CMP0051ΒΆ
New in version 3.1.
List TARGET_OBJECTS in SOURCES target property.
CMake 3.0 and lower did not include the TARGET_OBJECTS
generator expression when
returning the SOURCES target property.
Configure-time CMake code is not able to handle generator expressions. If
using the 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 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 3.26.6 warns when the policy is not set and uses
OLD behavior. Use the cmake_policy() command to set it
to OLD or NEW explicitly.
Note
The OLD behavior of a policy is
deprecated by definition
and may be removed in a future version of CMake.