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

3 files changed, 43 insertions, 13 deletions

diff --git a/Help/prop_tgt/FRAMEWORK.rst b/Help/prop_tgt/FRAMEWORK.rst
index 6c212c3..8120c36 100644
--- a/Help/prop_tgt/FRAMEWORK.rst
+++ b/Help/prop_tgt/FRAMEWORK.rst
@@ -26,6 +26,10 @@ Example of creation ``dynamicFramework``:
     FRAMEWORK_VERSION C
     MACOSX_FRAMEWORK_IDENTIFIER com.cmake.dynamicFramework
     MACOSX_FRAMEWORK_INFO_PLIST Info.plist
+    # "current version" in semantic format in Mach-O binary file
+    VERSION 16.4.0
+    # "compatibility version" in semantic format in Mach-O binary file
+    SOVERSION 1.0.0
     PUBLIC_HEADER dynamicFramework.h
     XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "iPhone Developer"
   )
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.
diff --git a/Help/prop_tgt/VERSION.rst b/Help/prop_tgt/VERSION.rst
index 87f6c49..66e7bde 100644
--- a/Help/prop_tgt/VERSION.rst
+++ b/Help/prop_tgt/VERSION.rst
@@ -3,14 +3,27 @@ VERSION
 
 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 ``VERSION`` and :prop_tgt:`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.  For
-executables VERSION can be used to specify the build version.  When
+executables ``VERSION`` can be used to specify the build version.  When
 building or installing appropriate symlinks are created if the
-platform supports symlinks.  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.
+platform supports symlinks.
+
+Windows Versions
+^^^^^^^^^^^^^^^^
+
+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.
+
+Mach-O Versions
+^^^^^^^^^^^^^^^
+
+For shared libraries and executables on Mach-O systems (e.g. OS X, iOS),
+the :prop_tgt:`SOVERSION` property correspond to *compatibility version* and
+``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.