# See if we need to provide obstacks.

dnl Copyright 1996-2017 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

dnl This replaces Autoconf's AC_FUNC_OBSTACK.

dnl The Autoconf version should be marked obsolete at some point.

AC_DEFUN([AC_FUNC_OBSTACK],

  [AC_LIBSOURCES([obstack.h, obstack.c])dnl

   AC_CACHE_CHECK([for obstacks that work with any size object],

     [ac_cv_func_obstack],

     [AC_LINK_IFELSE(

        [AC_LANG_PROGRAM(

           [[#include "obstack.h"

             void *obstack_chunk_alloc (size_t n) { return 0; }

             void obstack_chunk_free (void *p) { }

             /* Check that an internal function returns size_t, not int.  */

             size_t _obstack_memory_used (struct obstack *);

            ]],

           [[struct obstack mem;

             obstack_init (&mem;;

             obstack_free (&mem, 0);

           ]])],

        [ac_cv_func_obstack=yes],

        [ac_cv_func_obstack=no])])

   if test "$ac_cv_func_obstack" = yes; then

     AC_DEFINE([HAVE_OBSTACK], 1,

       [Define to 1 if the system has obstacks that work with any size object.])

   else

     AC_LIBOBJ([obstack])

   fi

])