1 // RUN: %clang_cc1 -std=c++11 -verify %s 2 3 alignas(4) extern int n1; // expected-note {{previous declaration}} 4 alignas(8) int n1; // expected-error {{redeclaration has different alignment requirement (8 vs 4)}} 5 6 alignas(8) int n2; // expected-note {{previous declaration}} 7 alignas(4) extern int n2; // expected-error {{different alignment requirement (4 vs 8)}} 8 9 alignas(8) extern int n3; // expected-note {{previous declaration}} 10 alignas(4) extern int n3; // expected-error {{different alignment requirement (4 vs 8)}} 11 12 extern int n4; 13 alignas(8) extern int n4; 14 15 alignas(8) extern int n5; 16 extern int n5; 17 18 int n6; // expected-error {{'alignas' must be specified on definition if it is specified on any declaration}} 19 alignas(8) extern int n6; // expected-note {{declared with 'alignas' attribute here}} 20 21 extern int n7; 22 alignas(8) int n7; 23 24 alignas(8) extern int n8; // expected-note {{declared with 'alignas' attribute here}} 25 int n8; // expected-error {{'alignas' must be specified on definition if it is specified on any declaration}} 26 27 int n9; // expected-error {{'alignas' must be specified on definition if it is specified on any declaration}} 28 alignas(4) extern int n9; // expected-note {{declared with 'alignas' attribute here}} 29 30 struct S; 31 struct alignas(16) S; // expected-note {{declared with 'alignas' attribute here}} 32 struct S; 33 struct S { int n; }; // expected-error {{'alignas' must be specified on definition if it is specified on any declaration}} 34 35 struct alignas(2) T; 36 struct alignas(2) T { char c; }; // expected-note {{previous declaration is here}} 37 struct T; 38 struct alignas(4) T; // expected-error {{redeclaration has different alignment requirement (4 vs 2)}} 39 40 struct U; 41 struct alignas(2) U {}; 42 43 struct V {}; // expected-error {{'alignas' must be specified on definition if it is specified on any declaration}} 44 struct alignas(1) V; // expected-note {{declared with 'alignas' attribute here}} 45 46 template<int M, int N> struct alignas(M) W; 47 template<int M, int N> struct alignas(N) W {}; 48 W<4,4> w44; // ok 49 // FIXME: We should reject this. 50 W<1,2> w12; 51 static_assert(alignof(W<4,4>) == 4, ""); 52 53 template<int M, int N, int O, int P> struct X { 54 alignas(M) alignas(N) static char Buffer[32]; // expected-note {{previous declaration is here}} 55 }; 56 template<int M, int N, int O, int P> 57 alignas(O) alignas(P) char X<M, N, O, P>::Buffer[32]; // expected-error {{redeclaration has different alignment requirement (8 vs 2)}} 58 char *x1848 = X<1,8,4,8>::Buffer; // ok 59 char *x1248 = X<1,2,4,8>::Buffer; // expected-note {{in instantiation of}} 60 61 // Don't crash here. 62 alignas(4) struct Incomplete incomplete; // expected-error {{incomplete type}} expected-note {{forward declaration}} 63