1 # 2 # This function determines if the isnan function is available on this 3 # platform. 4 # 5 AC_DEFUN([AC_FUNC_ISNAN],[ 6 AC_SINGLE_CXX_CHECK([ac_cv_func_isnan_in_math_h], 7 [isnan], [<math.h>], 8 [float f; isnan(f);]) 9 10 if test "$ac_cv_func_isnan_in_math_h" = "yes" ; then 11 AC_DEFINE([HAVE_ISNAN_IN_MATH_H],1,[Set to 1 if the isnan function is found in <math.h>]) 12 fi 13 14 AC_SINGLE_CXX_CHECK([ac_cv_func_isnan_in_cmath], 15 [isnan], [<cmath>], 16 [float f; isnan(f);]) 17 if test "$ac_cv_func_isnan_in_cmath" = "yes" ; then 18 AC_DEFINE([HAVE_ISNAN_IN_CMATH],1,[Set to 1 if the isnan function is found in <cmath>]) 19 fi 20 21 AC_SINGLE_CXX_CHECK([ac_cv_func_std_isnan_in_cmath], 22 [std::isnan], [<cmath>], 23 [float f; std::isnan(f);]) 24 if test "$ac_cv_func_std_isnan_in_cmath" = "yes" ; then 25 AC_DEFINE([HAVE_STD_ISNAN_IN_CMATH],1,[Set to 1 if the std::isnan function is found in <cmath>]) 26 fi 27 ]) 28
