From f911edaf43e08495ef983b4a4eea57a28774fc7e Mon Sep 17 00:00:00 2001
From: Will Dietz <w@wdtz.org>
Date: Wed, 14 Mar 2018 15:35:24 -0500
Subject: llvm6: Build with support for the experimental WASM backend

---
 pkgs/development/compilers/llvm/6/llvm.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/compilers/llvm/6/llvm.nix b/pkgs/development/compilers/llvm/6/llvm.nix
index 4f7a2835cc93..256b9120c826 100644
--- a/pkgs/development/compilers/llvm/6/llvm.nix
+++ b/pkgs/development/compilers/llvm/6/llvm.nix
@@ -16,6 +16,7 @@
 , debugVersion ? false
 , enableManpages ? false
 , enableSharedLibraries ? true
+, enableWasm ? true
 , darwin
 }:
 
@@ -115,7 +116,9 @@ in stdenv.mkDerivation (rec {
 
     "-DCOMPILER_RT_BUILD_SANITIZERS=OFF"
     "-DCOMPILER_RT_BUILD_XRAY=OFF"
-  ];
+  ] ++ stdenv.lib.optional enableWasm
+   "-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly"
+  ;
 
   postBuild = ''
     rm -fR $out
-- 
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