From 75c0461123248c0b17f049d878507e51769b07b6 Mon Sep 17 00:00:00 2001
From: Moonchild <moonchild@palemoon.org>
Date: Fri, 23 May 2025 00:56:19 +0200
Subject: [PATCH] No issue - Force C++ run-time type information on protobuf

Protobuf uses `dynamic_cast` on polymorphic types which cannot be
inferred properly at compile-time, which can lead to unexpected behavior.
As a code safety measure, enable C++ RTTI for protobuf.
---
 toolkit/components/protobuf/moz.build | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/toolkit/components/protobuf/moz.build b/toolkit/components/protobuf/moz.build
index 41c6f3d75e..633bb76585 100644
--- a/toolkit/components/protobuf/moz.build
+++ b/toolkit/components/protobuf/moz.build
@@ -130,6 +130,11 @@ elif CONFIG['_MSC_VER']:
         '-wd4099', # mismatched class/struct tags
     ]
 
+if CONFIG['_MSC_VER']:
+    CXXFLAGS += [
+        '-GR', # protobuf uses dynamic_cast on polymorphic types
+    ]
+
 if CONFIG['MOZ_USE_PTHREADS']:
     DEFINES['HAVE_PTHREAD'] = True