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#
# This function determins if the the isinf function isavailable on this
# platform.
#
AC_DEFUN([AC_FUNC_ISINF],[
AC_SINGLE_CXX_CHECK([HAVE_ISINF_IN_MATH_H], [ac_cv_func_isinf_in_math_h],
[isinf], [<math.h>],
[#include <math.h>
int foo(float f) {return isinf(f);}])
AC_SINGLE_CXX_CHECK([HAVE_ISINF_IN_CMATH], [ac_cv_func_isinf_in_cmath],
[isinf], [<cmath>],
[#include <cmath>
int foo(float f) {return isinf(f);}])
AC_SINGLE_CXX_CHECK([HAVE_STD_ISINF_IN_CMATH], [ac_cv_func_std_isinf_in_cmath],
[std::isinf], [<cmath>],
[#include <cmath>
using std::isinf; int foo(float f) {return isinf(f);}])
AC_SINGLE_CXX_CHECK([HAVE_FINITE_IN_IEEEFP_H], [ac_cv_func_finite_in_ieeefp_h],
[finite], [<ieeefp.h>],
[#include <ieeefp.h>
int foo(float f) {return finite(f);}])
])
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