shell.nix: optional profiling

Run with `nix-shell -A env --arg profiling true` to enable profiling.
nix-community · Apr 5, 2016 · 201f59f · 201f59f
1 parent c77576f
commit 201f59f
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Showing 2 changed files with 9 additions and 11 deletions.
diff --git a/shell-profiling.nix b/shell-profiling.nix
diff --git a/shell.nix b/shell.nix
@@ -1,8 +1,16 @@
-with (import <nixpkgs> {});
+{ nixpkgs ? import <nixpkgs> {}, profiling ? false }:
+
+with nixpkgs;
+
 let
   inherit (pkgs.haskell) lib;
   haskellPackages = pkgs.haskell.packages.ghc7103.override {
     overrides = self: super: {
+
+      mkDerivation = args: super.mkDerivation (args // {
+        enableLibraryProfiling = profiling;
+      });
+
       aeson = self.aeson_0_11_1_4;
       bifunctors = lib.dontHaddock self.bifunctors_5_2_1;
       comonad = lib.doJailbreak (lib.dontCheck super.comonad);