[v8-users] Undefined reference to v8::platform::NewDefaultPlatform

[Bogdan Padalko]

Hi! 

I'm trying to adapt changes from 
https://github.com/v8/v8/commit/ffee558e14e28fc8b1f9a3c10ea3615e0d686c7b to 
replace CreateDefaultPlatform with NewDefaultPlatform calls, however, for 
some reason I'm getting

/home/vagrant/php-v8/scripts/test_v8/hello_world.cpp:21: undefined 
reference to `v8::platform::NewDefaultPlatform(int, 
v8::platform::IdleTaskSupport, v8::platform::InProcessStackDumping, 
std::unique_ptr<v8::TracingController, 
std::default_delete<v8::TracingController> >)'

error with the following code:

#include <v8.h>
#include <libplatform/libplatform.h>

#include <stdlib.h>
#include <string.h>

using namespace v8;

void weak_callback(const v8::WeakCallbackInfo<v8::Persistent<v8::String>>& 
data) {
  printf("Weak callback called\n");
  data.GetParameter()->Reset();
}

int main(int argc, char* argv[]) {
  // Initialize V8.
  v8::V8::InitializeICU();
//  v8::Platform *platform = v8::platform::CreateDefaultPlatform();
//  v8::V8::InitializePlatform(platform);

  std::unique_ptr<v8::Platform> platform = v8::platform::NewDefaultPlatform
();
  v8::V8::InitializePlatform(platform.get());

  V8::Initialize();

  v8::Isolate::CreateParams create_params;
  create_params.array_buffer_allocator = v8::ArrayBuffer::Allocator::
NewDefaultAllocator();

  // Create a new Isolate and make it the current one.
  Isolate* isolate = v8::Isolate::New(create_params);

  v8::Persistent<v8::String> test;

  {
    Isolate::Scope isolate_scope(isolate);

    // Create a stack-allocated handle scope.
    HandleScope handle_scope(isolate);

    // Create a new context.
    Local<Context> context = Context::New(isolate);

    // Enter the context for compiling and running the hello world script.
    Context::Scope context_scope(context);


    test.Reset(isolate, String::NewFromUtf8(isolate, "Hello' + ', World!'"
));
    test.SetWeak(&test, weak_callback, v8::WeakCallbackType::kParameter);


    // Create a string containing the JavaScript source code.
    Local<String> source = String::NewFromUtf8(isolate, "(2+2*2) + ' ' + 
'Hello' + ', World!'");

    // Compile the source code.
    Local<Script> script = Script::Compile(source);

    // Run the script to get the result.
    Local<Value> result = script->Run();

    // Convert the result to an UTF8 string and print it.
    String::Utf8Value utf8(isolate, result);
    printf("%s\n", *utf8);
  }

  isolate->LowMemoryNotification();


  // Dispose the isolate and tear down V8.
  isolate->Dispose();
  V8::Dispose();
  V8::ShutdownPlatform();

  return 0;
}

build script:

#!/bin/bash

ROOT=/opt/libv8-6.5
LIB_DIR=$ROOT/lib/

SRC_DIR=$ROOT
INCLUDE_DIR=$ROOT/include

set -x

g++ -std=c++14 hello_world.cpp -o hello_world \
 -g \
 -O2 \
 -std=c++11 \
 -I$INCLUDE_DIR \
 -L$LIB_DIR \
 -Wl,-rpath,$LIB_DIR \
 -lv8_libbase \
 -lv8_libplatform \
 -lv8 \
 -lpthread

I use v8 build with the following params:

gn gen out.gn/x64.release --args="is_debug=false is_component_build=true 
v8_use_external_startup_data=false"
ninja -v d8 -C out.gn/x64.release

Host is x64 Ubuntu 16.04, libv8 installed from my pinepain/libv8-6.5 PPA 
(https://launchpad.net/~pinepain/+archive/ubuntu/libv8-6.5)

I'd really appreciate if anybody give it a look and provide some 
suggestions as after spending two days with this I think I just missing 
something very simple and obvious.

Regards,
Bogdan

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