Language: C++

// 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.
  */

// Also writing "using namespace std;" here so that you dont need to write it everytime you start a cpp file

using namespace std;


  // 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>
  #include <cinttypes>
  #include <cstdbool>
  #include <cstdint>
  #include <ctgmath>
  #include <cwchar>
  #include <cwctype>
  #endif

  // C++
  #include <algorithm>
  #include <bitset>
  #include <complex>
  #include <deque>
  #include <exception>
  #include <fstream>
  #include <functional>
  #include <iomanip>
  #include <ios>
  #include <iosfwd>
  #include <iostream>
  #include <istream>
  #include <iterator>
  #include <limits>
  #include <list>
  #include <locale>
  #include <map>
  #include <memory>
  #include <new>
  #include <numeric>
  #include <ostream>
  #include <queue>
  #include <set>
  #include <sstream>
  #include <stack>
  #include <stdexcept>
  #include <streambuf>
  #include <string>
  #include <typeinfo>
  #include <utility>
  #include <valarray>
  #include <vector>

  #if __cplusplus >= 201103L
  #include <array>
  #include <atomic>
  #include <chrono>
  #include <condition_variable>
  #include <forward_list>
  #include <future>
  #include <initializer_list>
  #include <mutex>
  #include <random>
  #include <ratio>
  #include <regex>
  #include <scoped_allocator>
  #include <system_error>
  #include <thread>
  #include <tuple>
  #include <typeindex>
  #include <type_traits>
  #include <unordered_map>
  #include <unordered_set>
  #endif

Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status