Help: Describe VERSION and SOVERSION meanings for Mach-O binaries

1 files changed, 19 insertions, 6 deletions

diff --git a/Help/prop_tgt/SOVERSION.rst b/Help/prop_tgt/SOVERSION.rst
index 672ff23..82b6b97 100644
--- a/Help/prop_tgt/SOVERSION.rst
+++ b/Help/prop_tgt/SOVERSION.rst
@@ -3,12 +3,25 @@ SOVERSION
 
 What version number is this target.
 
-For shared libraries VERSION and SOVERSION can be used to specify the
-build version and API version respectively.  When building or
+For shared libraries :prop_tgt:`VERSION` and ``SOVERSION`` can be used to
+specify the build version and API version respectively.  When building or
 installing appropriate symlinks are created if the platform supports
 symlinks and the linker supports so-names.  If only one of both is
 specified the missing is assumed to have the same version number.
-SOVERSION is ignored if NO_SONAME property is set.  For shared
-libraries and executables on Windows the VERSION attribute is parsed
-to extract a "major.minor" version number.  These numbers are used as
-the image version of the binary.
+``SOVERSION`` is ignored if :prop_tgt:`NO_SONAME` property is set.
+
+Windows Versions
+^^^^^^^^^^^^^^^^
+
+For shared libraries and executables on Windows the :prop_tgt:`VERSION`
+attribute is parsed to extract a ``<major>.<minor>`` version number.
+These numbers are used as the image version of the binary.
+
+Mach-O Versions
+^^^^^^^^^^^^^^^
+
+For shared libraries and executables on Mach-O systems (e.g. OS X, 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.