[bison.git] / m4 / realloc.m4

#serial 3

dnl From Jim Meyering.
dnl Determine whether realloc works when both arguments are 0.
dnl If it doesn't, arrange to use the replacement function.
dnl

AC_DEFUN(jm_FUNC_REALLOC,
[
 dnl xmalloc.c requires that this symbol be defined so it doesn't
 dnl mistakenly use a broken realloc -- as it might if this test were omitted.
 AC_DEFINE_UNQUOTED(HAVE_DONE_WORKING_REALLOC_CHECK, 1,
                    [Define if the realloc check has been performed. ])

 AC_CACHE_CHECK([for working realloc], jm_cv_func_working_realloc,
  [AC_TRY_RUN([
    char *realloc ();
    int
    main ()
    {
      exit (realloc (0, 0) ? 0 : 1);
    }
	  ],
	 jm_cv_func_working_realloc=yes,
	 jm_cv_func_working_realloc=no,
	 dnl When crosscompiling, assume realloc is broken.
	 jm_cv_func_working_realloc=no)
  ])
  if test $jm_cv_func_working_realloc = no; then
    AC_SUBST(LIBOBJS)
    LIBOBJS="$LIBOBJS realloc.$ac_objext"
    AC_DEFINE_UNQUOTED(realloc, rpl_realloc,
      [Define to rpl_realloc if the replacement function should be used.])
  fi
])
Commit	Line	Data
d7913476 AD	1	#serial 3
	2
	3	dnl From Jim Meyering.
	4	dnl Determine whether realloc works when both arguments are 0.
	5	dnl If it doesn't, arrange to use the replacement function.
	6	dnl
	7
	8	AC_DEFUN(jm_FUNC_REALLOC,
	9	[
	10	dnl xmalloc.c requires that this symbol be defined so it doesn't
	11	dnl mistakenly use a broken realloc -- as it might if this test were omitted.
	12	AC_DEFINE_UNQUOTED(HAVE_DONE_WORKING_REALLOC_CHECK, 1,
	13	[Define if the realloc check has been performed. ])
	14
	15	AC_CACHE_CHECK([for working realloc], jm_cv_func_working_realloc,
	16	[AC_TRY_RUN([
	17	char *realloc ();
	18	int
	19	main ()
	20	{
	21	exit (realloc (0, 0) ? 0 : 1);
	22	}
	23	],
	24	jm_cv_func_working_realloc=yes,
	25	jm_cv_func_working_realloc=no,
	26	dnl When crosscompiling, assume realloc is broken.
	27	jm_cv_func_working_realloc=no)
	28	])
	29	if test $jm_cv_func_working_realloc = no; then
	30	AC_SUBST(LIBOBJS)
	31	LIBOBJS="$LIBOBJS realloc.$ac_objext"
	32	AC_DEFINE_UNQUOTED(realloc, rpl_realloc,
	33	[Define to rpl_realloc if the replacement function should be used.])
	34	fi
	35	])