[ms][dll] #26935 Defining a dllimport function should cause it to be exported

If we have some function with dllimport attribute and then we have the function
definition in the same module but without dllimport attribute we should add
dllexport attribute to this function definition.
The same should be done for variables.

Example:
struct __declspec(dllimport) C3 {
  ~C3();
};
C3::~C3() {;} // we should export this definition.

Patch by Andrew V. Tischenko

Differential revision: http://reviews.llvm.org/D18953

llvm-svn: 270686

clang/include/clang/Basic/DiagnosticGroups.td

@@ -772,6 +772,7 @@ def MicrosoftEnumValue : DiagGroup<"microsoft-enum-value">;
 def MicrosoftDefaultArgRedefinition :
     DiagGroup<"microsoft-default-arg-redefinition">;
 def MicrosoftTemplate : DiagGroup<"microsoft-template">;
+def MicrosoftInconsistentDllImport : DiagGroup<"inconsistent-dllimport">;
 def MicrosoftRedeclareStatic : DiagGroup<"microsoft-redeclare-static">;
 def MicrosoftEnumForwardReference :
     DiagGroup<"microsoft-enum-forward-reference">;
@@ -798,7 +799,8 @@ def Microsoft : DiagGroup<"microsoft",
      MicrosoftRedeclareStatic, MicrosoftEnumForwardReference, MicrosoftGoto,
      MicrosoftFlexibleArray, MicrosoftExtraQualification, MicrosoftCast,
      MicrosoftConstInit, MicrosoftVoidPseudoDtor, MicrosoftAnonTag,
-     MicrosoftCommentPaste, MicrosoftEndOfFile]>;
+     MicrosoftCommentPaste, MicrosoftEndOfFile,
+     MicrosoftInconsistentDllImport]>;
 
 def ClangClPch : DiagGroup<"clang-cl-pch">;
 

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -2359,7 +2359,10 @@ def err_attribute_aligned_too_great : Error<
   "requested alignment must be %0 bytes or smaller">;
 def warn_redeclaration_without_attribute_prev_attribute_ignored : Warning<
   "%q0 redeclared without %1 attribute: previous %1 ignored">,
-  InGroup<DiagGroup<"inconsistent-dllimport">>;
+  InGroup<MicrosoftInconsistentDllImport>;
+def warn_redeclaration_without_import_attribute : Warning<
+  "%q0 redeclared without 'dllimport' attribute: 'dllexport' attribute added">,
+  InGroup<MicrosoftInconsistentDllImport>;
 def warn_dllimport_dropped_from_inline_function : Warning<
   "%q0 redeclared inline; %1 attribute ignored">,
   InGroup<IgnoredAttributes>;

clang/lib/Sema/SemaDecl.cpp

@@ -5559,9 +5559,13 @@ static void checkAttributesAfterMerging(Sema &S, NamedDecl &ND) {
 
 static void checkDLLAttributeRedeclaration(Sema &S, NamedDecl *OldDecl,
                                            NamedDecl *NewDecl,
-                                           bool IsSpecialization) {
+                                           bool IsSpecialization,
-  if (TemplateDecl *OldTD = dyn_cast<TemplateDecl>(OldDecl))
+                                           bool IsDefinition) {
+  if (TemplateDecl *OldTD = dyn_cast<TemplateDecl>(OldDecl)) {
     OldDecl = OldTD->getTemplatedDecl();
+    if (!IsSpecialization)
+      IsDefinition = false;
+  }
   if (TemplateDecl *NewTD = dyn_cast<TemplateDecl>(NewDecl))
     NewDecl = NewTD->getTemplatedDecl();
 
@@ -5617,14 +5621,17 @@ static void checkDLLAttributeRedeclaration(Sema &S, NamedDecl *OldDecl,
 
   // A redeclaration is not allowed to drop a dllimport attribute, the only
   // exceptions being inline function definitions, local extern declarations,
-  // and qualified friend declarations.
+  // qualified friend declarations or special MSVC extension: in the last case,
-  // NB: MSVC converts such a declaration to dllexport.
+  // the declaration is treated as if it were marked dllexport.
   bool IsInline = false, IsStaticDataMember = false, IsQualifiedFriend = false;
-  if (const auto *VD = dyn_cast<VarDecl>(NewDecl))
+  bool IsMicrosoft = S.Context.getTargetInfo().getCXXABI().isMicrosoft();
+  if (const auto *VD = dyn_cast<VarDecl>(NewDecl)) {
     // Ignore static data because out-of-line definitions are diagnosed
     // separately.
     IsStaticDataMember = VD->isStaticDataMember();
-  else if (const auto *FD = dyn_cast<FunctionDecl>(NewDecl)) {
+    IsDefinition = VD->isThisDeclarationADefinition(S.Context) !=
+                   VarDecl::DeclarationOnly;
+  } else if (const auto *FD = dyn_cast<FunctionDecl>(NewDecl)) {
     IsInline = FD->isInlined();
     IsQualifiedFriend = FD->getQualifier() &&
                         FD->getFriendObjectKind() == Decl::FOK_Declared;
@@ -5632,15 +5639,25 @@ static void checkDLLAttributeRedeclaration(Sema &S, NamedDecl *OldDecl,
 
