Merge pull request #21720 from compnerd/trivial-property-descriptors

Author: swift-ci

lib/IRGen/GenKeyPath.cpp

@@ -1269,14 +1269,18 @@ void IRGenModule::emitSILProperty(SILProperty *prop) {
       var->setConstant(true);
       var->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
       var->setAlignment(4);
-      
+
       TheTrivialPropertyDescriptor = var;
     } else {
       auto entity = LinkEntity::forPropertyDescriptor(prop->getDecl());
       auto linkInfo = LinkInfo::get(*this, entity, ForDefinition);
-      llvm::GlobalAlias::create(linkInfo.getLinkage(),
-                                linkInfo.getName(),
-                                TheTrivialPropertyDescriptor);
+      auto *GA = llvm::GlobalAlias::create(linkInfo.getLinkage(),
+                                           linkInfo.getName(),
+                                           TheTrivialPropertyDescriptor);
+      ApplyIRLinkage({linkInfo.getLinkage(),
+                      linkInfo.getVisibility(),
+                      llvm::GlobalValue::DLLExportStorageClass})
+          .to(GA);
     }
     return;
   }

test/IRGen/trivial-property-descriptors.swift

@@ -0,0 +1,10 @@
+// RUN: %swift -target x86_64-unknown-windows-msvc -parse-stdlib -module-name Swift -enable-resilience -S -emit-ir -o - %s | %FileCheck %s
+
+public struct S {}
+extension S {
+  public var i: () { return () }
+  public var j: () { return () }
+}
+
+// CHECK: @"$ss1SV1jytvpMV" = dllexport alias { i32 }, { i32 }* @"$ss1SV1iytvpMV"
+