CMake/Help/prop_tgt/INTERFACE_SOURCES.rst

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INTERFACE_SOURCES
-----------------
List of interface sources to compile into consuming targets.
Targets may populate this property to publish the sources
for consuming targets to compile. The :command:`target_sources` command
populates this property with values given to the ``PUBLIC`` and
``INTERFACE`` keywords. Projects may also get and set the property directly.
When target dependencies are specified using :command:`target_link_libraries`,
CMake will read this property from all target dependencies to determine the
sources of the consumer.
Contents of ``INTERFACE_SOURCES`` may use "generator expressions"
with the syntax ``$<...>``. See the :manual:`cmake-generator-expressions(7)`
manual for available expressions. See the :manual:`cmake-buildsystem(7)`
manual for more on defining buildsystem properties.