   if (OldImportAttr && !HasNewAttr && !IsInline && !IsStaticDataMember &&
       !NewDecl->isLocalExternDecl() && !IsQualifiedFriend) {
-    S.Diag(NewDecl->getLocation(),
+    if (IsMicrosoft && IsDefinition) {
-           diag::warn_redeclaration_without_attribute_prev_attribute_ignored)
+      S.Diag(NewDecl->getLocation(),
-      << NewDecl << OldImportAttr;
+             diag::warn_redeclaration_without_import_attribute)
-    S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);
+          << NewDecl;
-    S.Diag(OldImportAttr->getLocation(), diag::note_previous_attribute);
+      S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);
-    OldDecl->dropAttr<DLLImportAttr>();
+      NewDecl->dropAttr<DLLImportAttr>();
-    NewDecl->dropAttr<DLLImportAttr>();
+      NewDecl->addAttr(::new (S.Context) DLLExportAttr(
-  } else if (IsInline && OldImportAttr &&
+          NewImportAttr->getRange(), S.Context,
-             !S.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
+          NewImportAttr->getSpellingListIndex()));
+    } else {
+      S.Diag(NewDecl->getLocation(),
+             diag::warn_redeclaration_without_attribute_prev_attribute_ignored)
+          << NewDecl << OldImportAttr;
+      S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);
+      S.Diag(OldImportAttr->getLocation(), diag::note_previous_attribute);
+      OldDecl->dropAttr<DLLImportAttr>();
+      NewDecl->dropAttr<DLLImportAttr>();
+    }
+  } else if (IsInline && OldImportAttr && !IsMicrosoft) {
     // In MinGW, seeing a function declared inline drops the dllimport attribute.
     OldDecl->dropAttr<DLLImportAttr>();
     NewDecl->dropAttr<DLLImportAttr>();
@@ -6424,7 +6441,7 @@ Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC,
   if (D.isRedeclaration() && !Previous.empty()) {
     checkDLLAttributeRedeclaration(
         *this, dyn_cast<NamedDecl>(Previous.getRepresentativeDecl()), NewVD,
-        IsExplicitSpecialization);
+        IsExplicitSpecialization, D.isFunctionDefinition());
   }
 
   if (NewTemplate) {
@@ -8455,7 +8472,8 @@ Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC,
   if (D.isRedeclaration() && !Previous.empty()) {
     checkDLLAttributeRedeclaration(
         *this, dyn_cast<NamedDecl>(Previous.getRepresentativeDecl()), NewFD,
-        isExplicitSpecialization || isFunctionTemplateSpecialization);
+        isExplicitSpecialization || isFunctionTemplateSpecialization,
+        D.isFunctionDefinition());
   }
 
   if (getLangOpts().CUDA) {

clang/test/CodeGen/dllimport.c

@@ -45,7 +45,8 @@ __declspec(dllimport) extern int GlobalRedecl3;
 USEVAR(GlobalRedecl3)
 
 // Make sure this works even if the decl has been used before it's defined (PR20792).
-// CHECK: @GlobalRedecl4 = common global i32
+// MS: @GlobalRedecl4 = common dllexport global i32
+// GNU: @GlobalRedecl4 = common global i32
 __declspec(dllimport) extern int GlobalRedecl4;
 USEVAR(GlobalRedecl4)
                       int GlobalRedecl4; // dllimport ignored
@@ -111,13 +112,15 @@ __declspec(dllimport) void redecl2(void);
                       void redecl2(void);
 USE(redecl2)
 
-// CHECK-DAG: define void @redecl3()
+// MS: define dllexport void @redecl3()
+// GNU: define void @redecl3()
 __declspec(dllimport) void redecl3(void);
                       void redecl3(void) {} // dllimport ignored
 USE(redecl3)
 
 // Make sure this works even if the decl is used before it's defined (PR20792).
-// CHECK-DAG: define void @redecl4()
+// MS: define dllexport void @redecl4()
+// GNU: define void @redecl4()
 __declspec(dllimport) void redecl4(void);
 USE(redecl4)
                       void redecl4(void) {} // dllimport ignored

clang/test/CodeGenCXX/dllimport-members.cpp

@@ -63,8 +63,8 @@ struct ForceNonTrivial {
 struct ImportMembers {
   struct Nested;
 
-  // M32-DAG: define              x86_thiscallcc void @"\01?normalDef@ImportMembers@@QAEXXZ"(%struct.ImportMembers* %this)
+  // M32-DAG: define  dllexport   x86_thiscallcc void @"\01?normalDef@ImportMembers@@QAEXXZ"(%struct.ImportMembers* %this)
-  // M64-DAG: define                             void @"\01?normalDef@ImportMembers@@QEAAXXZ"(%struct.ImportMembers* %this)
+  // M64-DAG: define  dllexport                  void @"\01?normalDef@ImportMembers@@QEAAXXZ"(%struct.ImportMembers* %this)
   // M32-DAG: declare dllimport   x86_thiscallcc void @"\01?normalDecl@ImportMembers@@QAEXXZ"(%struct.ImportMembers*)
   // M64-DAG: declare dllimport                  void @"\01?normalDecl@ImportMembers@@QEAAXXZ"(%struct.ImportMembers*)
   // M32-DAG: declare dllimport   x86_thiscallcc void @"\01?normalInclass@ImportMembers@@QAEXXZ"(%struct.ImportMembers*)
@@ -95,8 +95,8 @@ struct ImportMembers {
   __declspec(dllimport)                void normalInlineDef();
   __declspec(dllimport)         inline void normalInlineDecl();
 
