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You have 64-bit arch as multilib implies. But your /etc/pacman.conf file has the multilib repository commented. uncomment it in the same manner your other ones are. Been having these weird errors for a long time myself. And I suspect this is the cause and solution. Seems simple enough.
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Are you talking about https://bbs.archlinux.org/viewtopic.php?id=135702 ?
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Yeah, I think there was a point I was affected by that same thing. And then something similar hit me again, but I found that the multilib repository was commented. Something I never specifically did, myself. However, I see according to the links, multilib was enabled during other user's issues.
As a side-note, sometimes the arch forums and google both come up with very little relevant information. Like it did to me today. I got one hit on gcc-multilib from google, and zero returns on arch forums. Really. Pathetically impossible but true. Thanks for the additional link.
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The forum search acts up at times, I use google almost exclusively.
site:bbs.archlinux.org gcc-multilibreturns quite a few hits (and you can tell google to show the results just from e.g. last year, last month etc.)
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