# CMP0024

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. CMake version 3.19.0-rc3 warns when the policy is not set and uses `OLD` behavior. Use the `cmake_policy()` command to set it to `OLD` or `NEW` explicitly.

Note

The `OLD` behavior of a policy is `deprecated by definition` and may be removed in a future version of CMake.