CMake - 始终构建特定文件

Question

我有一个特定的文件，无论它是否被修改，都应该在每次编译时重建。原因是它依赖于值发生变化的系统宏。我怎么能用CMake强制重建？我不想将它绑定(bind)到特定目标:在 CMakeLists.txt 中指定的任何目标开始实际构建过程之前，应该“接触”该文件。

Answer 1

CMake 有一个 add_custom_target命令:

Adds a target with the given name that executes the given commands. The target has no output file and is always considered out of date even if the commands try to create a file with the name of the target. [...] By default nothing depends on the custom target. Use the add_dependencies() command to add dependencies to or from other targets.