| # Checks whether the compiler implements namespaces |
| 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 if the compiler implements namespaces]) |
| fi]) |
