blocks|key|1752931|text|如果使用QtCreator，可以将其添加到.pro文件中：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1752932|CONFIG+%2B=+c%2B%2B11|code-block|syntax|javascript|1752933|项目|1752934|entityMap|0|LINK|mutability|MUTABLE|url|https://wiki.qt.io/How_to_use_C%252B%252B11_in_your_Qt_Projects^0|L|4|0|0|0|2|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

If using QtCreator, you can add this to your <code>.pro</code> file:

<pre><code>CONFIG += c++11
</code></pre>

<a href="https://wiki.qt.io/How_to_use_C%2B%2B11_in_your_Qt_Projects" rel="nofollow noreferrer">https://wiki.qt.io/How_to_use_C%2B%2B11_in_your_Qt_Projects</a>

blocks|key|24558|text|已经有段时间了。我最终是如何解决这个问题的，我在CMakeLists.txt中指出了下面的一行，就在project(MyProject)之后|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|24559|add_compile_options(-std=c%2B%2B11)|code-block|syntax|javascript|24560|这意味着要创建一个Makefile，它将使用c%2B%2B11解决问题。|24561|entityMap^0|O|E|1E|I|0|0|9|8|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|U|8|@]|E|@]|F|$J|K]]|$1|L|3|M|5|6|7|V|8|@$9|W|A|X|B|C]]|E|@]|F|$]]|$1|N|3|-4|5|6|7|Y|8|@]|E|@]|F|$]]]|O|$]]

Its has been a while.
How I finally solve it is indicating in CMakeLists.txt the following line just after <code>project(MyProject)</code>:

<pre><code>add_compile_options(-std=c++11)
</code></pre>

That says to cmake, to create a Makefile that will use c++11 solving issues.

blocks|key|1752873|text|我的解决方案是(在您的.pro文件中)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1752874|QMAKE_CXXFLAGS+%2B=+-stdlib=libc%2B%2B
QMAKE_CXXFLAGS+%2B=+-std=c%2B%2B11
QMAKE_CXXFLAGS+%2B=+-mmacosx-version-min=10.7
QMAKE_LFLAGS+%2B=+-mmacosx-version-min=10.7|code-block|syntax|javascript|1752875|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

solution for me was (in your .pro file): 

<pre><code>QMAKE_CXXFLAGS += -stdlib=libc++
QMAKE_CXXFLAGS += -std=c++11
QMAKE_CXXFLAGS += -mmacosx-version-min=10.7
QMAKE_LFLAGS += -mmacosx-version-min=10.7
</code></pre>

blocks|key|2401702|text|显式地打开c%2B%2B11：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2401703|set(CMAKE_CXX_FLAGS+"-std=c%2B%2B11"+CACHE+STRING+"compile+flags"+FORCE)在project(...)声明之后。|ordered-list-item|offset|length|style|CODE|2401704|add_library(MyLib+SHARED+${PROJECT_HEADERS}+${PROJECT_SOURCES})+...+set_property(TARGET+MyLib+PROPERTY+CXX_STANDARD+11)+set_property(TARGET+MyLib+PROPERTY+CXX_STANDARD_REQUIRED+ON)|2401705|entityMap^0|0|0|1W|1X|C|0|0|50|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@$E|O|F|P|G|H]|$E|Q|F|R|G|H]]|9|@]|A|$]]|$1|I|3|J|5|D|7|S|8|@$E|T|F|U|G|H]]|9|@]|A|$]]|$1|K|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|L|$]]

Turn c++11 on explicitly:

<ol>
<li><code>set(CMAKE_CXX_FLAGS "-std=c++11" CACHE STRING "compile flags" FORCE)</code> after <code>project(...)</code> declaration.</li>
<li><code>add_library(MyLib SHARED ${PROJECT_HEADERS} ${PROJECT_SOURCES})
...
set_property(TARGET MyLib PROPERTY CXX_STANDARD 11)
set_property(TARGET MyLib PROPERTY CXX_STANDARD_REQUIRED ON)
</code></li>
</ol>

blocks|key|2401782|text|有时，这不是其他答案中提到的配置问题。在我的例子中，问题是一个文件碰巧是用.cpp扩展名而不是.CPP保存的。QMake+(Qt5)错误地识别了文件，并试图用C编译器而不是C%2B%2B编译器编译它。来自QMake的Qt4并没有展示这个问题。重命名文件修复了问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2401783|我当时的评论是：“这真的是f&%25&简单吗！”|2401784|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

SOMETIMES, this will not be a configuration issue as mentioned in other answers. In my case, the problem was one file that happened to have been saved with a .CPP extension rather than .cpp. QMake (Qt5) was misidentifying the file and trying to compile it with the C compiler rather than the C++ compiler. The QMake from Qt4 was not exhibiting this issue. Renaming the file fixed the issue.

My comment at the time was "Could this really be that f&amp;%%&amp; simple!!"

I used Qt 5.7 and gcc 4.9.2. Qt Core module throw <code>Qt requires C++11 support</code> error.

<a href="https://wiki.qt.io/Qt_5.7.0_Known_Issues" rel="noreferrer">This page</a> say that 

<blockquote>
 gcc 4.9.2 fails to compile Qt.
</blockquote>

So I installed gcc 4.8. I check using below command on terminal : 

<pre><code>$ g++ --version
g++ (Ubuntu 4.8.4-1ubuntu15) 4.8.4
</code></pre>

My kit uses cmake not qmake. I add <code>TARGET_LINK_LIBRARIES ( xxxx yyyy /usr/bin/c++ -std=c++11</code> to CMakeLists-txt. 

I restart my pc and run my application again. Same error is throwed.

<pre><code>/opt/Qt/5.7/gcc_64/include/QtCore/qbasicatomic.h:61: error: #error "Qt requires C++11 support"
 # error "Qt requires C++11 support"
 ^
</code></pre>

How can I solve it?

Qt requires C++11 support

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我用QT5.7和gcc 4.9.2。Qt模块抛出Qt requires C++11 support错误。说gcc 4.9.2未能编译Qt。所以我安装了gcc 4.8。我在终端上使用以下命令进行检查：$ g++ --versiong++ (Ubuntu 4.8.4-1ubuntu15) 4.8.4我的工具箱使用的是cmake而不是qmake。我将TARGET_LINK_LIBRARIES ( xxx

问Qt需要C++11支持
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