The log is attached, I propose to just filter this flag for now.
Created attachment 50047 [details] 3407-fam-2.7.0-r2.log
mmm i'm not big fan of adding filters for everything and the kitchen sink. Why would i want to add this ? Plus that i consider fam pretty much obsolete.
I just installed it, because it's a dependecie of something. CXXFLAGS="${CFLAGS} -fvisibility=hidden" is a feature of gcc-3.4 to make libraries smaller by only exporting the needed symbols and therfore improve load times.
invalid for now, this flag should only be enabled per package