[PATCH] D37206: [ItaniumCXXABI] Always use linkonce_odr linkage for RTTI data on MinGW

[Martin Storsjö via Phabricator via cfe-commits]

mstorsjo updated this revision to Diff 113309.
mstorsjo added a comment.

The previous diff lacked the extra context around the diff - fixed.


https://reviews.llvm.org/D37206

Files:
  lib/CodeGen/ItaniumCXXABI.cpp
  test/CodeGenCXX/rtti-mingw64.cpp


Index: test/CodeGenCXX/rtti-mingw64.cpp
===================================================================
--- test/CodeGenCXX/rtti-mingw64.cpp
+++ test/CodeGenCXX/rtti-mingw64.cpp
@@ -2,7 +2,12 @@
 struct A { int a; };
 struct B : virtual A { int b; };
 B b;
+class C {
+  virtual ~C();
+};
+C::~C() {}
 
+// CHECK: @_ZTI1C = linkonce_odr
 // CHECK: @_ZTI1B = linkonce_odr constant { i8*, i8*, i32, i32, i8*, i64 }
 // CHECK-SAME:  i8* bitcast (i8** getelementptr inbounds (i8*, i8** @_ZTVN10__cxxabiv121__vmi_class_type_infoE, i64 2) to i8*),
 // CHECK-SAME:  i8* getelementptr inbounds ([3 x i8], [3 x i8]* @_ZTS1B, i32 0, i32 0),
Index: lib/CodeGen/ItaniumCXXABI.cpp
===================================================================
--- lib/CodeGen/ItaniumCXXABI.cpp
+++ lib/CodeGen/ItaniumCXXABI.cpp
@@ -2987,15 +2987,13 @@
         if (RD->hasAttr<DLLImportAttr>() &&
             ShouldUseExternalRTTIDescriptor(CGM, Ty))
           return llvm::GlobalValue::ExternalLinkage;
-      if (RD->isDynamicClass()) {
-        llvm::GlobalValue::LinkageTypes LT = CGM.getVTableLinkage(RD);
-        // MinGW won't export the RTTI information when there is a key function.
-        // Make sure we emit our own copy instead of attempting to dllimport it.
-        if (RD->hasAttr<DLLImportAttr>() &&
-            llvm::GlobalValue::isAvailableExternallyLinkage(LT))
-          LT = llvm::GlobalValue::LinkOnceODRLinkage;
-        return LT;
-      }
+      bool IsMinGW =
+          CGM.getContext().getTargetInfo().getTriple().getEnvironment() ==
+              llvm::Triple::GNU &&
+          CGM.getContext().getTargetInfo().getTriple().isOSWindows();
+      // MinGW always uses LinkOnceODRLinkage for type info.
+      if (RD->isDynamicClass() && !IsMinGW)
+        return CGM.getVTableLinkage(RD);
     }
 
     return llvm::GlobalValue::LinkOnceODRLinkage;


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