| # |
| # This function determines if the isnan function is available on this |
| # platform. |
| # |
| AC_DEFUN([AC_FUNC_ISNAN],[ |
| AC_SINGLE_CXX_CHECK([ac_cv_func_isnan_in_math_h], |
| [isnan], [<math.h>], |
| [float f; isnan(f);]) |
| |
| if test "$ac_cv_func_isnan_in_math_h" = "yes" ; then |
| AC_DEFINE([HAVE_ISNAN_IN_MATH_H],1,[Set to 1 if the isnan function is found in <math.h>]) |
| fi |
| |
| AC_SINGLE_CXX_CHECK([ac_cv_func_isnan_in_cmath], |
| [isnan], [<cmath>], |
| [float f; isnan(f);]) |
| if test "$ac_cv_func_isnan_in_cmath" = "yes" ; then |
| AC_DEFINE([HAVE_ISNAN_IN_CMATH],1,[Set to 1 if the isnan function is found in <cmath>]) |
| fi |
| |
| AC_SINGLE_CXX_CHECK([ac_cv_func_std_isnan_in_cmath], |
| [std::isnan], [<cmath>], |
| [float f; std::isnan(f);]) |
| if test "$ac_cv_func_std_isnan_in_cmath" = "yes" ; then |
| AC_DEFINE([HAVE_STD_ISNAN_IN_CMATH],1,[Set to 1 if the std::isnan function is found in <cmath>]) |
| fi |
| ]) |
