文件操作 - ax_cxx_namespace_std.m4
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文件: /usr/share/aclocal/ax_cxx_namespace_std.m4
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# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_cxx_namespace_std.html # =========================================================================== # # SYNOPSIS # # AX_CXX_NAMESPACE_STD # # DESCRIPTION # # If the compiler supports namespace std, define HAVE_NAMESPACE_STD. # # LICENSE # # Copyright (c) 2009 Todd Veldhuizen # Copyright (c) 2009 Luc Maisonobe <luc@spaceroots.org> # # 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 7 AU_ALIAS([AC_CXX_NAMESPACE_STD], [AX_CXX_NAMESPACE_STD]) AC_DEFUN([AX_CXX_NAMESPACE_STD], [ AC_CACHE_CHECK(if g++ supports namespace std, ax_cv_cxx_have_std_namespace, [AC_LANG_SAVE AC_LANG_CPLUSPLUS AC_TRY_COMPILE([#include <iostream> std::istream& is = std::cin;],, ax_cv_cxx_have_std_namespace=yes, ax_cv_cxx_have_std_namespace=no) AC_LANG_RESTORE ]) if test "$ax_cv_cxx_have_std_namespace" = yes; then AC_DEFINE(HAVE_NAMESPACE_STD,,[Define if g++ supports namespace std. ]) fi ])
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