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The C and C++ Include Header Files

cat -n /usr/include/c++/15/bits/c++0x_warning.h

     1	// Copyright (C) 2007-2025 Free Software Foundation, Inc.
     2	//
     3	// This file is part of the GNU ISO C++ Library.  This library is free
     4	// software; you can redistribute it and/or modify it under the
     5	// terms of the GNU General Public License as published by the
     6	// Free Software Foundation; either version 3, or (at your option)
     7	// any later version.
     8	
     9	// This library is distributed in the hope that it will be useful,
    10	// but WITHOUT ANY WARRANTY; without even the implied warranty of
    11	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12	// GNU General Public License for more details.
    13	
    14	// Under Section 7 of GPL version 3, you are granted additional
    15	// permissions described in the GCC Runtime Library Exception, version
    16	// 3.1, as published by the Free Software Foundation.
    17	
    18	// You should have received a copy of the GNU General Public License and
    19	// a copy of the GCC Runtime Library Exception along with this program;
    20	// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    21	// <http://www.gnu.org/licenses/>.
    22	
    23	/** @file bits/c++0x_warning.h
    24	 *  This is an internal header file, included by other library headers.
    25	 *  Do not attempt to use it directly. @headername{iosfwd}
    26	 */
    27	
    28	#ifndef _CXX0X_WARNING_H
    29	#define _CXX0X_WARNING_H 1
    30	
    31	#if __cplusplus < 201103L
    32	#error This file requires compiler and library support \
    33	for the ISO C++ 2011 standard. This support must be enabled \
    34	with the -std=c++11 or -std=gnu++11 compiler options.
    35	#endif
    36	
    37	#endif