v8 Android link error()

[Coulson Chen]

I build v8 static libraries for android successfully(using V8 6.5), and then embed it in andoid app(using the hello-world.cc demo from official wiki. Android studio 3.1,Cmake),but error  like the follow takes place while building the APK

Build command failed.

Error while executing process /usr/local/v8/v8/third_party/android_tools/sdk/cmake/3.6.4111459/bin/cmake with arguments {--build /mnt/share/V8Wrapper/app/.externalNativeBuild/cmake/debug/armeabi-v7a --target native-lib}

[1/2] Building CXX object CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o

[2/2] Linking CXX shared library ../../../../build/intermediates/cmake/debug/obj/armeabi-v7a/libnative-lib.so

FAILED: : && /usr/local/v8/v8/third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++  --target=armv7-none-linux-androideabi --gcc-toolchain=/usr/local/v8/v8/third_party/android_ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64 --sysroot=/usr/local/v8/v8/third_party/android_ndk/sysroot -fPIC -isystem /usr/local/v8/v8/third_party/android_ndk/sysroot/usr/include/arm-linux-androideabi -D__ANDROID_API__=16 -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -std=c++11 -std=c++11 -frtti -fexceptions -O0 -fno-limit-debug-info  -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a --sysroot /usr/local/v8/v8/third_party/android_ndk/platforms/android-16/arch-arm -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--fix-cortex-a8 -Wl,--exclude-libs,libunwind.a -L/usr/local/v8/v8/third_party/android_ndk/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libnative-lib.so -o ../../../../build/intermediates/cmake/debug/obj/armeabi-v7a/libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o  /usr/local/v8/v8/third_party/android_ndk/platforms/android-16/arch-arm/usr/lib/liblog.so -landroid ../../../../src/main/cpp/armeabi-v7a/libv8_base.a ../../../../src/main/cpp/armeabi-v7a/libv8_nosnapshot.a -latomic -lm "/usr/local/v8/v8/third_party/android_ndk/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a/libc++.a" && :

../../src/isolate.cc:0: error: undefined reference to 'vtable for v8::internal::SetupIsolateDelegate'

/usr/local/v8/v8/third_party/android_ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: the vtable symbol may be undefined because the class is missing its key function

clang++: error: linker command failed with exit code 1 (use -v to see invocation)

ninja: build stopped: subcommand failed.

the key point is " 'vtable for v8::internal::SetupIsolateDelegate'",is the libv8_base.a  not correct? 

Any help is appreciated!

[Manuel Rivera]

I

[young louis]

I have a similar problem when embeding V8  6.8 to android.  An error is reported while linking libv8_nosnapshot.a, briefly 

../../src/isolate.cc:0: error: undefined reference to 'vtable for v8::internal::SetupIsolateDelegate'

Can anyone help, please.

在 2018年4月13日星期五 UTC+8下午6:37:57，Coulson Chen写道：

[ibon]

I avoid linker problems by properly sorting the libraries.

The linker is sequential, and will fail if a given symbol is not present by the time it is referenced, regardless it is in another to link lib.

This is a sort order that worked for me.

 v8_base v8_libplatform v8_libbase v8_libsampler v8_snapshot v8_inspector

Other than that, I now make one single lib file will all v8 code in it. Not only to avoid linker errors, but to make my life easier by substantially reducing my mk file size.

hope this helps.

[Zac Hansen]

you can always just throw all the libs at the linker twice, too, if you're not sure the order..

[young louis]

Well, there is no linker problem if v8_snapshot is used. Linker problem for v8_nosnapshot only. 

As for the libs order, I  used a combined library created by the following commands bellow. Order had been adjusted. Not working.

ar -rcsD libv8_base.a ../v8_base/*.o
ar -rcsD libv8_base.a ../v8_libplatform/*.o
ar -rcsD libv8_base.a ../v8_libbase/*.o
ar -rcsD libv8_base.a ../v8_libsampler/*.o
ar -rcsD libv8_base.a ../src/inspector/inspector/*.o

Zac Hansen <xax...@gmail.com> 于2018年8月16日周四 上午2:09写道：

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[Hyper]

SetupIsolateDelegate is defined in v8’s setup-isolate.h file and has no dependencies. Have you tried including it ?

[Coulson Chen]

Yes, using  libv8_snapshot.a instead of  libv8_nosnapshot.a can work . I hava a another problem : building with v8 6.8 version can't generate snapshot library while 6.5 can generate, I using the same config and as the official wiki said, snapshot is built by default.

在 2018年8月17日星期五 UTC+8下午3:40:23，young louis写道：

[young louis]

For version 6.8, v8_snapshot should be built by default but it isn't . The following configure solves the problem. Give it a try. 

Edit file: " /out.gn/android.arm.release/args.gn"

'''

is_component_build = false

is_debug = false

symbol_level = 1

target_cpu = "arm"

target_os = "android"

use_goma = false

v8_android_log_stdout = true

v8_static_library = true

v8_use_external_startup_data = false

'''

Save and compile. 

在 2018年8月20日星期一 UTC+8下午2:51:46，Coulson Chen写道：