From c6d9b5d96aa14855e200f5030c22a17a74559c02 Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Fri, 10 Nov 2017 19:26:24 +0100
Subject: [PATCH] haskell-c2hs: use development version from github to work
 around _Float128 bug

Works around https://github.com/haskell/c2hs/issues/192.
Closes https://github.com/NixOS/nixpkgs/issues/31411.
Closes https://github.com/NixOS/nixpkgs/pull/31498.
---
 .../haskell-modules/configuration-common.nix     | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index 27bf4012a78..5203a7c7618 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -65,9 +65,6 @@ self: super: {
   options = dontCheck super.options;
   statistics = dontCheck super.statistics;
 
-  # segfault due to missing return: https://github.com/haskell/c2hs/pull/184
-  c2hs = dontCheck super.c2hs;
-
   # https://github.com/gilith/hol/pull/1
   hol = appendPatch (doJailbreak super.hol) (pkgs.fetchpatch {
     name = "hol.patch";
@@ -978,4 +975,17 @@ self: super: {
 
   # missing dependencies: Glob >=0.7.14 && <0.8, data-fix ==0.0.4
   stack2nix = doJailbreak super.stack2nix;
+
+  # Hacks to work around https://github.com/haskell/c2hs/issues/192.
+  c2hs = (overrideCabal super.c2hs {
+    version = "0.26.2-28-g8b79823";
+    doCheck = false;
+    src = pkgs.fetchFromGitHub {
+      owner = "deech";
+      repo = "c2hs";
+      rev = "8b79823c32e234c161baec67fdf7907952ca62b8";
+      sha256 = "0hyrcyssclkdfcw2kgcark8jl869snwnbrhr9k0a9sbpk72wp7nz";
+    };
+  }).override { language-c = self.language-c_0_7_0; };
+
 }