Index: clang/docs/UsersManual.rst
===================================================================
--- clang/docs/UsersManual.rst
+++ clang/docs/UsersManual.rst
@@ -3624,6 +3624,23 @@
 `Some tests might fail <https://bugs.llvm.org/show_bug.cgi?id=9072>`_ on
 ``x86_64-w64-mingw32``.
 
+AIX
+^^^
+
+The ``-mdefault-visibility-export-mapping=`` option can be used to control
+mapping of default visibility to an explicit shared object export
+(i.e. XCOFF exported visibility). Three values are provided for the option:
+
+* ``-mdefault-visibility-export-mapping=none``: no additional export
+  information is created for entities with default visibility.
+* ``-mdefault-visibility-export-mapping=explicit``: mark entities for export
+  if they have explict (e.g. via an attribute) default visibility from the
+  source, including RTTI.
+* ``-mdefault-visibility-export-mapping=all``: set XCOFF exported visibility
+  for all entities with default visibility from any source. This gives a
+  export behavior similar to ELF platforms where all entities with default
+  visibility are exported.
+
 .. _spir-v:
 
 SPIR-V support
Index: clang/include/clang/Basic/LangOptions.h
===================================================================
--- clang/include/clang/Basic/LangOptions.h
+++ clang/include/clang/Basic/LangOptions.h
@@ -353,6 +353,14 @@
     PerThread,
   };
 
+  enum class DefaultVisiblityExportMapping {
+    None,
+    /// map only explicit public visibilities to exported
+    Explicit,
+    /// map all public visibilities to exported
+    All,
+  };
+
 public:
   /// The used language standard.
   LangStandard::Kind LangStd;
@@ -584,6 +592,16 @@
 
   bool isSYCL() const { return SYCLIsDevice || SYCLIsHost; }
 
+  bool isExplicitDefaultVisibilityExportMapping() const {
+    return getDefaultVisibilityExportMapping() ==
+           DefaultVisiblityExportMapping::Explicit;
+  }
+
+  bool isAllDefaultVisibilityExportMapping() const {
+    return getDefaultVisibilityExportMapping() ==
+           DefaultVisiblityExportMapping::All;
+  }
+
   /// Remap path prefix according to -fmacro-prefix-path option.
   void remapPathPrefix(SmallVectorImpl<char> &Path) const;
 };
Index: clang/include/clang/Basic/LangOptions.def
===================================================================
--- clang/include/clang/Basic/LangOptions.def
+++ clang/include/clang/Basic/LangOptions.def
@@ -289,6 +289,7 @@
 BENIGN_LANGOPT(DumpVTableLayouts , 1, 0, "dumping the layouts of emitted vtables")
 LANGOPT(NoConstantCFStrings , 1, 0, "no constant CoreFoundation strings")
 BENIGN_LANGOPT(InlineVisibilityHidden , 1, 0, "hidden visibility for inline C++ methods")
+BENIGN_ENUM_LANGOPT(DefaultVisibilityExportMapping, DefaultVisiblityExportMapping, 2, DefaultVisiblityExportMapping::None, "controls mapping of public visibility to dllexport")
 BENIGN_LANGOPT(IgnoreXCOFFVisibility, 1, 0, "All the visibility attributes that are specified in the source code are ignored in aix XCOFF.")
 BENIGN_LANGOPT(VisibilityInlinesHiddenStaticLocalVar, 1, 0,
                "hidden visibility for static local variables in inline C++ "
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -2908,6 +2908,13 @@
 def fvisibility_global_new_delete_hidden : Flag<["-"], "fvisibility-global-new-delete-hidden">, Group<f_Group>,
   HelpText<"Give global C++ operator new and delete declarations hidden visibility">, Flags<[CC1Option]>,
   MarshallingInfoFlag<LangOpts<"GlobalAllocationFunctionVisibilityHidden">>;
+def mdefault_visibility_export_mapping_EQ : Joined<["-"], "mdefault-visibility-export-mapping=">,
+  Values<"none,explicit,all">,
+  NormalizedValuesScope<"LangOptions::DefaultVisiblityExportMapping">,
+  NormalizedValues<["None", "Explicit", "All"]>,
+  HelpText<"Mapping between default visibility and export">,
+  Group<m_Group>, Flags<[CC1Option]>,
+  MarshallingInfoEnum<LangOpts<"DefaultVisibilityExportMapping">,"None">;
 defm new_infallible : BoolFOption<"new-infallible",
   LangOpts<"NewInfallible">, DefaultFalse,
   PosFlag<SetTrue, [], "Enable">, NegFlag<SetFalse, [], "Disable">,
Index: clang/lib/CodeGen/CodeGenModule.h
===================================================================
--- clang/lib/CodeGen/CodeGenModule.h
+++ clang/lib/CodeGen/CodeGenModule.h
@@ -798,6 +798,7 @@
 
   void setDSOLocal(llvm::GlobalValue *GV) const;
 
+  bool shouldMapVisibilityToDLLExport(const NamedDecl *D) const;
   void setDLLImportDLLExport(llvm::GlobalValue *GV, GlobalDecl D) const;
   void setDLLImportDLLExport(llvm::GlobalValue *GV, const NamedDecl *D) const;
   /// Set visibility, dllimport/dllexport and dso_local.
