1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_cxx_namespace_std.html
3 # ===========================================================================
11 # If the compiler supports namespace std, define HAVE_NAMESPACE_STD.
15 # Copyright (c) 2009 Todd Veldhuizen
16 # Copyright (c) 2009 Luc Maisonobe <luc@spaceroots.org>
18 # Copying and distribution of this file, with or without modification, are
19 # permitted in any medium without royalty provided the copyright notice
20 # and this notice are preserved. This file is offered as-is, without any
25 AU_ALIAS([AC_CXX_NAMESPACE_STD], [AX_CXX_NAMESPACE_STD])
26 AC_DEFUN([AX_CXX_NAMESPACE_STD], [
27 AC_CACHE_CHECK(if g++ supports namespace std,
28 ax_cv_cxx_have_std_namespace,
31 AC_TRY_COMPILE([#include <iostream>
32 std::istream& is = std::cin;],,
33 ax_cv_cxx_have_std_namespace=yes, ax_cv_cxx_have_std_namespace=no)
36 if test "$ax_cv_cxx_have_std_namespace" = yes; then
37 AC_DEFINE(HAVE_NAMESPACE_STD,,[Define if g++ supports namespace std. ])