--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Sema/thread-specifier.c	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,136 @@
+// RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -Wno-private-extern -verify -pedantic %s -DGNU
+// RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -Wno-private-extern -verify -pedantic -x c++ %s -DGNU -std=c++98
+// RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -Wno-private-extern -verify -pedantic %s -std=c11 -DC11 -D__thread=_Thread_local
+// RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -Wno-private-extern -verify=expected,thread-local -pedantic -x c++ %s -DC11 -D__thread=_Thread_local -std=c++98
+// RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -Wno-private-extern -verify -pedantic -x c++ %s -DCXX11 -D__thread=thread_local -std=c++11 -Wno-deprecated
+// RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -Wno-private-extern -verify=expected,thread-local -pedantic -x c++ %s -DC11 -D__thread=_Thread_local -std=c++11 -Wno-deprecated
+// RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -Wno-private-extern -verify=expected,thread-local -pedantic %s -std=c99 -D__thread=_Thread_local -DC99
+
+#ifdef __cplusplus
+// In C++, we define __private_extern__ to extern.
+#undef __private_extern__
+#endif
+
+__thread int t1; // thread-local-warning {{'_Thread_local' is a C11 extension}}
+__thread extern int t2; // thread-local-warning {{'_Thread_local' is a C11 extension}}
+__thread static int t3; // thread-local-warning {{'_Thread_local' is a C11 extension}}
+#ifdef GNU
+// expected-warning@-3 {{'__thread' before 'extern'}}
+// expected-warning@-3 {{'__thread' before 'static'}}
+#endif
+
+__thread __private_extern__ int t4; // thread-local-warning {{'_Thread_local' is a C11 extension}}
+struct t5 { __thread int x; }; // thread-local-warning {{'_Thread_local' is a C11 extension}}
+#ifdef __cplusplus
+// expected-error-re@-2 {{'{{__thread|_Thread_local|thread_local}}' is only allowed on variable declarations}}
+#else
+// FIXME: The 'is only allowed on variable declarations' diagnostic is better here.
+// expected-error@-5 {{type name does not allow storage class to be specified}}
+#endif
+
+__thread int t6(); // thread-local-warning {{'_Thread_local' is a C11 extension}}
+#if defined(GNU)
+// expected-error@-2 {{'__thread' is only allowed on variable declarations}}
+#elif defined(C11) || defined(C99)
+// expected-error@-4 {{'_Thread_local' is only allowed on variable declarations}}
+#else
+// expected-error@-6 {{'thread_local' is only allowed on variable declarations}}
+#endif
+
+int f(__thread int t7) { // expected-error {{' is only allowed on variable declarations}} \
+                         // thread-local-warning {{'_Thread_local' is a C11 extension}}
+  __thread int t8; // thread-local-warning {{'_Thread_local' is a C11 extension}}
+#if defined(GNU)
+  // expected-error@-2 {{'__thread' variables must have global storage}}
+#elif defined(C11) || defined(C99)
+  // expected-error@-4 {{'_Thread_local' variables must have global storage}}
+#endif
+  extern __thread int t9; // thread-local-warning {{'_Thread_local' is a C11 extension}}
+  static __thread int t10; // thread-local-warning {{'_Thread_local' is a C11 extension}}
+  __thread __private_extern__ int t11; // thread-local-warning {{'_Thread_local' is a C11 extension}}
+#if __cplusplus < 201103L
+  __thread auto int t12a; // expected-error-re {{cannot combine with previous '{{__thread|_Thread_local}}' declaration specifier}} \
+                          // thread-local-warning {{'_Thread_local' is a C11 extension}}
+  auto __thread int t12b; // expected-error {{cannot combine with previous 'auto' declaration specifier}} \
+                          // thread-local-warning {{'_Thread_local' is a C11 extension}}
+#elif !defined(CXX11)
+  __thread auto t12a = 0; // expected-error {{'_Thread_local' variables must have global storage}} \
