From b09a788e13712f694f12ea1d0fdbf630395effd2 Mon Sep 17 00:00:00 2001
From: John Wiegley <johnw@newartisans.com>
Date: Sun, 25 May 2014 03:29:24 -0500
Subject: [PATCH] Correct patch the rpath for GHC-built executables on Darwin

@peti This addresses #2488.
---
 pkgs/build-support/cabal/default.nix | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/pkgs/build-support/cabal/default.nix b/pkgs/build-support/cabal/default.nix
index 70fb72f99fb..7605d863c21 100644
--- a/pkgs/build-support/cabal/default.nix
+++ b/pkgs/build-support/cabal/default.nix
@@ -197,6 +197,9 @@ assert !enableStaticLibraries -> versionOlder "7.7" ghc.version;
               ${optionalString (self.enableSharedExecutables && self.stdenv.isLinux) ''
                 configureFlags+=" --ghc-option=-optl=-Wl,-rpath=$out/lib/${ghc.ghc.name}/${self.pname}-${self.version}";
               ''}
+              ${optionalString (self.enableSharedExecutables && self.stdenv.isDarwin) ''
+                configureFlags+=" --ghc-option=-optl=-Wl,-headerpad_max_install_names";
+              ''}
 
               echo "configure flags: $extraConfigureFlags $configureFlags"
               ./Setup configure --verbose --prefix="$out" --libdir='$prefix/lib/$compiler' \
@@ -256,6 +259,13 @@ assert !enableStaticLibraries -> versionOlder "7.7" ghc.version;
                 ln -s $out/nix-support/propagated-native-build-inputs $out/nix-support/propagated-user-env-packages
               fi
 
+              ${optionalString (self.enableSharedExecutables && self.isExecutable && self.stdenv.isDarwin) ''
+                for exe in $out/bin/* ; do
+                  install_name_tool -add_rpath \
+                    $out/lib/${ghc.ghc.name}/${self.pname}-${self.version} $exe
+                done
+              ''}
+
               eval "$postInstall"
             '';