dnl @synopsis AC_CXX_NAMESPACES dnl dnl If the compiler can prevent names clashes using namespaces, define dnl HAVE_NAMESPACES. dnl dnl @version $Id: ac_cxx_namespaces.m4,v 1.1.1.1 2003/03/19 02:40:00 mes5k Exp $ dnl @author Luc Maisonobe dnl AC_DEFUN([AC_CXX_NAMESPACES], [AC_CACHE_CHECK(whether the compiler implements namespaces, ac_cv_cxx_namespaces, [AC_LANG_SAVE AC_LANG_CPLUSPLUS AC_TRY_COMPILE([namespace Outer { namespace Inner { int i = 0; }}], [using namespace Outer::Inner; return i;], ac_cv_cxx_namespaces=yes, ac_cv_cxx_namespaces=no) AC_LANG_RESTORE ]) if test "$ac_cv_cxx_namespaces" = yes; then AC_DEFINE(HAVE_NAMESPACES,1,[define to 1 if the compiler implements namespaces]) fi ])