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// PR c++/39480

// It isn't always safe to call memcpy with identical arguments.

// { dg-do run }

extern "C" void abort();

extern "C" void *

memcpy(void *dest, void *src, __SIZE_TYPE__ n)

{

  if (dest == src)

    abort();

  else

    {

      __SIZE_TYPE__ i;

      for (i = 0; i < n; i++)

        ((char *)dest)[i] = ((const char*)src)[i];

    }

}

struct A

{

  double d[10];

};

struct B: public A

{

  char bc;

};

B b;

void f(B *a1, B* a2)

{

  *a1 = *a2;

}

int main()

{

  f(&b,&b);

}