What version number is this target.
For shared libraries
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
attribute is parsed to extract a
<major>.<minor> version number.
These numbers are used as the image version of the binary.
For shared libraries and executables on Mach-O systems (e.g. macOS, iOS),
SOVERSION property corresponds to the compatibility version and
VERSION corresponds to the current version (unless Mach-O
specific overrides are provided, as discussed below).
FRAMEWORK target property for an example.
For shared libraries, the
MACHO_CURRENT_VERSION properties can be used to
override the compatibility version and current version respectively.
SOVERSION will still be used to form the
VERSION may also affect the file
and symlink names.
Versions of Mach-O binaries may be checked with the
otool -L <binary>