From 44e5d446c4e37bcf2e04ca02ce6c0178930a6aff Mon Sep 17 00:00:00 2001
From: Leon Krause <lk@leonkrause.com>
Date: Mon, 29 Oct 2018 21:05:23 +0100
Subject: Enable --no-heap-copy flag for HTML5 builds

---
 platform/javascript/detect.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/platform/javascript/detect.py b/platform/javascript/detect.py
index 17b31f8d73..cf85c3df7f 100644
--- a/platform/javascript/detect.py
+++ b/platform/javascript/detect.py
@@ -128,6 +128,10 @@ def configure(env):
     # us since we don't know requirements at compile-time.
     env.Append(LINKFLAGS=['-s', 'ALLOW_MEMORY_GROWTH=1'])
 
+    # Since we use both memory growth and MEMFS preloading,
+    # this avoids unecessary copying on start-up.
+    env.Append(LINKFLAGS=['--no-heap-copy'])
+
     # This setting just makes WebGL 2 APIs available, it does NOT disable WebGL 1.
     env.Append(LINKFLAGS=['-s', 'USE_WEBGL2=1'])
 
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