-  // M32-DAG: define              x86_thiscallcc void @"\01?virtualDef@ImportMembers@@UAEXXZ"(%struct.ImportMembers* %this)
+  // M32-DAG: define  dllexport   x86_thiscallcc void @"\01?virtualDef@ImportMembers@@UAEXXZ"(%struct.ImportMembers* %this)
-  // M64-DAG: define                             void @"\01?virtualDef@ImportMembers@@UEAAXXZ"(%struct.ImportMembers* %this)
+  // M64-DAG: define  dllexport                  void @"\01?virtualDef@ImportMembers@@UEAAXXZ"(%struct.ImportMembers* %this)
   // M32-DAG: declare dllimport   x86_thiscallcc void @"\01?virtualDecl@ImportMembers@@UAEXXZ"(%struct.ImportMembers*)
   // M64-DAG: declare dllimport                  void @"\01?virtualDecl@ImportMembers@@UEAAXXZ"(%struct.ImportMembers*)
   // M32-DAG: declare dllimport   x86_thiscallcc void @"\01?virtualInclass@ImportMembers@@UAEXXZ"(%struct.ImportMembers*)
@@ -127,7 +127,7 @@ struct ImportMembers {
   __declspec(dllimport) virtual        void virtualInlineDef();
   __declspec(dllimport) virtual inline void virtualInlineDecl();
 
-  // MSC-DAG: define                           void @"\01?staticDef@ImportMembers@@SAXXZ"()
+  // MSC-DAG: define  dllexport                void @"\01?staticDef@ImportMembers@@SAXXZ"()
   // MSC-DAG: declare dllimport                void @"\01?staticDecl@ImportMembers@@SAXXZ"()
   // MSC-DAG: declare dllimport                void @"\01?staticInclass@ImportMembers@@SAXXZ"()
   // MSC-DAG: declare dllimport                void @"\01?staticInlineDef@ImportMembers@@SAXXZ"()
@@ -235,8 +235,8 @@ USEMV(ImportMembers, ConstexprField)
 
 // Import individual members of a nested class.
 struct ImportMembers::Nested {
-  // M32-DAG: define              x86_thiscallcc void @"\01?normalDef@Nested@ImportMembers@@QAEXXZ"(%"struct.ImportMembers::Nested"* %this)
+  // M32-DAG: define  dllexport   x86_thiscallcc void @"\01?normalDef@Nested@ImportMembers@@QAEXXZ"(%"struct.ImportMembers::Nested"* %this)
-  // M64-DAG: define                             void @"\01?normalDef@Nested@ImportMembers@@QEAAXXZ"(%"struct.ImportMembers::Nested"* %this)
+  // M64-DAG: define  dllexport                  void @"\01?normalDef@Nested@ImportMembers@@QEAAXXZ"(%"struct.ImportMembers::Nested"* %this)
   // M32-DAG: declare dllimport   x86_thiscallcc void @"\01?normalDecl@Nested@ImportMembers@@QAEXXZ"(%"struct.ImportMembers::Nested"*)
   // M64-DAG: declare dllimport                  void @"\01?normalDecl@Nested@ImportMembers@@QEAAXXZ"(%"struct.ImportMembers::Nested"*)
   // M32-DAG: declare dllimport   x86_thiscallcc void @"\01?normalInclass@Nested@ImportMembers@@QAEXXZ"(%"struct.ImportMembers::Nested"*)
@@ -267,8 +267,8 @@ struct ImportMembers::Nested {
   __declspec(dllimport)                void normalInlineDef();
   __declspec(dllimport)         inline void normalInlineDecl();
 
-  // M32-DAG: define              x86_thiscallcc void @"\01?virtualDef@Nested@ImportMembers@@UAEXXZ"(%"struct.ImportMembers::Nested"* %this)
+  // M32-DAG: define  dllexport   x86_thiscallcc void @"\01?virtualDef@Nested@ImportMembers@@UAEXXZ"(%"struct.ImportMembers::Nested"* %this)
-  // M64-DAG: define                             void @"\01?virtualDef@Nested@ImportMembers@@UEAAXXZ"(%"struct.ImportMembers::Nested"* %this)
+  // M64-DAG: define  dllexport                  void @"\01?virtualDef@Nested@ImportMembers@@UEAAXXZ"(%"struct.ImportMembers::Nested"* %this)
   // M32-DAG: declare dllimport   x86_thiscallcc void @"\01?virtualDecl@Nested@ImportMembers@@UAEXXZ"(%"struct.ImportMembers::Nested"*)
   // M64-DAG: declare dllimport                  void @"\01?virtualDecl@Nested@ImportMembers@@UEAAXXZ"(%"struct.ImportMembers::Nested"*)
   // M32-DAG: declare dllimport   x86_thiscallcc void @"\01?virtualInclass@Nested@ImportMembers@@UAEXXZ"(%"struct.ImportMembers::Nested"*)
@@ -300,7 +300,7 @@ struct ImportMembers::Nested {
   __declspec(dllimport) virtual        void virtualInlineDef();
   __declspec(dllimport) virtual inline void virtualInlineDecl();
 
-  // MSC-DAG: define                           void @"\01?staticDef@Nested@ImportMembers@@SAXXZ"()
+  // MSC-DAG: define  dllexport                void @"\01?staticDef@Nested@ImportMembers@@SAXXZ"()
   // MSC-DAG: declare dllimport                void @"\01?staticDecl@Nested@ImportMembers@@SAXXZ"()
   // MSC-DAG: declare dllimport                void @"\01?staticInclass@Nested@ImportMembers@@SAXXZ"()
   // MSC-DAG: declare dllimport                void @"\01?staticInlineDef@Nested@ImportMembers@@SAXXZ"()
@@ -595,16 +595,16 @@ inline ImportDefaultedDefs::ImportDefaultedDefs(const ImportDefaultedDefs&) = de
 // G64-DAG: define linkonce_odr                dereferenceable({{[0-9]+}}) %struct.ImportDefaultedDefs* @_ZN19ImportDefaultedDefsaSERKS_(%struct.ImportDefaultedDefs* %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
 inline ImportDefaultedDefs& ImportDefaultedDefs::operator=(const ImportDefaultedDefs&) = default;
 
