Question

如果我将-std=c++0x指定为g ++，那么我不能#include <iostream>。我收到以下错误消息（mingw下的g ++ 4.4.0）：

In file included from c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/bits/postypes.h:42,
                 from c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/iosfwd:42,
                 from c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/ios:39,
                 from c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/ostream:40,
                 from c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/iostream:40,
                 from f.cpp:1:
c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cwchar:159: error: '::swprintf' has not been declared
c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cwchar:166: error: '::vswprintf' has not been declared

任何想法为什么？这是在最新的g ++中修复的吗？（如果是这样，有人知道如何将最新的g ++纳入Qt吗？）

Answer 1

似乎是bug。有一个thread有一个简单的补丁（最后）。

Answer 2

if win32{
    QMAKE_CXXFLAGS += -std=gnu++0x
}
else {
    QMAKE_CXXFLAGS += -std=c++0x
}

`#include <iostream>`与`-std = c ++ 0x`被打破</iostream>

2 个答案: