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 alignas(1) extern int n10; // expected-error {{less than minimum alignment}}
13
14 typedef __attribute__((aligned(16))) int IntAlign16;
15 enum E6 : IntAlign16 {};
16 static_assert(alignof(E6) == 4, "");
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>
f()59 void f() {
60 alignas(N) T v; // expected-error {{requested alignment is less than minimum}}
61 };
62 template void f<1, char>();
63 template void f<2, char>();
64 template void f<1, short>(); // expected-note {{instantiation}}
65 template void f<2, short>();
66