| # =========================================================================== |
| # https://www.gnu.org/software/autoconf-archive/ax_cxx_namespace_std.html |
| # =========================================================================== |
| # |
| # SYNOPSIS |
| # |
| # AX_CXX_NAMESPACE_STD |
| # |
| # DESCRIPTION |
| # |
| # If the compiler supports namespace std, define HAVE_NAMESPACE_STD. |
| # |
| # LICENSE |
| # |
| # Copyright (c) 2009 Todd Veldhuizen |
| # Copyright (c) 2009 Luc Maisonobe <luc@spaceroots.org> |
| # |
| # Copying and distribution of this file, with or without modification, are |
| # permitted in any medium without royalty provided the copyright notice |
| # and this notice are preserved. This file is offered as-is, without any |
| # warranty. |
| |
| #serial 8 |
| |
| AU_ALIAS([AC_CXX_NAMESPACE_STD], [AX_CXX_NAMESPACE_STD]) |
| AC_DEFUN([AX_CXX_NAMESPACE_STD], [ |
| AC_CACHE_CHECK(if g++ supports namespace std, |
| ax_cv_cxx_have_std_namespace, |
| [AC_LANG_PUSH([C++]) |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <iostream> |
| std::istream& is = std::cin;]], [])], |
| [ax_cv_cxx_have_std_namespace=yes], [ax_cv_cxx_have_std_namespace=no]) |
| AC_LANG_POP([C++]) |
| ]) |
| if test "$ax_cv_cxx_have_std_namespace" = yes; then |
| AC_DEFINE(HAVE_NAMESPACE_STD,,[Define if g++ supports namespace std. ]) |
| fi |
| ]) |
