--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/SemaObjCXX/attr-trivial-abi.mm	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,97 @@
+// RUN: %clang_cc1 -std=c++11 -fobjc-runtime-has-weak -fobjc-weak -fobjc-arc -fsyntax-only -verify %s
+
+void __attribute__((trivial_abi)) foo(); // expected-warning {{'trivial_abi' attribute only applies to classes}}
+
+struct [[clang::trivial_abi]] S0 {
+  int a;
+};
+
+struct __attribute__((trivial_abi)) S1 {
+  int a;
+};
+
+struct __attribute__((trivial_abi)) S2 { // expected-warning {{'trivial_abi' cannot be applied to 'S2'}}
+  __weak id a;
+};
+
+struct __attribute__((trivial_abi)) S3 { // expected-warning {{'trivial_abi' cannot be applied to 'S3'}}
+  virtual void m();
+};
+
+struct S3_2 {
+  virtual void m();
+} __attribute__((trivial_abi)); // expected-warning {{'trivial_abi' cannot be applied to 'S3_2'}}
+
+struct S4 {
+  int a;
+};
+
+struct __attribute__((trivial_abi)) S5 : public virtual S4 { // expected-warning {{'trivial_abi' cannot be applied to 'S5'}}
+};
+
+struct __attribute__((trivial_abi)) S9 : public S4 {
+};
+
+struct S6 {
+  __weak id a;
+};
+
+struct __attribute__((trivial_abi)) S12 { // expected-warning {{'trivial_abi' cannot be applied to 'S12'}}
+  __weak id a;
+};
+
+struct __attribute__((trivial_abi)) S13 { // expected-warning {{'trivial_abi' cannot be applied to 'S13'}}
+  __weak id a[2];
+};
+
+struct __attribute__((trivial_abi)) S7 { // expected-warning {{'trivial_abi' cannot be applied to 'S7'}}
+  S6 a;
+};
+
+struct __attribute__((trivial_abi)) S11 { // expected-warning {{'trivial_abi' cannot be applied to 'S11'}}
+  S6 a[2];
+};
+
+struct __attribute__((trivial_abi(1))) S8 { // expected-error {{'trivial_abi' attribute takes no arguments}}
+  int a;
+};
+
+// Do not warn when 'trivial_abi' is used to annotate a template class.
+template<class T>
+struct __attribute__((trivial_abi)) S10 {
+  T p;
+};
+
+S10<int *> p1;
+S10<__weak id> p2;
+
+template<>
+struct __attribute__((trivial_abi)) S10<id> { // expected-warning {{'trivial_abi' cannot be applied to 'S10<id>'}}
+  __weak id a;
+};
+
+template<class T>
+struct S14 {
+  T a;
+  __weak id b;
+};
+
+template<class T>
+struct __attribute__((trivial_abi)) S15 : S14<T> {
+};
+
+S15<int> s15;
+
+template<class T>
+struct __attribute__((trivial_abi)) S16 {
+  S14<T> a;
+};
+
+S16<int> s16;
+
+template<class T>
+struct __attribute__((trivial_abi)) S17 { // expected-warning {{'trivial_abi' cannot be applied to 'S17'}}
+  __weak id a;
+};
+
+S17<int> s17;