The Solaris software is currently delivered in separate packages for 32-bit and 64-bit components. The 64-bit packages, introduced in the Solaris 7 release, deliver the 64-bit components of the Solaris software. In general, the 64-bit package name ends with the letter x. For example, SUNWcsl delivers the 32-bit version of the Solaris Core Libraries, and SUNWcslx delivers the 64-bit version.
In a future Solaris release, 32-bit and 64-bit components might be delivered together in a single base package. The combined package retains the name of the original 32-bit package, and the 64-bit package would no longer be delivered. For example, /usr/lib/sparcv9/libc.so.1, which is currently delivered in SUNWcslx, would be delivered in SUNWcsl and SUNWcslx would no longer be delivered.
Some packages only deliver 64-bit components and have no corresponding 32-bit package. In these cases, the packages might be renamed to remove the “x” suffix. For example, SUNW1394x might become SUNW1394.