From 1164d5b4709c1116c67fcdd2646e82020ff536e1 Mon Sep 17 00:00:00 2001
From: Vicki Pfau <vi@endrift.com>
Date: Thu, 9 Feb 2023 00:17:55 -0800
Subject: [PATCH] Qt: Disable attempted linking betwen incompatible platforms
 (fixes #2702)

---
 CHANGES                                   | 1 +
 src/platform/qt/MultiplayerController.cpp | 3 +++
 src/platform/qt/MultiplayerController.h   | 3 +++
 3 files changed, 7 insertions(+)

diff --git a/CHANGES b/CHANGES
index a507010c2..f99a6a9cb 100644
--- a/CHANGES
+++ b/CHANGES
@@ -11,6 +11,7 @@ Other fixes:
  - Qt: Fix crash when attempting to use OpenGL 2.1 to 3.1 (fixes mgba.io/i/2794)
  - Qt: Disable sync while running scripts from main thread (fixes mgba.io/i/2738)
  - Qt: Properly cap number of attached players by platform (fixes mgba.io/i/2807)
+ - Qt: Disable attempted linking betwen incompatible platforms (fixes mgba.io/i/2702)
 Misc:
  - Qt: Include wayland QPA in AppImage (fixes mgba.io/i/2796)
  - Qt: Stop eating boolean action key events (fixes mgba.io/i/2636)
diff --git a/src/platform/qt/MultiplayerController.cpp b/src/platform/qt/MultiplayerController.cpp
index a45f287a9..618efd1f6 100644
--- a/src/platform/qt/MultiplayerController.cpp
+++ b/src/platform/qt/MultiplayerController.cpp
@@ -229,6 +229,9 @@ bool MultiplayerController::attachGame(CoreController* controller) {
 		default:
 			return false;
 		}
+		m_platform = controller->platform();
+	} else if (controller->platform() != m_platform) {
+		return false;
 	}
 
 	mCoreThread* thread = controller->thread();
diff --git a/src/platform/qt/MultiplayerController.h b/src/platform/qt/MultiplayerController.h
index 5ad6124db..35cae13bb 100644
--- a/src/platform/qt/MultiplayerController.h
+++ b/src/platform/qt/MultiplayerController.h
@@ -9,6 +9,7 @@
 #include <QMutex>
 #include <QObject>
 
+#include <mgba/core/core.h>
 #include <mgba/core/lockstep.h>
 #ifdef M_CORE_GBA
 #include <mgba/internal/gba/sio/lockstep.h>
@@ -77,6 +78,8 @@ private:
 		GBASIOLockstep m_gbaLockstep;
 #endif
 	};
+
+	mPlatform m_platform = mPLATFORM_NONE;
 	QList<Player> m_players;
 	QMutex m_lock;
 };