NO_SYSTEM_FROM_IMPORTED

Do not treat include directories from the interfaces of consumed :ref:imported targets as system directories.

When the consumed target's :prop_tgt:SYSTEM property is set to true, the contents of the :prop_tgt:INTERFACE_INCLUDE_DIRECTORIES target property are treated as system includes or, on Apple platforms, when the target is a framework, it will be treated as system. By default, :prop_tgt:SYSTEM is true for imported targets and false for other target types. If the NO_SYSTEM_FROM_IMPORTED property is set to true on a consuming target, compilation of sources in that consuming target will not treat the contents of the :prop_tgt:INTERFACE_INCLUDE_DIRECTORIES of consumed imported targets as system includes, even if that imported target's :prop_tgt:SYSTEM property is false.

Directories listed in the :prop_tgt:INTERFACE_SYSTEM_INCLUDE_DIRECTORIES property of consumed targets are not affected by NO_SYSTEM_FROM_IMPORTED. Those directories will always be treated as system include directories by consumers.

This property is initialized by the value of the :variable:CMAKE_NO_SYSTEM_FROM_IMPORTED variable if it is set when a target is created.

See the :prop_tgt:EXPORT_NO_SYSTEM target property to set this behavior on the target providing the include directories rather than the target consuming them.