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# CMP0050

Disallow add_custom_command SOURCE signatures.

CMake 2.8.12 and lower allowed a signature for `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 `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 3.1.3 warns when the policy is not set and uses OLD behavior. Use the cmake_policy command to set it to OLD or NEW explicitly.

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