LINK_OPTIONS: Add new family of properties

This family enable to manage link flags

Three new properties:
* directory property: LINK_OPTIONS
* target properties: LINK_OPTIONS and INTERFACE_LINK_OPTIONS

Two new commands
* add_link_options(): to populate directory property
* target_link_options(): to populate target properties

Fixes: #16543

1 files changed, 40 insertions, 0 deletions

diff --git a/Help/command/target_link_options.rst b/Help/command/target_link_options.rst
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+++ b/Help/command/target_link_options.rst
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+target_link_options
+-------------------
+
+Add link options to a target.
+
+::
+
+  target_link_options(<target> [BEFORE]
+    <INTERFACE|PUBLIC|PRIVATE> [items1...]
+    [<INTERFACE|PUBLIC|PRIVATE> [items2...] ...])
+
+Specify link options to use when linking a given target.  The
+named ``<target>`` must have been created by a command such as
+:command:`add_executable` or :command:`add_library` and must not be an
+:ref:`ALIAS target <Alias Targets>`.
+
+If ``BEFORE`` is specified, the content will be prepended to the property
+instead of being appended.
+
+This command can be used to add any options, but
+alternative commands exist to add libraries
+(:command:`target_link_libraries` and :command:`link_libraries`).
+See documentation of the :prop_dir:`directory <LINK_OPTIONS>` and
+:prop_tgt:`target <LINK_OPTIONS>` ``LINK_OPTIONS`` properties.
+
+The ``INTERFACE``, ``PUBLIC`` and ``PRIVATE`` keywords are required to
+specify the scope of the following arguments.  ``PRIVATE`` and ``PUBLIC``
+items will populate the :prop_tgt:`LINK_OPTIONS` property of
+``<target>``.  ``PUBLIC`` and ``INTERFACE`` items will populate the
+:prop_tgt:`INTERFACE_LINK_OPTIONS` property of ``<target>``.
+(:ref:`IMPORTED targets <Imported Targets>` only support ``INTERFACE`` items.)
+The following arguments specify compile options.  Repeated calls for the same
+``<target>`` append items in the order called.
+
+Arguments to ``target_link_options`` 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.
+
+.. include:: OPTIONS_SHELL.txt