2023-10-20 13:59:09 +00:00
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# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_cxx_namespaces.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CXX_NAMESPACES
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#
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# DESCRIPTION
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#
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# If the compiler can prevent names clashes using namespaces, define
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# HAVE_NAMESPACES.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Todd Veldhuizen
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# Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
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# Copyright (c) 2013 Bastien Roucaries <roucaries.bastien+autoconf@gmail.com>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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2019-12-13 04:29:58 +00:00
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2023-10-20 13:59:09 +00:00
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#serial 9
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AU_ALIAS([AC_CXX_NAMESPACES], [AX_CXX_NAMESPACES])
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AC_DEFUN([AX_CXX_NAMESPACES],
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[AC_CACHE_CHECK(whether the compiler implements namespaces,
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ax_cv_cxx_namespaces,
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[AC_LANG_PUSH([C++])
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([namespace Outer { namespace Inner { int i = 0; }}
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using namespace Outer::Inner; int foo(void) { return i;} ])],
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ax_cv_cxx_namespaces=yes, ax_cv_cxx_namespaces=no)
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AC_LANG_POP
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])
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if test "$ax_cv_cxx_namespaces" = yes; then
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AC_DEFINE(HAVE_NAMESPACES,,[define if the compiler implements namespaces])
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fi
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2019-12-13 04:29:58 +00:00
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])
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