From d7702e0dbab81a24c27b57d26ddb613f6d451749 Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Wed, 30 Sep 2020 10:50:24 +0200
Subject: [PATCH] Configure the Haskell package set for ghc-9.0.x.

---
 .../configuration-ghc-9.0.x.nix               | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 pkgs/development/haskell-modules/configuration-ghc-9.0.x.nix

diff --git a/pkgs/development/haskell-modules/configuration-ghc-9.0.x.nix b/pkgs/development/haskell-modules/configuration-ghc-9.0.x.nix
new file mode 100644
index 00000000000..2a3a0b3bc14
--- /dev/null
+++ b/pkgs/development/haskell-modules/configuration-ghc-9.0.x.nix
@@ -0,0 +1,46 @@
+{ pkgs, haskellLib }:
+
+with haskellLib;
+
+self: super: {
+
+  # This compiler version needs llvm 10.x.
+  llvmPackages = pkgs.llvmPackages_10;
+
+  # Disable GHC 9.0.x core libraries.
+  array = null;
+  base = null;
+  binary = null;
+  bytestring = null;
+  Cabal = null;
+  containers = null;
+  deepseq = null;
+  directory = null;
+  exceptions = null;
+  filepath = null;
+  ghc-bignum = null;
+  ghc-boot = null;
+  ghc-boot-th = null;
+  ghc-compact = null;
+  ghc-heap = null;
+  ghc-prim = null;
+  ghci = null;
+  haskeline = null;
+  hpc = null;
+  integer-gmp = null;
+  libiserv = null;
+  mtl = null;
+  parsec = null;
+  pretty = null;
+  process = null;
+  rts = null;
+  stm = null;
+  template-haskell = null;
+  terminfo = null;
+  text = null;
+  time = null;
+  transformers = null;
+  unix = null;
+  xhtml = null;
+
+}