Qt：CONFIG += C++11，但 -std=c++0x
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/19523412/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Qt: CONFIG += C++11, but -std=c++0x
提问by Horst Walter
When I compile a project under Qt Creator 2.8 / Qt5.1with VS 2010 all is fine. If I do the same with MinGW I get the following error.
当我使用 VS 2010在Qt Creator 2.8 / Qt5.1下编译项目时一切正常。如果我对 MinGW 做同样的事情，我会收到以下错误。
error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
I understand I need to enable C+11, but I have CONFIG += console c++11in my .pro file. Is this not what is needed? What am I doing wrong?
我知道我需要启用 C+11，但CONFIG += console c++11我的 .pro 文件中有。这不是需要的吗？我究竟做错了什么？
When I look at the make I see:
当我查看品牌时，我看到：
CXXFLAGS = -pipe -fno-keep-inline-dllexport -g -std=c++0x
Confusing, as I say c++11 in the pro file.
令人困惑，正如我在 pro 文件中所说的 c++11。
- Have deleted everything, run
qmakeetc, from the scratch, no result - As said, with VS2010 it works
- Using the MinGW with gcc 4.8.0 from here. http://qt-project.org/downloads
- If this matters, Win7 32
qmake从头开始删除所有内容，运行等，没有结果- 如上所述，使用 VS2010 它可以工作
- 从这里使用带有 gcc 4.8.0 的 MinGW。http://qt-project.org/downloads
- 如果这很重要，Win7 32
Checked:
检查：
- No ANSI: c++11 #include <thread> gives compile error
- std=c+11 MinGW: C++11 functionality with MinGW
- 没有 ANSI：c++11 #include <thread> 给出编译错误
- std=c+11 MinGW：MinGW 的C++11 功能
Found solution, but can only accept it in some time: https://stackoverflow.com/a/19530028/356726
找到解决方案，但只能在一段时间内接受：https: //stackoverflow.com/a/19530028/356726
采纳答案by Horst Walter
Ok, thanks to your hints I have figured it out.
好的，多亏了你的提示，我已经弄清楚了。
After I have tried any possible advice from above, with still no success, I have excluded any subproject I could think of in my project. Eventually I have found a QML sample .pro which did not have CONFIG += c++11defined.
在我尝试了上面的任何可能的建议后，仍然没有成功，我已经排除了我可以在我的项目中想到的任何子项目。最终我找到了一个没有CONFIG += c++11定义的 QML 示例 .pro 。
That was causing the error. So the root cause was not the project I was working on, but a subproject which however got compiled in the same step.
那是导致错误的原因。所以根本原因不是我正在处理的项目，而是一个在同一步骤中编译的子项目。
回答by Michael Burr
Try changing the mkspecs/win32-g++/qmake.confline that says:
尝试更改以下mkspecs/win32-g++/qmake.conf行：
QMAKE_CXXFLAGS_CXX11 = -std=c++0x
to:
到：
QMAKE_CXXFLAGS_CXX11 = -std=c++11
and re-run qmake.
并重新运行qmake。
Some additional details:
一些额外的细节：
Adding the "c++11" feature to the CONFIGqmake variable causes the mkspecs/features/c++11.prffile to be pulled in (see the "Adding New Configuration Features" section of the qmake Advanced Usagedocument for details).
将“c++11”功能添加到CONFIGqmake 变量会导致mkspecs/features/c++11.prf文件被拉入（有关详细信息，请参阅qmake 高级用法文档的“添加新配置功能”部分）。
That qmake profile has a QMAKE_CXXFLAGS += $$QMAKE_CXXFLAGS_CXX11line among other things which configure C++11 support. So adding "c++11" to the CONFIG variable is the proper way to indicate that you want c++11 support to qmake, as you mentioned in a comment.
该 qmake 配置文件有QMAKE_CXXFLAGS += $$QMAKE_CXXFLAGS_CXX11一行配置 C++11 支持。因此，正如您在评论中提到的那样，将“c++11”添加到 CONFIG 变量是表明您希望 c++11 支持 qmake 的正确方法。
回答by TonyK
I am using Qt Creator 2.7.2, and I have this line in my .pro file:
我正在使用 Qt Creator 2.7.2，并且我的 .pro 文件中有这一行：
QMAKE_CXXFLAGS += -std=c++11
Does this work for you?
这对你有用吗？
回答by edwinc
qmake will use whatever flags one has for c++11. So you can overwrite them like:
qmake 将使用 c++11 的任何标志。所以你可以像这样覆盖它们：
unix:QMAKE_CXXFLAGS_CXX11 = -std=c++11
unix:QMAKE_CXXFLAGS_CXX11 = -std=c++11
CONFIG *= c++11
配置 *= c++11
You can even tell it to use -std=c++14 or -std=c++17 instead when c++11 is added to the config as older qmake's might not be aware of them.
您甚至可以告诉它在将 c++11 添加到配置时使用 -std=c++14 或 -std=c++17 代替，因为较旧的 qmake 可能不知道它们。
