llvm-6502/autoconf/m4/func_isnan.m4

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#
# This function determines if the isnan function is available on this
# platform.
#
AC_DEFUN([AC_FUNC_ISNAN],[
AC_SINGLE_CXX_CHECK([HAVE_ISNAN_IN_MATH_H], [ac_cv_func_isnan_in_math_h],
[isnan], [<math.h>],
[#include <math.h>
int foo(float f) {return isnan(f);}])
AC_SINGLE_CXX_CHECK([HAVE_ISNAN_IN_CMATH], [ac_cv_func_isnan_in_cmath],
[isnan], [<cmath>],
[#include <cmath>
int foo(float f) {return isnan(f);}])
AC_SINGLE_CXX_CHECK([HAVE_STD_ISNAN_IN_CMATH], [ac_cv_func_std_isnan_in_cmath],
[std::isnan], [<cmath>],
[#include <cmath>
using std::isnan; int foo(float f) {return isnan(f);}])
])