powerpc/linux: undefined reference to `__sync_sub_and_fetch_8

Ever since [changeset:"04e83666/ghc"] I've been getting this on powerpc/linux:

/home/erikd/Git/ghc-upstream/rts/dist/build/libHSrts.a(Linker.o):
In function `m32_free_internal':

/home/erikd/Git/ghc-upstream/rts/Linker.c:1220:0: error:
     undefined reference to `__sync_sub_and_fetch_8'
collect2: error: ld returned 1 exit status

Trac metadata

Trac field	Value
Version	7.11
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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Architecture