4 dnl Determine whether realloc accepts 0 as its first argument.
5 dnl If it doesn't, arrange to use the replacement function.
7 dnl If you use this macro in a package, you should
8 dnl add the following two lines to acconfig.h:
9 dnl /* Define to rpl_realloc if the replacement function should be used. */
13 AC_DEFUN(jm_FUNC_REALLOC,
15 AC_CACHE_CHECK([for working realloc], jm_cv_func_working_realloc,
21 exit (realloc (0, 1) ? 0 : 1);
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)
29 if test $jm_cv_func_working_realloc = no; then
30 LIBOBJS="$LIBOBJS realloc.o"
31 AC_DEFINE_UNQUOTED(realloc, rpl_realloc)