1 // RUN: %clang_cc1 -std=c++11 -triple x86_64-linux-gnu -verify %s 2 3 alignas(1) int n1; // expected-error {{requested alignment is less than minimum alignment of 4 for type 'int'}} 4 alignas(1) alignas(2) int n2; // expected-error {{less than minimum alignment}} 5 alignas(1) alignas(2) alignas(4) int n3; // ok 6 alignas(1) alignas(2) alignas(0) int n4; // expected-error {{less than minimum alignment}} 7 alignas(1) alignas(2) int n5 alignas(4); // ok 8 alignas(1) alignas(4) int n6 alignas(2); // ok 9 alignas(1) int n7 alignas(2), // expected-error {{less than minimum alignment}} 10 n8 alignas(4); // ok 11 alignas(8) int n9 alignas(2); // ok, overaligned 12 13 enum alignas(1) E1 {}; // expected-error {{requested alignment is less than minimum alignment of 4 for type 'E1'}} 14 enum alignas(1) E2 : char {}; // ok 15 enum alignas(4) E3 { e3 = 0 }; // ok 16 enum alignas(4) E4 { e4 = 1ull << 33 }; // expected-error {{requested alignment is less than minimum alignment of 8 for type 'E4'}} 17 18 struct S1 { 19 alignas(8) int n; 20 }; 21 struct alignas(2) S2 { // expected-error {{requested alignment is less than minimum alignment of 4 for type 'S2'}} 22 int n; 23 }; 24 struct alignas(2) S3 { // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S3'}} 25 S1 s1; 26 }; 27 struct alignas(2) S4 : S1 { // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S4'}} 28 }; 29 struct S5 : S1 { 30 alignas(2) S1 s1; // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S1'}} 31 }; 32 struct S6 { 33 S1 s1; 34 }; 35 struct S7 : S1 { 36 }; 37 struct alignas(2) alignas(8) alignas(1) S8 : S1 { 38 }; 39 40 S1 s1 alignas(4); // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S1'}} 41 S6 s6 alignas(4); // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S6'}} 42 S7 s7 alignas(4); // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S7'}} 43 44 template<int N, int M, typename T> 45 struct alignas(N) X { // expected-error 3{{requested alignment is less than minimum}} 46 alignas(M) T t; // expected-error 3{{requested alignment is less than minimum}} 47 }; 48 49 template struct X<1, 1, char>; 50 template struct X<4, 1, char>; 51 template struct X<1, 2, char>; // expected-note {{instantiation}} 52 template struct X<1, 1, short>; // expected-note {{instantiation}} 53 template struct X<2, 1, short>; // expected-note {{instantiation}} 54 template struct X<2, 2, short>; 55 template struct X<16, 8, S1>; 56 template struct X<4, 4, S1>; // expected-note {{instantiation}} 57 58 template<int N, typename T> 59 struct Y { 60 enum alignas(N) E : T {}; // expected-error {{requested alignment is less than minimum}} 61 }; 62 template struct Y<1, char>; 63 template struct Y<2, char>; 64 template struct Y<1, short>; // expected-note {{instantiation}} 65 template struct Y<2, short>; 66 67 template<int N, typename T> 68 void f() { 69 alignas(N) T v; // expected-error {{requested alignment is less than minimum}} 70 }; 71 template void f<1, char>(); 72 template void f<2, char>(); 73 template void f<1, short>(); // expected-note {{instantiation}} 74 template void f<2, short>(); 75