Index: clang/lib/CodeGen/CodeGenModule.cpp
===================================================================
--- clang/lib/CodeGen/CodeGenModule.cpp
+++ clang/lib/CodeGen/CodeGenModule.cpp
@@ -1212,12 +1212,21 @@
   setDLLImportDLLExport(GV, D);
 }
 
+bool CodeGenModule::shouldMapVisibilityToDLLExport(const NamedDecl *D) const {
+  return (D->getLinkageAndVisibility().getVisibility() == DefaultVisibility) &&
+         ((D->getLinkageAndVisibility().isVisibilityExplicit() &&
+           getLangOpts().isExplicitDefaultVisibilityExportMapping()) ||
+          getLangOpts().isAllDefaultVisibilityExportMapping());
+}
+
 void CodeGenModule::setDLLImportDLLExport(llvm::GlobalValue *GV,
                                           const NamedDecl *D) const {
   if (D && D->isExternallyVisible()) {
     if (D->hasAttr<DLLImportAttr>())
       GV->setDLLStorageClass(llvm::GlobalVariable::DLLImportStorageClass);
-    else if (D->hasAttr<DLLExportAttr>() && !GV->isDeclarationForLinker())
+    else if ((D->hasAttr<DLLExportAttr>() ||
+              shouldMapVisibilityToDLLExport(D)) &&
+             !GV->isDeclarationForLinker())
       GV->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass);
   }
 }
Index: clang/lib/CodeGen/ItaniumCXXABI.cpp
===================================================================
--- clang/lib/CodeGen/ItaniumCXXABI.cpp
+++ clang/lib/CodeGen/ItaniumCXXABI.cpp
@@ -3680,12 +3680,12 @@
 
   llvm::GlobalValue::DLLStorageClassTypes DLLStorageClass =
       llvm::GlobalValue::DefaultStorageClass;
-  if (CGM.getTriple().isWindowsItaniumEnvironment()) {
-    auto RD = Ty->getAsCXXRecordDecl();
-    if (RD && RD->hasAttr<DLLExportAttr>())
+  if (auto RD = Ty->getAsCXXRecordDecl()) {
+    if ((CGM.getTriple().isWindowsItaniumEnvironment() &&
+         RD->hasAttr<DLLExportAttr>()) ||
+        CGM.shouldMapVisibilityToDLLExport(RD))
       DLLStorageClass = llvm::GlobalValue::DLLExportStorageClass;
   }
-
   return BuildTypeInfo(Ty, Linkage, llvmVisibility, DLLStorageClass);
 }
 
@@ -4168,7 +4168,7 @@
       getContext().Char32Ty
   };
   llvm::GlobalValue::DLLStorageClassTypes DLLStorageClass =
-      RD->hasAttr<DLLExportAttr>()
+      RD->hasAttr<DLLExportAttr>() || CGM.shouldMapVisibilityToDLLExport(RD)
       ? llvm::GlobalValue::DLLExportStorageClass
       : llvm::GlobalValue::DefaultStorageClass;
   llvm::GlobalValue::VisibilityTypes Visibility =
Index: clang/lib/CodeGen/MicrosoftCXXABI.cpp
===================================================================
--- clang/lib/CodeGen/MicrosoftCXXABI.cpp
+++ clang/lib/CodeGen/MicrosoftCXXABI.cpp
@@ -47,7 +47,11 @@
       : CGCXXABI(CGM), BaseClassDescriptorType(nullptr),
         ClassHierarchyDescriptorType(nullptr),
         CompleteObjectLocatorType(nullptr), CatchableTypeType(nullptr),
-        ThrowInfoType(nullptr) {}
+        ThrowInfoType(nullptr) {
+    assert(!(CGM.getLangOpts().isExplicitDefaultVisibilityExportMapping() ||
+             CGM.getLangOpts().isAllDefaultVisibilityExportMapping()) &&
+           "visibility export mapping option unimplemented in this ABI");
+  }
 
   bool HasThisReturn(GlobalDecl GD) const override;
   bool hasMostDerivedReturn(GlobalDecl GD) const override;
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -5966,6 +5966,14 @@
           << A->getAsString(Args) << TripleStr;
   }
 
+  if (const Arg *A =
+          Args.getLastArg(options::OPT_mdefault_visibility_export_mapping_EQ)) {
+    if (Triple.isOSAIX())
+      A->render(Args, CmdArgs);
+    else
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getAsString(Args) << TripleStr;
+  }
 
   if (Args.hasFlag(options::OPT_fvisibility_inlines_hidden,
                     options::OPT_fno_visibility_inlines_hidden, false))
Index: clang/test/CodeGen/mdefault-visibility-export-mapping.c
===================================================================
--- /dev/null
+++ clang/test/CodeGen/mdefault-visibility-export-mapping.c
@@ -0,0 +1,29 @@
+// RUN: %clang_cc1 -triple powerpc-ibm-aix %s -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=UNSPECIFIED-DEF,EXPLICIT-DEF %s
+// RUN: %clang_cc1 -triple powerpc-ibm-aix %s -mdefault-visibility-export-mapping=none -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=UNSPECIFIED-DEF,EXPLICIT-DEF %s
+// RUN: %clang_cc1 -triple powerpc-ibm-aix %s -mdefault-visibility-export-mapping=explicit -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=UNSPECIFIED-DEF,EXPLICIT-EXP %s
