fendor

> sources = import nix/sources.nix
> pkgs = import sources.nixpkgs {}
> pkgs.haskell.packages.
pkgs.haskell.packages.ghc8101         pkgs.haskell.packages.ghc865          pkgs.haskell.packages.ghc883          pkgs.haskell.packages.ghcjs86
pkgs.haskell.packages.ghc822Binary    pkgs.haskell.packages.ghc865Binary    pkgs.haskell.packages.ghcHEAD         pkgs.haskell.packages.integer-simple
pkgs.haskell.packages.ghc844          pkgs.haskell.packages.ghc882          pkgs.haskell.packages.ghcjs

fendor

Jul 27 21:04:52 <fendor>	Hi! I have a question regarding per-component builds. In the context of my gsoc, I am trying to extend Cabal/cabal-install to open a repl session for multiple components at once, e.g. it should support `caal repl <lib> <exe>`. My first step was to allow in Cabal `runghc Setup.hs repl <lib> <exe>` which works if the project is configured via `cabal configure`, which seems to be the old way of doing stuff. As far as I can tell, cabal 
Jul 27 21:04:52 <fendor>	uses per-component builds, e.g. it configures a component, then builds it immediately. The problem now is that I can not call Cabal directly via `runghc Setup.hs repl <lib> <exe>` because the library component is not configured.  
Jul 27 21:05:46 <fendor>	It is not configured, since <exe> got configured after building the lib, which causes lib to be un-configured, afaict.
Jul 27 21:07:48 <fendor>	My first question is, are these findings correct? If yes, the follow-up question is how can we change Cabal or cabal, to either allow to 

fendor

• Couldn't match type ‘PackageIdentifier’
                 with ‘PackageIdentifier’
  NB: ‘PackageIdentifier’
        is defined in ‘Distribution.Types.PackageId’
            in package ‘Cabal-3.3.0.0’
      ‘PackageIdentifier’
        is defined in ‘Distribution.Types.PackageId’ in package ‘fake_uid’
  Expected type: PackageIdentifier
    Actual type: PackageId
• In the second argument of ‘Sec.indexLookupHash’, namely ‘pkgid’

fendor

Compute Avails for A from unitA
Compute Avails info
  imp_mods [(Prelude, [ImportedByUser Prelude])]
  imp_dep_mods []
  imp_dep_pkgs {base-4.15.0.0, ghc-bignum-1.0, ghc-prim-0.7.0}
  imp_trust_pkgs {}
  imp_orphs [GHC.Float, GHC.Base]
  imp_finsts [Control.Applicative, Control.Arrow, Data.Functor.Const,
              Data.Functor.Identity, Data.Monoid, Data.Semigroup.Internal,
              GHC.Generics, GHC.IO.Exception]

fendor

{
	"resource": "/",
	"owner": "Haskell HIE (ghc)",
	"severity": 8,
	"message": "ghcide: panic! (the 'impossible' happened)\n  (GHC version 8.8.3 for x86_64-unknown-linux):\n\tv_unsafeGlobalDynFlags: settings not initialised\n\nPlease report this as a GHC bug:  https://www.haskell.org/ghc/reportabug\n",
	"source": "compiler",
	"startLineNumber": 1,
	"startColumn": 1,
	"endLineNumber": 2,
	"endColumn": 1

fendor

> ghc --show-iface A.hi
Magic: Wanted 33214052,
       got    33214052
Version: Wanted 811020200619,
         got    811020200619
Way: Wanted [],
     got    []
interface A 811020200619
  interface hash: 120b821b3411beeb07e93a2bc9f9e1fb
  ABI hash: d5211d2744c739022b3b8359f5964daa

fendor

attempting to use module ‘fake_uid:GHC.Prelude’ (/home/munin/Documents/haskell/ghc/compiler/GHC/Prelude.hs) which is not loaded

fendor

/home/munin/.cache/ghcide/ghc-28550f3bded7653efbc0f19994a3f4227f88ca8e/GHC/Builtin/PrimOps.hi-boot: openBinaryFile: does not exist (No such file or directory)

fendor

cradle:
  stack:

fendor

cradle:
  multi:
    - path: ./.
      config:
        cradle:
          cabal:
    - path: ./mylib/test
      config:
        cradle:
          cabal: