After searching through the codebase, I found something interesting.
In thrid_party/android_ndk/cxx-stl/llvm-libc++/include/__config:
#define _LIBCPP_NAMESPACE _LIBCPP_CONCAT(__ndk,_LIBCPP_ABI_VERSION)
#define _LIBCPP_BEGIN_NAMESPACE_STD namespace std {inline namespace
_LIBCPP_NAMESPACE {
#define _LIBCPP_END_NAMESPACE_STD } }
#define _VSTD std::_LIBCPP_NAMESPACE
namespace std {
inline namespace _LIBCPP_NAMESPACE {
}
}
But in buildtools/third_party/libc++/trunk/include/__config:
#ifndef _LIBCPP_ABI_NAMESPACE
# define _LIBCPP_ABI_NAMESPACE _LIBCPP_CONCAT(__,_LIBCPP_ABI_VERSION)
#endif
#define _LIBCPP_BEGIN_NAMESPACE_STD namespace std { inline namespace
_LIBCPP_ABI_NAMESPACE {
#define _LIBCPP_END_NAMESPACE_STD } }
#define _VSTD std::_LIBCPP_ABI_NAMESPACE
_LIBCPP_BEGIN_NAMESPACE_STD _LIBCPP_END_NAMESPACE_STD
I think they are different from each other, as the first one should be
"std::__ndk1", and the second one should be "std::__1".
On Saturday, May 25, 2019 at 11:37:37 PM UTC+8, Jian Guo wrote:
>
> 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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