+// RUN: %clang_cc1 -triple powerpc-ibm-aix %s -mdefault-visibility-export-mapping=all -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=UNSPECIFIED-EXP,EXPLICIT-EXP %s
+// RUN: %clang -target powerpc-ibm-aix %s -mdefault-visibility-export-mapping=all -fvisibility=hidden -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=UNSPECIFIED-HID,EXPLICIT-EXP %s
+
+// RUN: not %clang -mdefault-visibility-export-mapping=explicit -target powerpc-unknown-linux %s 2>&1 | \
+// RUN: FileCheck -check-prefix=ERROR %s
+// ERROR: unsupported option '-mdefault-visibility-export-mapping=explicit' for target 'powerpc-unknown-linux'
+
+// UNSPECIFIED-DEF: define void @func()
+// UNSPECIFIED-HID: define hidden void @func()
+// UNSPECIFIED-EXP: define dllexport void @func()
+void func() {}
+
+#pragma GCC visibility push(default)
+// EXPLICIT-DEF: define void @pragmafunc()
+// EXPLICIT-EXP: define dllexport void @pragmafunc()
+void pragmafunc() {}
+#pragma GCC visibility pop
+
+// EXPLICIT-DEF: define void @explicitfunc()
+// EXPLICIT-EXP: define dllexport void @explicitfunc()
+void __attribute__((visibility("default"))) explicitfunc() {}
Index: clang/test/CodeGenCXX/mdefault-visibility-export-mapping-rtti.cpp
===================================================================
--- /dev/null
+++ clang/test/CodeGenCXX/mdefault-visibility-export-mapping-rtti.cpp
@@ -0,0 +1,571 @@
+// RUN: %clang_cc1 -triple powerpc64-ibm-aix %s -internal-isystem %S -mdefault-visibility-export-mapping=none -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=UNSPECIFIED-DEF,EXPLICIT-DEF,FUND-DEF %s
+// RUN: %clang_cc1 -triple powerpc64-ibm-aix %s -internal-isystem %S -mdefault-visibility-export-mapping=explicit -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=UNSPECIFIED-DEF,EXPLICIT-EXP,FUND-DEF %s
+// RUN: %clang_cc1 -triple powerpc64-ibm-aix %s -internal-isystem %S -mdefault-visibility-export-mapping=explicit -DFUNDAMENTAL_IS_EXPLICIT -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=UNSPECIFIED-DEF,EXPLICIT-EXP,FUND-EXP %s
+// RUN: %clang_cc1 -triple powerpc64-ibm-aix %s -internal-isystem %S -mdefault-visibility-export-mapping=all -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=UNSPECIFIED-EXP,EXPLICIT-EXP,FUND-EXP %s
+// RUN: %clang_cc1 -triple powerpc64-ibm-aix %s -internal-isystem %S -mdefault-visibility-export-mapping=all -fvisibility hidden -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=UNSPECIFIED-HID,EXPLICIT-EXP,FUND-HID %s
+// RUN: %clang_cc1 -triple powerpc64-ibm-aix %s -internal-isystem %S -mdefault-visibility-export-mapping=all -DFUNDAMENTAL_IS_EXPLICIT -fvisibility hidden -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=UNSPECIFIED-HID,EXPLICIT-EXP,FUND-EXP %s
+
+#include <typeinfo>
+
+// unspecified visibility RTTI & vtable
+struct s {
+  virtual void foo();
+};
+void s::foo() {}
+// UNSPECIFIED-DEF: @_ZTV1s = unnamed_addr constant
+// UNSPECIFIED-HID: @_ZTV1s = hidden unnamed_addr constant
+// UNSPECIFIED-EXP: @_ZTV1s = dllexport unnamed_addr constant
+// UNSPECIFIED-DEF: @_ZTS1s = constant
+// UNSPECIFIED-HID: @_ZTS1s = hidden constant
+// UNSPECIFIED-EXP: @_ZTS1s = dllexport constant
+// UNSPECIFIED-DEF: @_ZTI1s = constant
+// UNSPECIFIED-HID: @_ZTI1s = hidden constant
+// UNSPECIFIED-EXP: @_ZTI1s = dllexport constant
+
+// explicit default visibility RTTI & vtable
+struct __attribute__((type_visibility("default"))) t {
+  virtual void foo();
+};
+void t::foo() {}
+// EXPLICIT-DEF: @_ZTV1t = unnamed_addr constant
+// EXPLICIT-HID: @_ZTV1t = hidden unnamed_addr constant
+// EXPLICIT-EXP: @_ZTV1t = dllexport unnamed_addr constant
+// EXPLICIT-DEF: @_ZTS1t = constant
+// EXPLICIT-HID: @_ZTS1t = hidden constant
+// EXPLICIT-EXP: @_ZTS1t = dllexport constant
+// EXPLICIT-DEF: @_ZTI1t = constant
+// EXPLICIT-HID: @_ZTI1t = hidden constant
+// EXPLICIT-EXP: @_ZTI1t = dllexport constant
+
+#ifdef FUNDAMENTAL_IS_EXPLICIT
+#define TYPE_VIS __attribute__((type_visibility("default")))
+#else
+#define TYPE_VIS
+#endif
+
+// Invoke the compiler magic to emit RTTI for fundamental types.
+namespace __cxxabiv1 {
+class TYPE_VIS __fundamental_type_info {
+  __attribute__((visibility("hidden"))) virtual ~__fundamental_type_info();
+};
+
+__fundamental_type_info::~__fundamental_type_info() {}
+
+} // namespace __cxxabiv1
+
+// __cxxabiv1::__fundamental_type_info
+// FUND-DEF: @_ZTVN10__cxxabiv123__fundamental_type_infoE = unnamed_addr constant
+// FUND-HID: @_ZTVN10__cxxabiv123__fundamental_type_infoE = hidden unnamed_addr constant
