gold/testsuite/weak_undef_test.cc

   1 // weak_undef_test.cc -- test handling of weak undefined symbols for gold
   2
   3 // Copyright 2008 Free Software Foundation, Inc.
   4 // Written by Cary Coutant <ccoutant@google.com>.
   5
   6 // This file is part of gold.
   7
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 3 of the License, or
  11 // (at your option) any later version.
  12
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 // MA 02110-1301, USA.
  22
  23 // We test that we correctly deal with weak undefined symbols.
  24 // We need to make sure that the symbol is resolved to zero
  25 // by the linker and that no dynamic relocation is generated.
  26
  27 // This file will be linked with a shared library that does not
  28 // define the symbol, so that the symbol remains undefined.
  29 // Through the use of LD_LIBRARY_PATH, the program will load
  30 // an alternate shared library that does define the symbol,
  31 // so that we can detect whether the symbol was left for runtime
  32 // resolution.
  33
  34
  35 #include <cstdio>
  36
  37 extern int no_such_symbol_ __attribute__ ((weak));
  38
  39 int
  40 main()
  41 {
  42   if (&no_such_symbol_ != NULL)
  43     {
  44       fprintf(stderr, "FAILED the weak undef test: &no_such_symbol_ is not NULL\n");
  45       return 1;
  46     }
  47   return 0;
  48 }