CMP0055 — CMake 4.0.0 Documentation

# CMP0055

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()`.

Added in version 3.2.

Strict checking for the `break()` command.

CMake 3.1 and lower allowed calls to the `break()` command outside of a loop context and also ignored any given arguments. This was undefined behavior.

The `OLD` behavior for this policy is to allow `break()` to be placed outside of loop contexts and ignores any arguments. The `NEW` behavior for this policy is to issue an error if a misplaced break or any arguments are found.

This policy was introduced in CMake version 3.2. 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.