Getting a profiled GHC with hadrian.

Hello Devs, What's the proper way to get a profiled GHC in hadrian? I tried hadrian/build.cabal.sh -j8 --flavour=Prof but that didn't work out: $ _build/stage1/bin/ghc.exe +RTS -p ghc.exe: the flag -p requires the program to be built with -prof ghc.exe: ... What am I doing wrong here? Cheers Andreas