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AC_CXX_NAMESPACE_STD
If the compiler supports namespace std, define HAVE_NAMESPACE_STD.
Todd Veldhuizen and Luc Maisonobe <luc@spaceroots.org>.
2008-04-12
AC_DEFUN([AC_CXX_NAMESPACE_STD], [ AC_CACHE_CHECK(if g++ supports namespace std, ac_cv_cxx_have_std_namespace, [AC_LANG_SAVE AC_LANG_CPLUSPLUS AC_TRY_COMPILE([#include <iostream> std::istream& is = std::cin;],, ac_cv_cxx_have_std_namespace=yes, ac_cv_cxx_have_std_namespace=no) AC_LANG_RESTORE ]) if test "$ac_cv_cxx_have_std_namespace" = yes; then AC_DEFINE(HAVE_NAMESPACE_STD,,[Define if g++ supports namespace std. ]) fi ])
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