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dnl @synopsis AC_CXX_NAMESPACES
dnl
dnl If the compiler can prevent names clashes using namespaces, define
dnl HAVE_NAMESPACES.
dnl
dnl @category Cxx
dnl @author Todd Veldhuizen
dnl @author Luc Maisonobe <luc@spaceroots.org>
dnl @license AllPermissive
dnl @version 2021-10-02
dnl Marek's 2021-10-02 update: replace obsolete AC_TRY_COMPILE, AC_LANG_CPLUSPLUS
AC_DEFUN([AC_CXX_NAMESPACES],
[AC_CACHE_CHECK(whether the compiler implements namespaces,
ac_cv_cxx_namespaces,
[AC_LANG_SAVE
AC_LANG([C++])
AC_LINK_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_RESTORE
])
if test "$ac_cv_cxx_namespaces" = yes; then
AC_DEFINE(HAVE_NAMESPACES,,[define if the compiler implements namespaces])
fi
])
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