ghc: add Darwin patch for #10322

pkgs/development/compilers/ghc/7.10.1.nix

@@ -42,6 +42,9 @@ stdenv.mkDerivation rec {
       url = "https://git.haskell.org/ghc.git/patch/c46e4b184e0abc158ad8f1eff6b3f0421acaf984";
       sha256 = "0fkdyqd4bqp742rydwmqq8d2n7gf61bgdhaiw8xf7jy0ix7lr60w";
     })
+    # Fix TH + indirect symbol resolution on OSX (or any system using gold linker)
+    # https://phabricator.haskell.org/D852
+    ./osx-dylib-resolver.patch
   ];
 
   postPatch = ''

pkgs/development/compilers/ghc/osx-dylib-resolver.patch

@@ -0,0 +1,60 @@
+diff --git a/compiler/ghci/Linker.hs b/compiler/ghci/Linker.hs
+--- a/compiler/ghci/Linker.hs
++++ b/compiler/ghci/Linker.hs
+@@ -119,9 +119,9 @@
+         -- that is really important
+         pkgs_loaded :: ![PackageKey],
+ 
+-        -- we need to remember the name of the last temporary DLL/.so
+-        -- so we can link it
+-        last_temp_so :: !(Maybe (FilePath, String)) }
++        -- we need to remember the name of previous temporary DLL/.so
++        -- libraries so we can link them (see #10322)
++        temp_sos :: ![(FilePath, String)] }
+ 
+ 
+ emptyPLS :: DynFlags -> PersistentLinkerState
+@@ -131,7 +131,7 @@
+                         pkgs_loaded = init_pkgs,
+                         bcos_loaded = [],
+                         objs_loaded = [],
+-                        last_temp_so = Nothing }
++                        temp_sos = [] }
+ 
+   -- Packages that don't need loading, because the compiler
+   -- shares them with the interpreted program.
+@@ -841,19 +841,19 @@
+         dflags2 = dflags1 {
+                       -- We don't want the original ldInputs in
+                       -- (they're already linked in), but we do want
+-                      -- to link against the previous dynLoadObjs
+-                      -- library if there was one, so that the linker
++                      -- to link against previous dynLoadObjs
++                      -- libraries if there were any, so that the linker
+                       -- can resolve dependencies when it loads this
+                       -- library.
+                       ldInputs =
+-                        case last_temp_so pls of
+-                          Nothing -> []
+-                          Just (lp, l)  ->
++                        concatMap
++                            (\(lp, l) ->
+                                  [ Option ("-L" ++ lp)
+                                  , Option ("-Wl,-rpath")
+                                  , Option ("-Wl," ++ lp)
+                                  , Option ("-l" ++  l)
+-                                 ],
++                                 ])
++                            (temp_sos pls),
+                       -- Even if we're e.g. profiling, we still want
+                       -- the vanilla dynamic libraries, so we set the
+                       -- ways / build tag to be just WayDyn.
+@@ -868,7 +868,7 @@
+     consIORef (filesToNotIntermediateClean dflags) soFile
+     m <- loadDLL soFile
+     case m of
+-        Nothing -> return pls { last_temp_so = Just (libPath, libName) }
++        Nothing -> return pls { temp_sos = (libPath, libName) : temp_sos pls }
+         Just err -> panic ("Loading temp shared object failed: " ++ err)
+ 
+ rmDupLinkables :: [Linkable]    -- Already loaded