Issue Running Sample In Mac Pro X86_64 Of V8 Engine?

Recently, I have a try to build and run sample hello world program of google v8. My xcode version is 4.0.2GA, x86_64.

The guide's link: get Started

But when run the command: g++ -Iinclude hello_world.cpp -o hello_world libv8.a -lpthread

The errors show:

ld: warning: ignoring file libv8.a, file was built for archive which is not the architecture being linked (x86_64)
Undefined symbols for architect开发者_运维百科ure x86_64:
"v8::Context::Enter()", referenced from:
      v8::Context::Scope::Scope(v8::Handle<v8::Context>)in ccJsmYlc.o
  "v8::V8::DisposeGlobal(v8::internal::Object**)", referenced from:
      v8::Persistent<v8::Context>::Dispose()      in ccJsmYlc.o
  "v8::Context::Exit()", referenced from:
      v8::Context::Scope::~Scope()in ccJsmYlc.o
  "v8::HandleScope::HandleScope()", referenced from:
      _main in ccJsmYlc.o
  "v8::Context::New(v8::ExtensionConfiguration*, v8::Handle<v8::ObjectTemplate>, v8::Handle<v8::Value>)", referenced from:
      _main in ccJsmYlc.o
  "v8::String::New(char const*, int)", referenced from:
      _main in ccJsmYlc.o
  "v8::Script::Compile(v8::Handle<v8::String>, v8::ScriptOrigin*, v8::ScriptData*, v8::Handle<v8::String>)", referenced from:
      _main in ccJsmYlc.o
  "v8::Script::Run()", referenced from:
      _main in ccJsmYlc.o
  "v8::String::AsciiValue::AsciiValue(v8::Handle<v8::Value>)", referenced from:
      _main in ccJsmYlc.o
  "v8::String::AsciiValue::~AsciiValue()", referenced from:
      _main in ccJsmYlc.o
  "v8::HandleScope::~HandleScope()", referenced from:
      _main in ccJsmYlc.o

ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status.

It should be obvious you are trying to link with a .a that was build for another architecture. Check out How do I determine the target architecture of static library (.a) on Mac OS X? to learn how to check the target architecture of that .a. Once you know that you can either retarget you project, or create a new libv8.a for the x86_64 architecture.