# CMP0005

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. CMake version 3.19.0-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.