[clang] [clang codegen][regression] Add dso_local/hidden/etc. markings to VTT definitions and declarations (PR #72452)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: bd1976bris (bd1976bris)

<details>
<summary>Changes</summary>

https://reviews.llvm.org/D128482 regressed certain cases of VTT emission which are no longer hidden with -fvisibility=hidden.

Fix this regression by marking both declarations and definitions.

Fixes [clang codegen][regression] VTT definitions missing dso_local/hidden/etc markings #<!-- -->72451

---
Full diff: https://github.com/llvm/llvm-project/pull/72452.diff


2 Files Affected:

- (modified) clang/lib/CodeGen/CGVTT.cpp (+3) 
- (modified) clang/test/CodeGenCXX/visibility.cpp (+3) 


``````````diff
diff --git a/clang/lib/CodeGen/CGVTT.cpp b/clang/lib/CodeGen/CGVTT.cpp
index 22790147c6f5a9f..0eab677ca68a85a 100644
--- a/clang/lib/CodeGen/CGVTT.cpp
+++ b/clang/lib/CodeGen/CGVTT.cpp
@@ -93,6 +93,9 @@ CodeGenVTables::EmitVTTDefinition(llvm::GlobalVariable *VTT,
 
   if (CGM.supportsCOMDAT() && VTT->isWeakForLinker())
     VTT->setComdat(CGM.getModule().getOrInsertComdat(VTT->getName()));
+
+  // Set the right visibility.
+  CGM.setGVProperties(VTT, RD);
 }
 
 llvm::GlobalVariable *CodeGenVTables::GetAddrOfVTT(const CXXRecordDecl *RD) {
diff --git a/clang/test/CodeGenCXX/visibility.cpp b/clang/test/CodeGenCXX/visibility.cpp
index b017bc8b52d5a5d..d94303c90f300b4 100644
--- a/clang/test/CodeGenCXX/visibility.cpp
+++ b/clang/test/CodeGenCXX/visibility.cpp
@@ -206,6 +206,9 @@ namespace test27 {
 // CHECK: @_ZGVZN6test681fC1EvE4test = linkonce_odr global
 // CHECK-HIDDEN: @_ZGVZN6test681fC1EvE4test = linkonce_odr hidden global
 
+// CHECK-HIDDEN: @_ZTVN6test701DE = linkonce_odr hidden unnamed_addr constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr null, ptr @_ZTIN6test701DE] }, align 8
+// CHECK-HIDDEN: @_ZTTN6test701DE = linkonce_odr hidden unnamed_addr constant [1 x ptr] [ptr getelementptr inbounds ({ [3 x ptr] }, ptr @_ZTVN6test701DE, i32 0, inrange i32 0, i32 3)], align 8
+
 // CHECK: @_ZZN6Test193fooIiEEvvE1a = linkonce_odr global
 // CHECK-HIDDEN: @_ZZN6Test193fooIiEEvvE1a = linkonce_odr hidden global
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/72452