[r12b] Linker error when using luajit with clang & c++_static

[cezheng]

Android NDK r12b's is generating linker error when luajit is present, with clang toolchain & c++_static STL.

The error is like this:

[armeabi-v7a] Gdbserver      : [arm-linux-androideabi] libs/armeabi-v7a/gdbserver
[armeabi-v7a] Gdbsetup       : libs/armeabi-v7a/gdb.setup
[armeabi-v7a] Compile++ thumb: hello-jni <= hello-jni.cpp
[armeabi-v7a] SharedLibrary  : libhello-jni.so
/path/to/android-ndk-r12b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: error: /path/to/android-ndk-r12b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/libgcc.a(pr-support.o): multiple definition of '_Unwind_GetRegionStart'
/path/to/android-ndk-r12b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: /path/to/android-ndk-r12b/sources/cxx-stl/llvm-libc++abi/../llvm-libc++/libs/armeabi-v7a/libunwind.a(Unwind-EHABI.o): previous definition here
/path/to/android-ndk-r12b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: error: /path/to/android-ndk-r12b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/libgcc.a(pr-support.o): multiple definition of '_Unwind_GetLanguageSpecificData'
/path/to/android-ndk-r12b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: /path/to/android-ndk-r12b/sources/cxx-stl/llvm-libc++abi/../llvm-libc++/libs/armeabi-v7a/libunwind.a(Unwind-EHABI.o): previous definition here
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [obj/local/armeabi-v7a/libhello-jni.so] Error 1

I have created a demo project to reproduce the problem: https://github.com/cezheng/luajit-failure-ndk-r12b. Detailed info about the demo is written in the README of the repo.

Just clone the project and run ndk-build.

Compiling with gcc 4.9 & gnustl_static seems to be fine.

[DanAlbert]

There's something temperamental about the link order here. I'm fairly certain I've fixed this in the platform build system before, so hopefully the same solution will work for the NDK.

[DanAlbert]

Tested with r13-beta1 and it works fine.

[DanAlbert]

(I was able to repro with r12b though. Not sure exactly what the fix was, but we did redo libc++ in r13.)

[cezheng]

Thanks, I'll have a try

[cezheng]

https://github.com/android-ndk/ndk/wiki

I read the r13 release schedule and it says that r13 will be released in Sep. Since beta2 didn't come out in August, I'm not sure if we have have a stable release of r13 this month. Since our project relies on clang & libc++, the newest stable release of NDK that can build our project is r10e.

However, r10e does not work correctly with precompiled header, and is taking too long to build. Using a beta release of NDK to build production code is somehow scary.

[DanAlbert]

Apologies for the delay. The QA team has been really busy with Android Studio and we haven't been able to get r13 beta 2 in for testing yet. I'm told it should be doable next week. Assuming we can get this out soon, r13 stable should still be doable for September, but it might be late September depending on the incoming bug rate for r13 beta 2.

I'll update the wiki.

[cezheng]

Thanks for sharing the progress. Cheers:beer:

[tavianator]

Did anyone ever figure out a workaround for this (other than updating to a beta NDK)?

[DanAlbert]

It's possible that c++_shared works. That may or may not be an acceptable work around for you.

[cezheng]

Use r10e or wait for r13 stable