Fix a regression that allowed clearly ill formed code. The diagnostic is still

terrible, FIXME left to do a proper job of diagnosing this.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@112581 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 22 insertions, 0 deletions

diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index fdffa04037..4b116890fa 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -6135,6 +6135,8 @@ FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
       CXXRecord->setPOD(false);
     if (!ZeroWidth)
       CXXRecord->setEmpty(false);
+    if (T->isReferenceType())
+      CXXRecord->setHasTrivialConstructor(false);
 
     if (const RecordType *RT = EltTy->getAs<RecordType>()) {
       CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
diff --git a/test/CXX/dcl.decl/dcl.init/p5.cpp b/test/CXX/dcl.decl/dcl.init/p5.cpp
new file mode 100644
index 0000000000..b50e8d780c
--- /dev/null
+++ b/test/CXX/dcl.decl/dcl.init/p5.cpp
@@ -0,0 +1,20 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+// FIXME: Very incomplete!
+
+//   A program that calls for default-initialization or value-initialization of
+//   an entity of reference type is illformed. If T is a cv-qualified type, the
+//   cv-unqualified version of T is used for these definitions of
+//   zero-initialization, default-initialization, and value-initialization.
+//
+// FIXME: The diagnostics for these errors are terrible because they fall out
+// of the AST representation rather than being explicitly issued during the
+// respective initialization forms.
+struct S { // expected-error {{implicit default constructor for 'S' must explicitly initialize the reference member}} \
+           // expected-note {{candidate constructor (the implicit copy constructor) not viable}}
+  int& x; // expected-note {{declared here}}
+};
+S s; // expected-note {{implicit default constructor for 'S' first required here}}
+S f() {
+  return S(); // expected-error {{no matching constructor for initialization of 'S'}}
+}