C++ 通过 cmake 链接作为外部项目包含的 opencv 库
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linking opencv libraries included as an external project via cmake
提问by Vyacheslav
I'm relatively new to cmake and after days of struggling couldn't figure out the following thing:
我对 cmake 比较陌生，经过几天的努力，我无法弄清楚以下事情：
I have a project that depends on opencv (which is a cmake project on its own) and I want to statically link opencv libraries. What I'm doing is I have a copy of opencv source code in my project and include it into my CMakeLists.txt via
我有一个依赖于 opencv 的项目（它本身就是一个 cmake 项目），我想静态链接 opencv 库。我正在做的是我的项目中有一份 opencv 源代码的副本，并通过以下方式将其包含到我的 CMakeLists.txt 中
ExternalProject_Add(my_copy_of_opencv_project
CMAKE_ARGS -D BUILD_SHARED_LIBS=NO ...
CMAKE_INSTALL_PREFIX=${MY_OPENCV_INSTALL_DIR}
SOURCE_DIR ${PATH_TO_OPENCV_SRCS}
)
All built nicely and where I have problem is that I cannot reliably determine where the opencv libraries will be. E.g. on linux/mac there are in ${MY_OPENCV_INSTALL_DIR}/liband are named as libopencv_core.awhereas on 32-bit Windows with VS 2012 installed the libs are in ${MY_OPENCV_INSTALL_DIR}/lib/x86/vc11/staticliband for the Debug configuration the libs named like opencv_core247d.lib.
一切都很好，我遇到的问题是我无法可靠地确定 opencv 库的位置。例如，在 linux/mac 上有 in${MY_OPENCV_INSTALL_DIR}/lib并命名为 aslibopencv_core.a而在安装了 VS 2012 的 32 位 Windows 上，libs 位于${MY_OPENCV_INSTALL_DIR}/lib/x86/vc11/staticlibDebug 配置中，libs 命名为opencv_core247d.lib.
So the question is can I somehow obtain a list of all libraries produced by the OpenCV build (and the root lib folder) and link them via something like target_link_libraries(mylib opencv_core ...)?
所以问题是我能否以某种方式获得 OpenCV 构建（和根 lib 文件夹）生成的所有库的列表，并通过类似的方式链接它们target_link_libraries(mylib opencv_core ...)？
Maybe I'm doing something wrong or overcomplicated. So what I basically want is to compile my embedded opencv source tree statically and link against its libraries in a "cross-plaformish" way.
也许我做错了什么或过于复杂。所以我基本上想要的是静态编译我的嵌入式 opencv 源代码树，并以“跨平台”的方式链接到它的库。
Any pointers are highly appreciated! Thanks!
任何指针都非常感谢！谢谢！
回答by maxint
The best solution to use cmake with OpenCV project is:
在 OpenCV 项目中使用 cmake 的最佳解决方案是：
- Compile OpenCV as shared / static libraries with OpenCV's cmake build system.
- In your project's CMakeLists.txt
- 使用 OpenCV 的 cmake 构建系统将 OpenCV 编译为共享/静态库。
- 在您项目的 CMakeLists.txt 中
For example (CMakeLists.txt):
例如（CMakeLists.txt）：
cmake_minimum_required(VERSION 2.8.12)
project(test_project)
# OpenCV_DIR could also be read from system environment variable.
if(WIN32)
set(OpenCV_DIR "d:/libs/opencv-2.4.8/build")
else()
set(OpenCV_DIR "/usr/lib/opencv")
endif()
find_package(OpenCV REQUIRED COMPONENTS core imgproc highgui)
include_directories(${OpenCV_INCLUDE_DIRS}) # not needed for opencv>=4.0
add_executable(test main.cpp)
target_link_libraries(test ${OpenCV_LIBS})
It works in cross-platforms.
它适用于跨平台。
