Hello Pavel.
I have been investigating how we can keep GPRbuild from breaking when GCC gets upgraded. It seems that the only practical solution that will work in Koji is to link GPRbuild statically. Here's the discussion in case you haven't followed it on the devel list: https://lists.fedoraproject.org/archives/list/devel%40lists.fedoraproject.or...
The branching of Fedora 24 is scheduled for the second of February. GCC 6 looks like it will enter stage 4 sometime in the middle of January. Around that time I expect GCC 6 to appear in Rawhide. Before that happens we need to have a statically linked GPRbuild ready in Rawhide. Otherwise a bootstrap procedure will be required to get it working again.
The first step is to make an xmlada-static package. Although there is a lot to do before Christmas, I'll try to spend some time making patches. Please tell me if you are also working on this, so we can avoid duplicating the work.
Björn