# CMP0024

Warning

The `OLD` behavior of this policy was removed in CMake version 4.0. This policy must be set to `NEW` by a call to `cmake_minimum_required()` or `cmake_policy()`.

Disallow include export result.

CMake 2.8.12 and lower allowed use of the `include()` command with the result of the `export()` command. This relies on the assumption that the `export()` command has an immediate effect at configure-time during a cmake run. Certain properties of targets are not fully determined until later at generate-time, such as the link language and complete list of link libraries. Future refactoring will change the effect of the `export()` command to be executed at generate-time. Use `ALIAS` targets instead in cases where the goal is to refer to targets by another name.

The `OLD` behavior for this policy is to allow including the result of an `export()` command. The `NEW` behavior for this policy is not to allow including the result of an `export()` command.

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.