From 16daea3622468abf68a4f0ec22de0a46d57f17ed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9mi=20Verschelde?= <remi@godotengine.org>
Date: Sat, 10 Jan 2026 23:06:21 +0100
Subject: [PATCH] BasisUniversal: Disable strict aliasing to fix GCC
 optimization issue

This is flagged by upstream as something important in `basisu.h`.
And indeed, we've now seen why with a regression appearing with mingw-gcc 15.

Fixes #114803.
---
 modules/basis_universal/SCsub | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/modules/basis_universal/SCsub b/modules/basis_universal/SCsub
index 2963babd253..381227228ed 100644
--- a/modules/basis_universal/SCsub
+++ b/modules/basis_universal/SCsub
@@ -56,6 +56,10 @@ if env["builtin_zstd"]:
 env_thirdparty = env_basisu.Clone()
 env_thirdparty.disable_warnings()
 
+if not env.msvc:
+    # Required by upstream for GCC. Enabling also for LLVM-based compilers to be consistent.
+    env_thirdparty.Append(CCFLAGS=["-fno-strict-aliasing"])
+
 # Disable unneeded features to reduce binary size.
 # <https://github.com/BinomialLLC/basis_universal/wiki/How-to-Use-and-Configure-the-Transcoder>
 env_thirdparty.Append(