It seems to miscompile libs/plasma/CMakeFiles/plasma.dir/svg.o into a "data" file (per file command) instead of an ELF object. Also does that to libs/plasma/CMakeFiles/plasma.dir/glapplet.o, so once svg.o would be fine, it'd stumble on that. And then it fails on link stage.
Created attachment 155847 [details] build.log showing the build error
Created attachment 155849 [details] emerge --info I have also tried with MAKEOPTS="-j1"
I just hit the same kind of problem in wine too (while many other packages do succeed), so I'm marking this as INVALID for the time being, until I investigate if this isn't a toolchain problem (and keep this bug closed if it is).