From c88a8f96b478cc92623853b2bb26818b888e311a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9mi=20Verschelde?= <rverschelde@gmail.com>
Date: Tue, 5 Sep 2023 14:56:53 +0200
Subject: [PATCH] Web: Workaround Emscripten 3.1.42+ LTO regression

Fixes #80010.

(cherry picked from commit b064008c07be856d6f3a5079d11746137e03ede5)
---
 .github/workflows/javascript_builds.yml | 4 ++--
 platform/javascript/detect.py           | 4 ++++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/javascript_builds.yml b/.github/workflows/javascript_builds.yml
index 5bed2812149..bc1237ace64 100644
--- a/.github/workflows/javascript_builds.yml
+++ b/.github/workflows/javascript_builds.yml
@@ -7,7 +7,7 @@ env:
   # Only used for the cache key. Increment version to force clean build.
   GODOT_BASE_BRANCH: 3.x
   SCONSFLAGS: verbose=yes warnings=all werror=yes debug_symbols=no
-  EM_VERSION: 3.1.18
+  EM_VERSION: 3.1.45
   EM_CACHE_FOLDER: "emsdk-cache"
 
 concurrency:
@@ -16,7 +16,7 @@ concurrency:
 
 jobs:
   javascript-template:
-    runs-on: "ubuntu-20.04"
+    runs-on: "ubuntu-22.04"
     name: Template (target=release, tools=no)
 
     steps:
diff --git a/platform/javascript/detect.py b/platform/javascript/detect.py
index b32133e3326..046f0c53e11 100644
--- a/platform/javascript/detect.py
+++ b/platform/javascript/detect.py
@@ -111,6 +111,10 @@ def configure(env):
         else:
             env.Append(CCFLAGS=["-flto"])
             env.Append(LINKFLAGS=["-flto"])
+        # Workaround https://github.com/emscripten-core/emscripten/issues/19781.
+        cc_semver = tuple(get_compiler_version(env))
+        if cc_semver >= (3, 1, 42):
+            env.Append(LINKFLAGS=["-Wl,-u,scalbnf"])
 
     # Sanitizers
     if env["use_ubsan"]: