Do not parse members of incomplete class.

If definition of a class is unknown and out-of-line definition of its
member is encountered, do not parse the member declaration.
This change fixes PR18542.

Differential Revision: http://reviews.llvm.org/D8010

llvm-svn: 239483

1 files changed, 4 insertions, 2 deletions

diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 047958e2fc2..1c0eea72dd8 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -4663,12 +4663,14 @@ NamedDecl *Sema::HandleDeclarator(Scope *S, Declarator &D,
         RequireCompleteDeclContext(D.getCXXScopeSpec(), DC))
       return nullptr;
 
+    // If a class is incomplete, do not parse entities inside it.
     if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) {
       Diag(D.getIdentifierLoc(),
            diag::err_member_def_undefined_record)
         << Name << DC << D.getCXXScopeSpec().getRange();
-      D.setInvalidType();
-    } else if (!D.getDeclSpec().isFriendSpecified()) {
+      return nullptr;
+    }
+    if (!D.getDeclSpec().isFriendSpecified()) {
       if (diagnoseQualifiedDeclaration(D.getCXXScopeSpec(), DC,
                                       Name, D.getIdentifierLoc())) {
         if (DC->isRecord())