Fix the bug that was breaking self-host, and re-land the static ctor fixes.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@95400 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGExprConstant.cpp

@@ -675,9 +675,20 @@ public:
     if (!E->getConstructor()->isTrivial())
       return 0;
 
+    QualType Ty = E->getType();
+
+    // FIXME: We should not have to call getBaseElementType here.
+    const RecordType *RT = 
+      CGM.getContext().getBaseElementType(Ty)->getAs<RecordType>();
+    const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
+    
+    // If the class doesn't have a trivial destructor, we can't emit it as a
+    // constant expr.
+    if (!RD->hasTrivialDestructor())
+      return 0;
+    
     // Only copy and default constructors can be trivial.
 
-    QualType Ty = E->getType();
 
     if (E->getNumArgs()) {
       assert(E->getNumArgs() == 1 && "trivial ctor with > 1 argument");

test/CodeGenCXX/global-init.cpp

@@ -9,6 +9,8 @@ struct B { B(); ~B(); };
 
 struct C { void *field; };
 
+struct D { ~D(); };
+
 // CHECK: @c = global %struct.C zeroinitializer, align 8
 
 // CHECK: call void @_ZN1AC1Ev(%struct.A* @a)
@@ -23,4 +25,7 @@ B b;
 // CHECK-NOT: call void @_ZN1CC1Ev(%struct.C* @c)
 C c;
 
+// CHECK: call i32 @__cxa_atexit(void (i8*)* bitcast (void (%struct.A*)* @_ZN1DD1Ev to void (i8*)*), i8* getelementptr inbounds (%struct.A* @d, i32 0, i32 0), i8* bitcast (i8** @__dso_handle to i8*))
+D d;
+
 // CHECK: define internal void @__cxx_global_initialization() {