NDK r12 lost std::mutex

[alexcohn]

Upgraded to r12, and got errors like 'mutex' in namespace 'std' does not name a type. After using the workaround suggested by James Swift, I get undefined reference to 'std::condition_variable::notify_one()'.

Using gnustl_static, NDK_TOOLCHAIN=x86-4.9.

Same library compiles clean with r11.

[DanAlbert]

FYI I have an internal bug open tracking this. It's part of the fallout from synchronizing our GCC with chromeos (solved a bunch of bugs, caused a few more). The detection for _GLIBCXX_HAS_GTHREADS apparently got hacked into place in the NDK a long time ago and we lost the hack in the sync.

[chaoren]

Looks like std::thread is also missing.

$ ~/Android/toolchains/arm/bin/arm-linux-androideabi-clang++ -std=c++11 test.cpp
test.cpp:11:7: error: no member named 'this_thread' in namespace 'std'
        std::this_thread::get_id();
        ~~~~~^
test.cpp:12:7: error: no type named 'mutex' in namespace 'std'
        std::mutex m;
        ~~~~~^
test.cpp:13:7: error: no type named 'thread' in namespace 'std'
        std::thread t;
        ~~~~~^

[DanAlbert]

Yes, everything thread related is probably missing. _GLIBCXX_HAS_GTHREADS isn't getting defined.

(FYI, internal bug is http://b/27433401)

[DanAlbert]

https://android-review.googlesource.com/#/c/219744/