# INTERFACE_SOURCES

Added in version 4.4.

List of interface sources to compile into consuming targets. The `target_sources()` command sets or adds to the `INTERFACE_SOURCES` file set property for the file sets defined with the `PUBLIC` or `INTERFACE` keyword and is the usual way to manipulate it.

Contents of `INTERFACE_SOURCES` may use `generator expressions`.

Each file must be in one of the base directories, or a subdirectory of one of the base directories.

If relative paths are specified, they are considered relative to the target's source directory.

The following behavior applies for the `SOURCES` and `INTERFACE_SOURCES` file set properties, dependent on the value of the `SCOPE` file set property:

`PRIVATE`

  Only the `SOURCES` property can be set. Any change to the `INTERFACE_SOURCES` property will be ignored.

`PUBLIC`

  `SOURCES` and `INTERFACE_SOURCES` properties will always have the same content.

`INTERFACE`

  Only the `INTERFACE_SOURCES` property can be set. Any change to the `SOURCES` property will be ignored.