Setting up C++11 (std::thread) for NDK with ADT/Eclipse

Question

I have been trying to use C++11. I am developing an android project and i want to use std::mutex. Along with OpenCV But no matter what I do, I just cant seem to fix the Type 'mutex' could not be resolved error.

I have tried following the tutorials i found on SO and other places. LINK1 LINK2 LINK3LINK4

1. ADT v22.3.0-887826
2. Installed C/C++ compilers (CDT)

Following so many tutorials, it has become a real mess now. So I will explain my current settings

• Project > Properties > C/C++ Build > Tool Chain Editor
  • Current Tool Chain is "Cross GCC"
  • Current Builder is "Android Builder"

• Project > Properties > C/C++ Build > Discovery Options

  • Compiler invocation command is "gcc"
  • Compilter Invocation argments are -E -P -v -dD "${plugin_state_location}/specs.c -std=c++11"

• Project > C/C++ General > Paths and Symbols > # Symbols tab

  • Symbol = __cplusplus and Value = 1

In my Application.mk file I have the following

APP_STL := gnustl_static
APP_USE_CPP0X := true
APP_CPPFLAGS := -std=c++11 -frtti -fexceptions
APP_ABI := armeabi-v7a
APP_PLATFORM := android-8

I tried to change the cplusplus symbol's value to 201103L and tried __GXX_EXPERIMENTAL_CXX0X with an empty value

But nothing seems to work, What am I doing wrong??

Any help is appreciated!

Answer 1

Support for std::thread is a bit special. The issue is addressed, for example, in this article by Binglong. The article is really short, but it can be summarized in one sentence:

You cannot use the (default) gcc 4.6 toolchain if you want to #include <thread> or #include <mutex>.

So, please add NDK_TOOLCHAIN_VERSION=4.8 or NDK_TOOLCHAIN_VERSION=clang to your Application.mk.

For ADT to rebuild its Index correctly, see Android NDK build, Method could not be resolved or Eclipse compiles successfully but still gives semantic errors.

Answer 2

In Android.mk add LOCAL_CPPFLAGS := -std=c++11 -D __cplusplus=201103L then rebuild your project (for reconfiguring compiler). After rebuilding, your project automatically adds needed stl path into Path and Symbols