text: /* Definition of __INDIRECT_RETURN.  x86 version.
     Copyright (C) 2018 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library 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
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, see
     <http://www.gnu.org/licenses/>.  */
  
  #ifndef _UCONTEXT_H
  # error "Never include <bits/indirect-return.h> directly; use <ucontext.h> instead."
  #endif
  
  /* On x86, swapcontext returns via indirect branch when the shadow stack
     is enabled.  Define __INDIRECT_RETURN to indicate whether swapcontext
     returns via indirect branch.  */
  #if defined __CET__ && (__CET__ & 2) != 0
  # if __glibc_has_attribute (__indirect_return__)
  #  define __INDIRECT_RETURN __attribute__ ((__indirect_return__))
  # else
  /* Newer compilers provide the indirect_return attribute, but without
     it we can use returns_twice to affect the optimizer in the same
     way and avoid unsafe optimizations.  */
  #  define __INDIRECT_RETURN __attribute__ ((__returns_twice__))
  # endif
  #else
  # define __INDIRECT_RETURN
  #endif
  