What version number is this target.
For shared libraries :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.
SOVERSION is ignored if :prop_tgt:
NO_SONAME property is set.
Windows Versions ^^^^^^^^^^^^^^^^
For shared libraries and executables on Windows the :prop_tgt:
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),
SOVERSION property corresponds to compatibility version and
VERSION to current version. See the :prop_tgt:
property for an example. Versions of Mach-O binaries may be checked with the
otool -L <binary> command.