tests do not link with gccgo

This is strange:

mwhudson@narsil:goplay$ go test -compiler gccgo labix.org/v2/mgo
# testmain
/tmp/go-build503794647/labix.org/v2/mgo/_test/labix.org/v2/libmgo_test.a(mgo_test.o): In function `mgo_test.cLogger$hash':
/home/mwhudson/goplay/src/labix.org/v2/mgo/suite_test.go:240: undefined reference to `launchpad.net_gocheck.timer$hash'
collect2: error: ld returned 1 exit status
FAIL labix.org/v2/mgo [build failed]

At a wild guess code in mgo's tests causes a gocheck.timer to be shoved into a map but for some reason the hash function is not compiled when you compile libgocheck.a?