# CMAKE_POLICY_WARNING_CMP<NNNN>

Explicitly enable or disable the warning when CMake Policy `CMP<NNNN>` has not been set explicitly by `cmake_policy()` or implicitly by `cmake_minimum_required()`. This is meaningful only for the policies that do not warn by default:

- `CMAKE_POLICY_WARNING_CMP0025` controlled the warning for policy `CMP0025` in CMake versions before 4.0.

- `CMAKE_POLICY_WARNING_CMP0047` controlled the warning for policy `CMP0047` in CMake versions before 4.0.

- `CMAKE_POLICY_WARNING_CMP0056` controlled the warning for policy `CMP0056` in CMake versions before 4.0.

- `CMAKE_POLICY_WARNING_CMP0060` controlled the warning for policy `CMP0060` in CMake versions before 4.0.

- `CMAKE_POLICY_WARNING_CMP0065` controlled the warning for policy `CMP0065` in CMake versions before 4.0.

- `CMAKE_POLICY_WARNING_CMP0066` controls the warning for policy `CMP0066`.

- `CMAKE_POLICY_WARNING_CMP0067` controls the warning for policy `CMP0067`.

- `CMAKE_POLICY_WARNING_CMP0082` controls the warning for policy `CMP0082`.

- `CMAKE_POLICY_WARNING_CMP0089` controls the warning for policy `CMP0089`.

- `CMAKE_POLICY_WARNING_CMP0102` controls the warning for policy `CMP0102`.

- `CMAKE_POLICY_WARNING_CMP0112` controls the warning for policy `CMP0112`.

- `CMAKE_POLICY_WARNING_CMP0116` controls the warning for policy `CMP0116`.

- `CMAKE_POLICY_WARNING_CMP0126` controls the warning for policy `CMP0126`.

- `CMAKE_POLICY_WARNING_CMP0128` controls the warning for policy `CMP0128`.

- `CMAKE_POLICY_WARNING_CMP0129` controls the warning for policy `CMP0129`.

- `CMAKE_POLICY_WARNING_CMP0133` controls the warning for policy `CMP0133`.

- `CMAKE_POLICY_WARNING_CMP0172` controls the warning for policy `CMP0172`.

This variable should not be set by a project in CMake code. Project developers running CMake may set this variable in their cache to enable the warning (e.g. `-DCMAKE_POLICY_WARNING_CMP<NNNN>=ON`). Alternatively, running `cmake(1)` with the `--debug-output`, `--trace`, or `--trace-expand` option will also enable the warning.