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// weak_undef_test.cc -- test handling of weak undefined symbols for gold

// Copyright 2008 Free Software Foundation, Inc.

// Written by Cary Coutant <ccoutant@google.com>.

// This file is part of gold.

// This program is free software; you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation; either version 3 of the License, or

// (at your option) any later version.

// This program is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License

// along with this program; if not, write to the Free Software

// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

// MA 02110-1301, USA.

// We test that we correctly deal with weak undefined symbols.

// We need to make sure that a weak undefined symbol in the main

// program is resolved to zero by the linker and that no dynamic

// relocation is generated.  We also make sure that a weak undefined

// symbol in a shared library can resolve to a symbol in the main

// program.

// This file will be linked with a shared library that does not

// define the symbol, so that the symbol remains undefined.

// Through the use of LD_LIBRARY_PATH, the program will load

// an alternate shared library that does define the symbol,

// so that we can detect whether the symbol was left for runtime

// resolution.

// Similarly, this file will be linked with a shared library that

// does define a different symbol, and loaded with an alternate

// shared library that does not define that symbol.  We check that

// the weak reference remains weak, and that it is resolved to

// zero at runtime.

#include <cstdio>

#include "weak_undef.h"

extern int no_such_symbol_ __attribute__ ((weak));

extern int link_time_only __attribute__ ((weak));

int *p1 = &no_such_symbol_;

int *p2 = &link_time_only;

int v2 = 42;

int

main()

{

  int status = 0;

  int v;

  if ((v = t1()) != 2)

    {

      fprintf(stderr, "FAILED weak undef test 1: %s\n",

              "bound to wrong library");

      status = 1;

    }

  if ((v = t2()) != 42)

    {

      fprintf(stderr, "FAILED weak undef test 2: expected %d, got %d\n",

              42, v);

      status = 1;

    }

  if ((v = t3()) != 42)

    {

      fprintf(stderr, "FAILED weak undef test 3: expected %d, got %d\n",

              42, v);

      status = 1;

    }

  if (&no_such_symbol_ != NULL)

    {

      fprintf(stderr, "FAILED weak undef test 4: %s\n",

              "&no_such_symbol_ is not NULL");

      status = 1;

    }

  if (p1 != NULL)

    {

      fprintf(stderr, "FAILED weak undef test 5: %s\n",

              "p1 is not NULL");

      status = 1;

    }

  if (p2 != NULL)

    {

      fprintf(stderr, "FAILED weak undef test 6: %s\n",

              "p2 is not NULL");

      status = 1;

    }

  return status;

}