From d1dd6fa8287734864bf83cf4189aeb837ea84ca3 Mon Sep 17 00:00:00 2001
From: Rodney Lorrimar <rodney.lorrimar@iohk.io>
Date: Wed, 5 Sep 2018 22:16:57 +1000
Subject: [PATCH 1/2] [DEVOPS-1032] nix: allow building without optimization

Used like this:

    nix-build --arg fasterBuild true -A cardano-sl-wallet-new
---
 default.nix | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/default.nix b/default.nix
index e539bd5ea3c..9977903a8a6 100644
--- a/default.nix
+++ b/default.nix
@@ -22,6 +22,7 @@ in
 , enablePhaseMetrics ? true
 , allowCustomConfig ? true
 , useStackBinaries ? false
+, fasterBuild ? false
 }:
 
 with pkgs.lib;
@@ -111,6 +112,14 @@ let
     });
   };
 
+  # Disabling optimization for cardano-sl packages will
+  # return a build ~20% faster (measured in DEVOPS-1032).
+  fasterBuildOverlay = self: super: {
+    mkDerivation = args: super.mkDerivation (args // optionalAttrs (localLib.isCardanoSL args.pname) {
+      configureFlags = (args.configureFlags or []) ++ [ "--ghc-options=-O0" ];
+    });
+  };
+
   dontCheckOverlay = self: super: {
     mkDerivation = args: super.mkDerivation (args // {
       doCheck = false;
@@ -133,7 +142,8 @@ let
       ++ optional enablePhaseMetrics metricOverlay
       ++ optional enableBenchmarks benchmarkOverlay
       ++ optional enableDebugging debugOverlay
-      ++ optional forceDontCheck dontCheckOverlay;
+      ++ optional forceDontCheck dontCheckOverlay
+      ++ optional fasterBuild fasterBuildOverlay;
 
   cardanoPkgs = builtins.foldl' (pkgs: overlay: pkgs.extend overlay) cardanoPkgsBase activeOverlays;
   connect = let

From ed4793f2242f6976b2cef2ba9acbf64979097582 Mon Sep 17 00:00:00 2001
From: Rodney Lorrimar <rodney.lorrimar@iohk.io>
Date: Tue, 11 Sep 2018 10:31:46 +1000
Subject: [PATCH 2/2] [DEVOPS-1032] release.nix: pass through fasterBuild arg

---
 release.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/release.nix b/release.nix
index 3e5dd514b74..c2c4ccf1590 100644
--- a/release.nix
+++ b/release.nix
@@ -4,9 +4,11 @@ in
   { supportedSystems ? [ "x86_64-linux" "x86_64-darwin" ]
   , scrubJobs ? true
   , cardano ? { outPath = ./.; rev = "abcdef"; }
+  , fasterBuild ? false
   , nixpkgsArgs ? {
       config = { allowUnfree = false; inHydra = true; };
       gitrev = cardano.rev;
+      inherit fasterBuild;
     }
   }: