stdc++.h 文件只是一个有一堆include 。你唯一要做的就是把这个文件放到c++导入文件的默认位置。这里有一个在MacOS中添加它的快速方法。
在安装了XCode之后
在这个路径中创建一个名为stdc++.h 的文件：（你应该先创建bits 文件夹）
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/bits
没有安装XCode
在这个路径下创建一个名为stdc++.h 的文件：（你应该先创建bits 文件夹）。
/usr/local/include/bits
现在，只需在创建的文件中填入以下内容：
// C++ includes used for precompiling -*- C++ -*-
// Copyright (C) 2003-2013 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
// <http://www.gnu.org/licenses/>.
/** @file stdc++.h
* This is an implementation file for a precompiled header.
*/
// 17.4.1.2 Headers
// C
#ifndef _GLIBCXX_NO_ASSERT
#include <cassert>
#endif
#include <cctype>
#include <cerrno>
#include <cfloat>
#include <ciso646>
#include <climits>
#include <clocale>
#include <cmath>
#include <csetjmp>
#include <csignal>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#if __cplusplus >= 201103L
#include <ccomplex>
#include <cfenv>
或者你可以下载该文件并将其放在正确的文件夹中：
mkdir /usr/local/include/bits
curl https://gist.githubusercontent.com/devmarkpro/94d0b20a87bd0cc5f094a9b98336aa6d/raw/724c53e3210029f7bfd5dfa6254d124791547153/stdc++.h > /usr/local/include/bits/stdc++.h
注意：每次更新XCode Command-line Tools ，你都必须重复这些步骤，所以如果你知道这个问题的永久解决方案，请在评论区分享。
