CMP0124

New in version 3.21.

When this policy is set to NEW, the scope of loop variables defined by the foreach() command is restricted to the loop only. They will be unset at the end of the loop.

The OLD behavior for this policy still clears the loop variables at the end of the loop, but does not unset them. This leaves them as defined, but empty.

This policy was introduced in CMake version 3.21. Use the cmake_policy() command to set it to OLD or NEW explicitly. Unlike many policies, CMake version 3.25.3 does not warn when the 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.