macOS: Add OSX_COMPATIBILITY_VERSION and OSX_CURRENT_VERSION properties

Fixes: #17652

4 files changed, 37 insertions, 6 deletions

diff --git a/Help/prop_tgt/OSX_COMPATIBILITY_VERSION.rst b/Help/prop_tgt/OSX_COMPATIBILITY_VERSION.rst
new file mode 100644
index 0000000..1694df1
--- /dev/null
+++ b/Help/prop_tgt/OSX_COMPATIBILITY_VERSION.rst
@@ -0,0 +1,14 @@
+OSX_COMPATIBILITY_VERSION
+-------------------------
+
+What current version number is this target for OSX.
+
+For shared libraries on Mach-O systems (e.g. macOS, iOS)
+the ``OSX_COMPATIBILITY_VERSION`` property correspond to
+``compatibility version`` and :prop_tgt:`OSX_CURRENT_VERSION` to
+``current version``.
+See the :prop_tgt:`FRAMEWORK` target property for an example.
+
+Versions of Mach-O binaries may be checked with the ``otool -L <binary>``
+command.  If ``OSX_COMPATIBILITY_VERSION`` is not set, the value of
+the :prop_tgt:``SOVERSION`` property will be used.
diff --git a/Help/prop_tgt/OSX_CURRENT_VERSION.rst b/Help/prop_tgt/OSX_CURRENT_VERSION.rst
new file mode 100644
index 0000000..609924d
--- /dev/null
+++ b/Help/prop_tgt/OSX_CURRENT_VERSION.rst
@@ -0,0 +1,13 @@
+OSX_CURRENT_VERSION
+-------------------
+
+What current version number is this target for OSX.
+
+For shared libraries on Mach-O systems (e.g. macOS, iOS)
+the :prop_tgt:`OSX_COMPATIBILITY_VERSION` property correspond to
+``compatibility version`` and ``OSX_CURRENT_VERSION`` to ``current version``.
+See the :prop_tgt:`FRAMEWORK` target property for an example.
+
+Versions of Mach-O binaries may be checked with the ``otool -L <binary>``
+command.  If ``OSX_CURRENT_VERSION`` is not set, the value of
+the :prop_tgt:``VERSION`` property will be used.
diff --git a/Help/prop_tgt/SOVERSION.rst b/Help/prop_tgt/SOVERSION.rst
index b07c17c..1a66c8f 100644
--- a/Help/prop_tgt/SOVERSION.rst
+++ b/Help/prop_tgt/SOVERSION.rst
@@ -21,7 +21,9 @@ Mach-O Versions
 ^^^^^^^^^^^^^^^
 
 For shared libraries and executables on Mach-O systems (e.g. macOS, iOS),
-the ``SOVERSION`` property corresponds to *compatibility version* and
-:prop_tgt:`VERSION` to *current version*.  See the :prop_tgt:`FRAMEWORK` target
-property for an example.  Versions of Mach-O binaries may be checked with the
-``otool -L <binary>`` command.
+the ``SOVERSION`` property is a fallback to
+:prop_tgt:`OSX_COMPATIBILITY_VERSION` property which corresponds to
+*compatiblity version* and :prop_tgt:`VERSION` is a fallback to
+:prop_tgt:`OSX_CURRENT_VERSION` which corresponds to *current version*.
+See the :prop_tgt:`FRAMEWORK` target property for an example.  Versions
+of Mach-O binaries may be checked with the ``otool -L <binary>`` command.
diff --git a/Help/prop_tgt/VERSION.rst b/Help/prop_tgt/VERSION.rst
index ff3b303..a24b613 100644
--- a/Help/prop_tgt/VERSION.rst
+++ b/Help/prop_tgt/VERSION.rst
@@ -23,7 +23,9 @@ Mach-O Versions
 ^^^^^^^^^^^^^^^
 
 For shared libraries and executables on Mach-O systems (e.g. macOS, iOS),
-the :prop_tgt:`SOVERSION` property correspond to *compatibility version* and
-``VERSION`` to *current version*.  See the :prop_tgt:`FRAMEWORK` target
+the ``VERSION`` property is a fallback to :prop_tgt:`OSX_CURRENT_VERSION`
+property which corresponds to *current version* and :prop_tgt:`SOVERSION`
+is a fallback to :prop_tgt:`OSX_COMPATIBILITY_VERSION` which corresponds
+to *compatiblity version*.  See the :prop_tgt:`FRAMEWORK` target
 property for an example.  Versions of Mach-O binaries may be checked with the
 ``otool -L <binary>`` command.