-optl doesn't seem to pass to ld (on Windows)

-optl--enable-stdcall-fixup With ghc-6.6.1 on WinXP, I want to pass --enable-stdcall-fixup (or --disable-stdcall-fixup, depending on my mood) to ld, but either the -optl option doesn't seem to work, or I've misunderstood what it's meant to do. ghc -v indicates that it is not in the parameters passed to ld.exe. Alistair