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diff --git a/clang/test/SemaCXX/attr-require-constant-initialization.cpp b/clang/test/SemaCXX/attr-require-constant-initialization.cpp
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+++ b/clang/test/SemaCXX/attr-require-constant-initialization.cpp
@@ -0,0 +1,282 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -DTEST_ONE -std=c++03 %s
+// RUN: %clang_cc1 -fsyntax-only -verify -DTEST_ONE -std=c++11 %s
+// RUN: %clang_cc1 -fsyntax-only -verify -DTEST_ONE -std=c++14 %s
+// RUN: %clang_cc1 -fsyntax-only -verify -DTEST_TWO \
+// RUN: -Wglobal-constructors -std=c++14 %s
+// RUN: %clang_cc1 -fsyntax-only -verify -DTEST_THREE -xc %s
+
+#define ATTR __attribute__((require_constant_initialization)) // expected-note 0+ {{expanded from macro}}
+
+int ReturnInt();
+
+struct PODType {
+  int value;
+  int value2;
+};
+
+#if defined(__cplusplus)
+
+#if __cplusplus >= 201103L
+struct LitType {
+  constexpr LitType() : value(0) {}
+  constexpr LitType(int x) : value(x) {}
+  LitType(void *) : value(-1) {}
+  int value;
+};
+#endif
+
+struct NonLit {
+#if __cplusplus >= 201402L
+  constexpr NonLit() : value(0) {}
+  constexpr NonLit(int x) : value(x) {}
+#else
+  NonLit() : value(0) {}
+  NonLit(int x) : value(x) {}
+#endif
+  NonLit(void *) : value(-1) {}
+  ~NonLit() {}
+  int value;
+};
+
+struct StoresNonLit {
+#if __cplusplus >= 201402L
+  constexpr StoresNonLit() : obj() {}
+  constexpr StoresNonLit(int x) : obj(x) {}
+#else
+  StoresNonLit() : obj() {}
+  StoresNonLit(int x) : obj(x) {}
+#endif
+  StoresNonLit(void *p) : obj(p) {}
+  NonLit obj;
+};
+
+#endif // __cplusplus
+
+
+#if defined(TEST_ONE) // Test semantics of attribute
+
+// Test diagnostics when attribute is applied to non-static declarations.
+void test_func_local(ATTR int param) { // expected-error {{only applies to variables with static or thread}}
+  ATTR int x = 42;                     // expected-error {{only applies to variables with static or thread}}
+  ATTR extern int y;
+}
+struct ATTR class_mem { // expected-error {{only applies to variables with static or thread}}
+  ATTR int x;           // expected-error {{only applies to variables with static or thread}}
+};
+
+// [basic.start.static]p2.1
+// if each full-expression (including implicit conversions) that appears in
+// the initializer of a reference with static or thread storage duration is
+// a constant expression (5.20) and the reference is bound to a glvalue
+// designating an object with static storage duration, to a temporary object
+// (see 12.2) or subobject thereof, or to a function;
+
+// Test binding to a static glvalue
+const int glvalue_int = 42;
+const int glvalue_int2 = ReturnInt();
+ATTR const int &glvalue_ref ATTR = glvalue_int;
+ATTR const int &glvalue_ref2 ATTR = glvalue_int2;
+ATTR __thread const int &glvalue_ref_tl = glvalue_int;
+
+void test_basic_start_static_2_1() {
+  const int non_global = 42;
+  ATTR static const int &local_init = non_global; // expected-error {{variable does not have a constant initializer}}
+  // expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+  ATTR static const int &global_init = glvalue_int;
+  ATTR static const int &temp_init = 42;
+}
+
+ATTR const int &temp_ref = 42;
+ATTR const int &temp_ref2 = ReturnInt(); // expected-error {{variable does not have a constant initializer}}
+// expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+ATTR const NonLit &nl_temp_ref = 42; // expected-error {{variable does not have a constant initializer}}
+// expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+
+#if __cplusplus >= 201103L
+ATTR const LitType &lit_temp_ref = 42;
+ATTR const int &subobj_ref = LitType{}.value;
+#endif
+
+ATTR const int &nl_subobj_ref = NonLit().value; // expected-error {{variable does not have a constant initializer}}
+// expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+
+struct TT1 {
+  ATTR static const int &no_init;
+  ATTR static const int &glvalue_init;
+  ATTR static const int &temp_init;
+  ATTR static const int &subobj_init;
+#if __cplusplus >= 201103L
+  ATTR static thread_local const int &tl_glvalue_init;
+  ATTR static thread_local const int &tl_temp_init; // expected-note {{required by 'require_constant_initializer' attribute here}}
+#endif
+};
+const int &TT1::glvalue_init = glvalue_int;
+const int &TT1::temp_init = 42;
+const int &TT1::subobj_init = PODType().value;
+#if __cplusplus >= 201103L
+thread_local const int &TT1::tl_glvalue_init = glvalue_int;
+thread_local const int &TT1::tl_temp_init = 42; // expected-error {{variable does not have a constant initializer}}
+#endif
+
+// [basic.start.static]p2.2
+// if an object with static or thread storage duration is initialized by a
+// constructor call, and if the initialization full-expression is a constant
+// initializer for the object;
+
+void test_basic_start_static_2_2() {
+#if __cplusplus < 201103L
+  ATTR static PODType pod;
+#else
+  ATTR static PODType pod; // expected-error {{variable does not have a constant initializer}}
+// expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+#endif
+  ATTR static PODType pot2 = {ReturnInt()}; // expected-error {{variable does not have a constant initializer}}
+                                            // expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+
+#if __cplusplus >= 201103L
+  constexpr LitType l;
+  ATTR static LitType static_lit = l;
+  ATTR static LitType static_lit2 = (void *)0; // expected-error {{variable does not have a constant initializer}}
+  // expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+  ATTR static LitType static_lit3 = ReturnInt(); // expected-error {{variable does not have a constant initializer}}
+  // expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+  ATTR thread_local LitType tls = 42;
+#endif
+}
+
+struct TT2 {
+  ATTR static PODType pod_noinit;
+#if __cplusplus >= 201103L
+// expected-note@-2 {{required by 'require_constant_initializer' attribute here}}
+#endif
+  ATTR static PODType pod_copy_init; // expected-note {{required by 'require_constant_initializer' attribute here}}
+#if __cplusplus >= 201402L
+  ATTR static constexpr LitType lit = {};
+  ATTR static const NonLit non_lit;
+  ATTR static const NonLit non_lit_list_init;
+  ATTR static const NonLit non_lit_copy_init; // expected-note {{required by 'require_constant_initializer' attribute here}}
+#endif
+};
+PODType TT2::pod_noinit;
+#if __cplusplus >= 201103L
+// expected-error@-2 {{variable does not have a constant initializer}}
+#endif
+PODType TT2::pod_copy_init(TT2::pod_noinit); // expected-error {{variable does not have a constant initializer}}
+#if __cplusplus >= 201402L
+const NonLit TT2::non_lit(42);
+const NonLit TT2::non_lit_list_init = {42};
+const NonLit TT2::non_lit_copy_init = 42; // expected-error {{variable does not have a constant initializer}}
+#endif
+
+#if __cplusplus >= 201103L
+ATTR LitType lit_ctor;
+ATTR LitType lit_ctor2{};
+ATTR LitType lit_ctor3 = {};
+ATTR __thread LitType lit_ctor_tl = {};
+
+#if __cplusplus >= 201402L
+ATTR NonLit nl_ctor;
+ATTR NonLit nl_ctor2{};
+ATTR NonLit nl_ctor3 = {};
+ATTR thread_local NonLit nl_ctor_tl = {};
+ATTR StoresNonLit snl;
+#else
+ATTR NonLit nl_ctor; // expected-error {{variable does not have a constant initializer}}
+// expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+ATTR NonLit nl_ctor2{}; // expected-error {{variable does not have a constant initializer}}
+// expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+ATTR NonLit nl_ctor3 = {}; // expected-error {{variable does not have a constant initializer}}
+// expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+ATTR thread_local NonLit nl_ctor_tl = {}; // expected-error {{variable does not have a constant initializer}}
+// expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+ATTR StoresNonLit snl; // expected-error {{variable does not have a constant initializer}}
+// expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+#endif
+
+// Non-literal types cannot appear in the initializer of a non-literal type.
