From da170e7e8e6a21278641b0db18955be93dba6d9a Mon Sep 17 00:00:00 2001
From: Doug Gregor <dgregor@apple.com>
Date: Tue, 19 May 2026 16:04:32 -0700
Subject: [PATCH] [Embedded] Only emit global variables from another module if
 they are @used

---
 lib/IRGen/GenDecl.cpp | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/lib/IRGen/GenDecl.cpp b/lib/IRGen/GenDecl.cpp
index d3a8bd179f8..d7128d2c91b 100644
--- a/lib/IRGen/GenDecl.cpp
+++ b/lib/IRGen/GenDecl.cpp
@@ -1169,11 +1169,10 @@ static bool isLazilyEmittedFunction(SILFunction &f, SILModule &m) {
 // Eagerly emit global variables that are externally visible.
 static bool isLazilyEmittedGlobalVariable(SILGlobalVariable &v, SILModule &m) {
   if (v.isPossiblyUsedExternally()) {
-    // Under the embedded linkage model, if it has a non-unique definition,
-    // treat it lazily.
-    if (v.hasNonUniqueDefinition() && !v.markedAsUsed()) {
+    // Globals that come from a different module will be lazily emitted unless
+    // explicitly marked @used.
+    if (v.getParentModule() != m.getSwiftModule() && !v.markedAsUsed())
       return true;
-    }
 
     return false;
   }