gold/testsuite/weak_unresolved_symbols_test.cc

   1 // weak_unresolved_symbols_test.cc -- a test case for gold
   2
   3 // Copyright (C) 2015-2023 Free Software Foundation, Inc.
   4 // Written by Sriraman Tallam <tmsriram@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 // Test --weak-unresolved-symbols.  Symbol foo remains unresolved but
  24 // with -fPIE, needs a GOT entry and has a dynsym entry and a dynamic
  25 // relocation against it created.  This  will fail to link and run without
  26 // --weak-unresolved-symbols.  With --warn-unresolved-symbols, it will link
  27 // but the dynamic linker will complain that foo(_Z3foov) is unresolved.
  28
  29 extern int foo();
  30
  31 int bar() {
  32   return 0;
  33 }
  34
  35 int (*p)() = &bar;
  36
  37 int main() {
  38   if (p == &foo)
  39     {
  40       foo();
  41     }
  42   else
  43     (*p)();
  44   return 0;
  45 }