# CMP0005

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()`.

Preprocessor definition values are now escaped automatically.

This policy determines whether or not CMake should generate escaped preprocessor definition values added via add_definitions. CMake versions 2.4 and below assumed that only trivial values would be given for macros in add_definitions calls. It did not attempt to escape non-trivial values such as string literals in generated build rules. CMake versions 2.6 and above support escaping of most values, but cannot assume the user has not added escapes already in an attempt to work around limitations in earlier versions.

The `OLD` behavior for this policy is to place definition values given to add_definitions directly in the generated build rules without attempting to escape anything. The `NEW` behavior for this policy is to generate correct escapes for all native build tools automatically. See documentation of the `COMPILE_DEFINITIONS` target property for limitations of the escaping implementation.

This policy was introduced in CMake version 2.6.0. 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.