I'm a Mac OS X Lion user who uses Xcode for C++, and it appears that no updates are available for Xcode. I do not appear to be able to compile C++11-exclusive code, but for whatever reason, I thought Apple had gotten C++11 pretty much implemented. And yes, I do have support for Command Line Tools.
Then again, that might just be me. If so, is there any sort of IDE that supports C++11, or any way to upgrade?
I use Xcode and set the following settings:
C++ language dialect: C++11 or GNU++11
C++ Standart Library: libc++ (LLVM C++ standart library with C++11 support)
Xcode version: 4.3.2
If you're using Xcode 4.3 there are several relevant project settings you need to use C++11 features. The first is to use the clang compiler. Something like
GCC_VERSION = com.apple.compilers.llvm.clang.1_0
in your .xcconfig will set it, or you can use the GUI.
Next, you need to tell LLVM which C++ standard to use:
CLANG_CXX_LANGUAGE_STANDARD = gnu++11
This will make language features like range based for, delegated constructors, etc. available.
Finally, if you want to use C++11 STL features (such as std::unordered_map) you need to use the libc++ STL:
CLANG_CXX_LIBRARY = libc++
On XCode 5 / opencv 2.4.9, I can select:
And it builds without error. If i set the libc++ without specifying C++ Language Dialect then I get same issue as OP
来源：https://stackoverflow.com/questions/10438253/im-having-some-trouble-with-c11-in-xcode