arbor:
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As far as qemu virtual mips there are some decent choices. You can use the malta snapshot from OpenWRT trunk (http://downloads.openwrt.org/snapshots/trunk/malta/). It's specifically for running in qemu .
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I found few catch about malta;-
http://downloads.openwrt.org/snapshots/trunk/malta/ is for little-endian image, AR9331 is big-endian, I manage to compile big-endian image as well as GCC for it, but Yun's OS is attitude_adjustment and so no go here.
Index of /attitude_adjustment/12.09/malta/generic/ is empty, means upstream OS fail to compile it.
I manage to compile big-endian image for attitude_adjustment and have not chance to compile GCC yet.
an other problem is qemu's mips support is limit at Max 256MiB RAM. I would like to have 4GiB RAM.