Three days ago I decided to switch to gcc 4.3 and rebuild my system (gcc 4.3 has core2 support). Unfortunately portage decided to preserve a lot of libraries during my "emerge -e system" and "emerge -e world". The following "emerge @preserved-rebuild" did stopped in the first ebuild trying to rebuild the "boost" library ! Revdep-rebuild wanted to rebuild 300+ packages but failed with boost too. I got my system up and running again by deleting the "preserve library X" files by hand (found a forum post about it) and doing an "emerge -e system" again. After this "revdep-rebuild" only had to recompile ~30 packages... I think the @preserved-rebuild feature should be either OFF by default or at least OFF for "emerge -e" commands.
Just set FEATURES=-preserve-libs when you want to disable it.
Thank you... maybe it should be deactivated by DEFAULT for "emerge -e world/system".
(In reply to comment #2) > Thank you... > > maybe it should be deactivated by DEFAULT for "emerge -e world/system". No. Not only would it be confusing, but also such special cases are a maintenance nightmare in the long run.
