1  /* Program with local IFUNC resolver which crashes, for testing bug 24214.
       2     Copyright (C) 2019-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  /* The construct below is expected to produce an IRELATIVE relocation
      20     with an IFUNC resolver that crashes. ldd should not performs such
      21     relocations.  */
      22  
      23  #include <config.h>
      24  
      25  #ifdef HAVE_GCC_IFUNC
      26  
      27  # include <stddef.h>
      28  
      29  static void
      30  implementation (void)
      31  {
      32    /* Produce a crash, without depending on any relocations.  */
      33    volatile char *volatile p = NULL;
      34    *p = 0;
      35  }
      36  
      37  static __typeof__ (implementation) *
      38  resolver (void)
      39  {
      40    /* Produce a crash, without depending on any relocations.  */
      41    volatile char *volatile p = NULL;
      42    *p = 0;
      43    return implementation;
      44  }
      45  
      46  static void magic (void) __attribute__ ((ifunc ("resolver")));
      47  
      48  void (*magic_ptr) (void) = magic;
      49  
      50  #endif /* HAVE_GCC_IFUNC */
      51  
      52  /* The program is expected not to run.  */
      53  int
      54  main (void)
      55  {
      56    return 1;
      57  }