2
# This function determines if the isnan function is available on this
5
AC_DEFUN([AC_FUNC_ISNAN],[
6
AC_SINGLE_CXX_CHECK([ac_cv_func_isnan_in_math_h],
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if test "$ac_cv_func_isnan_in_math_h" = "yes" ; then
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AC_DEFINE([HAVE_ISNAN_IN_MATH_H],1,[Set to 1 if the isnan function is found in <math.h>])
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AC_SINGLE_CXX_CHECK([ac_cv_func_isnan_in_cmath],
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if test "$ac_cv_func_isnan_in_cmath" = "yes" ; then
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AC_DEFINE([HAVE_ISNAN_IN_CMATH],1,[Set to 1 if the isnan function is found in <cmath>])
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AC_SINGLE_CXX_CHECK([ac_cv_func_std_isnan_in_cmath],
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[std::isnan], [<cmath>],
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[float f; std::isnan(f);])
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if test "$ac_cv_func_std_isnan_in_cmath" = "yes" ; then
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AC_DEFINE([HAVE_STD_ISNAN_IN_CMATH],1,[Set to 1 if the std::isnan function is found in <cmath>])