gold/testsuite/weak_undef_test_2.cc

   1 // weak_undef_test_2.cc -- test handling of weak undefined symbols for gold
   2
   3 // Copyright (C) 2014-2021 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 // This file tests that we correctly deal with weak undefined symbols
  24 // when searching archive libraries.  If we have a weak undefined symbol,
  25 // it should not cause us to link an archive library member that defines
  26 // that symbol.  However, if the symbol is also listed in a -u option on
  27 // the command line, it should cause the archive member to be linked.
  28
  29
  30 #include <cstdio>
  31
  32 // This symbol is defined in weak_undef_file3.cc, but we should
  33 // not load it from the library.
  34 extern int weak_undef_1 __attribute__ ((weak));
  35
  36 // This symbol is defined in weak_undef_file4.cc, but is also
  37 // listed in a -u option on the link command, so we should
  38 // load it from the library.
  39 extern int weak_undef_2 __attribute__ ((weak));
  40
  41 int *p1 = &weak_undef_1;
  42
  43 int *p2 = &weak_undef_2;
  44
  45 int
  46 main()
  47 {
  48   int status = 0;
  49
  50   if (&weak_undef_1 != NULL)
  51     {
  52       fprintf(stderr, "FAILED weak undef test 1: %s\n",
  53               "&weak_undef_1 is not NULL");
  54       status = 1;
  55     }
  56
  57   if (&weak_undef_2 == NULL)
  58     {
  59       fprintf(stderr, "FAILED weak undef test 2: %s\n",
  60               "&weak_undef_2 is NULL");
  61       status = 1;
  62     }
  63
  64   if (p1 != NULL)
  65     {
  66       fprintf(stderr, "FAILED weak undef test 3: %s\n",
  67               "p1 is not NULL");
  68       status = 1;
  69     }
  70
  71   if (p2 == NULL)
  72     {
  73       fprintf(stderr, "FAILED weak undef test 4: %s\n",
  74               "p2 is NULL");
  75       status = 1;
  76     }
  77
  78   return status;
  79 }