1 // RUN: %clang_cc1 -triple i686-apple-darwin9 %s -fsyntax-only -verify
2 // expected-no-diagnostics
3 
4 // Stack: [], Alignment: 8
5 
6 #pragma pack(push, 1)
7 // Stack: [8], Alignment: 1
8 
9 #pragma pack(push, 4)
10 // Stack: [8, 1], Alignment: 4
11 
12 // Note that this differs from gcc; pack() in gcc appears to pop the
13 // top stack entry and resets the current alignment. This is both
14 // inconsistent with MSVC, and the gcc documentation. In other cases,
15 // for example changing this to pack(8), I don't even understand what gcc
16 // is doing.
17 
18 #pragma pack()
19 // Stack: [8, 1], Alignment: 8
20 
21 #pragma pack(pop)
22 // Stack: [8], Alignment: 1
23 struct s0 {
24   char f0;
25   short f1;
26 };
27 int a[sizeof(struct s0) == 3 ? 1 : -1];
28 
29 #pragma pack(pop)
30 // Stack: [], Alignment: 8
31 struct s1 {
32   char f0;
33   short f1;
34 };
35 int b[sizeof(struct s1) == 4 ? 1 : -1];
36