[v8-users] Undefined reference Error in Android Embedded

[Jian Guo]

I tried to import v8 7.6.90 as a static library in my Android NDK project, 
but it fails at the link process. 

Here is my args.gn config for v8 build:
android_unstripped_runtime_outputs = true
v8_use_external_startup_data = false
is_debug = false
symbol_level = 1
target_cpu = "arm"
target_os = "android"
use_goma = false
v8_enable_i18n_support = false
v8_static_library = true
is_component_build = false
v8_monolithic = true
v8_android_log_stdout = true


It did compile and gave me a libv8_monolith.a after compiling, I started to 
set up my Android project then.

CMakeLists.txt:

cmake_minimum_required(VERSION 3.4.1)
add_library(v8 STATIC IMPORTED)
set_target_properties( v8 PROPERTIES IMPORTED_LOCATION 
${CMAKE_SOURCE_DIR}/libs/${ANDROID_ABI}/libv8_monolith.a)
add_library( # Sets the name of the library.
        native-lib

        # Sets the library as a shared library.
        SHARED

        # Provides a relative path to your source file(s).
        ${CMAKE_SOURCE_DIR}/src/main/cpp/native-lib.cpp)

target_include_directories( native-lib PRIVATE 
${CMAKE_SOURCE_DIR}/libs/include)

find_library( # Sets the name of the path variable.
        log-lib

        # Specifies the name of the NDK library that
        # you want CMake to locate.
        log)

target_link_libraries( # Specifies the target library.
        native-lib
        v8
        # Links the target library to the log library
        # included in the NDK.
        ${log-lib})


build.gradle:

externalNativeBuild {
    cmake {
        cppFlags "-std=c++0x"
    }
}
ndk {
    abiFilters "armeabi-v7a"
}


native-lib.cpp runs the same example in 
https://chromium.googlesource.com/v8/v8/+/master/samples/hello-world.cc

But ld always complains about the error:

error: undefined reference to 'v8::platform::NewDefaultPlatform(int, 
v8::platform::IdleTaskSupport, v8::platform::InProcessStackDumping, 
std::__ndk1::unique_ptr<v8::TracingController, 
std::__ndk1::default_delete<v8::TracingController> >)'

I tried to objdump my libv8_monolith.a:

objdump -D app/libs/armeabi-v7a/libv8_monolith.a | grep NewDefault
>


Disassembly of section 
.text._ZN2v88platform18NewDefaultPlatformEiNS0_15IdleTaskSupportENS0_21InProcessStackDumpingENSt3__110unique_ptrINS_17TracingControllerENS3_14default_deleteIS5_EEEE:
_ZN2v88platform18NewDefaultPlatformEiNS0_15IdleTaskSupportENS0_21InProcessStackDumpingENSt3__110unique_ptrINS_17TracingControllerENS3_14default_deleteIS5_EEEE:
       4:       81 b0 01 2b     blhs    #442884 
<_ZN2v88platform18NewDefaultPlatformEiNS0_15IdleTaskSupportENS0_21InProcessStackDumpingENSt3__110unique_ptrINS_17TracingControllerENS3_14default_deleteIS5_EEEE+0x6C210>
Disassembly of section 
.rel.text._ZN2v88platform18NewDefaultPlatformEiNS0_15IdleTaskSupportENS0_21InProcessStackDumpingENSt3__110unique_ptrINS_17TracingControllerENS3_14default_deleteIS5_EEEE:
.rel.text._ZN2v88platform18NewDefaultPlatformEiNS0_15IdleTaskSupportENS0_21InProcessStackDumpingENSt3__110unique_ptrINS_17TracingControllerENS3_14default_deleteIS5_EEEE:
Disassembly of section 
.ARM.exidx.text._ZN2v88platform18NewDefaultPlatformEiNS0_15IdleTaskSupportENS0_21InProcessStackDumpingENSt3__110unique_ptrINS_17TracingControllerENS3_14default_deleteIS5_EEEE:
.ARM.exidx.text._ZN2v88platform18NewDefaultPlatformEiNS0_15IdleTaskSupportENS0_21InProcessStackDumpingENSt3__110unique_ptrINS_17TracingControllerENS3_14default_deleteIS5_EEEE:
Disassembly of section 
.rel.ARM.exidx.text._ZN2v88platform18NewDefaultPlatformEiNS0_15IdleTaskSupportENS0_21InProcessStackDumpingENSt3__110unique_ptrINS_17TracingControllerENS3_14default_deleteIS5_EEEE:
.rel.ARM.exidx.text._ZN2v88platform18NewDefaultPlatformEiNS0_15IdleTaskSupportENS0_21InProcessStackDumpingENSt3__110unique_ptrINS_17TracingControllerENS3_14default_deleteIS5_EEEE:
Disassembly of section 
.text._ZN2v811ArrayBuffer9Allocator19NewDefaultAllocatorEv:
_ZN2v811ArrayBuffer9Allocator19NewDefaultAllocatorEv:
Disassembly of section 
.rel.text._ZN2v811ArrayBuffer9Allocator19NewDefaultAllocatorEv:
.rel.text._ZN2v811ArrayBuffer9Allocator19NewDefaultAllocatorEv:
Disassembly of section 
.ARM.exidx.text._ZN2v811ArrayBuffer9Allocator19NewDefaultAllocatorEv:
.ARM.exidx.text._ZN2v811ArrayBuffer9Allocator19NewDefaultAllocatorEv:
Disassembly of section 
.rel.ARM.exidx.text._ZN2v811ArrayBuffer9Allocator19NewDefaultAllocatorEv:
.rel.ARM.exidx.text._ZN2v811ArrayBuffer9Allocator19NewDefaultAllocatorEv:

_ZN2v88platform18NewDefaultPlatformEiNS0_15IdleTaskSupportENS0_21InProcessStackDumpingENSt3__110unique_ptrINS_17TracingControllerENS3_14default_deleteIS5_EEEE
>  


should be 

v8::platform::NewDefaultPlatform(int, v8::platform::IdleTaskSupport, 
v8::platform::InProcessStackDumping, 
std::__1::unique_ptr<v8::TracingController, 
std::__1::default_delete<v8::TracingController> >)
>
>
However, in the error message, the ld tries to find  
std::__ndk1::unique_ptr<v8::TracingController, 
std::__ndk1::default_delete<v8::TracingController> >)'

I think they have a different namespace, but how do I solve this problem? I 
found a similar issue here 
https://groups.google.com/forum/#!topic/v8-users/Jb1VSouy2Z0, but the 
solution didn't work for me.

Any ideas? Thanks for your help.

P.S:

NDK version in my Android Project: 19.1.53

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