CMP0040

警告

該方針的 OLD 行為已在 CMake 版本 4.0 中移除。該方針必須透過呼叫 cmake_minimum_required() 或 cmake_policy() 設定為 NEW。

The target in the TARGET signature of add_custom_command() must exist and must be defined in the current directory.

CMake 2.8.12 and lower silently ignored a custom command created with the TARGET signature of add_custom_command() if the target is unknown or was defined outside the current directory.

The OLD behavior for this policy is to ignore custom commands for unknown targets. The NEW behavior for this policy is to report an error if the target referenced in add_custom_command() is unknown or was defined outside the current directory.

This policy was introduced in CMake version 3.0. Prior to removal in CMake version 4.0, it could be set by cmake_policy() or cmake_minimum_required(). If it was not set, CMake warned, and used OLD behavior.