LINK_DEPENDS: add support for property INTERFACE_LINK_DEPENDS

Fixes: #17997

2 files changed, 33 insertions, 2 deletions

diff --git a/Help/prop_tgt/INTERFACE_LINK_DEPENDS.rst b/Help/prop_tgt/INTERFACE_LINK_DEPENDS.rst
new file mode 100644
index 0000000..d07f8ea
--- /dev/null
+++ b/Help/prop_tgt/INTERFACE_LINK_DEPENDS.rst
@@ -0,0 +1,31 @@
+INTERFACE_LINK_DEPENDS
+----------------------
+
+Additional public interface files on which a target binary depends for linking.
+
+This property is supported only by Makefile and Ninja generators.  It is
+intended to specify dependencies on "linker scripts" for custom Makefile link
+rules.
+
+When target dependencies are specified using :command:`target_link_libraries`,
+CMake will read this property from all target dependencies to determine the
+build properties of the consumer.
+
+Contents of ``INTERFACE_LINK_DEPENDS`` 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.
+
+Link dependency files usage requirements commonly differ between the build-tree
+and the install-tree.  The ``BUILD_INTERFACE`` and ``INSTALL_INTERFACE``
+generator expressions can be used to describe separate usage requirements
+based on the usage location.  Relative paths are allowed within the
+``INSTALL_INTERFACE`` expression and are interpreted relative to the
+installation prefix.  For example:
+
+.. code-block:: cmake
+
+  set_property(TARGET mylib PROPERTY INTERFACE_LINK_DEPENDS
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/mylinkscript>
+    $<INSTALL_INTERFACE:mylinkscript>  # <prefix>/mylinkscript
+  )
diff --git a/Help/prop_tgt/LINK_DEPENDS.rst b/Help/prop_tgt/LINK_DEPENDS.rst
index 5576b85..bc83393 100644
--- a/Help/prop_tgt/LINK_DEPENDS.rst
+++ b/Help/prop_tgt/LINK_DEPENDS.rst
@@ -7,6 +7,6 @@ Specifies a semicolon-separated list of full-paths to files on which
 the link rule for this target depends.  The target binary will be
 linked if any of the named files is newer than it.
 
-This property is ignored by non-Makefile generators.  It is intended
-to specify dependencies on "linker scripts" for custom Makefile link
+This property is supported only by Makefile and Ninja generators.  It is
+intended to specify dependencies on "linker scripts" for custom Makefile link
 rules.