如何在CMake中作为外部项目下载、编译和链接库？
如何在CMake中作为外部项目下载、编译和链接库？
提问于 2020-11-25 06:31:25
我正在尝试使用ExternalProject_Add框架在CMake中自动下载、编译和链接一个静态库。您可以找到库这里，但是这个问题可以应用于任何外部CMake项目。
以下是我问题的边界条件：
- 外部项目是与CMake兼容的
- 外部项目提供要链接到主项目目标的静态或动态库。
- 将使用ExternalProject_Add框架
- UNIX (Linux和MacOS)的可移植性就足够了。
- 现代CMake是可用的(CMake 3.14+)
我能够通过硬编码来让它工作，但是我非常肯定我的解决方案不是优雅的，也不是可移植的。
这是我的项目结构
root
|---> CMakeList.txt
|
|---> external ---> CMakeList.txt
| |--> CMakeList.txt.inih.in
|
|---> src ---> CMakeList.txtroot/CMakeList.txt
add_subdirectory(external)
set(INIH_LIB_DIR ${CMAKE_CURRENT_BINARY_DIR}/external/inih-install/lib)
set(INIH_INC_DIR ${CMAKE_CURRENT_BINARY_DIR}/external/inih-install/include/inih)
set(INIH_LIBRARIES inih inihcpp)
message(STATUS "inih includes directory : ${INIH_LIB_DIR}")
message(STATUS "inih libraries directory : ${INIH_INC_DIR}")
add_subdirectory(src)root/external/CMakeList.txt
configure_file(${PROJECT_SOURCE_DIR}/external/CMakeLists.txt.inih.in inih-download/CMakeLists.txt)
execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
RESULT_VARIABLE result
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/inih-download)
if (result)
message(FATAL_ERROR "CMake step for inih failed: ${result}")
endif ()
execute_process(COMMAND ${CMAKE_COMMAND} --build .
RESULT_VARIABLE result
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/inih-download)
if (result)
message(FATAL_ERROR "Build step for inih failed: ${result}")
endif ()root/external/CMakeList.txt.inih.in
include(ExternalProject)
ExternalProject_Add(inih
GIT_REPOSITORY https://github.com/OSSystems/inih.git
GIT_TAG master
SOURCE_DIR "${CMAKE_CURRENT_BINARY_DIR}/inih-src"
BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/inih-build"
INSTALL_DIR "${CMAKE_CURRENT_BINARY_DIR}/inih-install"
CONFIGURE_COMMAND cmake -DCMAKE_INSTALL_PREFIX=${CMAKE_CURRENT_BINARY_DIR}/inih-install ${CMAKE_CURRENT_BINARY_DIR}/inih-src
BUILD_COMMAND ${MAKE}
INSTALL_COMMAND make install
TEST_COMMAND ""
)root/src/CMakeList.txt
add_executable(test test.cpp)
target_include_directories(test PRIVATE ${INIH_INC_DIR})
target_link_directories(test PRIVATE ${INIH_LIB_DIR})
target_link_libraries(WagasciRecon ${INIH_LIBRARIES})我的问题是：是否有一种更优雅、更便携的方法来实现这一点？
回答 1
Stack Overflow用户
回答已采纳
发布于 2020-11-29 07:53:49
感谢Tsyvarev的评论，我能够用一个更干净、更健壮的代码来实现同样的目标：
root/CMakeList.txt
set(INIH_PROJECT inih_project)
set(INIH_INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/external/inih-install)
set(INIH_LIB_DIR ${INIH_INSTALL_DIR}/lib)
set(INIH_INC_DIR ${INIH_INSTALL_DIR}/include/inih)
add_library (inih STATIC IMPORTED)
set_target_properties (inih PROPERTIES IMPORTED_LOCATION ${INIH_LIB_DIR}/libinih.a)
target_include_directories(inih INTERFACE ${INIH_INC_DIR})
add_library (inihcpp STATIC IMPORTED)
set_target_properties(inihcpp PROPERTIES IMPORTED_LOCATION ${INIH_LIB_DIR}/libinihcpp.a)
target_include_directories(inihcpp INTERFACE ${INIH_INC_DIR})
set(INIH_LIBRARIES inih inihcpp)
message(STATUS "inih includes directory : ${INIH_INC_DIR}")
message(STATUS "inih libraries directory : ${INIH_LIB_DIR}")
...
add_subdirectory(external)
add_subdirectory(src)root/external/CMakeList.txt
include(CMakeLists.txt.inih.in)root/external/CMakeList.txt.inih.in
include(ExternalProject)
ExternalProject_Add(${INIH_PROJECT}
GIT_REPOSITORY https://github.com/OSSystems/inih.git
GIT_TAG master
PREFIX "${CMAKE_CURRENT_BINARY_DIR}/inih-prefix"
INSTALL_DIR "${INIH_INSTALL_DIR}"
CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
BUILD_COMMAND ${MAKE}
INSTALL_COMMAND make install
TEST_COMMAND ""
)root/src/CMakeList.txt
add_executable(test test.cpp)
target_link_libraries(test ${INIH_LIBRARIES})更新
如果将上面的解决方案应用到一个新的构建目录中，就会遇到像Imported target "inih" includes non-existent path这样的错误，这个错误可以像这里那样处理。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/64999518
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