Problem with loading native modules which built with --release

[katyo]

The neon build --release produces broken NodeJS native modules:

Error: Module did not self-register.
    at Object.Module._extensions..node (module.js:681:18)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
...

I understand, this is possibly a Cargo/Rust problem related to inapproppriate config.
Experimentally I found that it actual for all opt-level's > 0
But I don't know a proper solution.

[katyo]

Link to rust issue rust-lang/rust#54691

[katyo]

I found temporary workaround.

1. Add init function which calls __LOAD_NEON_MODULE itself:

#[no_mangle]
pub extern "C" fn node_addon_init() {
    __LOAD_NEON_MODULE();
}

register_module!(mut cx, {
  // your module code
}

The no_mangle directive is important.

2. Fix "install" script in package.json:

"scripts": {
    "install": "RUSTFLAGS='-C link-arg=-Wl,-init=node_addon_init' neon build --release",
  },

This solution uses ".init" section instead of ".ctors"/".init_array".
Of course, I tested this on linux only.

See https://github.com/katyo/ledb/tree/master/ledb-node

[kjvalencik]

This was fixed in #392.