CMP0045 — CMake 4.0.1 Documentation

# CMP0045

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()`.

Error on non-existent target in get_target_property.

In CMake 2.8.12 and lower, the `get_target_property()` command accepted a non-existent target argument without issuing any error or warning. The result variable is set to a `-NOTFOUND` value.

The `OLD` behavior for this policy is to issue no warning and set the result variable to a `-NOTFOUND` value. The `NEW` behavior for this policy is to issue a `FATAL_ERROR` if the command is called with a non-existent target.

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.