+// FUND-EXP: @_ZTVN10__cxxabiv123__fundamental_type_infoE = dllexport unnamed_addr constant
+// FUND-DEF: @_ZTSN10__cxxabiv123__fundamental_type_infoE = constant
+// FUND-HID: @_ZTSN10__cxxabiv123__fundamental_type_infoE = hidden constant
+// FUND-EXP: @_ZTSN10__cxxabiv123__fundamental_type_infoE = dllexport constant
+// FUND-DEF: @_ZTIN10__cxxabiv123__fundamental_type_infoE = constant
+// FUND-HID: @_ZTIN10__cxxabiv123__fundamental_type_infoE = hidden constant
+// FUND-EXP: @_ZTIN10__cxxabiv123__fundamental_type_infoE = dllexport constant
+
+// void
+// FUND-DEF: @_ZTSv = constant
+// FUND-HID: @_ZTSv = hidden constant
+// FUND-EXP: @_ZTSv = dllexport constant
+// FUND-DEF: @_ZTIv = constant
+// FUND-HID: @_ZTIv = hidden constant
+// FUND-EXP: @_ZTIv = dllexport constant
+// FUND-DEF: @_ZTSPv = constant
+// FUND-HID: @_ZTSPv = hidden constant
+// FUND-EXP: @_ZTSPv = dllexport constant
+// FUND-DEF: @_ZTIPv = constant
+// FUND-HID: @_ZTIPv = hidden constant
+// FUND-EXP: @_ZTIPv = dllexport constant
+// FUND-DEF: @_ZTSPKv = constant
+// FUND-HID: @_ZTSPKv = hidden constant
+// FUND-EXP: @_ZTSPKv = dllexport constant
+// FUND-DEF: @_ZTIPKv = constant
+// FUND-HID: @_ZTIPKv = hidden constant
+// FUND-EXP: @_ZTIPKv = dllexport constant
+
+// std::nullptr_t
+// FUND-DEF: @_ZTSDn = constant
+// FUND-HID: @_ZTSDn = hidden constant
+// FUND-EXP: @_ZTSDn = dllexport constant
+// FUND-DEF: @_ZTIDn = constant
+// FUND-HID: @_ZTIDn = hidden constant
+// FUND-EXP: @_ZTIDn = dllexport constant
+// FUND-DEF: @_ZTSPDn = constant
+// FUND-HID: @_ZTSPDn = hidden constant
+// FUND-EXP: @_ZTSPDn = dllexport constant
+// FUND-DEF: @_ZTIPDn = constant
+// FUND-HID: @_ZTIPDn = hidden constant
+// FUND-EXP: @_ZTIPDn = dllexport constant
+// FUND-DEF: @_ZTSPKDn = constant
+// FUND-HID: @_ZTSPKDn = hidden constant
+// FUND-EXP: @_ZTSPKDn = dllexport constant
+// FUND-DEF: @_ZTIPKDn = constant
+// FUND-HID: @_ZTIPKDn = hidden constant
+// FUND-EXP: @_ZTIPKDn = dllexport constant
+
+// bool
+// FUND-DEF: @_ZTSb = constant
+// FUND-HID: @_ZTSb = hidden constant
+// FUND-EXP: @_ZTSb = dllexport constant
+// FUND-DEF: @_ZTIb = constant
+// FUND-HID: @_ZTIb = hidden constant
+// FUND-EXP: @_ZTIb = dllexport constant
+// FUND-DEF: @_ZTSPb = constant
+// FUND-HID: @_ZTSPb = hidden constant
+// FUND-EXP: @_ZTSPb = dllexport constant
+// FUND-DEF: @_ZTIPb = constant
+// FUND-HID: @_ZTIPb = hidden constant
+// FUND-EXP: @_ZTIPb = dllexport constant
+// FUND-DEF: @_ZTSPKb = constant
+// FUND-HID: @_ZTSPKb = hidden constant
+// FUND-EXP: @_ZTSPKb = dllexport constant
+// FUND-DEF: @_ZTIPKb = constant
+// FUND-HID: @_ZTIPKb = hidden constant
+// FUND-EXP: @_ZTIPKb = dllexport constant
+
+// wchar_t
+// FUND-DEF: @_ZTSw = constant
+// FUND-HID: @_ZTSw = hidden constant
+// FUND-EXP: @_ZTSw = dllexport constant
+// FUND-DEF: @_ZTIw = constant
+// FUND-HID: @_ZTIw = hidden constant
+// FUND-EXP: @_ZTIw = dllexport constant
+// FUND-DEF: @_ZTSPw = constant
+// FUND-HID: @_ZTSPw = hidden constant
+// FUND-EXP: @_ZTSPw = dllexport constant
+// FUND-DEF: @_ZTIPw = constant
+// FUND-HID: @_ZTIPw = hidden constant
+// FUND-EXP: @_ZTIPw = dllexport constant
+// FUND-DEF: @_ZTSPKw = constant
+// FUND-HID: @_ZTSPKw = hidden constant
+// FUND-EXP: @_ZTSPKw = dllexport constant
+// FUND-DEF: @_ZTIPKw = constant
+// FUND-HID: @_ZTIPKw = hidden constant
+// FUND-EXP: @_ZTIPKw = dllexport constant
+
+// char
+// FUND-DEF: @_ZTSc = constant
+// FUND-HID: @_ZTSc = hidden constant
+// FUND-EXP: @_ZTSc = dllexport constant
+// FUND-DEF: @_ZTIc = constant
+// FUND-HID: @_ZTIc = hidden constant
+// FUND-EXP: @_ZTIc = dllexport constant
+// FUND-DEF: @_ZTSPc = constant
+// FUND-HID: @_ZTSPc = hidden constant
+// FUND-EXP: @_ZTSPc = dllexport constant
+// FUND-DEF: @_ZTIPc = constant
+// FUND-HID: @_ZTIPc = hidden constant
+// FUND-EXP: @_ZTIPc = dllexport constant
+// FUND-DEF: @_ZTSPKc = constant
+// FUND-HID: @_ZTSPKc = hidden constant
+// FUND-EXP: @_ZTSPKc = dllexport constant
+// FUND-DEF: @_ZTIPKc = constant
+// FUND-HID: @_ZTIPKc = hidden constant
+// FUND-EXP: @_ZTIPKc = dllexport constant
+
+// unsigned char
+// FUND-DEF: @_ZTSh = constant
+// FUND-HID: @_ZTSh = hidden constant
+// FUND-EXP: @_ZTSh = dllexport constant
+// FUND-DEF: @_ZTIh = constant
+// FUND-HID: @_ZTIh = hidden constant
+// FUND-EXP: @_ZTIh = dllexport constant
+// FUND-DEF: @_ZTSPh = constant
+// FUND-HID: @_ZTSPh = hidden constant
