From e42d10957d87a5837085cd3273f97e50b67e987d Mon Sep 17 00:00:00 2001
From: David Johnson <djohnson.m@gmail.com>
Date: Mon, 3 Dec 2018 13:46:22 -0500
Subject: [PATCH] Add disable core optimizations (#51464)

haskell.lib.disableOptimization: new function

Adds a utility function for disabling GHC core optimizations.
Significantly reduces build times.
---
 pkgs/development/haskell-modules/lib.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/development/haskell-modules/lib.nix b/pkgs/development/haskell-modules/lib.nix
index 3d67ac213993..e3b73641989a 100644
--- a/pkgs/development/haskell-modules/lib.nix
+++ b/pkgs/development/haskell-modules/lib.nix
@@ -259,6 +259,9 @@ rec {
    */
   buildStrictly = pkg: buildFromSdist (failOnAllWarnings pkg);
 
+  /* Disable core optimizations, significantly speeds up build time */
+  disableOptimization = pkg: appendConfigureFlag pkg "--disable-optimization";
+
   /* Turn on most of the compiler warnings and fail the build if any
      of them occur. */
   failOnAllWarnings = drv: appendConfigureFlag drv "--ghc-option=-Wall --ghc-option=-Werror";