-// M32-DAG: define x86_thiscallcc %struct.ImportDefaultedDefs* @"\01??0ImportDefaultedDefs@@QAE@$$QAU0@@Z"(%struct.ImportDefaultedDefs* returned %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
+// M32-DAG: define dllexport x86_thiscallcc %struct.ImportDefaultedDefs* @"\01??0ImportDefaultedDefs@@QAE@$$QAU0@@Z"(%struct.ImportDefaultedDefs* returned %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
-// M64-DAG: define                %struct.ImportDefaultedDefs* @"\01??0ImportDefaultedDefs@@QEAA@$$QEAU0@@Z"(%struct.ImportDefaultedDefs* returned %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
+// M64-DAG: define dllexport                %struct.ImportDefaultedDefs* @"\01??0ImportDefaultedDefs@@QEAA@$$QEAU0@@Z"(%struct.ImportDefaultedDefs* returned %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
 // G32-DAG: define x86_thiscallcc void @_ZN19ImportDefaultedDefsC1EOS_(%struct.ImportDefaultedDefs* %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
 // G64-DAG: define                void @_ZN19ImportDefaultedDefsC1EOS_(%struct.ImportDefaultedDefs* %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
 // G32-DAG: define x86_thiscallcc void @_ZN19ImportDefaultedDefsC2EOS_(%struct.ImportDefaultedDefs* %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
 // G64-DAG: define                void @_ZN19ImportDefaultedDefsC2EOS_(%struct.ImportDefaultedDefs* %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
 ImportDefaultedDefs::ImportDefaultedDefs(ImportDefaultedDefs&&) = default; // dllimport ignored
 
-// M32-DAG: define x86_thiscallcc dereferenceable({{[0-9]+}}) %struct.ImportDefaultedDefs* @"\01??4ImportDefaultedDefs@@QAEAAU0@$$QAU0@@Z"(%struct.ImportDefaultedDefs* %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
+// M32-DAG: define dllexport x86_thiscallcc dereferenceable({{[0-9]+}}) %struct.ImportDefaultedDefs* @"\01??4ImportDefaultedDefs@@QAEAAU0@$$QAU0@@Z"(%struct.ImportDefaultedDefs* %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
-// M64-DAG: define                dereferenceable({{[0-9]+}}) %struct.ImportDefaultedDefs* @"\01??4ImportDefaultedDefs@@QEAAAEAU0@$$QEAU0@@Z"(%struct.ImportDefaultedDefs* %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
+// M64-DAG: define dllexport                dereferenceable({{[0-9]+}}) %struct.ImportDefaultedDefs* @"\01??4ImportDefaultedDefs@@QEAAAEAU0@$$QEAU0@@Z"(%struct.ImportDefaultedDefs* %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
 // G32-DAG: define x86_thiscallcc dereferenceable({{[0-9]+}}) %struct.ImportDefaultedDefs* @_ZN19ImportDefaultedDefsaSEOS_(%struct.ImportDefaultedDefs* %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
 // G64-DAG: define                dereferenceable({{[0-9]+}}) %struct.ImportDefaultedDefs* @_ZN19ImportDefaultedDefsaSEOS_(%struct.ImportDefaultedDefs* %this, %struct.ImportDefaultedDefs* dereferenceable({{[0-9]+}}))
 ImportDefaultedDefs& ImportDefaultedDefs::operator=(ImportDefaultedDefs&&) = default; // dllimport ignored

clang/test/CodeGenCXX/dllimport.cpp

@@ -264,7 +264,7 @@ __declspec(dllimport) void redecl2();
                       void redecl2();
 USE(redecl2)
 
-// MSC-DAG: define void @"\01?redecl3@@YAXXZ"()
+// MSC-DAG: define dllexport void @"\01?redecl3@@YAXXZ"()
 // GNU-DAG: define void @_Z7redecl3v()
 __declspec(dllimport) void redecl3();
                       void redecl3() {} // dllimport ignored
@@ -276,7 +276,7 @@ USE(redecl3)
 // GNU-DAG: declare dllimport void @_Z7friend1v()
 // MSC-DAG: declare           void @"\01?friend2@@YAXXZ"()
 // GNU-DAG: declare           void @_Z7friend2v()
-// MSC-DAG: define            void @"\01?friend3@@YAXXZ"()
+// MSC-DAG: define  dllexport void @"\01?friend3@@YAXXZ"()
 // GNU-DAG: define            void @_Z7friend3v()
 // MSC-DAG: declare           void @"\01?friend4@@YAXXZ"()
 // GNU-DAG: declare           void @_Z7friend4v()

clang/test/Sema/dllimport.c

@@ -34,17 +34,49 @@ __declspec(dllimport) int GlobalInit1 = 1; // expected-error{{definition of dlli
 int __declspec(dllimport) GlobalInit2 = 1; // expected-error{{definition of dllimport data}}
 
