dnl 
dnl UD_CHECK_IEEE
dnl If the 'double' is not an IEEE double
dnl or the 'float' is not and IEEE single,
dnl define NO_IEEE_FLOAT
dnl
AC_DEFUN([UD_CHECK_IEEE],
[
AC_MSG_CHECKING(for IEEE floating point format)
AC_TRY_RUN([#ifndef NO_FLOAT_H
#include <float.h>
#endif

#define EXIT_NOTIEEE	1
#define EXIT_MAYBEIEEE	0

int
main()
{
#if	defined(FLT_RADIX)	&& FLT_RADIX != 2
		return EXIT_NOTIEEE;
#elif	defined(DBL_MAX_EXP)	&& DBL_MAX_EXP != 1024
		return EXIT_NOTIEEE;
#elif	defined(DBL_MANT_DIG)	&& DBL_MANT_DIG != 53
		return EXIT_NOTIEEE;
#elif 	defined(FLT_MAX_EXP)	&& !(FLT_MAX_EXP == 1024 || FLT_MAX_EXP == 128)
		return EXIT_NOTIEEE;
#elif	defined(FLT_MANT_DIG)	&& !(FLT_MANT_DIG == 53 || FLT_MANT_DIG == 24)
		return EXIT_NOTIEEE;
#else
	/* (assuming eight bit char) */
	if(sizeof(double) != 8)
		return EXIT_NOTIEEE;
	if(!(sizeof(float) == 4 || sizeof(float) == 8))
		return EXIT_NOTIEEE;

	return EXIT_MAYBEIEEE;
#endif
}],HAVE_IEEEFLOAT=yes, HAVE_IEEEFLOAT=no, :)
AC_MSG_RESULT($HAVE_IEEEFLOAT)
])