kc3-lang/gnulib/lib/free.c

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• Hash : 3dfe86d1
  Author :
  Date : 2021-01-31T12:41:33
  

  Make it possible to compile free.c separately, unconditionally.
  
  * m4/free.m4 (gl_FUNC_FREE): Define HAVE_FREE_POSIX.
  * lib/free.c: Don't define rpl_free if not needed.
  

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• lib/free.c

• /* Make free() preserve errno.
  
     Copyright (C) 2003, 2006, 2009-2021 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program 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 General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* written by Paul Eggert */
  
  #include <config.h>
  
  /* Specification.  */
  #include <stdlib.h>
  
  /* A function definition is only needed if HAVE_FREE_POSIX is not defined.  */
  #if !HAVE_FREE_POSIX
  
  # include <errno.h>
  
  void
  rpl_free (void *p)
  # undef free
  {
  # if defined __GNUC__ && !defined __clang__
    /* An invalid GCC optimization
       <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98396>
       would optimize away the assignments in the code below, when link-time
       optimization (LTO) is enabled.  Make the code more complicated, so that
       GCC does not grok how to optimize it.  */
    int err[2];
    err[0] = errno;
    err[1] = errno;
    errno = 0;
    free (p);
    errno = err[errno == 0];
  # else
    int err = errno;
    free (p);
    errno = err;
  # endif
  }
  
  #endif
  

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