From a008c419ddc08a5b07dc56cb4f23236e0916cf65 Mon Sep 17 00:00:00 2001
From: sternenseemann <0rpkxez4ksa01gb3typccl0i@systemli.org>
Date: Sat, 28 Aug 2021 14:30:25 +0200
Subject: [PATCH] haskell.compiler.ghc921: provide xattr on darwin

GHC 9.2.1-rc1 needs to run xattr in ghc.mk unconditionally. The fix for
this and support for the XATTR environment variable have only been added
to the GHC 8.10 series so far.
---
 pkgs/development/compilers/ghc/9.2.1.nix | 6 +++++-
 pkgs/top-level/haskell-packages.nix      | 4 ++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/compilers/ghc/9.2.1.nix b/pkgs/development/compilers/ghc/9.2.1.nix
index 46bacd5df1a8..66cc4d6c322e 100644
--- a/pkgs/development/compilers/ghc/9.2.1.nix
+++ b/pkgs/development/compilers/ghc/9.2.1.nix
@@ -2,7 +2,7 @@
 
 # build-tools
 , bootPkgs
-, autoconf, automake, coreutils, fetchurl, perl, python3, m4, sphinx
+, autoconf, automake, coreutils, fetchurl, perl, python3, m4, sphinx, xattr
 , bash
 
 , libiconv ? null, ncurses
@@ -238,6 +238,10 @@ stdenv.mkDerivation (rec {
     ghc bootPkgs.alex bootPkgs.happy bootPkgs.hscolour
   ] ++ lib.optionals enableDocs [
     sphinx
+  ] ++ lib.optionals stdenv.isDarwin [
+    # TODO(@sternenseemann): use XATTR env var after backport of
+    # https://gitlab.haskell.org/ghc/ghc/-/merge_requests/6447
+    xattr
   ];
 
   # For building runtime libs
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 530c3c43f76a..a7fb4251f7ed 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -120,6 +120,10 @@ in {
         else
           packages.ghc8102Binary;
       inherit (buildPackages.python3Packages) sphinx;
+      # Need to use apple's patched xattr until
+      # https://github.com/xattr/xattr/issues/44 and
+      # https://github.com/xattr/xattr/issues/55 are solved.
+      inherit (buildPackages.darwin) xattr;
       buildLlvmPackages = buildPackages.llvmPackages_10;
       llvmPackages = pkgs.llvmPackages_10;
     };