将错误与Qt5和c ++ 11链接 - Q_COMPILER_REF_QUALIFIERS [英] Linking error with Qt5 and c++ 11 -- Q_COMPILER_REF_QUALIFIERS

问题描述

我在Qt5（Ubuntu 64bit）中有一个C ++项目。它在我的电脑上正常运行。

我刚刚在我的电脑上重新安装了ubuntu 14.10。我还安装了所有必需的软件包（Qt，其他库）但重建项目时有很多链接错误。



qstring.h：错误：未定义引用` QString :: toUtf8_helper（QString const&）'

qimage.h：错误：未定义引用`QImage :: rgbSwapped_helper（）const'

qpixmap.h：错误：未定义引用`QPixmap :: fromImageInPlace（QImage&，QFlags< qt :: imageconversionflag xmlns：qt =＃unknown>）'



错误：未定义引用to`QString :: toLocal8Bit_helper（QChar const *，int）'

.......



在qstring.h中，该行包含错误：



#if定义（Q_COMPILER_REF_QUALIFIERS）&& ！定义（QT_COMPILING_QSTRING_COMPAT_CPP）

QByteArray toLatin1（）const& Q_REQUIRED_RESULT

{return toLatin1_helper（* this）; }

................................

＃否则

QByteArray toLatin1（）const Q_REQUIRED_RESULT;

.......................... .......................

#endif



我的项目使用C ++ 11（我在.pro文件中添加了config + = c ++ 11）。我认为它会导致这些错误。我试过#undef Q_COMPILER_REF_QUALIFIERS但没有工作。



有人能帮助我吗？谢谢！

I have a project C++ in Qt5 (Ubuntu 64bit). It ran normally on my computer.
I have just reinstalled ubuntu 14.10 on my computer. I have also installed all necessary packages (Qt, other libraries) but there are many linking errors when rebuilding my project.

qstring.h: error: undefined reference to `QString::toUtf8_helper(QString const&)'
qimage.h: error: undefined reference to `QImage::rgbSwapped_helper() const'
qpixmap.h: error: undefined reference to `QPixmap::fromImageInPlace(QImage&, QFlags<qt::imageconversionflag xmlns:qt="#unknown">)'

error: undefined reference to `QString::toLocal8Bit_helper(QChar const*, int)'
.......

In qstring.h, the line contains errors :

#if defined(Q_COMPILER_REF_QUALIFIERS) && !defined(QT_COMPILING_QSTRING_COMPAT_CPP)
QByteArray toLatin1() const & Q_REQUIRED_RESULT
{ return toLatin1_helper(*this); }
................................
#else
QByteArray toLatin1() const Q_REQUIRED_RESULT;
.................................................
#endif

My project use C++ 11 ( I have added config += c++11 in .pro file).I think it causes these errors. I tried #undef Q_COMPILER_REF_QUALIFIERS but not working.

Can anybody help me ? Thanks !

推荐答案

Q_COMPILER_REF_QUALIFIERS 根据使用情况在 qcompilerdetection.h 中设置编译器和常规设置。因此不应该更改。



要忽略该设置，请定义 QT_COMPILING_QSTRING_COMPAT_CPP （如您的摘录所示） qstring.h 的）。可能还需要定义其他兼容性定义，例如 QT_COMPILING_QIMAGE_COMPAT_CPP 。

Q_COMPILER_REF_QUALIFIERS is set in qcompilerdetection.h according to the used compiler and general settings. So it should not be changed.

To ignore the setting, define QT_COMPILING_QSTRING_COMPAT_CPP (as indicated by your excerpt from qstring.h). It may be also necessary to define other compatibility definitions like QT_COMPILING_QIMAGE_COMPAT_CPP.

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