ghc-7.10.1-rc1 build GC log messages

Building ghc-7.10.1-rc1, I see the following new messages: HC [stage 1] compiler/stage2/build/Dwarf.p_o <> Is this a debug log or normal from now on during a ghc build? I don't mind, but I just wanted to make sure it's not a mistakenly enabled debug flag somewhere.