blocks|key|185284|text|XCode在编译时使用clang和clang%2B%2B，而不是g%2B%2B+(假设您没有自定义内容)。相反，请尝试：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|185285|$+cat+t.cpp
#include+<iostream>

int+main()
{
++++int*+p+=+nullptr;
++++std::cout+<<+p+<<+std::endl;
}
$+clang%2B%2B+-std=c%2B%2B11+-stdlib=libc%2B%2B+t.cpp
$+./a.out+
0x0|code-block|syntax|javascript|185286|感谢bames53指出我遗漏了-stdlib=libc%2B%2B。|185287|如果您想使用一些GNU扩展(也使用C%2B%2B11)，您可以使用-std=gnu%2B%2B11而不是-std=c%2B%2B11，这将打开C%2B%2B11模式并保持启用GNU扩展。|185288|entityMap^0|B|5|H|7|S|3|0|0|F|E|0|T|C|18|A|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|P|$]]

XCode uses <code>clang</code> and <code>clang++</code> when compiling, not <code>g++</code> (assuming you haven't customized things). Instead, try:

<pre><code>$ cat t.cpp
#include &lt;iostream&gt;

int main()
{
 int* p = nullptr;
 std::cout &lt;&lt; p &lt;&lt; std::endl;
}
$ clang++ -std=c++11 -stdlib=libc++ t.cpp
$ ./a.out 
0x0
</code></pre>

Thanks to bames53's answer for pointing out that I had left out <code>-stdlib=libc++</code>.

If you want to use some GNU extensions (and also use C++11), you can use <code>-std=gnu++11</code> instead of <code>-std=c++11</code>, which will turn on C++11 mode and also keep GNU extensions enabled.

blocks|key|403446|text|正如其他人指出的那样，您应该使用clang%2B%2B而不是g%2B%2B。另外，您应该使用libc%2B%2B库，而不是默认的libstdc%2B%2B；包含的libstdc%2B%2B版本非常旧，因此不包含C%2B%2B11库特性。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|403447|clang%2B%2B+-std=c%2B%2B11+-stdlib=libc%2B%2B+-Weverything+main.cpp|code-block|syntax|javascript|403448|如果您还没有安装Xcode的命令行工具，那么可以不使用xcrun工具来运行编译器和其他工具。|403449|xcrun+clang%2B%2B+-std=c%2B%2B11+-stdlib=libc%2B%2B+-Weverything+main.cpp|403450|此外，如果您想禁用某个特定的警告，可以将额外的标志传递给编译器来执行此操作。在警告消息的末尾，它会向您显示启用警告的最具体的标志。要禁用该警告，您可以在警告名称前面加上no-。|403451|例如，您可能不希望出现c%2B%2B98兼容性警告。在这些警告的末尾，它显示标志-Wc%2B%2B98-compat，要禁用它们，您可以传递-Wno-c%2B%2B98-compat。|403452|entityMap^0|G|7|Q|3|0|0|R|5|0|0|2C|3|0|10|E|1Q|H|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|T|$]]

As others have pointed out you should use <code>clang++</code> rather than <code>g++</code>. Also, you should use the libc++ library instead of the default libstdc++; The included version of libstdc++ is quite old and therefore does not include C++11 library features.

<pre><code>clang++ -std=c++11 -stdlib=libc++ -Weverything main.cpp
</code></pre>

If you haven't installed the command line tools for Xcode you can run the compiler and other tools without doing that by using the <code>xcrun</code> tool.

<pre><code>xcrun clang++ -std=c++11 -stdlib=libc++ -Weverything main.cpp
</code></pre>

Also if there's a particular warning you want to disable you can pass additional flags to the compiler to do so. At the end of the warning messages it shows you the most specific flag that would enable the warning. To disable that warning you prepend <code>no-</code> to the warning name.

For example you probably don't want the c++98 compatibility warnings. At the end of those warnings it shows the flag <code>-Wc++98-compat</code> and to disable them you pass <code>-Wno-c++98-compat</code>.

I wanted to compile C++11 source code within Mac Terminal but failed. I tried <code>g++ -std=c++11</code>, <code>g++ -std=c++0x</code>, <code>g++ -std=gnu++11</code> and <code>g++ -std=gnu++0x</code> but nothing worked. Terminal always read <code>unrecognized command line option</code>. However, <code>g++ -std=gnu</code> and things like that worked fine (of course C++11 source code could not pass).

Which option should I use to turn on C++11 support?

By the way, the command line tool I'm using is installed within Xcode, and I'm pretty sure that they are up-to-date.

How to compile C++ with C++11 support in Mac Terminal

命令行工具

编译器

Xcode

我想在Mac Terminal中编译C++11源代码，但是失败了。我尝试了g++ -std=c++11，g++ -std=c++0x，g++ -std=gnu++11和g++ -std=gnu++0x，但都不起作用。终端始终读取unrecognized command line option。然而，g++ -std=g...

问如何在Mac终端上编译支持C++11的C++
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