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+CMP0049
+-------
+
+Do not expand variables in target source entries.
+
+CMake 2.8.12 and lower performed and extra layer of variable expansion
+when evaluating source file names:
+
+.. code-block:: cmake
+
+ set(a_source foo.c)
+ add_executable(foo \${a_source})
+
+This was undocumented behavior.
+
+The OLD behavior for this policy is to expand such variables when processing
+the target sources. The NEW behavior for this policy is to issue an error
+if such variables need to be expanded.
+
+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.