1# =========================================================================== 2# http://www.gnu.org/software/autoconf-archive/ax_cxx_namespaces.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_CXX_NAMESPACES 8# 9# DESCRIPTION 10# 11# If the compiler can prevent names clashes using namespaces, define 12# HAVE_NAMESPACES. 13# 14# LICENSE 15# 16# Copyright (c) 2008 Todd Veldhuizen 17# Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org> 18# Copyright (c) 2013 Bastien Roucaries <roucaries.bastien+autoconf@gmail.com> 19# 20# Copying and distribution of this file, with or without modification, are 21# permitted in any medium without royalty provided the copyright notice 22# and this notice are preserved. This file is offered as-is, without any 23# warranty. 24 25#serial 8 26 27AU_ALIAS([AC_CXX_NAMESPACES], [AX_CXX_NAMESPACES]) 28AC_DEFUN([AX_CXX_NAMESPACES], 29[AC_CACHE_CHECK(whether the compiler implements namespaces, 30ax_cv_cxx_namespaces, 31[AC_LANG_PUSH([C++]) 32 AC_COMPILE_IFELSE([AC_LANG_SOURCE([namespace Outer { namespace Inner { int i = 0; }} 33 using namespace Outer::Inner; int foo(void) { return i;} ])], 34 ax_cv_cxx_namespaces=yes, ax_cv_cxx_namespaces=no) 35 AC_LANG_POP 36]) 37if test "$ax_cv_cxx_namespaces" = yes; then 38 AC_DEFINE(HAVE_NAMESPACES,,[define if the compiler implements namespaces]) 39fi 40]) 41