CMAKE_WARN_DEPRECATED

Whether to issue warnings for deprecated functionality.

This is a deprecated mechanism for interacting with the CMD_DEPRECATED diagnostic. If policy CMP0218 is set to NEW, this variable is ignored.

If policy CMP0218 is not set to NEW, the message() command's DEPRECATION message type will use CMAKE_WARN_DEPRECATED and CMAKE_ERROR_DEPRECATED to determine the severity of a deprecation diagnostic. The severity will be:

• IGNORE, if CMAKE_WARN_DEPRECATED is OFF and CMAKE_ERROR_DEPRECATED is unset or OFF.
• WARN, if CMAKE_WARN_DEPRECATED is unset or ON and CMAKE_ERROR_DEPRECATED is unset or OFF.
• FATAL_ERROR if CMAKE_ERROR_DEPRECATED is ON.

Setting CMAKE_WARN_DEPRECATED in the cache will alter the default state of the CMD_DEPRECATED diagnostic; however, the -W[no-][error=]deprecated option, and warnings.deprecated and/or errors.deprecated preset fields, will take precedence. CMake will also update the cached value of CMAKE_WARN_DEPRECATED to reflect the actual state of the diagnostic as of the start of script execution.