/usr/lib/llvm-3.1/build/autoconf/m4/func_isnan.m4 is in llvm-3.1-dev 3.1-2ubuntu1~12.04.1.
This file is owned by root:root, with mode 0o644.
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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([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
])
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