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1 // RUN: %clang_cc1 -fsyntax-only -fcxx-exceptions -verify -pedantic -std=c++11 %s
2 
3 int align_illegal alignas(3); //expected-error {{requested alignment is not a power of 2}}
4 char align_big alignas(int);
5 int align_small alignas(1); // expected-error {{requested alignment is less than minimum}}
6 int align_multiple alignas(1) alignas(8) alignas(1);
7 alignas(4) int align_before;
8 
9 struct align_member {
10   int member alignas(8);
11   int bitfield alignas(1) : 1; // expected-error {{}}
12 };
13 
f(char c)14 void f(alignas(1) char c) { // expected-error {{'alignas' attribute cannot be applied to a function parameter}}
15   alignas(1) register char k; // expected-error {{'alignas' attribute cannot be applied to a variable with 'register' storage class}} expected-warning {{deprecated}}
16   try {
17   } catch (alignas(4) int n) { // expected-error {{'alignas' attribute cannot be applied to a 'catch' variable}}
18   }
19 }
20 
21 
22 template <unsigned A> struct alignas(A) align_class_template {};
23 
24 template <typename... T> struct alignas(T...) align_class_temp_pack_type {};
25 template <unsigned... A> struct alignas(A...) align_class_temp_pack_expr {};
26 struct alignas(int...) alignas_expansion_no_packs {}; // expected-error {{pack expansion does not contain any unexpanded parameter packs}}
27 template <typename... A> struct outer {
28   template <typename... B> struct alignas(alignof(A) * alignof(B)...) inner {};
29   // expected-error@-1 {{pack expansion contains parameter packs 'A' and 'B' that have different lengths (1 vs. 2)}}
30 };
31 outer<int>::inner<short, double> mismatched_packs; // expected-note {{in instantiation of}}
32 
33 typedef char align_typedef alignas(8); // expected-error {{'alignas' attribute only applies to variables, data members and tag types}}
34 template<typename T> using align_alias_template = align_typedef alignas(8); // expected-error {{'alignas' attribute cannot be applied to types}}
35 
36 static_assert(alignof(align_big) == alignof(int), "k's alignment is wrong"); // expected-warning{{'alignof' applied to an expression is a GNU extension}}
37 static_assert(alignof(align_small) == 1, "j's alignment is wrong"); // expected-warning{{'alignof' applied to an expression is a GNU extension}}
38 static_assert(alignof(align_multiple) == 8, "l's alignment is wrong"); // expected-warning{{'alignof' applied to an expression is a GNU extension}}
39 static_assert(alignof(align_member) == 8, "quuux's alignment is wrong");
40 static_assert(sizeof(align_member) == 8, "quuux's size is wrong");
41 static_assert(alignof(align_class_template<8>) == 8, "template's alignment is wrong");
42 static_assert(alignof(align_class_template<16>) == 16, "template's alignment is wrong");
43 static_assert(alignof(align_class_temp_pack_type<short, int, long>) == alignof(long), "template's alignment is wrong");
44 static_assert(alignof(align_class_temp_pack_expr<8, 16, 32>) == 32, "template's alignment is wrong");
45 static_assert(alignof(outer<int,char>::inner<double,short>) == alignof(int) * alignof(double), "template's alignment is wrong");
46 
47 static_assert(alignof(int(int)) >= 1, "alignof(function) not positive"); // expected-error{{invalid application of 'alignof' to a function type}}
48 
49 [[__carries_dependency__]]  // expected-warning{{unknown attribute '__carries_dependency__' ignored}}
50 void func(void);
51 
52 alignas(4) auto PR19252 = 0;
53