1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_cxx_namespaces.html
3 # ===========================================================================
11 # If the compiler can prevent names clashes using namespaces, define
16 # Copyright (c) 2008 Todd Veldhuizen
17 # Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
18 # Copyright (c) 2013 Bastien Roucaries <roucaries.bastien+autoconf@gmail.com>
20 # Copying and distribution of this file, with or without modification, are
21 # permitted in any medium without royalty provided the copyright notice
22 # and this notice are preserved. This file is offered as-is, without any
27 AU_ALIAS([AC_CXX_NAMESPACES], [AX_CXX_NAMESPACES])
28 AC_DEFUN([AX_CXX_NAMESPACES],
29 [AC_CACHE_CHECK(whether the compiler implements namespaces,
32 AC_COMPILE_IFELSE([AC_LANG_SOURCE([namespace Outer { namespace Inner { int i = 0; }}
33 using namespace Outer::Inner; int foo(void) { return i;} ])],
34 ax_cv_cxx_namespaces=yes, ax_cv_cxx_namespaces=no)
37 if test "$ax_cv_cxx_namespaces" = yes; then
38 AC_DEFINE(HAVE_NAMESPACES,,[define if the compiler implements namespaces])