Failure to build with `stack build --nix` on NixOS

[ethercrow]

ihaskell-inline-r-0.1.1.0: configure
ihaskell-inline-r-0.1.1.0: build

--  While building package ihaskell-inline-r-0.1.1.0 using:
      /home/ethercrow/.stack/setup-exe-cache/x86_64-linux-nix/setup-Simple-Cabal-1.22.5.0-ghc-7.10.3 --builddir=.stack-work/dist/x86_64-linux-nix/Cabal-1.22.5.0 build lib:ihaskell-inline-r --ghc-options " -ddump-hi -ddump-to-file"
    Process exited with code: ExitFailure 1
    Logs have been written to: /home/ethercrow/src/HaskellR/.stack-work/logs/ihaskell-inline-r-0.1.1.0.log

    Configuring ihaskell-inline-r-0.1.1.0...
    Preprocessing library ihaskell-inline-r-0.1.1.0...
    [1 of 1] Compiling IHaskell.Display.InlineR ( src/IHaskell/Display/InlineR.hs, .stack-work/dist/x86_64-linux-nix/Cabal-1.22.5.0/build/IHaskell/Display/InlineR.o )
    <command line>: can't load .so/.DLL for: libncursesw.so (libncursesw.so: cannot open shared object file: No such file or directory)

Is this related: https://ghc.haskell.org/trac/ghc/ticket/11042?

[mboes]

It is indeed. @YPares we need Stack to restore the LD_LIBRARY_PATH workaround which I believe was there at some point. i.e. match what the haskell.lib.buildStackProject function from Nixpkgs does.

@ethercrow you can work around this by using an explicit shell file. Uncomment the shell-file: line in the stack.yaml. And if you're using Nixpkgs unstable then amend the shell file to include a ghc argument as documented here: https://github.com/NixOS/nixpkgs/blob/master/doc/languages-frameworks/haskell.md#how-to-build-a-haskell-project-using-stack.

[ethercrow]

Commenting packages and uncommenting shell-file results in:

~/src/HaskellR master*  
> stack build --nix
error: infinite recursion encountered, at /nix/store/z21asrspz2nc471jzjg4kc68lxv38288-nixos/nixos/pkgs/development/haskell-modules/generic-stack-builder.nix:8:9
(use ‘--show-trace’ to show detailed location information)

I use nixos-unstable channel, so I've tried this amendment you pointed at:

--- a/shell.nix
+++ b/shell.nix
@@ -2,7 +2,9 @@
 # the --enable-strict-barrier configure flag enabled for better memory
 # diagnostics.

-with (import <nixpkgs> { });
+{nixpkgs ? import <nixpkgs> { }, ghc ? nixpkgs.ghc}
+
+import nixpkgs;

 with stdenv.lib;

This results in the following error:

> stack build --nix               
error: syntax error, unexpected ID, expecting ':' or '@', at /home/ethercrow/src/HaskellR/shell.nix:7:1

[mboes]

You missed a ::

+{nixpkgs ? import <nixpkgs> { }, ghc ? nixpkgs.ghc}:

Also, you're getting the "infinite recursion" because your patch doesn't include the inherit ghc line in the body of the argument to haskell.lib.buildStackProject. See the doc I linked to previously.

[ethercrow]

The doc doesn't have the :. My bad about missing inherit ghc. Still failing though:

~/src/HaskellR master*  
> git diff shell.nix 
diff --git a/shell.nix b/shell.nix
index 5096c02..18d0906 100644
--- a/shell.nix
+++ b/shell.nix
@@ -2,7 +2,9 @@
 # the --enable-strict-barrier configure flag enabled for better memory
 # diagnostics.

-with (import <nixpkgs> { });
+{nixpkgs ? import <nixpkgs> { }, ghc ? nixpkgs.ghc}:
+
+import nixpkgs;

 with stdenv.lib;

@@ -14,4 +16,5 @@ haskell.lib.buildStackProject {
   name = "HaskellR";
   buildInputs = [ ncurses pkgconfig python34Packages.ipython R zeromq zlib ];
   LANG = "en_US.UTF-8";
+  inherit ghc;
 }

~/src/HaskellR master*  
> stack build --nix 
error: syntax error, unexpected ';', expecting $end, at /home/ethercrow/src/HaskellR/shell.nix:7:15

[ethercrow]

I was able to get build working with this shell-file patch:

diff --git a/shell.nix b/shell.nix
index 5096c02..76a64a9 100644
--- a/shell.nix
+++ b/shell.nix
@@ -2,16 +2,20 @@
 # the --enable-strict-barrier configure flag enabled for better memory
 # diagnostics.

-with (import <nixpkgs> { });
+{ pkgs ? import <nixpkgs> {} }:

-with stdenv.lib;
+with pkgs;

 let
   R = pkgs.R.override { enableStrictBarrier = true; };
 in

-haskell.lib.buildStackProject {
+stdenv.mkDerivation {
   name = "HaskellR";
-  buildInputs = [ ncurses pkgconfig python34Packages.ipython R zeromq zlib ];
-  LANG = "en_US.UTF-8";
-}
+
+  buildInputs = [ ncurses.out ncurses.dev pkgconfig python34Packages.ipython R zeromq zlib.out haskell.compiler.ghc7103 ];
+
+  shellHook = ''
+    export LD_LIBRARY_PATH="${ncurses.out}/lib:${zlib.out}/lib:$LD_LIBRARY_PATH"
+  '';
+}

[mboes]

Fixed in master.