+// FUND-EXP: @_ZTSPh = dllexport constant
+// FUND-DEF: @_ZTIPh = constant
+// FUND-HID: @_ZTIPh = hidden constant
+// FUND-EXP: @_ZTIPh = dllexport constant
+// FUND-DEF: @_ZTSPKh = constant
+// FUND-HID: @_ZTSPKh = hidden constant
+// FUND-EXP: @_ZTSPKh = dllexport constant
+// FUND-DEF: @_ZTIPKh = constant
+// FUND-HID: @_ZTIPKh = hidden constant
+// FUND-EXP: @_ZTIPKh = dllexport constant
+
+// signed char
+// FUND-DEF: @_ZTSa = constant
+// FUND-HID: @_ZTSa = hidden constant
+// FUND-EXP: @_ZTSa = dllexport constant
+// FUND-DEF: @_ZTIa = constant
+// FUND-HID: @_ZTIa = hidden constant
+// FUND-EXP: @_ZTIa = dllexport constant
+// FUND-DEF: @_ZTSPa = constant
+// FUND-HID: @_ZTSPa = hidden constant
+// FUND-EXP: @_ZTSPa = dllexport constant
+// FUND-DEF: @_ZTIPa = constant
+// FUND-HID: @_ZTIPa = hidden constant
+// FUND-EXP: @_ZTIPa = dllexport constant
+// FUND-DEF: @_ZTSPKa = constant
+// FUND-HID: @_ZTSPKa = hidden constant
+// FUND-EXP: @_ZTSPKa = dllexport constant
+// FUND-DEF: @_ZTIPKa = constant
+// FUND-HID: @_ZTIPKa = hidden constant
+// FUND-EXP: @_ZTIPKa = dllexport constant
+
+// short
+// FUND-DEF: @_ZTSs = constant
+// FUND-HID: @_ZTSs = hidden constant
+// FUND-EXP: @_ZTSs = dllexport constant
+// FUND-DEF: @_ZTIs = constant
+// FUND-HID: @_ZTIs = hidden constant
+// FUND-EXP: @_ZTIs = dllexport constant
+// FUND-DEF: @_ZTSPs = constant
+// FUND-HID: @_ZTSPs = hidden constant
+// FUND-EXP: @_ZTSPs = dllexport constant
+// FUND-DEF: @_ZTIPs = constant
+// FUND-HID: @_ZTIPs = hidden constant
+// FUND-EXP: @_ZTIPs = dllexport constant
+// FUND-DEF: @_ZTSPKs = constant
+// FUND-HID: @_ZTSPKs = hidden constant
+// FUND-EXP: @_ZTSPKs = dllexport constant
+// FUND-DEF: @_ZTIPKs = constant
+// FUND-HID: @_ZTIPKs = hidden constant
+// FUND-EXP: @_ZTIPKs = dllexport constant
+
+// unsigned short
+// FUND-DEF: @_ZTSt = constant
+// FUND-HID: @_ZTSt = hidden constant
+// FUND-EXP: @_ZTSt = dllexport constant
+// FUND-DEF: @_ZTIt = constant
+// FUND-HID: @_ZTIt = hidden constant
+// FUND-EXP: @_ZTIt = dllexport constant
+// FUND-DEF: @_ZTSPt = constant
+// FUND-HID: @_ZTSPt = hidden constant
+// FUND-EXP: @_ZTSPt = dllexport constant
+// FUND-DEF: @_ZTIPt = constant
+// FUND-HID: @_ZTIPt = hidden constant
+// FUND-EXP: @_ZTIPt = dllexport constant
+// FUND-DEF: @_ZTSPKt = constant
+// FUND-HID: @_ZTSPKt = hidden constant
+// FUND-EXP: @_ZTSPKt = dllexport constant
+// FUND-DEF: @_ZTIPKt = constant
+// FUND-HID: @_ZTIPKt = hidden constant
+// FUND-EXP: @_ZTIPKt = dllexport constant
+
+// int
+// FUND-DEF: @_ZTSi = constant
+// FUND-HID: @_ZTSi = hidden constant
+// FUND-EXP: @_ZTSi = dllexport constant
+// FUND-DEF: @_ZTIi = constant
+// FUND-HID: @_ZTIi = hidden constant
+// FUND-EXP: @_ZTIi = dllexport constant
+// FUND-DEF: @_ZTSPi = constant
+// FUND-HID: @_ZTSPi = hidden constant
+// FUND-EXP: @_ZTSPi = dllexport constant
+// FUND-DEF: @_ZTIPi = constant
+// FUND-HID: @_ZTIPi = hidden constant
+// FUND-EXP: @_ZTIPi = dllexport constant
+// FUND-DEF: @_ZTSPKi = constant
+// FUND-HID: @_ZTSPKi = hidden constant
+// FUND-EXP: @_ZTSPKi = dllexport constant
+// FUND-DEF: @_ZTIPKi = constant
+// FUND-HID: @_ZTIPKi = hidden constant
+// FUND-EXP: @_ZTIPKi = dllexport constant
+
+// unsigned int
+// FUND-DEF: @_ZTSj = constant
+// FUND-HID: @_ZTSj = hidden constant
+// FUND-EXP: @_ZTSj = dllexport constant
+// FUND-DEF: @_ZTIj = constant
+// FUND-HID: @_ZTIj = hidden constant
+// FUND-EXP: @_ZTIj = dllexport constant
+// FUND-DEF: @_ZTSPj = constant
+// FUND-HID: @_ZTSPj = hidden constant
+// FUND-EXP: @_ZTSPj = dllexport constant
+// FUND-DEF: @_ZTIPj = constant
+// FUND-HID: @_ZTIPj = hidden constant
+// FUND-EXP: @_ZTIPj = dllexport constant
+// FUND-DEF: @_ZTSPKj = constant
+// FUND-HID: @_ZTSPKj = hidden constant
+// FUND-EXP: @_ZTSPKj = dllexport constant
+// FUND-DEF: @_ZTIPKj = constant
+// FUND-HID: @_ZTIPKj = hidden constant
+// FUND-EXP: @_ZTIPKj = dllexport constant
+
+// long
+// FUND-DEF: @_ZTSl = constant
+// FUND-HID: @_ZTSl = hidden constant
+// FUND-EXP: @_ZTSl = dllexport constant
+// FUND-DEF: @_ZTIl = constant
+// FUND-HID: @_ZTIl = hidden constant
+// FUND-EXP: @_ZTIl = dllexport constant
+// FUND-DEF: @_ZTSPl = constant
+// FUND-HID: @_ZTSPl = hidden constant
+// FUND-EXP: @_ZTSPl = dllexport constant
+// FUND-DEF: @_ZTIPl = constant
+// FUND-HID: @_ZTIPl = hidden constant
+// FUND-EXP: @_ZTIPl = dllexport constant
+// FUND-DEF: @_ZTSPKl = constant
