通过cmake定义预处理器宏 [英] Define preprocessor macro through cmake

问题描述

问题很简单，我希望答案也。如何通过cmake定义预处理器变量？

The Question is simple and I hope the answer also. How do I define a preprocessor variable through cmake?

等效代码为 #define foo 。

任何帮助将非常感激。

推荐答案

CMake有 add_definitions 命令。示例：

CMake has the add_definitions command for this purpose. An example:

    add_definitions(-DOPENCV_VERSION=${OpenCV_VERSION})
    add_definitions(-DWITH_OPENCV2)

虽然它看起来非常适合编译器，但它的工作是跨平台的，因为我们都知道并喜欢CMake。

Although it looks very compiler-specific, it works cross-platform due to some trickery we all know and love from CMake. CMake is such a shabby system.

有关命令的更多说明： https://cmake.org/cmake/help/latest/command/add_definitions.html

More explanation on the command here: https://cmake.org/cmake/help/latest/command/add_definitions.html

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