#
# Determine if the printf() functions have the %a format character.
# This is modified from:
# http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_slist.html
AC_DEFUN([AC_C_PRINTF_A],
[
        AC_MSG_CHECKING([for printf %a format specifier])
	AC_LANG_SAVE
	AC_LANG_C
	AC_RUN_IFELSE(
		AC_LANG_PROGRAM([#include <stdio.h>
		                 #include <stdlib.h>],
		                 [[[
		                 volatile double A, B;
		                 char Buffer[100];
		                 A = 1;
		                 A /= 10.0;
		                 sprintf(Buffer, "%a", A);
		                 B = atof(Buffer);
		                 if (A != B)
							 return (1);
		                 if (A != 0x1.999999999999ap-4)
							 return (1);
		                 return (0);]]]),
		ac_c_printf_a=yes,ac_c_printf_a=no)
	AC_LANG_RESTORE
        AC_MSG_RESULT($ac_c_printf_a)
	if test "$ac_c_printf_a" = "yes"; then
		AC_DEFINE([HAVE_PRINTF_A],[1],[Define to have the %a format string])
	fi
])