xref: /llvm-project/clang/test/PCH/decl-attrs.cpp (revision 4ae8651c59241bca0c1ea5adaf8f06b292696b6f)
1 // RUN: %clang_cc1 -std=c++20 -emit-pch -o %t.a %s
2 // RUN: %clang_cc1 -std=c++20 -include-pch %t.a %s -verify
3 
4 #ifndef HEADER
5 #define HEADER
6 
7 namespace preferred_name {
8   template<typename T> struct X;
9   using Y = X<int>;
10   using Z = X<float>;
11   template<typename T> struct [[using clang: preferred_name(Y), preferred_name(Z)]] X {};
12   Y y;
13 }
14 
15 namespace aligned {
16   // PR48434: ensure attributes don't introduce deserialization cycles.
17   template<typename T> struct X1;
18   using Y1 = X1<int>;
19   template<typename T> struct alignas(Y1*) X1 {};
20   Y1 y1;
21 
22   template<typename T> struct X2;
23   using Y2 = X2<int>;
24   template<typename T> struct alignas(Y2*) X2 {};
25 }
26 
27 #else
28 
29 namespace preferred_name {
30   Z z;
31 
forget(T t)32   template<typename T> T forget(T t) { return t; }
f()33   void f() {
34     forget(y).foo(); // expected-error {{no member named 'foo' in 'preferred_name::Y'}}
35     forget(z).foo(); // expected-error {{no member named 'foo' in 'preferred_name::Z'}}
36   }
37 }
38 
39 namespace aligned {
40   extern Y1 y1;
41   extern Y2 y2;
42   static_assert(alignof(Y1) == alignof(Y1*), "");
43   static_assert(alignof(Y2) == alignof(Y2*), "");
44 }
45 
46 #endif
47