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+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 cmake_policy command to set it to OLD or
+NEW explicitly.
+
+.. include:: DEPRECATED.txt