 // Declare, then reject definition.
-__declspec(dllimport) extern int ExternGlobalDeclInit; // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
-int ExternGlobalDeclInit = 1; // expected-warning{{'ExternGlobalDeclInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+// expected-note@+2{{previous attribute is here}}
+#endif
+__declspec(dllimport) extern int ExternGlobalDeclInit; // expected-note{{previous declaration is here}}
+#ifdef MS
+// expected-warning@+4{{'ExternGlobalDeclInit' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+2{{'ExternGlobalDeclInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+int ExternGlobalDeclInit = 1;
 
-__declspec(dllimport) int GlobalDeclInit; // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
-int GlobalDeclInit = 1; // expected-warning{{'GlobalDeclInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+// expected-note@+2{{previous attribute is here}}
+#endif
+__declspec(dllimport) int GlobalDeclInit; // expected-note{{previous declaration is here}}
+#ifdef MS
+// expected-warning@+4{{'GlobalDeclInit' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+2{{'GlobalDeclInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+int GlobalDeclInit = 1;
 
-int *__attribute__((dllimport)) GlobalDeclChunkAttrInit; // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
-int *GlobalDeclChunkAttrInit = 0; // expected-warning{{'GlobalDeclChunkAttrInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+// expected-note@+2{{previous attribute is here}}
+#endif
+int *__attribute__((dllimport)) GlobalDeclChunkAttrInit; // expected-note{{previous declaration is here}}
+#ifdef MS
+// expected-warning@+4{{'GlobalDeclChunkAttrInit' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+2{{'GlobalDeclChunkAttrInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+int *GlobalDeclChunkAttrInit = 0;
 
-int GlobalDeclAttrInit __attribute__((dllimport)); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
-int GlobalDeclAttrInit = 1; // expected-warning{{'GlobalDeclAttrInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+// expected-note@+2{{previous attribute is here}}
+#endif
+int GlobalDeclAttrInit __attribute__((dllimport)); // expected-note{{previous declaration is here}}
+#ifdef MS
+// expected-warning@+4{{'GlobalDeclAttrInit' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+2{{'GlobalDeclAttrInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+int GlobalDeclAttrInit = 1;
 
 // Redeclarations
 __declspec(dllimport) extern int GlobalRedecl1;
@@ -59,8 +91,7 @@ int *__attribute__((dllimport)) GlobalRedecl2b;
 int GlobalRedecl2c __attribute__((dllimport));
 int GlobalRedecl2c __attribute__((dllimport));
 
-// NB: MSVC issues a warning and makes GlobalRedecl3 dllexport. We follow GCC
+// We follow GCC and drop the dllimport with a warning.
-// and drop the dllimport with a warning.
 __declspec(dllimport) extern int GlobalRedecl3; // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
                       extern int GlobalRedecl3; // expected-warning{{'GlobalRedecl3' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
 
@@ -133,13 +164,20 @@ inline void __attribute__((dllimport)) inlineFunc2() {}
 __declspec(dllimport) void redecl1();
 __declspec(dllimport) void redecl1();
 
-// NB: MSVC issues a warning and makes redecl2/redecl3 dllexport. We follow GCC
-// and drop the dllimport with a warning.
 __declspec(dllimport) void redecl2(); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
                       void redecl2(); // expected-warning{{'redecl2' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
 
-__declspec(dllimport) void redecl3(); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
-                      void redecl3() {} // expected-warning{{'redecl3' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+                      // expected-note@+2{{previous attribute is here}}
+#endif
+                      __declspec(dllimport) void redecl3(); // expected-note{{previous declaration is here}}
+                      // NB: Both MSVC and Clang issue a warning and make redecl3 dllexport.
+#ifdef MS
+                      // expected-warning@+4{{'redecl3' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+                      // expected-warning@+2{{'redecl3' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+                      void redecl3() {}
 
                       void redecl4(); // expected-note{{previous declaration is here}}
 void useRedecl4() { redecl4(); }

clang/test/SemaCXX/dllimport.cpp

@@ -44,17 +44,49 @@ __declspec(dllimport) int GlobalInit1 = 1; // expected-error{{definition of dlli
 int __declspec(dllimport) GlobalInit2 = 1; // expected-error{{definition of dllimport data}}
 
 // Declare, then reject definition.
-__declspec(dllimport) extern int ExternGlobalDeclInit; // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
-int ExternGlobalDeclInit = 1; // expected-warning{{'ExternGlobalDeclInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+// expected-note@+2{{previous attribute is here}}
+#endif
+__declspec(dllimport) extern int ExternGlobalDeclInit; // expected-note{{previous declaration is here}}
+#ifdef MS
+// expected-warning@+4{{'ExternGlobalDeclInit' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+2{{'ExternGlobalDeclInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+int ExternGlobalDeclInit = 1;
 
-__declspec(dllimport) int GlobalDeclInit; // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
-int GlobalDeclInit = 1; // expected-warning{{'GlobalDeclInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+// expected-note@+2{{previous attribute is here}}
+#endif
+__declspec(dllimport) int GlobalDeclInit; // expected-note{{previous declaration is here}}
+#ifdef MS
+// expected-warning@+4{{'GlobalDeclInit' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+2{{'GlobalDeclInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+int GlobalDeclInit = 1;
 
-int *__attribute__((dllimport)) GlobalDeclChunkAttrInit; // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
-int *GlobalDeclChunkAttrInit = 0; // expected-warning{{'GlobalDeclChunkAttrInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+// expected-note@+2{{previous attribute is here}}
+#endif
+int *__attribute__((dllimport)) GlobalDeclChunkAttrInit; // expected-note{{previous declaration is here}}
+#ifdef MS
+// expected-warning@+4{{'GlobalDeclChunkAttrInit' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+2{{'GlobalDeclChunkAttrInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+int *GlobalDeclChunkAttrInit = 0;
 
