| # =========================================================================== |
| # https://www.gnu.org/software/autoconf-archive/ax_cxx_namespaces.html |
| # =========================================================================== |
| # |
| # SYNOPSIS |
| # |
| # AX_CXX_NAMESPACES |
| # |
| # DESCRIPTION |
| # |
| # If the compiler can prevent names clashes using namespaces, define |
| # HAVE_NAMESPACES. |
| # |
| # LICENSE |
| # |
| # Copyright (c) 2008 Todd Veldhuizen |
| # Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org> |
| # Copyright (c) 2013 Bastien Roucaries <roucaries.bastien+autoconf@gmail.com> |
| # |
| # 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 9 |
| |
| AU_ALIAS([AC_CXX_NAMESPACES], [AX_CXX_NAMESPACES]) |
| AC_DEFUN([AX_CXX_NAMESPACES], |
| [AC_CACHE_CHECK(whether the compiler implements namespaces, |
| ax_cv_cxx_namespaces, |
| [AC_LANG_PUSH([C++]) |
| AC_COMPILE_IFELSE([AC_LANG_SOURCE([namespace Outer { namespace Inner { int i = 0; }} |
| using namespace Outer::Inner; int foo(void) { return i;} ])], |
| ax_cv_cxx_namespaces=yes, ax_cv_cxx_namespaces=no) |
| AC_LANG_POP |
| ]) |
| if test "$ax_cv_cxx_namespaces" = yes; then |
| AC_DEFINE(HAVE_NAMESPACES,,[define if the compiler implements namespaces]) |
| fi |
| ]) |
