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.
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