-int GlobalDeclAttrInit __attribute__((dllimport)); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
-int GlobalDeclAttrInit = 1; // expected-warning{{'GlobalDeclAttrInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+// expected-note@+2{{previous attribute is here}}
+#endif
+int GlobalDeclAttrInit __attribute__((dllimport)); // expected-note{{previous declaration is here}}
+#ifdef MS
+// expected-warning@+4{{'GlobalDeclAttrInit' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+2{{'GlobalDeclAttrInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+int GlobalDeclAttrInit = 1;
 
 // Redeclarations
 __declspec(dllimport) extern int GlobalRedecl1;
@@ -69,8 +101,6 @@ int *__attribute__((dllimport)) GlobalRedecl2b;
 int GlobalRedecl2c __attribute__((dllimport));
 int GlobalRedecl2c __attribute__((dllimport));
 
-// NB: MSVC issues a warning and makes GlobalRedecl3 dllexport. We follow GCC
-// and drop the dllimport with a warning.
 __declspec(dllimport) extern int GlobalRedecl3; // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
                       extern int GlobalRedecl3; // expected-warning{{'GlobalRedecl3' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
 
@@ -135,11 +165,31 @@ template<typename T> __declspec(dllimport) int VarTmplInit1 = 1; // expected-err
 template<typename T> int __declspec(dllimport) VarTmplInit2 = 1; // expected-error{{definition of dllimport data}}
 
 // Declare, then reject definition.
-template<typename T> __declspec(dllimport) extern int ExternVarTmplDeclInit; // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
-template<typename T>                              int ExternVarTmplDeclInit = 1; // expected-warning{{'ExternVarTmplDeclInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+// expected-note@+3{{previous attribute is here}}
+#endif
+template <typename T>
+__declspec(dllimport) extern int ExternVarTmplDeclInit; // expected-note{{previous declaration is here}}
+#ifdef MS
+// expected-warning@+5{{'ExternVarTmplDeclInit' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+3{{'ExternVarTmplDeclInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+template <typename T>
+int ExternVarTmplDeclInit = 1;
 
-template<typename T> __declspec(dllimport) int VarTmplDeclInit; // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
-template<typename T>                       int VarTmplDeclInit = 1; // expected-warning{{'VarTmplDeclInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+// expected-note@+3{{previous attribute is here}}
+#endif
+template <typename T>
+__declspec(dllimport) int VarTmplDeclInit; // expected-note{{previous declaration is here}}
+#ifdef MS
+// expected-warning@+5{{'VarTmplDeclInit' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+3{{'VarTmplDeclInit' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+template <typename T>
+int VarTmplDeclInit = 1;
 
 // Redeclarations
 template<typename T> __declspec(dllimport) extern int VarTmplRedecl1;
@@ -238,13 +288,20 @@ __declspec(dllimport) void inlineDef();
 __declspec(dllimport) void redecl1();
 __declspec(dllimport) void redecl1();
 
-// NB: MSVC issues a warning and makes redecl2/redecl3 dllexport. We follow GCC
-// and drop the dllimport with a warning.
 __declspec(dllimport) void redecl2(); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
                       void redecl2(); // expected-warning{{'redecl2' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
 
-__declspec(dllimport) void redecl3(); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
-                      void redecl3() {} // expected-warning{{'redecl3' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+                      // expected-note@+2{{previous attribute is here}}
+#endif
+                      __declspec(dllimport) void redecl3(); // expected-note{{previous declaration is here}}
+                      // NB: Both MSVC and Clang issue a warning and make redecl3 dllexport.
+#ifdef MS
+                      // expected-warning@+4{{'redecl3' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+                      // expected-warning@+2{{'redecl3' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+                      void redecl3() {}
 
                       void redecl4(); // expected-note{{previous declaration is here}}
 __declspec(dllimport) void redecl4(); // expected-warning{{redeclaration of 'redecl4' should not add 'dllimport' attribute}}
@@ -266,7 +323,10 @@ __declspec(dllimport) inline void redecl6() {} // expected-warning{{'dllimport'
 struct FuncFriend {
   friend __declspec(dllimport) void friend1();
   friend __declspec(dllimport) void friend2(); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
-  friend __declspec(dllimport) void friend3(); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
+// expected-note@+2{{previous attribute is here}}
+#endif
+  friend __declspec(dllimport) void friend3(); // expected-note{{previous declaration is here}}
   friend                       void friend4(); // expected-note{{previous declaration is here}}
 #ifdef MS
 // expected-note@+2{{previous declaration is here}}
@@ -275,7 +335,12 @@ struct FuncFriend {
 };
 __declspec(dllimport) void friend1();
                       void friend2(); // expected-warning{{'friend2' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
-                      void friend3() {} // expected-warning{{'friend3' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#ifdef MS
+                      // expected-warning@+4{{'friend3' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+                      // expected-warning@+2{{'friend3' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+                      void friend3() {}
 __declspec(dllimport) void friend4(); // expected-warning{{redeclaration of 'friend4' should not add 'dllimport' attribute}}
 #ifdef MS
 __declspec(dllimport) inline void friend5() {} // expected-warning{{redeclaration of 'friend5' should not add 'dllimport' attribute}}
@@ -447,33 +512,39 @@ template<> __declspec(dllimport) inline void funcTmpl<ExplicitSpec_InlineDef_Imp
 struct ImportMembers {
   struct Nested {
     __declspec(dllimport) void normalDecl();
-    __declspec(dllimport) void normalDef(); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
+// expected-note@+2{{previous attribute is here}}
+#endif
+    __declspec(dllimport) void normalDef(); // expected-note{{previous declaration is here}}
   };
 
