# CMP0108

New in version 3.18.

A target is not allowed to link to itself even through an `ALIAS` target.

In CMake 3.17 and below, a target can link to a target aliased to itself.

The `OLD` behavior for this policy is to allow a target to link to a target aliased to itself.

The `NEW` behavior of this policy is to prevent a target to link to itself through an `ALIAS` target.

This policy was introduced in CMake version 3.17. Use the `cmake_policy()` command to set it to `OLD` or `NEW` explicitly. Unlike many policies, CMake version 3.26.0-rc5 does not warn when this policy is not set and simply uses `OLD` behavior.

Note

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