From e5dfcb5eddddab0ddcb698a972fb870432fc4364 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9mi=20Verschelde?= <rverschelde@gmail.com>
Date: Tue, 19 Nov 2019 09:44:04 +0100
Subject: [PATCH] HTML5: Explicitly link idbfs.js for IDBFS support

Upstream Emscripten changed this in 1.39.1+, so IDBFS is no longer
included by default and has to be linked manually.

The explicit linking doesn't seem to be problematic on earlier
versions (tested `1.38.47-upstream`).

Fixes #33724.
---
 platform/javascript/detect.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/platform/javascript/detect.py b/platform/javascript/detect.py
index 172072db3cf..a63fa900679 100644
--- a/platform/javascript/detect.py
+++ b/platform/javascript/detect.py
@@ -124,6 +124,10 @@ def configure(env):
 
     ## Link flags
 
+    # We use IDBFS in javascript_main.cpp. Since Emscripten 1.39.1 it needs to
+    # be linked explicitly.
+    env.Append(LIBS=['idbfs.js'])
+
     env.Append(LINKFLAGS=['-s', 'BINARYEN=1'])
 
     # Allow increasing memory buffer size during runtime. This is efficient