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      1 // RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -Wno-private-extern -verify -pedantic %s -DGNU
      2 // RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -Wno-private-extern -verify -pedantic -x c++ %s -DGNU -std=c++98
      3 // RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -Wno-private-extern -verify -pedantic %s -DC11 -D__thread=_Thread_local
      4 // RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -Wno-private-extern -verify -pedantic -x c++ %s -DC11 -D__thread=_Thread_local -std=c++98
      5 // 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
      6 // RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -Wno-private-extern -verify -pedantic -x c++ %s -DC11 -D__thread=_Thread_local -std=c++11 -Wno-deprecated
      7 
      8 #ifdef __cplusplus
      9 // In C++, we define __private_extern__ to extern.
     10 #undef __private_extern__
     11 #endif
     12 
     13 __thread int t1;
     14 __thread extern int t2;
     15 __thread static int t3;
     16 #ifdef GNU
     17 // expected-warning@-3 {{'__thread' before 'extern'}}
     18 // expected-warning@-3 {{'__thread' before 'static'}}
     19 #endif
     20 
     21 __thread __private_extern__ int t4;
     22 struct t5 { __thread int x; };
     23 #ifdef __cplusplus
     24 // expected-error-re@-2 {{'{{__thread|_Thread_local|thread_local}}' is only allowed on variable declarations}}
     25 #else
     26 // FIXME: The 'is only allowed on variable declarations' diagnostic is better here.
     27 // expected-error@-5 {{type name does not allow storage class to be specified}}
     28 #endif
     29 
     30 __thread int t6();
     31 #if defined(GNU)
     32 // expected-error@-2 {{'__thread' is only allowed on variable declarations}}
     33 #elif defined(C11)
     34 // expected-error@-4 {{'_Thread_local' is only allowed on variable declarations}}
     35 #else
     36 // expected-error@-6 {{'thread_local' is only allowed on variable declarations}}
     37 #endif
     38 
     39 int f(__thread int t7) { // expected-error {{' is only allowed on variable declarations}}
     40   __thread int t8;
     41 #if defined(GNU)
     42   // expected-error@-2 {{'__thread' variables must have global storage}}
     43 #elif defined(C11)
     44   // expected-error@-4 {{'_Thread_local' variables must have global storage}}
     45 #endif
     46   extern __thread int t9;
     47   static __thread int t10;
     48   __thread __private_extern__ int t11;
     49 #if __cplusplus < 201103L
     50   __thread auto int t12a; // expected-error-re {{cannot combine with previous '{{__thread|_Thread_local}}' declaration specifier}}
     51   auto __thread int t12b; // expected-error {{cannot combine with previous 'auto' declaration specifier}}
     52 #elif !defined(CXX11)
     53   __thread auto t12a = 0; // expected-error {{'_Thread_local' variables must have global storage}}
     54   auto __thread t12b = 0; // expected-error {{'_Thread_local' variables must have global storage}}
     55 #endif
     56   __thread register int t13a; // expected-error-re {{cannot combine with previous '{{__thread|_Thread_local|thread_local}}' declaration specifier}}
     57   register __thread int t13b; // expected-error {{cannot combine with previous 'register' declaration specifier}}
     58 }
     59 
     60 __thread typedef int t14; // expected-error-re {{cannot combine with previous '{{__thread|_Thread_local|thread_local}}' declaration specifier}}
     61 __thread int t15; // expected-note {{previous definition is here}}
     62 extern int t15; // expected-error {{non-thread-local declaration of 't15' follows thread-local declaration}}
     63 extern int t16; // expected-note {{previous declaration is here}}
     64 __thread int t16; // expected-error {{thread-local declaration of 't16' follows non-thread-local declaration}}
     65 
     66 #ifdef CXX11
     67 extern thread_local int t17; // expected-note {{previous declaration is here}}
     68 _Thread_local int t17; // expected-error {{thread-local declaration of 't17' with static initialization follows declaration with dynamic initialization}}
     69 extern _Thread_local int t18; // expected-note {{previous declaration is here}}
     70 thread_local int t18; // expected-error {{thread-local declaration of 't18' with dynamic initialization follows declaration with static initialization}}
     71 #endif
     72 
     73 // PR13720
     74 __thread int thread_int;
     75 int *thread_int_ptr = &thread_int;
     76 #ifndef __cplusplus
     77 // expected-error@-2 {{initializer element is not a compile-time constant}}
     78 #endif
     79 void g() {
     80   int *p = &thread_int; // This is perfectly fine, though.
     81 }
     82 #if __cplusplus >= 201103L
     83 constexpr int *thread_int_ptr_2 = &thread_int; // expected-error {{must be initialized by a constant expression}}
     84 #endif
     85 
     86 int non_const();
     87 __thread int non_const_init = non_const();
     88 #if !defined(__cplusplus)
     89 // expected-error@-2 {{initializer element is not a compile-time constant}}
     90 #elif !defined(CXX11)
     91 // expected-error@-4 {{initializer for thread-local variable must be a constant expression}}
     92 #if __cplusplus >= 201103L
     93 // expected-note@-6 {{use 'thread_local' to allow this}}
     94 #endif
     95 #endif
     96 
     97 #ifdef __cplusplus
     98 struct S {
     99   ~S();
    100 };
    101 __thread S s;
    102 #if !defined(CXX11)
    103 // expected-error@-2 {{type of thread-local variable has non-trivial destruction}}
    104 #if __cplusplus >= 201103L
    105 // expected-note@-4 {{use 'thread_local' to allow this}}
    106 #endif
    107 #endif
    108 #endif
    109 
    110 #ifdef __cplusplus
    111 struct HasCtor {
    112   HasCtor();
    113 };
    114 __thread HasCtor var_with_ctor;
    115 #if !defined(CXX11)
    116 // expected-error@-2 {{initializer for thread-local variable must be a constant expression}}
    117 #if __cplusplus >= 201103L
    118 // expected-note@-4 {{use 'thread_local' to allow this}}
    119 #endif
    120 #endif
    121 #endif
    122 
    123 __thread int aggregate[10] = {0};
    124