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List TARGET_OBJECTS in SOURCES target property.

CMake 3.0 and lower did not include the TARGET_OBJECTS generator expression <cmake-generator-expressions(7)> when returning the :prop_tgt:SOURCES target property.

Configure-time CMake code is not able to handle generator expressions. If using the :prop_tgt:SOURCES target property at configure time, it may be necessary to first remove generator expressions using the string(GENEX_STRIP) command. Generate-time CMake code such as file(GENERATE) can handle the content without stripping.

The OLD behavior for this policy is to omit TARGET_OBJECTS expressions from the :prop_tgt:SOURCES target property. The NEW behavior for this policy is to include TARGET_OBJECTS expressions in the output.

This policy was introduced in CMake version 3.1. 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.