1// RUN: %clang_cc1 -std=c++11 -triple x86_64-linux-gnu -verify %s
2
3alignas(1) int n1; // expected-error {{requested alignment is less than minimum alignment of 4 for type 'int'}}
4alignas(1) alignas(2) int n2; // expected-error {{less than minimum alignment}}
5alignas(1) alignas(2) alignas(4) int n3; // ok
6alignas(1) alignas(2) alignas(0) int n4; // expected-error {{less than minimum alignment}}
7alignas(1) alignas(2) int n5 alignas(4); // ok
8alignas(1) alignas(4) int n6 alignas(2); // ok
9alignas(1) int n7 alignas(2), // expected-error {{less than minimum alignment}}
10               n8 alignas(4); // ok
11alignas(8) int n9 alignas(2); // ok, overaligned
12alignas(1) extern int n10; // expected-error {{less than minimum alignment}}
13
14enum alignas(1) E1 {}; // expected-error {{requested alignment is less than minimum alignment of 4 for type 'E1'}}
15enum alignas(1) E2 : char {}; // ok
16enum alignas(4) E3 { e3 = 0 }; // ok
17enum alignas(4) E4 { e4 = 1ull << 33 }; // expected-error {{requested alignment is less than minimum alignment of 8 for type 'E4'}}
18enum alignas(8) E5 {};
19static_assert(alignof(E5) == 8, "");
20
21typedef __attribute__((aligned(16))) int IntAlign16;
22enum E6 : IntAlign16 {};
23static_assert(alignof(E6) == 4, "");
24
25struct S1 {
26  alignas(8) int n;
27};
28struct alignas(2) S2 { // expected-error {{requested alignment is less than minimum alignment of 4 for type 'S2'}}
29  int n;
30};
31struct alignas(2) S3 { // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S3'}}
32  S1 s1;
33};
34struct alignas(2) S4 : S1 { // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S4'}}
35};
36struct S5 : S1 {
37  alignas(2) S1 s1; // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S1'}}
38};
39struct S6 {
40  S1 s1;
41};
42struct S7 : S1 {
43};
44struct alignas(2) alignas(8) alignas(1) S8 : S1 {
45};
46
47S1 s1 alignas(4); // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S1'}}
48S6 s6 alignas(4); // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S6'}}
49S7 s7 alignas(4); // expected-error {{requested alignment is less than minimum alignment of 8 for type 'S7'}}
50
51template<int N, int M, typename T>
52struct alignas(N) X { // expected-error 3{{requested alignment is less than minimum}}
53  alignas(M) T t; // expected-error 3{{requested alignment is less than minimum}}
54};
55
56template struct X<1, 1, char>;
57template struct X<4, 1, char>;
58template struct X<1, 2, char>; // expected-note {{instantiation}}
59template struct X<1, 1, short>; // expected-note {{instantiation}}
60template struct X<2, 1, short>; // expected-note {{instantiation}}
61template struct X<2, 2, short>;
62template struct X<16, 8, S1>;
63template struct X<4, 4, S1>; // expected-note {{instantiation}}
64
65template<int N, typename T>
66struct Y {
67  enum alignas(N) E : T {}; // expected-error {{requested alignment is less than minimum}}
68};
69template struct Y<1, char>;
70template struct Y<2, char>;
71template struct Y<1, short>; // expected-note {{instantiation}}
72template struct Y<2, short>;
73
74template<int N, typename T>
75void f() {
76  alignas(N) T v; // expected-error {{requested alignment is less than minimum}}
77};
78template void f<1, char>();
79template void f<2, char>();
80template void f<1, short>(); // expected-note {{instantiation}}
81template void f<2, short>();
82