c++ - cmake:在主 cmakelists 中使用之前从 git 检索库

Question

我通过附加的 cmakelists.txt 从 github 获取 Catch 库，该库包含在主库中:

cmake_minimum_required(VERSION 3.2)
project(MyProject)

add_subdirectory(ext/catch)
include_directories(${CATCH_INCLUDE_DIR} ${CXXOPTS_INCLUDE_DIR} src)
...

Catch 的 CmakeLists.txt 位置:

cmake_minimum_required(VERSION 2.8.8)
project(catch_builder CXX)
include(ExternalProject)
find_package(Git REQUIRED)

ExternalProject_Add(
    catch
    PREFIX ${CMAKE_CURRENT_SOURCE_DIR}
    GIT_REPOSITORY https://github.com/philsquared/Catch.git
    TIMEOUT 10
    UPDATE_COMMAND ${GIT_EXECUTABLE} pull
    CONFIGURE_COMMAND ""
    BUILD_COMMAND ""
    INSTALL_COMMAND ""
    LOG_DOWNLOAD ON
)

# Expose required variable (CATCH_INCLUDE_DIR) to parent scope
ExternalProject_Get_Property(catch source_dir)
set(CATCH_INCLUDE_DIR ${source_dir}/include CACHE INTERNAL "Path to include folder for Catch")
message(${CATCH_INCLUDE_DIR})

但是，主项目的构建早于从 Git 检索 Catch 的时间。 如何解决这个问题？我的 cmake 脚本出了什么问题？

Answer 1

我想我也遇到了同样的问题，我所做的是:

• 将AddCatch.cmake(cmake的cmakelist)放入CMAKE_MODULE_PATH
  例如:set(CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake")
• 删除行:project(catch_builder CXX)
• 将 add_subdirectory(ext/catch) 替换为 include(AddCatch)

它应该工作得很好；)