clang/test/SemaCXX/address-packed-member-memops.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2 // expected-no-diagnostics
   3
   4 struct B {
   5   int x, y, z, w;
   6 } b;
   7
   8 struct __attribute__((packed)) A {
   9   struct B b;
  10 } a;
  11
  12 typedef __typeof__(sizeof(int)) size_t;
  13
  14 extern "C" {
  15 void *memcpy(void *dest, const void *src, size_t n);
  16 int memcmp(const void *s1, const void *s2, size_t n);
  17 void *memmove(void *dest, const void *src, size_t n);
  18 void *memset(void *s, int c, size_t n);
  19 }
  20
  21 int x;
  22
  23 void foo() {
  24   memcpy(&a.b, &b, sizeof(b));
  25   memmove(&a.b, &b, sizeof(b));
  26   memset(&a.b, 0, sizeof(b));
  27   x = memcmp(&a.b, &b, sizeof(b));
  28 }