[Fix] (MobileGL/Init, MG_Backend): ShutdownSplitRoles exists only under MOBILEGL_BUILD_DISAGGREGATED - G1 admits no new pull symbol and the unconditional call moved DestroyImpl by 32 bytes

MobileGL/Init.cpp

@@ -43,11 +43,15 @@ namespace MobileGL {
             if (logLifecycle) {
                 MGLOG_I("MobileGL closing...");
             }
+#if MOBILEGL_BUILD_DISAGGREGATED
             // P5: the split roles come down FIRST - ARCHITECTURE.md:537's order puts the whole
             // of it before MobileGL::Destroy(), and this function IS MobileGL::Destroy. A no-op
-            // in a monolith build and in a monolith run; see BackendObjects.h for why the
-            // position rather than the call is the load-bearing part.
+            // in a monolith RUN; absent from a monolith BUILD, because G1 admits no new pull
+            // symbol and no resized one (the first version called it unconditionally and moved
+            // DestroyImpl by 32 bytes). See BackendObjects.h for why the position rather than
+            // the call is the load-bearing part.
             MG_Backend::ShutdownSplitRoles();
+#endif
             // Before any subsystem the counters name goes away, and before the last frame's
             // numbers can be lost: emits the final summary line and, when
             // MOBILEGL_PIPE_STATS_FILE is set, the JSON dump. A no-op when the counters are

MobileGL/MG_Backend/BackendObjects.h

@@ -16,9 +16,10 @@ namespace MobileGL::MG_Backend {
     extern UniquePtr<BackendObject>& pActiveBackendObject;
     extern GlobalBackendFunctionsTable gBackendFunctionsTable;
 
-    // P5 v1. The counterpart of Init()'s single split hook, and a NO-OP in every build and
-    // every run that is not split - which is why MobileGL/Init.cpp can call it unconditionally
-    // without a second #if in a file no package owns.
+#if MOBILEGL_BUILD_DISAGGREGATED
+    // P5 v1. The counterpart of Init()'s single split hook, and a NO-OP in every run that is
+    // not split. It exists ONLY in a split build: G1 admits no new symbol in the pull build,
+    // so MobileGL/Init.cpp's call sits under the same #if rather than calling a no-op.
     //
     // IT MUST RUN FIRST, BEFORE ANYTHING ELSE IN DestroyImpl. ARCHITECTURE.md:537's order is
     // publish -> the server drains and acks -> stop the apply thread (Kill, then join) -> close
@@ -38,4 +39,5 @@ namespace MobileGL::MG_Backend {
     // client-minted and needs no backend call, which is P10's. CONTRACT-P5 4 flags this as a
     // KNOWN OPEN ITEM and asks v1 to record which way it went: P5 keeps today's order.
     void ShutdownSplitRoles();
+#endif
 } // namespace MobileGL::MG_Backend

MobileGL/MG_Backend/Init.cpp

@@ -170,8 +170,8 @@ namespace MobileGL::MG_Backend {
     } // namespace
 #endif
 
-    void ShutdownSplitRoles() {
 #if MOBILEGL_BUILD_DISAGGREGATED
+    void ShutdownSplitRoles() {
         if (MG_Config::Transport == MG_Config::TransportMode::Monolith) return;
         // ClientSession::Stop IS table 3's whole order and it is idempotent: publish and wait
         // for the server to drain (bounded - a lost record must be a red lane, not a hung
@@ -181,8 +181,8 @@ namespace MobileGL::MG_Backend {
         // owns. A var-tail still named by an unapplied record is a use-after-free the join is
         // what prevents, which is why the order is not a preference.
         MG_Remote::Client::ClientSessionInstance().Stop();
-#endif
     }
+#endif
 
     void Init() {
         MGLOG_D("Initializing MobileGL Backend...");