CodeGen: Compiler generated __declspec(uuid) objects should be COMDAT'd

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@226628 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index 7845fba23052d42b3afd867f9b5abdd26b5fa7e7..6611a71104388ddad61f1c25163d885423899593 100644 (file)
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -1274,6 +1274,8 @@ llvm::Constant *CodeGenModule::GetAddrOfUuidDescriptor(
   auto *GV = new llvm::GlobalVariable(
       getModule(), Init->getType(),
       /*isConstant=*/true, llvm::GlobalValue::LinkOnceODRLinkage, Init, Name);
+  if (supportsCOMDAT())
+    GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
   return GV;
 }
 

diff --git a/test/CodeGenCXX/microsoft-uuidof.cpp b/test/CodeGenCXX/microsoft-uuidof.cpp
index d57ca8380e39f9f447826d4bb9b9ff8714b3571b..2ac5f1b0799902476c63194c4d3e6da5ba2f99ff 100644 (file)
--- a/test/CodeGenCXX/microsoft-uuidof.cpp
+++ b/test/CodeGenCXX/microsoft-uuidof.cpp
@@ -19,6 +19,7 @@ typedef struct _GUID GUID;
 struct __declspec(uuid("12345678-1234-1234-1234-1234567890aB")) S1 { } s1;
 struct __declspec(uuid("87654321-4321-4321-4321-ba0987654321")) S2 { };
 struct __declspec(uuid("{12345678-1234-1234-1234-1234567890ac}")) Curly;
+struct __declspec(uuid("{12345678-1234-1234-1234-1234567890ac}")) Curly;
 
 #ifdef DEFINE_GUID
 // Make sure we can properly generate code when the UUID has curly braces on it.
@@ -33,7 +34,7 @@ GUID g = __uuidof(S1);
 #endif
 
 // First global use of __uuidof(S1) forces the creation of the global.
-// CHECK: @_GUID_12345678_1234_1234_1234_1234567890ab = linkonce_odr constant { i32, i16, i16, [8 x i8] } { i32 305419896, i16 4660, i16 4660, [8 x i8] c"\124\124Vx\90\AB" }
+// CHECK: @_GUID_12345678_1234_1234_1234_1234567890ab = linkonce_odr constant { i32, i16, i16, [8 x i8] } { i32 305419896, i16 4660, i16 4660, [8 x i8] c"\124\124Vx\90\AB" }, comdat
 // CHECK: @gr = constant %struct._GUID* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab to %struct._GUID*), align 4
 const GUID& gr = __uuidof(S1);
 
@@ -49,7 +50,7 @@ const GUID& zeroiid = __uuidof(0);
 
 // __uuidof(S2) hasn't been used globally yet, so it's emitted when it's used
 // in a function and is emitted at the end of the globals section.
-// CHECK: @_GUID_87654321_4321_4321_4321_ba0987654321 = linkonce_odr constant { i32, i16, i16, [8 x i8] } { i32 -2023406815, i16 17185, i16 17185, [8 x i8] c"C!\BA\09\87eC!" }
+// CHECK: @_GUID_87654321_4321_4321_4321_ba0987654321 = linkonce_odr constant { i32, i16, i16, [8 x i8] } { i32 -2023406815, i16 17185, i16 17185, [8 x i8] c"C!\BA\09\87eC!" }, comdat
 
 // The static initializer for thing.
 // CHECK-DEFINE-GUID: call void @llvm.memcpy.p0i8.p0i8.i32(i8* bitcast (%struct._GUID* @thing to i8*), i8* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ac to i8*), i32 16, i32 4, i1 false)