g++ std=c++98 不能在 MinGW 中编译

Question

这是我的代码：

main.cpp

#include <iostream>
#include <cmath>
using namespace std;
    
int main()
{
    cout << pow(4, 3);
    cin.get();      
}

所以基本上我尝试使用命令g++ main.cpp -std=c++98进行编译

这是我得到的：

    C:\Users\NullPointerException\Desktop\cpp>g++ main.cpp -std=c++98
    In file included from c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\bits\postypes.h:40,
                     from c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\iosfwd:40,
                     from c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\ios:38,
                     from c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\ostream:38,
                     from c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\iostream:39,
                     from main.cpp:1:
    c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\cwchar:166:11: error: '::vfwscanf' has not been declared
      166 |   using ::vfwscanf;
          |           ^~~~~~~~
    c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\cwchar:172:11: error: '::vswscanf' has not been declared
      172 |   using ::vswscanf;
          |           ^~~~~~~~
    c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\cwchar:176:11: error: '::vwscanf' has not been declared
      176 |   using ::vwscanf;
          |           ^~~~~~~
    c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\cwchar:193:11: error: '::wcstof' has not been declared
      193 |   using ::wcstof;
          |           ^~~~~~
    In file included from c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\bits\locale_facets.h:39,
                     from c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\bits\basic_ios.h:37,
                     from c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\ios:44,
                     from c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\ostream:38,
                     from c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\iostream:39,
                     from main.cpp:1:
    c:\mingw\lib\gcc\mingw32\9.2.0\include\c++\cwctype:89:11: error: '::iswblank' has not been declared
       89 |   using ::iswblank;
          |           ^~~~~~~~

基本上我想测试 c++ 是否可以推断pow 的类型。但我得到了这些错误。有什么问题，我该如何解决？

g++ 版本：9.2.0

Answer 1

我可以在 ubuntu 上使用 g++ 9.3 毫无问题地编译它。似乎您遇到了特定于 g++ mingw32 变体的错误。 您可以尝试在其他包含之前添加include <cstdio> 和include <cstdarg>。 因为我没有使用 mingw32，所以我无法对此进行测试。

Answer 2

pow 是 C 函数，而不是 C++，因此请使用数学库的替代 C 头文件。