One of our projects is a cross-platform piece of code. We build it on Windows, Linux, and Solaris/SPARC mostly. Of the 3, we deal with Solaris the least and it's a maintenance pain to keep our SPARC box up and running and in general Solaris administration is not our competency.
A few years back I built a working cross-compiler for SPARC64 on Linux, and that part worked great. What stopped us from going forward was the last part of our build process, which involves building a Solaris package with pkgmk and pkgtrans.
I was never able to find a Linux solution for building pkg files that can be installed on SPARC Solaris -- does anyone know if one exists today?