# CMP0085

`$<IN_LIST:...>` handles empty list items.

In CMake 3.13 and lower, the `$<IN_LIST:...>` generator expression always returned `0` if the first argument was empty, even if the list contained an empty item. This behavior is inconsistent with the `IN_LIST` behavior of `if()`, which this generator expression is meant to emulate. CMake 3.14 and later handles this case correctly.

The `OLD` behavior of this policy is for `$<IN_LIST:...>` to always return `0` if the first argument is empty. The `NEW` behavior is to return `1` if the first argument is empty and the list contains an empty item.

This policy was introduced in CMake version 3.14. CMake version 3.14.0-rc1 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.