From 5c80983e75a749b8e90feb9e0b676ff04daa4776 Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Fri, 22 Jun 2018 12:50:54 +0200
Subject: [PATCH] haskell-generic-builder: bake the package name and version
 into --docdir

If we use a --docdir that's not specific to the package, then different builds
will install their license files into the same location, which leads to file
collisions if those are ever joined into the same environment.

Fixes https://github.com/NixOS/nixpkgs/issues/35024.
---
 pkgs/development/haskell-modules/generic-builder.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/haskell-modules/generic-builder.nix b/pkgs/development/haskell-modules/generic-builder.nix
index 3dd023f3430..9ac88dca83e 100644
--- a/pkgs/development/haskell-modules/generic-builder.nix
+++ b/pkgs/development/haskell-modules/generic-builder.nix
@@ -98,7 +98,7 @@ let
                         else "package-conf";
 
   # the target dir for haddock documentation
-  docdir = docoutput: docoutput + "/share/doc";
+  docdir = docoutput: docoutput + "/share/doc/" + pname + "-" + version;
 
   newCabalFileUrl = "http://hackage.haskell.org/package/${pname}-${version}/revision/${revision}.cabal";
   newCabalFile = fetchurl {