I took a look a the list of the current blocker of gcc-4.8 and many / most of them seem to be hardend or x86 related. Right now I'm using an amd64 linux with some freaky "lto + heavily optimized" make.conf flags and didn't find a gcc-4.8 related bug. Except the usual list of package just not ready for lto.
But if anyone would ask me to stabilize gcc-4.8 I would say "amd64 ok".
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