From 9cd313ee58ce2c5d34d6ca96ef700463876c8729 Mon Sep 17 00:00:00 2001
From: Hamish Mackenzie <Hamish.K.Mackenzie@gmail.com>
Date: Thu, 16 Mar 2023 23:14:06 +1300
Subject: [PATCH] Set EM_CACHE for emscripten

---
 compiler/ghc/default.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/compiler/ghc/default.nix b/compiler/ghc/default.nix
index 7ebbaf8448..7167f10e03 100644
--- a/compiler/ghc/default.nix
+++ b/compiler/ghc/default.nix
@@ -296,6 +296,7 @@ stdenv.mkDerivation (rec {
         export CC="${targetCC}/bin/emcc"
         export CXX="${targetCC}/bin/em++"
         export LD="${targetCC}/bin/emcc"
+        export EM_CACHE=$(mktemp -d)
     ''
     # GHC is a bit confused on its cross terminology, as these would normally be
     # the *host* tools.