无法解析 cc1plus：错误：无法识别的命令行选项“-std=c++11”

Question

我尝试使用“g++ -std=c++11 -o w w.cpp”编译下面的程序并得到错误“cc1plus: error: unrecognized command line option“-std=c++11””。 尝试使用 g++ -Dstd=c++11 -o w w.cpp 编译并得到以下错误集：

In file included from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/iosfwd:41,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/ios:39,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/ostream:40,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/iostream:40,
                 from w.cpp:1:
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stringfwd.h:42: error: expected ‘{’ before ‘++’ token
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stringfwd.h:42: error: expected unqualified-id before ‘++’ token
In file included from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/cwchar:44,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/postypes.h:42,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/iosfwd:42,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/ios:39,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/ostream:40,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/iostream:40,
                 from w.cpp:1:
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/cstddef:49: error: expected ‘{’ before ‘++’ token
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/cstddef:49: error: expected unqualified-id before ‘++’ token
In file included from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/postypes.h:42,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/iosfwd:42,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/ios:39,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/ostream:40,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/iostream:40,
                 from w.cpp:1:
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/cwchar:65: error: expected ‘{’ before ‘++’ token
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/cwchar:65: error: expected unqualified-id before ‘++’ token
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/cwchar:139: error: expected ‘{’ before ‘++’ token
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/cwchar:139: error: expected unqualified-id before ‘++’ token
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/cwchar:245: error: ‘::wcstold’ has not been declared
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/cwchar:254: error: ‘::wcstoll’ has not been declared
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/cwchar:255: error: ‘::wcstoull’ has not been declared
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/cwchar:260: error: expected ‘{’ before ‘++’ token
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/cwchar:260: error: expected unqualified-id before ‘++’ token
In file included from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/iosfwd:42,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/ios:39,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/ostream:40,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/iostream:40,
                 from w.cpp:1:
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/postypes.h:70: error: expected ‘{’ before ‘++’ token
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/postypes.h:70: error: expected unqualified-id before ‘++’ token
In file included from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/ios:40,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/ostream:40,
                 from /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/iostream:40,
                 from w.cpp:1:
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/exception:35: error: expected ‘}’ before end of line
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/exception:35: error: expected ‘}’ before end of line
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/exception:35: error: expected ‘}’ before end of line
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/exception:35: error: expected ‘}’ before end of line
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/exception:35: error: expected ‘}’ before end of line
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/exception:35: error: expected ‘}’ before end of line
/usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/exception:35: error: expected declaration before end of line

program- w.cpp

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <map>

using namespace std;

int read_words(vector<string>& words, ifstream& in)
{
  int i = 0;
  while(!in.eof())
    in >> words[i++];
  return i-1;
}

int main()
{
  ifstream ifp("names");

  vector<string> w(500);
  int number_of_words = read_words(w, ifp);
  w.resize(number_of_words);

  for(auto it : w)
    cout << it << " ";
  cout << endl;

  map<string, string> wMap;

  for(int i = 0; i  <  number_of_words;) {
    wMap.insert(pair<string, string>(w[i], w[i+1]));
    i += 2;
  }

  cout << "wMap.size()=" << wMap.size() << endl;
  for(auto it = wMap.begin(); it != wMap.end(); it++)
    cout <<  it->first << " " << it->second << endl;
}

gcc 版本： gcc (GCC) 4.4.7 20120313 (红帽 4.4.7-3) g++ (GCC) 4.4.7 20120313（红帽 4.4.7-3）

请帮我找出这个问题。

Answer 1

-std=c++11 仅受 GCC 4.7 及更高版本支持。对于其他版本，您可以使用std=c++0x（自 GCC 4.3 起可用）。有关不同 GCC 版本中 C++11 支持的更多信息，请参阅 GCC 在 ‘C++0x/C++11 Support in GCC’ 上的概述。

Answer 2

对于低于 4.7 的 gcc 版本，您需要使用 -std=c++0x