Build a Node.JS C++ Module

Prerequisites

nvm

Build a Node.JS C++ Module from Scratch

nvm use 8

npm install -g node-gyp

mkdir addon

cd addon

npm init

touch binding.gyp

Edit binding.gyp and write this inside

{
"targets": [
{
"target_name": "addon",
"sources": [ "addon.cc" ]
}
]
}

touch addon.cc

Edit addon.cc and write this inside

#include <node.h>
#include <iostream>

using namespace v8;
using namespace std;

void HelloWorld(const FunctionCallbackInfo<Value>& args) {
   cout << "Hello, world!" << endl;
}

void Initialize(Local<Object> exports) {
   NODE_SET_METHOD(exports, "helloWorld", HelloWorld);
}

NODE_MODULE(addon, Initialize);

node-gyp configure build

Troubleshooting

Problem:

/usr/bin/ld: skipping incompatible /home/frank/kraken/vfcore/protobuf/arch/CentOS7-linux-i686/protobuf-2.4.1/stage/lib/libprotobuf.a when searching for -lprotobuf

Solution:

The library is 32-bit, but the node.js addon build is 64-bit.

You can check the architecture of your .a with :

objdump -f /home/frank/protobuf/arch/CentOS7-linux-i686/protobuf-2.4.1/stage/lib/libprotobuf.a | grep architecture

architecture: i386, flags 0x00000011:
architecture: i386, flags 0x00000010:
architecture: i386, flags 0x00000011:
architecture: i386, flags 0x00000011:
architecture: i386, flags 0x00000011:
(...)

So the solution is to change the include dir to
"-L/home/frank/protobuf/arch/CentOS7-linux-x86_64/protobuf-2.4.1/stage/lib",

Problem :

/usr/bin/ld: /home/frank/kraken/vfcore/protobuf/arch/CentOS7-linux-x86_64/protobuf-2.4.1/stage/lib/libprotobuf.a(common.o): relocation R_X86_64_32S against symbol `_ZTVN6google8protobuf7ClosureE' can not be used when making a shared object; recompile with -fPIC