1.终端输入：echo | g++ -v -x c++ -E -
2.切换到上图划红线目录下：
cd /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include
3.新建bits文件夹：
sudo mkdir bits
4.切换到bits文件夹下，新建stdc++.h
sudo touch stdc++.h
5.vim打开stdc++.h，输入一下内容：
// C++ includes used for precompiling -*- C++ -*-
// Copyright (C) 2003-2014 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
//
/** @file stdc++.h
* This is an implementation file for a precompiled header.
*/
// 17.4.1.2 Headers
// C
#ifndef _GLIBCXX_NO_ASSERT
#include
#endif
#include
#include
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#if __cplusplus >= 201103L
#include
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#include
#endif
// C++
#include
#include
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#if __cplusplus >= 201103L
#include
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#endif
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原文链接：https://blog.csdn.net/weixin_44307969/article/details/117870277