+// FUND-HID: @_ZTSPKl = hidden constant
+// FUND-EXP: @_ZTSPKl = dllexport constant
+// FUND-DEF: @_ZTIPKl = constant
+// FUND-HID: @_ZTIPKl = hidden constant
+// FUND-EXP: @_ZTIPKl = dllexport constant
+
+// unsigned long
+// FUND-DEF: @_ZTSm = constant
+// FUND-HID: @_ZTSm = hidden constant
+// FUND-EXP: @_ZTSm = dllexport constant
+// FUND-DEF: @_ZTIm = constant
+// FUND-HID: @_ZTIm = hidden constant
+// FUND-EXP: @_ZTIm = dllexport constant
+// FUND-DEF: @_ZTSPm = constant
+// FUND-HID: @_ZTSPm = hidden constant
+// FUND-EXP: @_ZTSPm = dllexport constant
+// FUND-DEF: @_ZTIPm = constant
+// FUND-HID: @_ZTIPm = hidden constant
+// FUND-EXP: @_ZTIPm = dllexport constant
+// FUND-DEF: @_ZTSPKm = constant
+// FUND-HID: @_ZTSPKm = hidden constant
+// FUND-EXP: @_ZTSPKm = dllexport constant
+// FUND-DEF: @_ZTIPKm = constant
+// FUND-HID: @_ZTIPKm = hidden constant
+// FUND-EXP: @_ZTIPKm = dllexport constant
+
+// long long
+// FUND-DEF: @_ZTSx = constant
+// FUND-HID: @_ZTSx = hidden constant
+// FUND-EXP: @_ZTSx = dllexport constant
+// FUND-DEF: @_ZTIx = constant
+// FUND-HID: @_ZTIx = hidden constant
+// FUND-EXP: @_ZTIx = dllexport constant
+// FUND-DEF: @_ZTSPx = constant
+// FUND-HID: @_ZTSPx = hidden constant
+// FUND-EXP: @_ZTSPx = dllexport constant
+// FUND-DEF: @_ZTIPx = constant
+// FUND-HID: @_ZTIPx = hidden constant
+// FUND-EXP: @_ZTIPx = dllexport constant
+// FUND-DEF: @_ZTSPKx = constant
+// FUND-HID: @_ZTSPKx = hidden constant
+// FUND-EXP: @_ZTSPKx = dllexport constant
+// FUND-DEF: @_ZTIPKx = constant
+// FUND-HID: @_ZTIPKx = hidden constant
+// FUND-EXP: @_ZTIPKx = dllexport constant
+
+// unsigned long long
+// FUND-DEF: @_ZTSy = constant
+// FUND-HID: @_ZTSy = hidden constant
+// FUND-EXP: @_ZTSy = dllexport constant
+// FUND-DEF: @_ZTIy = constant
+// FUND-HID: @_ZTIy = hidden constant
+// FUND-EXP: @_ZTIy = dllexport constant
+// FUND-DEF: @_ZTSPy = constant
+// FUND-HID: @_ZTSPy = hidden constant
+// FUND-EXP: @_ZTSPy = dllexport constant
+// FUND-DEF: @_ZTIPy = constant
+// FUND-HID: @_ZTIPy = hidden constant
+// FUND-EXP: @_ZTIPy = dllexport constant
+// FUND-DEF: @_ZTSPKy = constant
+// FUND-HID: @_ZTSPKy = hidden constant
+// FUND-EXP: @_ZTSPKy = dllexport constant
+// FUND-DEF: @_ZTIPKy = constant
+// FUND-HID: @_ZTIPKy = hidden constant
+// FUND-EXP: @_ZTIPKy = dllexport constant
+
+// __int128
+// FUND-DEF: @_ZTSn = constant
+// FUND-HID: @_ZTSn = hidden constant
+// FUND-EXP: @_ZTSn = dllexport constant
+// FUND-DEF: @_ZTIn = constant
+// FUND-HID: @_ZTIn = hidden constant
+// FUND-EXP: @_ZTIn = dllexport constant
+// FUND-DEF: @_ZTSPn = constant
+// FUND-HID: @_ZTSPn = hidden constant
+// FUND-EXP: @_ZTSPn = dllexport constant
+// FUND-DEF: @_ZTIPn = constant
+// FUND-HID: @_ZTIPn = hidden constant
+// FUND-EXP: @_ZTIPn = dllexport constant
+// FUND-DEF: @_ZTSPKn = constant
+// FUND-HID: @_ZTSPKn = hidden constant
+// FUND-EXP: @_ZTSPKn = dllexport constant
+// FUND-DEF: @_ZTIPKn = constant
+// FUND-HID: @_ZTIPKn = hidden constant
+// FUND-EXP: @_ZTIPKn = dllexport constant
+
+// unsigned __int128
+// FUND-DEF: @_ZTSo = constant
+// FUND-HID: @_ZTSo = hidden constant
+// FUND-EXP: @_ZTSo = dllexport constant
+// FUND-DEF: @_ZTIo = constant
+// FUND-HID: @_ZTIo = hidden constant
+// FUND-EXP: @_ZTIo = dllexport constant
+// FUND-DEF: @_ZTSPo = constant
+// FUND-HID: @_ZTSPo = hidden constant
+// FUND-EXP: @_ZTSPo = dllexport constant
+// FUND-DEF: @_ZTIPo = constant
+// FUND-HID: @_ZTIPo = hidden constant
+// FUND-EXP: @_ZTIPo = dllexport constant
+// FUND-DEF: @_ZTSPKo = constant
+// FUND-HID: @_ZTSPKo = hidden constant
+// FUND-EXP: @_ZTSPKo = dllexport constant
+// FUND-DEF: @_ZTIPKo = constant
+// FUND-HID: @_ZTIPKo = hidden constant
+// FUND-EXP: @_ZTIPKo = dllexport constant
+
+// half
+// FUND-DEF: @_ZTSDh = constant
+// FUND-HID: @_ZTSDh = hidden constant
+// FUND-EXP: @_ZTSDh = dllexport constant
+// FUND-DEF: @_ZTIDh = constant
+// FUND-HID: @_ZTIDh = hidden constant
+// FUND-EXP: @_ZTIDh = dllexport constant
+// FUND-DEF: @_ZTSPDh = constant
+// FUND-HID: @_ZTSPDh = hidden constant
+// FUND-EXP: @_ZTSPDh = dllexport constant
+// FUND-DEF: @_ZTIPDh = constant
+// FUND-HID: @_ZTIPDh = hidden constant
+// FUND-EXP: @_ZTIPDh = dllexport constant
+// FUND-DEF: @_ZTSPKDh = constant
+// FUND-HID: @_ZTSPKDh = hidden constant
+// FUND-EXP: @_ZTSPKDh = dllexport constant
+// FUND-DEF: @_ZTIPKDh = constant
+// FUND-HID: @_ZTIPKDh = hidden constant
+// FUND-EXP: @_ZTIPKDh = dllexport constant
+
+// float
+// FUND-DEF: @_ZTSf = constant
+// FUND-HID: @_ZTSf = hidden constant
+// FUND-EXP: @_ZTSf = dllexport constant
+// FUND-DEF: @_ZTIf = constant
+// FUND-HID: @_ZTIf = hidden constant
+// FUND-EXP: @_ZTIf = dllexport constant
+// FUND-DEF: @_ZTSPf = constant
+// FUND-HID: @_ZTSPf = hidden constant
+// FUND-EXP: @_ZTSPf = dllexport constant
+// FUND-DEF: @_ZTIPf = constant
+// FUND-HID: @_ZTIPf = hidden constant
+// FUND-EXP: @_ZTIPf = dllexport constant
+// FUND-DEF: @_ZTSPKf = constant
+// FUND-HID: @_ZTSPKf = hidden constant
+// FUND-EXP: @_ZTSPKf = dllexport constant
+// FUND-DEF: @_ZTIPKf = constant
+// FUND-HID: @_ZTIPKf = hidden constant
+// FUND-EXP: @_ZTIPKf = dllexport constant
+
+// double
+// FUND-DEF: @_ZTSd = constant
+// FUND-HID: @_ZTSd = hidden constant
+// FUND-EXP: @_ZTSd = dllexport constant
+// FUND-DEF: @_ZTId = constant
+// FUND-HID: @_ZTId = hidden constant
+// FUND-EXP: @_ZTId = dllexport constant
+// FUND-DEF: @_ZTSPd = constant
+// FUND-HID: @_ZTSPd = hidden constant
+// FUND-EXP: @_ZTSPd = dllexport constant
+// FUND-DEF: @_ZTIPd = constant
+// FUND-HID: @_ZTIPd = hidden constant
+// FUND-EXP: @_ZTIPd = dllexport constant
+// FUND-DEF: @_ZTSPKd = constant
+// FUND-HID: @_ZTSPKd = hidden constant
+// FUND-EXP: @_ZTSPKd = dllexport constant
+// FUND-DEF: @_ZTIPKd = constant
+// FUND-HID: @_ZTIPKd = hidden constant
+// FUND-EXP: @_ZTIPKd = dllexport constant
+
+// long double
+// FUND-DEF: @_ZTSe = constant
+// FUND-HID: @_ZTSe = hidden constant
+// FUND-EXP: @_ZTSe = dllexport constant
+// FUND-DEF: @_ZTIe = constant
+// FUND-HID: @_ZTIe = hidden constant
+// FUND-EXP: @_ZTIe = dllexport constant
+// FUND-DEF: @_ZTSPe = constant
+// FUND-HID: @_ZTSPe = hidden constant
+// FUND-EXP: @_ZTSPe = dllexport constant
+// FUND-DEF: @_ZTIPe = constant
+// FUND-HID: @_ZTIPe = hidden constant
+// FUND-EXP: @_ZTIPe = dllexport constant
+// FUND-DEF: @_ZTSPKe = constant
+// FUND-HID: @_ZTSPKe = hidden constant
+// FUND-EXP: @_ZTSPKe = dllexport constant
+// FUND-DEF: @_ZTIPKe = constant
+// FUND-HID: @_ZTIPKe = hidden constant
+// FUND-EXP: @_ZTIPKe = dllexport constant
+
+// __ieee128
+// FUND-DEF: @_ZTSu9__ieee128 = constant
+// FUND-HID: @_ZTSu9__ieee128 = hidden constant
+// FUND-EXP: @_ZTSu9__ieee128 = dllexport constant
+// FUND-DEF: @_ZTIu9__ieee128 = constant
+// FUND-HID: @_ZTIu9__ieee128 = hidden constant
+// FUND-EXP: @_ZTIu9__ieee128 = dllexport constant
+// FUND-DEF: @_ZTSPu9__ieee128 = constant
+// FUND-HID: @_ZTSPu9__ieee128 = hidden constant
+// FUND-EXP: @_ZTSPu9__ieee128 = dllexport constant
+// FUND-DEF: @_ZTIPu9__ieee128 = constant
+// FUND-HID: @_ZTIPu9__ieee128 = hidden constant
+// FUND-EXP: @_ZTIPu9__ieee128 = dllexport constant
+// FUND-DEF: @_ZTSPKu9__ieee128 = constant
+// FUND-HID: @_ZTSPKu9__ieee128 = hidden constant
+// FUND-EXP: @_ZTSPKu9__ieee128 = dllexport constant
+// FUND-DEF: @_ZTIPKu9__ieee128 = constant
+// FUND-HID: @_ZTIPKu9__ieee128 = hidden constant
+// FUND-EXP: @_ZTIPKu9__ieee128 = dllexport constant
+
+// char8_t
+// FUND-DEF: @_ZTSDu = constant
+// FUND-HID: @_ZTSDu = hidden constant
+// FUND-EXP: @_ZTSDu = dllexport constant
+// FUND-DEF: @_ZTIDu = constant
+// FUND-HID: @_ZTIDu = hidden constant
+// FUND-EXP: @_ZTIDu = dllexport constant
+// FUND-DEF: @_ZTSPDu = constant
+// FUND-HID: @_ZTSPDu = hidden constant
+// FUND-EXP: @_ZTSPDu = dllexport constant
+// FUND-DEF: @_ZTIPDu = constant
+// FUND-HID: @_ZTIPDu = hidden constant
+// FUND-EXP: @_ZTIPDu = dllexport constant
+// FUND-DEF: @_ZTSPKDu = constant
+// FUND-HID: @_ZTSPKDu = hidden constant
+// FUND-EXP: @_ZTSPKDu = dllexport constant
+// FUND-DEF: @_ZTIPKDu = constant
+// FUND-HID: @_ZTIPKDu = hidden constant
+// FUND-EXP: @_ZTIPKDu = dllexport constant
+
+// char16_t
+// FUND-DEF: @_ZTSDs = constant
+// FUND-HID: @_ZTSDs = hidden constant
+// FUND-EXP: @_ZTSDs = dllexport constant
+// FUND-DEF: @_ZTIDs = constant
+// FUND-HID: @_ZTIDs = hidden constant
+// FUND-EXP: @_ZTIDs = dllexport constant
+// FUND-DEF: @_ZTSPDs = constant
+// FUND-HID: @_ZTSPDs = hidden constant
+// FUND-EXP: @_ZTSPDs = dllexport constant
+// FUND-DEF: @_ZTIPDs = constant
+// FUND-HID: @_ZTIPDs = hidden constant
+// FUND-EXP: @_ZTIPDs = dllexport constant
+// FUND-DEF: @_ZTSPKDs = constant
+// FUND-HID: @_ZTSPKDs = hidden constant
+// FUND-EXP: @_ZTSPKDs = dllexport constant
+// FUND-DEF: @_ZTIPKDs = constant
+// FUND-HID: @_ZTIPKDs = hidden constant
