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// Make sure we don't assume that a weak symbol is always non-NULL.

// Make sure we don't assume that a weak symbol is always non-NULL.

// This is just like Walways-true-1.C, except that it uses a weak

// This is just like Walways-true-1.C, except that it uses a weak

// symbol.

// symbol.

// Origin: Ian Lance Taylor 

// Origin: Ian Lance Taylor 

// { dg-do compile}

// { dg-do compile}

// { dg-options "-Waddress" }

// { dg-options "-Waddress" }

// { dg-require-weak "" }

// { dg-require-weak "" }

extern int foo (int) __attribute__ ((weak));

extern int foo (int) __attribute__ ((weak));

int i __attribute__ ((weak));

int i __attribute__ ((weak));

void

void

bar (int a)

bar (int a)

{

{

 lab:

 lab:

  if (foo)

  if (foo)

    foo (0);

    foo (0);

  if (foo (1))

  if (foo (1))

    ;

    ;

  if (&i)

  if (&i)

    foo (2);

    foo (2);

  if (i)

  if (i)

    foo (3);

    foo (3);

  if (&a)       // { dg-warning "always evaluate as" "correct warning" }

  if (&a)       // { dg-warning "always evaluate as" "correct warning" }

    foo (4);

    foo (4);

  if (a)

  if (a)

    foo (5);

    foo (5);

  if (&&lab)    // { dg-warning "always evaluate as" "correct warning" }

  if (&&lab)    // { dg-warning "always evaluate as" "correct warning" }

    foo (6);

    foo (6);

  if (foo == 0)

  if (foo == 0)

    foo (7);

    foo (7);

  if (foo (1) == 0)

  if (foo (1) == 0)

    foo (8);

    foo (8);

  if (&i == 0)

  if (&i == 0)

    foo (9);

    foo (9);

  if (i == 0)

  if (i == 0)

    foo (10);

    foo (10);

  if (&a == 0)  // { dg-warning "never be NULL" "correct warning" }

  if (&a == 0)  // { dg-warning "never be NULL" "correct warning" }

    foo (11);

    foo (11);

  if (a == 0)

  if (a == 0)

    foo (12);

    foo (12);

  if (&&lab == 0) // { dg-warning "never be NULL" "correct warning" }

  if (&&lab == 0) // { dg-warning "never be NULL" "correct warning" }

    foo (13);

    foo (13);

  if (0 == foo)

  if (0 == foo)

    foo (14);

    foo (14);

  if (0 == foo (1))

  if (0 == foo (1))

    foo (15);

    foo (15);

  if (0 == &i)

  if (0 == &i)

    foo (16);

    foo (16);

  if (0 == i)

  if (0 == i)

    foo (17);

    foo (17);

  if (0 == &a)  // { dg-warning "never be NULL" "correct warning" }

  if (0 == &a)  // { dg-warning "never be NULL" "correct warning" }

    foo (18);

    foo (18);

  if (0 == a)

  if (0 == a)

    foo (19);

    foo (19);

  if (0 == &&lab) // { dg-warning "never be NULL" "correct warning" }

  if (0 == &&lab) // { dg-warning "never be NULL" "correct warning" }

    foo (20);

    foo (20);

}

}