 #ifdef GNU
+// expected-note@+5{{previous attribute is here}}
 // expected-warning@+5{{'dllimport' attribute ignored on inline function}}
 // expected-warning@+6{{'dllimport' attribute ignored on inline function}}
 #endif
   __declspec(dllimport)                void normalDecl();
-  __declspec(dllimport)                void normalDef(); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+  __declspec(dllimport) void normalDef(); // expected-note{{previous declaration is here}}
   __declspec(dllimport)                void normalInclass() {}
   __declspec(dllimport)                void normalInlineDef();
   __declspec(dllimport)         inline void normalInlineDecl();
 #ifdef GNU
+// expected-note@+5{{previous attribute is here}}
 // expected-warning@+5{{'dllimport' attribute ignored on inline function}}
 // expected-warning@+6{{'dllimport' attribute ignored on inline function}}
 #endif
   __declspec(dllimport) virtual        void virtualDecl();
-  __declspec(dllimport) virtual        void virtualDef(); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+  __declspec(dllimport) virtual void virtualDef(); // expected-note{{previous declaration is here}}
   __declspec(dllimport) virtual        void virtualInclass() {}
   __declspec(dllimport) virtual        void virtualInlineDef();
   __declspec(dllimport) virtual inline void virtualInlineDecl();
 #ifdef GNU
+// expected-note@+5{{previous attribute is here}}
 // expected-warning@+5{{'dllimport' attribute ignored on inline function}}
 // expected-warning@+6{{'dllimport' attribute ignored on inline function}}
 #endif
   __declspec(dllimport) static         void staticDecl();
-  __declspec(dllimport) static         void staticDef(); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+  __declspec(dllimport) static void staticDef(); // expected-note{{previous declaration is here}}
   __declspec(dllimport) static         void staticInclass() {}
   __declspec(dllimport) static         void staticInlineDef();
   __declspec(dllimport) static  inline void staticInlineDecl();
@@ -495,20 +566,40 @@ public:
   __declspec(dllimport) constexpr static int ConstexprFieldDef = 1; // expected-note{{attribute is here}}
 };
 
-       void ImportMembers::Nested::normalDef() {} // expected-warning{{'ImportMembers::Nested::normalDef' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#ifdef MS
-       void ImportMembers::normalDef() {} // expected-warning{{'ImportMembers::normalDef' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+// expected-warning@+4{{'ImportMembers::Nested::normalDef' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+                                                                                 // expected-warning@+2{{'ImportMembers::Nested::normalDef' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+void ImportMembers::Nested::normalDef() {}
+#ifdef MS
+// expected-warning@+4{{'ImportMembers::normalDef' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+                                                                                 // expected-warning@+2{{'ImportMembers::normalDef' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+void ImportMembers::normalDef() {}
 #ifdef GNU
 // expected-warning@+2{{'ImportMembers::normalInlineDef' redeclared inline; 'dllimport' attribute ignored}}
 #endif
 inline void ImportMembers::normalInlineDef() {}
        void ImportMembers::normalInlineDecl() {}
-       void ImportMembers::virtualDef() {} // expected-warning{{'ImportMembers::virtualDef' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#ifdef MS
+       // expected-warning@+4{{'ImportMembers::virtualDef' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+                                                                                 // expected-warning@+2{{'ImportMembers::virtualDef' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+       void ImportMembers::virtualDef() {}
 #ifdef GNU
 // expected-warning@+2{{'ImportMembers::virtualInlineDef' redeclared inline; 'dllimport' attribute ignored}}
 #endif
 inline void ImportMembers::virtualInlineDef() {}
        void ImportMembers::virtualInlineDecl() {}
-       void ImportMembers::staticDef() {} // expected-warning{{'ImportMembers::staticDef' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#ifdef MS
+       // expected-warning@+4{{'ImportMembers::staticDef' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+                                                                                 // expected-warning@+2{{'ImportMembers::staticDef' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+       void ImportMembers::staticDef() {}
 #ifdef GNU
 // expected-warning@+2{{'ImportMembers::staticInlineDef' redeclared inline; 'dllimport' attribute ignored}}
 #endif
@@ -620,7 +711,10 @@ struct ImportDefaulted {
 // Import defaulted member function definitions.
 struct ImportDefaultedDefs {
   __declspec(dllimport) ImportDefaultedDefs();
-  __declspec(dllimport) ~ImportDefaultedDefs(); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
+// expected-note@+2{{previous attribute is here}}
+#endif
+  __declspec(dllimport) ~ImportDefaultedDefs(); // expected-note{{previous declaration is here}}
 
 #ifdef GNU
 // expected-warning@+3{{'dllimport' attribute ignored on inline function}}
@@ -630,14 +724,22 @@ struct ImportDefaultedDefs {
   __declspec(dllimport) ImportDefaultedDefs& operator=(const ImportDefaultedDefs&);
 
   __declspec(dllimport) ImportDefaultedDefs(ImportDefaultedDefs&&);
-  __declspec(dllimport) ImportDefaultedDefs& operator=(ImportDefaultedDefs&&); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
+// expected-note@+2{{previous attribute is here}}
+#endif
+  __declspec(dllimport) ImportDefaultedDefs &operator=(ImportDefaultedDefs &&); // expected-note{{previous declaration is here}}
 };
 
