From 7a20d764827f12bdd783a63a14ff0b2b9fcfeb96 Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Tue, 21 Oct 2014 23:30:55 +0200
Subject: [PATCH] Disable all Haskell builds for Darwin on Hydra.

Hydra generates a GHC closure for Darwin that for no apparent reason
contains an ancient, broken Haddock binary -- probably because of an
impurity in the build system. That bug makes those GHC binaries
unusable: <https://github.com/NixOS/nixpkgs/issues/2689>.
---
 pkgs/build-support/cabal/default.nix     |  7 +++++++
 pkgs/development/compilers/ghc/7.8.3.nix | 14 +++++++-------
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/pkgs/build-support/cabal/default.nix b/pkgs/build-support/cabal/default.nix
index a55de86cb15..2b06adf3490 100644
--- a/pkgs/build-support/cabal/default.nix
+++ b/pkgs/build-support/cabal/default.nix
@@ -57,6 +57,13 @@ assert !enableStaticLibraries -> versionOlder "7.7" ghc.version;
                 propagatedUserEnvPkgs = filter (y : ! (y == null)) x.propagatedUserEnvPkgs;
                 doCheck               = enableCheckPhase && x.doCheck;
                 hyperlinkSource       = enableHyperlinkSource && x.hyperlinkSource;
+                # Disable Darwin builds: <https://github.com/NixOS/nixpkgs/issues/2689>.
+                meta                  = let meta = x.meta;
+                                            hydraPlatforms = meta.hydraPlatforms or meta.platforms or [];
+                                            noElem         = p: ps: !stdenv.lib.elem p ps;
+                                            noDarwin       = p: noElem p stdenv.lib.platforms.darwin;
+                                        in
+                                        meta // { hydraPlatforms = filter noDarwin hydraPlatforms; };
               };
 
         defaults =
diff --git a/pkgs/development/compilers/ghc/7.8.3.nix b/pkgs/development/compilers/ghc/7.8.3.nix
index dbcba36fa8f..0c142883e65 100644
--- a/pkgs/development/compilers/ghc/7.8.3.nix
+++ b/pkgs/development/compilers/ghc/7.8.3.nix
@@ -32,15 +32,15 @@ stdenv.mkDerivation rec {
   # that in turn causes GHCi to abort
   stripDebugFlags = [ "-S" "--keep-file-symbols" ];
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = "http://haskell.org/ghc";
     description = "The Glasgow Haskell Compiler";
-    maintainers = [
-      stdenv.lib.maintainers.marcweber
-      stdenv.lib.maintainers.andres
-      stdenv.lib.maintainers.simons
-    ];
-    inherit (ghc.meta) license platforms;
+    maintainers = [ maintainers.marcweber maintainers.andres maintainers.simons ];
+    inherit (ghc.meta) license;
+    # Filter old "i686-darwin" platform which is unsupported these days.
+    platforms = filter (x: elem x platforms.all) ghc.meta.platforms;
+    # Disable Darwin builds: <https://github.com/NixOS/nixpkgs/issues/2689>.
+    hydraPlatforms = filter (x: !elem x platforms.darwin) meta.platforms;
   };
 
 }