+                          // thread-local-warning {{'_Thread_local' is a C11 extension}}
+  auto __thread t12b = 0; // expected-error {{'_Thread_local' variables must have global storage}} \
+                          // thread-local-warning {{'_Thread_local' is a C11 extension}}
+#endif
+  __thread register int t13a; // expected-error-re {{cannot combine with previous '{{__thread|_Thread_local|thread_local}}' declaration specifier}} \
+                              // thread-local-warning {{'_Thread_local' is a C11 extension}}
+  register __thread int t13b; // expected-error {{cannot combine with previous 'register' declaration specifier}} \
+                              // thread-local-warning {{'_Thread_local' is a C11 extension}}
+}
+
+__thread typedef int t14; // expected-error-re {{cannot combine with previous '{{__thread|_Thread_local|thread_local}}' declaration specifier}} \
+                          // thread-local-warning {{'_Thread_local' is a C11 extension}}
+__thread int t15; // expected-note {{previous definition is here}} \
+                  // thread-local-warning {{'_Thread_local' is a C11 extension}}
+extern int t15; // expected-error {{non-thread-local declaration of 't15' follows thread-local declaration}}
+extern int t16; // expected-note {{previous declaration is here}}
+__thread int t16; // expected-error {{thread-local declaration of 't16' follows non-thread-local declaration}} \
+                  // thread-local-warning {{'_Thread_local' is a C11 extension}}
+
+#ifdef CXX11
+extern thread_local int t17; // expected-note {{previous declaration is here}}
+_Thread_local int t17; // expected-error {{thread-local declaration of 't17' with static initialization follows declaration with dynamic initialization}} \
+                       // expected-warning {{'_Thread_local' is a C11 extension}}
+extern _Thread_local int t18; // expected-note {{previous declaration is here}} \
+                              // expected-warning {{'_Thread_local' is a C11 extension}}
+thread_local int t18; // expected-error {{thread-local declaration of 't18' with dynamic initialization follows declaration with static initialization}}
+#endif
+
+// PR13720
+__thread int thread_int; // thread-local-warning {{'_Thread_local' is a C11 extension}}
+int *thread_int_ptr = &thread_int;
+#ifndef __cplusplus
+// expected-error@-2 {{initializer element is not a compile-time constant}}
+#endif
+void g() {
+  int *p = &thread_int; // This is perfectly fine, though.
+}
+#if __cplusplus >= 201103L
+constexpr int *thread_int_ptr_2 = &thread_int; // expected-error {{must be initialized by a constant expression}}
+#endif
+
+int non_const();
+__thread int non_const_init = non_const(); // thread-local-warning {{'_Thread_local' is a C11 extension}}
+#if !defined(__cplusplus)
+// expected-error@-2 {{initializer element is not a compile-time constant}}
+#elif !defined(CXX11)
+// expected-error@-4 {{initializer for thread-local variable must be a constant expression}}
+#if __cplusplus >= 201103L
+// expected-note@-6 {{use 'thread_local' to allow this}}
+#endif
+#endif
+
+#ifdef __cplusplus
+struct S {
+  ~S();
+};
+__thread S s; // thread-local-warning {{'_Thread_local' is a C11 extension}}
+#if !defined(CXX11)
+// expected-error@-2 {{type of thread-local variable has non-trivial destruction}}
+#if __cplusplus >= 201103L
+// expected-note@-4 {{use 'thread_local' to allow this}}
+#endif
+#endif
+#endif
+
+#ifdef __cplusplus
+struct HasCtor {
+  HasCtor();
+};
+__thread HasCtor var_with_ctor; // thread-local-warning {{'_Thread_local' is a C11 extension}}
+#if !defined(CXX11)
+// expected-error@-2 {{initializer for thread-local variable must be a constant expression}}
+#if __cplusplus >= 201103L
+// expected-note@-4 {{use 'thread_local' to allow this}}
+#endif
+#endif
+#endif
+
+__thread int aggregate[10] = {0}; // thread-local-warning {{'_Thread_local' is a C11 extension}}