39 lines
1.2 KiB
Plaintext
39 lines
1.2 KiB
Plaintext
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# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_cxx_namespace_std.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CXX_NAMESPACE_STD
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#
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# DESCRIPTION
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#
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# If the compiler supports namespace std, define HAVE_NAMESPACE_STD.
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#
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# LICENSE
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#
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# Copyright (c) 2009 Todd Veldhuizen
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# Copyright (c) 2009 Luc Maisonobe <luc@spaceroots.org>
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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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#serial 8
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AU_ALIAS([AC_CXX_NAMESPACE_STD], [AX_CXX_NAMESPACE_STD])
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AC_DEFUN([AX_CXX_NAMESPACE_STD], [
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AC_CACHE_CHECK(if g++ supports namespace std,
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ax_cv_cxx_have_std_namespace,
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[AC_LANG_PUSH([C++])
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <iostream>
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std::istream& is = std::cin;]], [])],
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[ax_cv_cxx_have_std_namespace=yes], [ax_cv_cxx_have_std_namespace=no])
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AC_LANG_POP([C++])
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])
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if test "$ax_cv_cxx_have_std_namespace" = yes; then
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AC_DEFINE(HAVE_NAMESPACE_STD,,[Define if g++ supports namespace std. ])
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fi
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])
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