检查包含/库路径变量（如OpenCV_LIBS）在UNIX中指向何处 [英] Check where include/library path variables like OpenCV_LIBS point to in unix

问题描述

在将OpenCV之类的库与C / C ++一起使用时，将使用OpenCV_LIBS之类的变量将编译器/链接器指向相关目录。

When using some libraries like OpenCV with C/C++, variables like OpenCV_LIBS are used to point the compiler/linker to the relevant directories.

使用 cmake ：

include_directories( ${OpenCV_INCLUDE_DIRS} )
target_link_libraries( project_name ${OpenCV_LIBS} )

如何检查这些变量指向的位置？我尝试在终端中键入 set 或 printenv ，但是它只显示一些系统变量。还有如何设置/更改此类变量？

How can I check where such variables point at? I've tried typing set or printenv in terminal but it shows only some system variables. Also how can I set/change such variables?

推荐答案

这些变量由 cmake （请参见 OpenCVConfig.cmake 详细了解 opencv CMake变量可用）。

Those variables are determined by cmake (see OpenCVConfig.cmake for a more detailed description of opencv CMake variables available).

要查看这些值，可以在 find_package（OpenCV）之后添加 message（）调用）调用项目的 CMakeLists.txt ：

To see those values you can add message() calls after the find_package(OpenCV) call to your project's CMakeLists.txt:

find_package(OpenCV)

message(STATUS "OpenCV_INCLUDE_DIRS = ${OpenCV_INCLUDE_DIRS}")
message(STATUS "OpenCV_LIBS = ${OpenCV_LIBS}")

---

或者您可以运行 find_package 通过CMake命令行选项。

---

Alternatively you can run find_package via a CMake command line option.

以下是一些示例（如果CMake无法找到您的库安装路径，则 CMAKE_PREFIX_PATH 部分是可选的自动）：

Here are a few examples (the CMAKE_PREFIX_PATH part is optional if CMake is not able to find your libraries installation path automatically):

1. MODE = COMPILE 给出包含目录（例如 MSVC 编译器）

1. MODE=COMPILE giving include directories (e.g. with MSVC compiler)

$ cmake 
    --find-package 
    -DNAME=OpenCV 
    -DCOMPILER_ID=MSVC -DMSVC_VERSION=1700 
    -DLANGUAGE=CXX 
    -DMODE=COMPILE 
    -DCMAKE_PREFIX_PATH:PATH=/path/to/your/OpenCV/build

MODE = LINK 提供链接库（例如，使用 GNU 编译器）

MODE=LINK giving link libraries (e.g. with GNU compiler)

$ cmake 
    --find-package 
    -DNAME=OpenCV 
    -DCOMPILER_ID=GNU 
    -DLANGUAGE=CXX 
    -DMODE=LINK 
    -DCMAKE_PREFIX_PATH:PATH=/path/to/your/OpenCV/build

注意：此CMake调用将创建 CMakeFiles 当前工作目录中的子目录。

Note: This CMake call will create a CMakeFiles sub-directory in your current working directory.

参考文献

• 将OpenCV与gcc和CMake


• CMakeFindPackageMode CMake模块文档

• Using OpenCV with gcc and CMake
• CMakeFindPackageMode CMake module documentation

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