diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 02030bd66..9808e9607 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -33,6 +33,14 @@ jobs:
       - name: Prepare
         run: cp -R /orig .
 
+      # Build and link non-matching files to verify lack of errors
+      - name: Build non-matching
+        run: |
+          python configure.py --non-matching \
+              --version ${{ matrix.version }} \
+              --binutils /binutils --compilers /compilers
+          ninja
+
       # Build the project
       - name: Build
         run: |
diff --git a/configure.py b/configure.py
index f68943d26..bbf728d9a 100644
--- a/configure.py
+++ b/configure.py
@@ -187,6 +187,7 @@
     "-enum int",
     "-fp hardware",
     "-Cpp_exceptions off",
+    "-W err",
     # "-W all",
     "-O4,p",
     "-inline auto",
diff --git a/src/SB/Core/gc/iTRC.cpp b/src/SB/Core/gc/iTRC.cpp
index a43f14bd2..6f5ae9d80 100644
--- a/src/SB/Core/gc/iTRC.cpp
+++ b/src/SB/Core/gc/iTRC.cpp
@@ -6,6 +6,17 @@
 namespace ResetButton
 {
     bool mResetEnabled = 1;
+    void (*mSndKill)();
+}
+
+namespace iTRCDisk
+{
+    void (*mSndSuspend)();
+    void (*mSndResume)();
+    void (*mPadStopRumbling)();
+    void (*mSndKill)();
+    void (*mMovieSuspendFunction)();
+    void (*mMovieResumeFunction)();
 }
 
 bool ROMFont::Init()
diff --git a/src/SB/Core/gc/iTRC.h b/src/SB/Core/gc/iTRC.h
index 2b430354f..a9f5a0dc3 100644
--- a/src/SB/Core/gc/iTRC.h
+++ b/src/SB/Core/gc/iTRC.h
@@ -29,12 +29,12 @@ namespace ROMFont
 namespace iTRCDisk
 {
     char mMessage[];
-    void (*mPadStopRumbling)();
-    void (*mSndSuspend)();
-    void (*mSndResume)();
-    void (*mSndKill)();
-    void (*mMovieSuspendFunction)();
-    void (*mMovieResumeFunction)();
+    extern void (*mSndSuspend)();
+    extern void (*mSndResume)();
+    extern void (*mPadStopRumbling)();
+    extern void (*mSndKill)();
+    extern void (*mMovieSuspendFunction)();
+    extern void (*mMovieResumeFunction)();
 
     void SetPadStopRumblingFunction(void (*)(void));
     void SetSndSuspendFunction(void (*)(void));
@@ -53,7 +53,7 @@ namespace iTRCDisk
 
 namespace ResetButton
 {
-    void (*mSndKill)();
+    extern void (*mSndKill)();
 
     void EnableReset();
     void DisableReset();
diff --git a/src/SB/Core/x/xBehaveMgr.h b/src/SB/Core/x/xBehaveMgr.h
index f68b8b913..c58dfd8f3 100644
--- a/src/SB/Core/x/xBehaveMgr.h
+++ b/src/SB/Core/x/xBehaveMgr.h
@@ -12,8 +12,14 @@ struct xBehaveMgr : RyzMemData
     xPsyche* psypool;
     st_XORDEREDARRAY psylist;
 
-    xBehaveMgr();
-    ~xBehaveMgr();
+    xBehaveMgr()
+    {
+    }
+
+    ~xBehaveMgr()
+    {
+    }
+
     void Startup(S32, S32);
     void RegBuiltIn();
     xPsyche* Subscribe(xBase* owner, S32 i);
@@ -22,9 +28,6 @@ struct xBehaveMgr : RyzMemData
     void SceneFinish();
     void SceneReset();
     xFactory* GetFactory();
-
-    void* operator new(size_t amt, U32, RyzMemGrow*);
-    void operator delete(void*, U16);
 };
 
 void xBehaveMgr_ScenePrepare();
diff --git a/src/SB/Game/zPlatform.cpp b/src/SB/Game/zPlatform.cpp
index d48680be3..4a14bc0e2 100644
--- a/src/SB/Game/zPlatform.cpp
+++ b/src/SB/Game/zPlatform.cpp
@@ -467,6 +467,7 @@ U32 zMechIsStartingBack(zPlatform* ent, U16 param_2)
 
 static F32 SolvePaddleMotion(zPlatform* plat, F32* time, F32 tmr)
 {
+    return 0.0f;
 }
 
 void zPlatform_PaddleStartRotate(xEnt* entplat, S32 direction, S32 stutter)