C++11 On Android

切换到 cocos2d-x-3.0alpha1 之后编译项目报错如下：
/opt/cocos2dx/projects/MyGame/proj.android/../../../cocos/2d/CCTextureCache.h:192:5: error: 'thread' in namespace 'std' does not name a type
/opt/cocos2dx/projects/MyGame/proj.android/../../../cocos/2d/CCTextureCache.h:197:5: error: 'mutex' in namespace 'std' does not name a type
原来 android-ndk-r8d 不支持c++11，解决办法如下：

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The latest Andoird NDK r8e finally supports some of the most important C++11 library features: thread, mutex, atomic and so on. It is now straightforward to write multi-threaded programs using C++11 on Android, without hacking and jumping through hoops. All you need is downloading NDK r8e.

The most natural way to organize any C/C++ native code for an Android project, is to follow the Google guide: use a jni sub-directory to house Android.mk file (and optionally Application.mk file). The actual source code files, however, could be littered around; just refer them in Android.mk.

To enable C++11 threading, settings in both Application.mk and Android.mk are important. Below is the minimal examples of both files.

Application.mk

In NDK r8e, we have to use GCC 4.7 for C++11 features like thread, mutex, etc.
The default GCC is 4.6, which does NOT define macro _GLIBCXX_HAS_GTHREADS, so you’ll get errors like “mutex in namespace std does not name a type” etc.

NDK_TOOLCHAIN_VERSION := 4.7

GNU STL implements most C++11 features. Use either gnustl_static or gnustl_shared
Without this your C++ code will not be able to access headers like ,

APP_STL := gnustl_static

Use advanced ARM ABI

APP_ABI := armeabi-v7a

And Android.mk:

Regular boilerplate required by NDK

LOCAL_PATH := $(call my-dir) 
include $(CLEAR_VARS)

C++11 and threading enabling features.
Otherwise c++11, pthread, rtti and exceptions are not enabled by default

LOCAL_CPPFLAGS := -std=c++11 -pthread -frtti -fexceptions

LOCAL_ARM_MODE := arm

LOCAL_MODULE    := foo 
LOCAL_SRC_FILES := foo.cpp

include $(BUILD_SHARED_LIBRARY)

Notice the red settings in both files. Now, in foo.cpp, you can include headers like and , and start using std::thread and std::mutex.