clang/test/Sema/pragma-pack-3.c

   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];