CMP0050 ------- Disallow add_custom_command SOURCE signatures. CMake 2.8.12 and lower allowed a signature for :command:`add_custom_command` which specified an input to a command. This was undocumented behavior. Modern use of CMake associates custom commands with their output, rather than their input. The ``OLD`` behavior for this policy is to allow the use of :command:`add_custom_command` SOURCE signatures. The ``NEW`` behavior for this policy is to issue an error if such a signature is used. This policy was introduced in CMake version 3.0. CMake version |release| warns when the policy is not set and uses ``OLD`` behavior. Use the :command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly. .. include:: DEPRECATED.txt