项目中添加此脚本，例如：
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake.modules/")
include(AddGTest)
....
add_dependencies(${PROJECT_NAME} gtest)
However this requires a build step.
然而，这需要一个构建步骤。
How should this be implemented?
这应该如何实施？
- By adding
BUILD_COMMANDintoExternaProject_Addand linking with produced libs? - Or by including gtest's cmakelists into my project, something like this:
- 通过添加
BUILD_COMMAND到ExternaProject_Add，并与生产库链接？ - 或者通过将 gtest 的 cmakelists 包含到我的项目中，如下所示：
add_subdirectory (${CMAKE_SOURCE_DIR}\ext\src\gtest\googletest\CMakeLists.txt)
add_subdirectory (${CMAKE_SOURCE_DIR}\ext\src\gtest\googletest\CMakeLists.txt)
this is not correct way because on the moment of the project load the folder does not exist.
这不是正确的方法，因为在项目加载时文件夹不存在。
- Any other ways?
- 还有其他方法吗？
What is a correct/prefer way?
什么是正确/首选的方式？
回答by David Marquant
I would go with the first approach. You don't need to specify a build command because cmake is used by default. This could look like:
我会采用第一种方法。您不需要指定构建命令，因为默认使用 cmake。这可能看起来像：
cmake_minimum_required(VERSION 3.0)
project(GTestProject)
include(ExternalProject)
set(EXTERNAL_INSTALL_LOCATION ${CMAKE_BINARY_DIR}/external)
ExternalProject_Add(googletest
GIT_REPOSITORY https://github.com/google/googletest
CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${EXTERNAL_INSTALL_LOCATION}
)
include_directories(${EXTERNAL_INSTALL_LOCATION}/include)
link_directories(${EXTERNAL_INSTALL_LOCATION}/lib)
add_executable(FirstTest main.cpp)
add_dependencies(FirstTest googletest)
target_link_libraries(FirstTest gtest gtest_main pthread)
I don't know if this is the correct/preferred way if there even is one. If you wanted to implement your second approach you would have to download the code with execute_process first.
我不知道这是否是正确/首选的方式，如果有的话。如果您想实现第二种方法，则必须首先使用 execute_process 下载代码。
