Building HEAD fails with -j3 because of unrecorded dependencies.
There seem to be some missing dependencies.
"inplace/bin/ghc-stage1" -hisuf hi -osuf o -hcsuf hc -static -O -H64m -Wall -this-unit-id ghc-prim-0.5.2.0 -hide-all-packages -i -ilibraries/ghc-prim/. -ilibraries/ghc-prim/dist-install/build -Ilibraries/ghc-prim/dist-install/build -ilibraries/ghc-prim/dist-install/build/./autogen -Ilibraries/ghc-prim/dist-install/build/./autogen -Ilibraries/ghc-prim/. -optP-include -optPlibraries/ghc-prim/dist-install/build/./autogen/cabal_macros.h -package-id rts -this-unit-id ghc-prim -XHaskell2010 -O2 -no-user-package-db -rtsopts -Wno-trustworthy-safe -Wno-deprecated-flags -Wnoncanonical-monad-instances -odir libraries/ghc-prim/dist-install/build -hidir libraries/ghc-prim/dist-install/build -stubdir libraries/ghc-prim/dist-install/build -dynamic-too -c libraries/ghc-prim/./GHC/Magic.hs -o libraries/ghc-prim/dist-install/build/GHC/Magic.o -dyno libraries/ghc-prim/dist-install/build/GHC/Magic.dyn_o libraries/base/GHC/IO.hs-boot:9:12: error: • Failed to load interface for ‘GHC.Integer.Type’ There are files missing in the ‘integer-gmp-220.127.116.11’ package, try running 'ghc-pkg check'. Use -v to see a list of the files searched for. • In the type signature: mplusIO :: IO a -> IO a -> IO a | 9 | mplusIO :: IO a -> IO a -> IO a | ^^^^^^^^^^^^^^^^^^^^
It seems Magic.hs depends in integer-gmp. Which happened to be not yet built so it fails.
I'm not sure which import it is that is missing but recording it here.
Commit for head is 72b5f649
Building single threaded for a while and then continuing the build with -j3 seems to be a valid workaround.