将-std = gnu ++ 11编译器标志添加到QMake [英] Adding -std=gnu++11 compiler flag to QMake

问题描述

我正在使用mingw32和g ++在windows上编译qt5.7。
当执行configure.bat时，我得到这个错误：

  C：\ qt-everywhere-opensource- src-5.7.0 \configure.bat -prefix C：\ Qt-5.7 -skip qttools -skip qtwebchannel -skip qtwebengine -skip qtcharts -skip qtdatavis3d -platform win32-g ++ 
  

C：\ qt-everywhere-opensource-src-5.7.0\qtbase / qmake / library / qmakebuiltins。 cpp：在成员函数'QByteArray QMakeEvaluator :: getCommandOutput（const QString&）const'：
C：\ qt-everywhere-opensource-src-5.7.0\qtbase / qmake / library / qmakebuiltins.cpp： 419：94：error：'_popen'未在此范围内声明
+ QLatin1String（&）+ args）.toLocal8Bit（）。constData（），r））{

导致此错误的命令为：

g ++ -c -o qmakebuiltins.o -std = c ++ 11 -DUNICODE -ffunction-sections -g -IC：\ qt-everywhere-opensour ce-src-5.7.0 \ qtbase / qmake +很多东西

另外，下面的代码：

  #include  
 
 main（int argc，char ** argv）
 {
 FILE * f = popen（argv [1]，r）; 
返回0; 
 
  

不能用
$ b $进行编译b

g ++ -std = c ++ 11 mytest.cpp -o mytest

：

 > g ++ -std = gnu ++ 11 mytest.cpp -o mytest 
 谢谢 
 
解决方案
据 CONFIG + = c ++ 11  >。
 
I am compiling qt5.7 on windows with mingw32 and g++.4.9.3. 
While executing the configure.bat, I get this error :
C:\qt-everywhere-opensource-src-5.7.0\configure.bat -prefix C:\Qt-5.7 -skip qttools -skip qtwebchannel -skip qtwebengine -skip qtcharts -skip qtdatavis3d -platform win32-g++



  
C:\qt-everywhere-opensource-src-5.7.0\qtbase/qmake/library/qmakebuiltins.cpp: In member function 'QByteArray QMakeEvaluator::getCommandOutput(const QString&) const':
  C:\qt-everywhere-opensource-src-5.7.0\qtbase/qmake/library/qmakebuiltins.cpp:419:94: error: '_popen' was not declared in this scope
                                  + QLatin1String(" && ") + args).toLocal8Bit().constData(), "r")) {
The command that leads to this error is :

  
g++ -c -o qmakebuiltins.o -std=c++11 -DUNICODE -ffunction-sections -g  -IC:\qt-everywhere-opensource-src-5.7.0\qtbase/qmake + lot of stuff
Also, the following code :
    #include <stdio.h>

int main( int argc, char ** argv )
{
     FILE * f = popen( argv[ 1 ], "r" );
     return 0;
}
doesn't compile with 

  
g++ -std=c++11 mytest.cpp -o mytest
but with :
>g++ -std=gnu++11 mytest.cpp -o mytest
So the question is how can I modify the option c++11 to gnu++11 which is passed to g++ by the configure file ?
Thank you
解决方案
According to Qt's Wiki, with the current version of qmake you are using, you can also use CONFIG += c++11.

                        
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