[PATCH] Don't dllimport/export class members with internal linkage (PR23308)

[Hans Wennborg]

Hi thakis, rnk, majnemer,

For example, a function taking a parameter with internal linkage will
itself have internal linkage since it cannot be called outside the
translation unit.

http://reviews.llvm.org/D9182

Files:
  lib/Sema/SemaDeclCXX.cpp
  test/CodeGenCXX/dllexport.cpp
  test/SemaCXX/dllexport.cpp

Index: lib/Sema/SemaDeclCXX.cpp
===================================================================
--- lib/Sema/SemaDeclCXX.cpp
+++ lib/Sema/SemaDeclCXX.cpp
@@ -4804,6 +4804,10 @@
       }
     }
 
+    if (!cast<NamedDecl>(Member)->isExternallyVisible()) {
+      continue;
+    }
+
     if (!getDLLAttr(Member)) {
       auto *NewAttr =
           cast<InheritableAttr>(ClassAttr->clone(S.getASTContext()));
Index: test/CodeGenCXX/dllexport.cpp
===================================================================
--- test/CodeGenCXX/dllexport.cpp
+++ test/CodeGenCXX/dllexport.cpp
@@ -691,6 +691,15 @@
 USEMEMFUNC(ExplicitInstantiationDeclExportedTemplate<int>, f);
 // M32-DAG: {{declare|define available_externally}} x86_thiscallcc void @"\01?f@?$ExplicitInstantiationDeclExportedTemplate at H@@QAEXXZ"
 
+namespace { struct InternalLinkageType {}; }
+struct __declspec(dllexport) PR23308 {
+  void f(InternalLinkageType*);
+};
+void PR23308::f(InternalLinkageType*) {}
+long use(PR23308* p) { p->f(nullptr); }
+// M32-DAG: define internal x86_thiscallcc void @"\01?f at PR23308@@QAEXPAUInternalLinkageType@?A@@@Z"
+
+
 
 //===----------------------------------------------------------------------===//
 // Classes with template base classes
Index: test/SemaCXX/dllexport.cpp
===================================================================
--- test/SemaCXX/dllexport.cpp
+++ test/SemaCXX/dllexport.cpp
@@ -393,6 +393,12 @@
 template <typename T> struct __declspec(dllexport) ExplicitInstantiationDeclExportedTemplate {}; // expected-note{{attribute is here}}
 extern template struct ExplicitInstantiationDeclExportedTemplate<int>; // expected-warning{{explicit instantiation declaration should not be 'dllexport'}}
 
+namespace { struct InternalLinkageType {}; }
+struct __declspec(dllexport) PR23308 {
+  void f(InternalLinkageType*);
+};
+void PR23308::f(InternalLinkageType*) {} // No error; we don't try to export f because it has internal linkage.
+
 //===----------------------------------------------------------------------===//
 // Classes with template base classes
 //===----------------------------------------------------------------------===//

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