freebsd-nq/contrib/llvm/autoconf/m4/func_isnan.m4
Roman Divacky f22ef01c33 Import LLVM/clang from vendor stripped of docs/ test/ website/ www/ examples/
in llvm/ and/or llvm/contrib/clang/ respectively.

Approved by:	ed (mentor)
Approved by:	core
2010-06-09 17:59:52 +00:00

28 lines
986 B
Plaintext

#
# 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
])