| # Check for C++ namespace support. This is from |
| # http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_namespaces.html |
| # |
| AC_DEFUN([AC_CXX_NAMESPACES], |
| [AC_CACHE_CHECK(whether the compiler implements namespaces, |
| ac_cv_cxx_namespaces, |
| [AC_LANG_PUSH([C++]) |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM( |
| [[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_POP([C++]) |
| ]) |
| if test "$ac_cv_cxx_namespaces" = yes; then |
| AC_DEFINE(HAVE_NAMESPACES,,[define if the compiler implements namespaces]) |
| fi |
| ]) |
| |