V8 compilation problems - macos

Question

I'm trying to compile a file with the V8 the JavaScript Engine by Google. I installed scons and have compiled the V8 engine. But, here is where the problem lies, I stay in the V8 directory as they say and make a file named hello_world.cpp with the code:
#include <v8.h>
using namespace v8;
int main(int argc, char* argv[]) {
// Create a stack-allocated handle scope.
HandleScope handle_scope;
// Create a new context.
Persistent<Context> context = Context::New();
// Enter the created context for compiling and
// running the hello world script.
Context::Scope context_scope(context);
// Create a string containing the JavaScript source code.
Handle<String> source = String::New("'Hello' + ', World!'");
// Compile the source code.
Handle<Script> script = Script::Compile(source);
// Run the script to get the result.
Handle<Value> result = script->Run();
// Dispose the persistent context.
context.Dispose();
// Convert the result to an ASCII string and print it.
String::AsciiValue ascii(result);
printf("%s\n", *ascii);
return 0;
}
Then I compile using gcc hello_world.cpp -o libv8.a. But, when I compile it I get a skew of errors:
hello_world.cpp:1:16: error: v8.h: No such file or directory
hello_world.cpp:3: error: ‘v8’ is not a namespace-name
hello_world.cpp:3: error: expected namespace-name before ‘;’ token
hello_world.cpp: In function ‘int main(int, char**)’:
hello_world.cpp:8: error: ‘HandleScope’ was not declared in this scope
hello_world.cpp:8: error: expected `;' before ‘handle_scope’
hello_world.cpp:11: error: ‘Persistent’ was not declared in this scope
hello_world.cpp:11: error: ‘Context’ was not declared in this scope
hello_world.cpp:11: error: ‘context’ was not declared in this scope
hello_world.cpp:11: error: ‘Context’ is not a class or namespace
hello_world.cpp:15: error: ‘Context’ is not a class or namespace
hello_world.cpp:15: error: expected `;' before ‘context_scope’
hello_world.cpp:18: error: ‘Handle’ was not declared in this scope
hello_world.cpp:18: error: ‘String’ was not declared in this scope
hello_world.cpp:18: error: ‘source’ was not declared in this scope
hello_world.cpp:18: error: ‘String’ is not a class or namespace
hello_world.cpp:21: error: ‘Script’ was not declared in this scope
hello_world.cpp:21: error: ‘script’ was not declared in this scope
hello_world.cpp:21: error: ‘Script’ is not a class or namespace
hello_world.cpp:24: error: ‘Value’ was not declared in this scope
hello_world.cpp:24: error: ‘result’ was not declared in this scope
hello_world.cpp:30: error: ‘String’ is not a class or namespace
hello_world.cpp:30: error: expected `;' before ‘ascii’
hello_world.cpp:31: error: ‘ascii’ was not declared in this scope
hello_world.cpp:31: error: ‘printf’ was not declared in this scope
I don't get why it say V8.h is not declared. I already built it and I'm in its directory and I'm guessing if I get rid of that all the other errors will go away. Any suggestions?

Answer 1

i just believe you in that you are really inside the toplevel source directory (and since i do not have compiled v8 i only believe that libvp8.a is created in that toplevel directory):
% g++ -Iinclude hello_world.cpp -o hello_world libv8.a
it says "v8.h" is not declared because that file is inside the "include" directory and the preprocessor is not able to find it out of thin air.
furthermore: you are compiling a .cpp file with the C compiler instead of the C++ compiler.
you are using the '-o' flag wrong because it defines the name of the linked binary and thus needs a name, you do not want the output binary be named "libvp8.a"