+ATTR int nl_in_init = NonLit{42}.value; // expected-error {{variable does not have a constant initializer}}
+// expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+ATTR int lit_in_init = LitType{42}.value;
+#endif
+
+// [basic.start.static]p2.3
+// if an object with static or thread storage duration is not initialized by a
+// constructor call and if either the object is value-initialized or every
+// full-expression that appears in its initializer is a constant expression.
+void test_basic_start_static_2_3() {
+  ATTR static int static_local = 42;
+  ATTR static int static_local2; // zero-initialization takes place
+#if __cplusplus >= 201103L
+  ATTR thread_local int tl_local = 42;
+#endif
+}
+
+ATTR int no_init; // zero initialization takes place
+ATTR int arg_init = 42;
+ATTR PODType pod_init = {};
+ATTR PODType pod_missing_init = {42 /* should have second arg */};
+ATTR PODType pod_full_init = {1, 2};
+ATTR PODType pod_non_constexpr_init = {1, ReturnInt()}; // expected-error {{variable does not have a constant initializer}}
+// expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+
+#if __cplusplus >= 201103L
+ATTR int val_init{};
+ATTR int brace_init = {};
+#endif
+
+ATTR __thread int tl_init = 0;
+typedef const char *StrType;
+
+#if __cplusplus >= 201103L
+
+// Test that the validity of the selected constructor is checked, not just the
+// initializer
+struct NotC {
+  constexpr NotC(void *) {}
+  NotC(int) {}
+};
+template <class T>
+struct TestCtor {
+  constexpr TestCtor(int x) : value(x) {}
+  T value;
+};
+ATTR TestCtor<NotC> t(42); // expected-error {{variable does not have a constant initializer}}
+// expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+#endif
+
+// Test various array types
+ATTR const char *foo[] = {"abc", "def"};
+ATTR PODType bar[] = {{}, {123, 456}};
+
+#elif defined(TEST_TWO) // Test for duplicate warnings
+struct NotC {
+  constexpr NotC(void *) {}
+  NotC(int) {} // expected-note 2 {{declared here}}
+};
+template <class T>
+struct TestCtor {
+  constexpr TestCtor(int x) : value(x) {} // expected-note 2 {{non-constexpr constructor}}
+  T value;
+};
+
+ATTR LitType non_const_lit(nullptr); // expected-error {{variable does not have a constant initializer}}
+// expected-note@-1 {{required by 'require_constant_initializer' attribute here}}
+ATTR NonLit non_const(nullptr); // expected-error {{variable does not have a constant initializer}}
+// expected-warning@-1 {{declaration requires a global destructor}}
+// expected-note@-2 {{required by 'require_constant_initializer' attribute here}}
+LitType const_init_lit(nullptr);              // expected-warning {{declaration requires a global constructor}}
+NonLit const_init{42};                        // expected-warning {{declaration requires a global destructor}}
+constexpr TestCtor<NotC> inval_constexpr(42); // expected-error {{must be initialized by a constant expression}}
+// expected-note@-1 {{in call to 'TestCtor(42)'}}
+ATTR constexpr TestCtor<NotC> inval_constexpr2(42); // expected-error {{must be initialized by a constant expression}}
+// expected-note@-1 {{in call to 'TestCtor(42)'}}
+
+#elif defined(TEST_THREE)
+#if defined(__cplusplus)
+#error This test requires C
+#endif
+// Test that using the attribute in C results in a diagnostic
+ATTR int x = 0; // expected-warning {{attribute ignored}}
+#else
+#error No test case specified
+#endif // defined(TEST_N)