Comment # 12 on bug 1032050 from Richard Biener

After some digging with Werner the theory is that libgcj_bc1-gcc48 present on
the system made the update apply at all (it provides libgcj_bc1) and then
things went downhill, also installing the rest of the gcc6 runtime (which
wasn't present on the system).

I suppose if a patch applies then all packages in that patch are installed, not
just those that are update candidates themselves.  This suggests that gcc
updates should be split, otherwise somebody having just gcc installed will get
gcc-c++ installed on update for example?