不熟悉 CMake ，但是常见问题中的一种方法 如何使用其他编译器？ 可能有帮助。我猜猜预制的Windows二进制文件不知道你使用什么编译器，所以它必须依赖 CC 和 CXX 环境变量。

I'm unfamiliar with CMake, but one of the methods in the FAQ How do I use a different compiler? may help. I'm guessing that the pre-built Windows binary can't know what compiler you're using, so it has to rely on the CC and CXX environment variables.