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- # ===========================================================================
- # https://www.gnu.org/software/autoconf-archive/ax_cxx_namespaces.html
- # ===========================================================================
- #
- # SYNOPSIS
- #
- # AX_CXX_NAMESPACES
- #
- # DESCRIPTION
- #
- # If the compiler can prevent names clashes using namespaces, define
- # HAVE_NAMESPACES.
- #
- # LICENSE
- #
- # Copyright (c) 2008 Todd Veldhuizen
- # Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
- # Copyright (c) 2013 Bastien Roucaries <roucaries.bastien+autoconf@gmail.com>
- #
- # Copying and distribution of this file, with or without modification, are
- # permitted in any medium without royalty provided the copyright notice
- # and this notice are preserved. This file is offered as-is, without any
- # warranty.
-
- #serial 9
-
- AU_ALIAS([AC_CXX_NAMESPACES], [AX_CXX_NAMESPACES])
- AC_DEFUN([AX_CXX_NAMESPACES],
- [AC_CACHE_CHECK(whether the compiler implements namespaces,
- ax_cv_cxx_namespaces,
- [AC_LANG_PUSH([C++])
- AC_COMPILE_IFELSE([AC_LANG_SOURCE([namespace Outer { namespace Inner { int i = 0; }}
- using namespace Outer::Inner; int foo(void) { return i;} ])],
- ax_cv_cxx_namespaces=yes, ax_cv_cxx_namespaces=no)
- AC_LANG_POP
- ])
- if test "$ax_cv_cxx_namespaces" = yes; then
- AC_DEFINE(HAVE_NAMESPACES,,[define if the compiler implements namespaces])
- fi
- ])
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