 // Not allowed on definitions.
 __declspec(dllimport) ImportDefaultedDefs::ImportDefaultedDefs() = default; // expected-error{{dllimport cannot be applied to non-inline function definition}}
 
+#ifdef MS
+// expected-warning@+5{{'ImportDefaultedDefs::~ImportDefaultedDefs' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+3{{'ImportDefaultedDefs::~ImportDefaultedDefs' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
 // dllimport cannot be dropped.
-ImportDefaultedDefs::~ImportDefaultedDefs() = default; // expected-warning{{'ImportDefaultedDefs::~ImportDefaultedDefs' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+ImportDefaultedDefs::~ImportDefaultedDefs() = default;
 
 // Import inline declaration and definition.
 #ifdef GNU
@@ -648,8 +750,12 @@ __declspec(dllimport) ImportDefaultedDefs::ImportDefaultedDefs(const ImportDefau
 inline ImportDefaultedDefs& ImportDefaultedDefs::operator=(const ImportDefaultedDefs&) = default;
 
 __declspec(dllimport) ImportDefaultedDefs::ImportDefaultedDefs(ImportDefaultedDefs&&) = default; // expected-error{{dllimport cannot be applied to non-inline function definition}}
-ImportDefaultedDefs& ImportDefaultedDefs::operator=(ImportDefaultedDefs&&) = default; // expected-warning{{'ImportDefaultedDefs::operator=' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#ifdef MS
-
+// expected-warning@+4{{'ImportDefaultedDefs::operator=' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+2{{'ImportDefaultedDefs::operator=' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+ImportDefaultedDefs &ImportDefaultedDefs::operator=(ImportDefaultedDefs &&) = default;
 
 // Redeclarations cannot add dllimport.
 struct MemberRedecl {
@@ -970,13 +1076,22 @@ template<> __declspec(dllimport) const int MemVarTmpl::StaticVar<ExplicitSpec_De
 template<typename T>
 struct ImportClassTmplMembers {
   __declspec(dllimport)                void normalDecl();
-  __declspec(dllimport)                void normalDef(); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
+// expected-note@+2{{previous attribute is here}}
+#endif
+  __declspec(dllimport) void normalDef(); // expected-note{{previous declaration is here}}
   __declspec(dllimport)                void normalInlineDef();
   __declspec(dllimport) virtual        void virtualDecl();
-  __declspec(dllimport) virtual        void virtualDef(); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
+// expected-note@+2{{previous attribute is here}}
+#endif
+  __declspec(dllimport) virtual void virtualDef(); // expected-note{{previous declaration is here}}
   __declspec(dllimport) virtual        void virtualInlineDef();
   __declspec(dllimport) static         void staticDecl();
-  __declspec(dllimport) static         void staticDef(); // expected-note{{previous declaration is here}} expected-note{{previous attribute is here}}
+#ifdef GNU
+// expected-note@+2{{previous attribute is here}}
+#endif
+  __declspec(dllimport) static void staticDef(); // expected-note{{previous declaration is here}}
   __declspec(dllimport) static         void staticInlineDef();
 
 #ifdef GNU
@@ -1013,19 +1128,37 @@ public:
 
 // NB: MSVC is inconsistent here and disallows *InlineDef on class templates,
 // but allows it on classes. We allow both.
-template<typename T>        void ImportClassTmplMembers<T>::normalDef() {} // expected-warning{{'ImportClassTmplMembers::normalDef' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#ifdef MS
+// expected-warning@+5{{'ImportClassTmplMembers::normalDef' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+3{{'ImportClassTmplMembers::normalDef' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+template <typename T>
+void ImportClassTmplMembers<T>::normalDef() {}
 #ifdef GNU
 // expected-warning@+2{{'ImportClassTmplMembers::normalInlineDef' redeclared inline; 'dllimport' attribute ignored}}
 #endif
 template<typename T> inline void ImportClassTmplMembers<T>::normalInlineDef() {}
 template<typename T>        void ImportClassTmplMembers<T>::normalInlineDecl() {}
-template<typename T>        void ImportClassTmplMembers<T>::virtualDef() {} // expected-warning{{'ImportClassTmplMembers::virtualDef' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#ifdef MS
+// expected-warning@+5{{'ImportClassTmplMembers::virtualDef' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+3{{'ImportClassTmplMembers::virtualDef' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+template <typename T>
+void ImportClassTmplMembers<T>::virtualDef() {}
 #ifdef GNU
 // expected-warning@+2{{'ImportClassTmplMembers::virtualInlineDef' redeclared inline; 'dllimport' attribute ignored}}
 #endif
 template<typename T> inline void ImportClassTmplMembers<T>::virtualInlineDef() {}
 template<typename T>        void ImportClassTmplMembers<T>::virtualInlineDecl() {}
-template<typename T>        void ImportClassTmplMembers<T>::staticDef() {} // expected-warning{{'ImportClassTmplMembers::staticDef' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#ifdef MS
+// expected-warning@+5{{'ImportClassTmplMembers::staticDef' redeclared without 'dllimport' attribute: 'dllexport' attribute added}}
+#else
+// expected-warning@+3{{'ImportClassTmplMembers::staticDef' redeclared without 'dllimport' attribute: previous 'dllimport' ignored}}
+#endif
+template <typename T>
+void ImportClassTmplMembers<T>::staticDef() {}
 #ifdef GNU
 // expected-warning@+2{{'ImportClassTmplMembers::staticInlineDef' redeclared inline; 'dllimport' attribute ignored}}
 #endif