NO_SYSTEM_FROM_IMPORTED

Do not treat include directories from the interfaces of consumed Imported Targets as system directories.

The contents of the INTERFACE_INCLUDE_DIRECTORIES target property are treated as system includes when the consumed target's SYSTEM property is set to true. By default, 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 INTERFACE_INCLUDE_DIRECTORIES of consumed imported targets as system includes, even if that imported target's SYSTEM property is false.

Directories listed in the 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 CMAKE_NO_SYSTEM_FROM_IMPORTED variable if it is set when a target is created.

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