+// FUND-EXP: @_ZTIPKDs = dllexport constant
+
+// char32_t
+// FUND-DEF: @_ZTSDi = constant
+// FUND-HID: @_ZTSDi = hidden constant
+// FUND-EXP: @_ZTSDi = dllexport constant
+// FUND-DEF: @_ZTIDi = constant
+// FUND-HID: @_ZTIDi = hidden constant
+// FUND-EXP: @_ZTIDi = dllexport constant
+// FUND-DEF: @_ZTSPDi = constant
+// FUND-HID: @_ZTSPDi = hidden constant
+// FUND-EXP: @_ZTSPDi = dllexport constant
+// FUND-DEF: @_ZTIPDi = constant
+// FUND-HID: @_ZTIPDi = hidden constant
+// FUND-EXP: @_ZTIPDi = dllexport constant
+// FUND-DEF: @_ZTSPKDi = constant
+// FUND-HID: @_ZTSPKDi = hidden constant
+// FUND-EXP: @_ZTSPKDi = dllexport constant
+// FUND-DEF: @_ZTIPKDi = constant
+// FUND-HID: @_ZTIPKDi = hidden constant
+// FUND-EXP: @_ZTIPKDi = dllexport constant
Index: clang/test/CodeGenCXX/mdefault-visibility-export-mapping.cpp
===================================================================
--- /dev/null
+++ clang/test/CodeGenCXX/mdefault-visibility-export-mapping.cpp
@@ -0,0 +1,100 @@
+// RUN: %clang_cc1 -triple powerpc-ibm-aix %s -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=CHECK,UNSPECIFIED-DEF,EXPLICIT-DEF %s
+// RUN: %clang_cc1 -triple powerpc-ibm-aix %s -mdefault-visibility-export-mapping=none -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=CHECK,UNSPECIFIED-DEF,EXPLICIT-DEF %s
+// RUN: %clang_cc1 -triple powerpc-ibm-aix %s -mdefault-visibility-export-mapping=explicit -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=CHECK,UNSPECIFIED-DEF,EXPLICIT-EXP %s
+// RUN: %clang_cc1 -triple powerpc-ibm-aix %s -mdefault-visibility-export-mapping=all -S -emit-llvm -o - | \
+// RUN:   FileCheck -check-prefixes=CHECK,UNSPECIFIED-EXP,EXPLICIT-EXP %s
+
+struct A {};
+
+template <class T>
+class B {
+public:
+  T x;
+  B(T _x) : x(_x) {}
+  ~B() {}
+  void func(T x) {}
+};
+
+template <class T>
+class __attribute__((visibility("default"))) C {
+public:
+  T x;
+  C(T _x) : x(_x) {}
+  ~C() {}
+  void func(T x) {}
+};
+
+extern template class B<int>;
+extern template class C<int>;
+
+// UNSPECIFIED-DEF: define void @_Z4funcv
+// UNSPECIFIED-EXP: define dllexport void @_Z4funcv
+void func() {
+  B<A> x({});
+  C<A> y({});
+  x.func({}); y.func({});
+  B<int> xi(0);
+  C<int> yi(0);
+  xi.func(0); yi.func(0);
+}
+
+// B<A>::B(A) (complete object constructor)
+// UNSPECIFIED-DEF: define linkonce_odr void @_ZN1BI1AEC1ES0_
+// UNSPECIFIED-EXP: define linkonce_odr dllexport void @_ZN1BI1AEC1ES0_
+
+// C<A>::C(A) (complete object constructor)
+// EXPLICIT-DEF: define linkonce_odr void @_ZN1CI1AEC1ES0_
+// EXPLICIT-EXP: define linkonce_odr dllexport void @_ZN1CI1AEC1ES0_
+
+// B<A>::func(A)
+// UNSPECIFIED-DEF: define linkonce_odr void @_ZN1BI1AE4funcES0_
+// UNSPECIFIED-EXP: define linkonce_odr dllexport void @_ZN1BI1AE4funcES0_
+
+// C<A>::func(A)
+// EXPLICIT-DEF: define linkonce_odr void @_ZN1CI1AE4funcES0_
+// EXPLICIT-EXP: define linkonce_odr dllexport void @_ZN1CI1AE4funcES0_
+
+// B<int>::B(int) (complete object constructor)
+// CHECK: declare void @_ZN1BIiEC1Ei
+
+// C<int>::C(int) (complete object constructor)
+// CHECK: declare void @_ZN1CIiEC1Ei
+
+// B<int>::func(int)
+// CHECK: declare void @_ZN1BIiE4funcEi
+
+// C<int>::func(int)
+// CHECK: declare void @_ZN1CIiE4funcEi
+
+// C<int>::~C() (complete object destructor)
+// CHECK: declare void @_ZN1CIiED1Ev
+
+// B<int>::~B() (complete object destructor)
+// CHECK: declare void @_ZN1BIiED1Ev
+
+// C<A>::~c() (complete object destructor)
+// EXPLICIT-DEF: define linkonce_odr void @_ZN1CI1AED1Ev
+// EXPLICIT-EXP: define linkonce_odr dllexport void @_ZN1CI1AED1Ev
+
+// B<A>::~B() (complete object destructor)
+// UNSPECIFIED-DEF: define linkonce_odr void @_ZN1BI1AED1Ev
+// UNSPECIFIED-EXP: define linkonce_odr dllexport void @_ZN1BI1AED1Ev
+
+// B<A>::B(A) (base object constructor)
+// UNSPECIFIED-DEF: define linkonce_odr void @_ZN1BI1AEC2ES0_
+// UNSPECIFIED-EXP: define linkonce_odr dllexport void @_ZN1BI1AEC2ES0_
+
+// B<A>::~B() (base object destructor)
+// UNSPECIFIED-DEF: define linkonce_odr void @_ZN1BI1AED2Ev
+// UNSPECIFIED-EXP: define linkonce_odr dllexport void @_ZN1BI1AED2Ev
+
+// C<A>::C(A) (base object constructor)
+// EXPLICIT-DEF: define linkonce_odr void @_ZN1CI1AEC2ES0_
+// EXPLICIT-EXP: define linkonce_odr dllexport void @_ZN1CI1AEC2ES0_
+
+// C<A>::~C() (base object destructor)
+// EXPLICIT-DEF: define linkonce_odr void @_ZN1CI1AED2Ev
+// EXPLICIT-EXP: define linkonce_odr dllexport void @_ZN1CI1AED2Ev