neon: [docs] Electron apps - undefined symbol __cxa_pure_virtual

Hey, I’m learning how to set up neon here, and I’m running into an issue where, upon launching electron, I get the error: undefined symbol: __cxa_pure_virtual.

FWIW, I followed the documentation here. I found #194, but I’ve interpreted it as the ticket for integrating with electron-rebuild, and that the electron-build-env process was already functional? 🤔 😄

To reproduce:

git clone https://github.com/electron/electron-quick-start
cd electron-quick-start
npm i neon-hello
npm i electron-build-env neon-cli --save-dev
$(npm bin)/neon build neon-hello
Edit main.js, adding require('neon-hello') to the top
npm start

$ npm start                                         

> electron-quick-start@1.0.0 start /home/mitch/dev/electron-quick-start
> electron .

App threw an error during load
Error: /home/mitch/dev/electron-quick-start/node_modules/neon-hello/native/index.node: undefined symbol: __cxa_pure_virtual
    at process.module.(anonymous function) [as dlopen] (ELECTRON_ASAR.js:160:31)
    at Object.Module._extensions..node (internal/modules/cjs/loader.js:722:18)
    at Object.module.(anonymous function) [as .node] (ELECTRON_ASAR.js:160:31)
    at Module.load (internal/modules/cjs/loader.js:602:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:541:12)
    at Function.Module._load (internal/modules/cjs/loader.js:533:3)
    at Module.require (internal/modules/cjs/loader.js:640:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at Object.<anonymous> (/home/mitch/dev/electron-quick-start/node_modules/neon-hello/lib/index.js:1:168)
    at Object.<anonymous> (/home/mitch/dev/electron-quick-start/node_modules/neon-hello/lib/index.js:5:3)
A JavaScript error occurred in the main process
Uncaught Exception:
Error: /home/mitch/dev/electron-quick-start/node_modules/neon-hello/native/index.node: undefined symbol: __cxa_pure_virtual
    at process.module.(anonymous function) [as dlopen] (ELECTRON_ASAR.js:160:31)
    at Object.Module._extensions..node (internal/modules/cjs/loader.js:722:18)
    at Object.module.(anonymous function) [as .node] (ELECTRON_ASAR.js:160:31)
    at Module.load (internal/modules/cjs/loader.js:602:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:541:12)
    at Function.Module._load (internal/modules/cjs/loader.js:533:3)
    at Module.require (internal/modules/cjs/loader.js:640:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at Object.<anonymous> (/home/mitch/dev/electron-quick-start/node_modules/neon-hello/lib/index.js:1:168)
    at Object.<anonymous> (/home/mitch/dev/electron-quick-start/node_modules/neon-hello/lib/index.js:5:3)

About this issue

Original URL
State: closed
Created 5 years ago
Comments: 20 (10 by maintainers)

Commits related to this issue

seshat-node: Don't declare __cxa_pure_virtual anymore. This was needed because of a upstream issue of neon. The issue has since been fixed so no need for it anymore. Upstream issue: https://github.c... — committed to matrix-org/seshat by poljar 4 years ago

Most upvoted comments

If someone is interested, I solved the issue by doing what someone did in this post : https://users.rust-lang.org/t/neon-electron-undefined-symbol-cxa-pure-virtual/21223

#[no_mangle]
pub extern fn __cxa_pure_virtual() {
    loop{};
}

I added this piece of code in my native/src/lib.rs file, rebuilt the project, and it worked for me.

MeryllEssig on Mar 30, 2019

Re-opening this issue. It is not a duplicate. It’s caused by a missing .cpp(true) when building neon-runtime. It should be fixed in an upcoming PR to resolve several electron issues.

kjvalencik on Sep 8, 2019

@fominok Happened to me when I didn’t build with electron-build-env - doing so resolves it for me (in combination with the workaround from @MeryllEssig).

stoically on May 14, 2019

theJian on Mar 23, 2019

@mitchhentges electron comes with a chromium to render the content, no worries. I don’t have the time to test the issue currently (currently moving into a new flat) if i find some time at work i will try it though.

Hammster on Feb 11, 2019

@adityapk00 That’s likely an issue in the examples repo (for example, it’s using an older cli version). Can you open an issue there? Thanks!

kjvalencik on Dec 30, 2019

@kjvalencik thank you for the fast reply I’ve tried to build this example and have failed with ‘lib/cli.js’ not found error on npm i and different node versions error. I’m new to Node and build steps for this example would be very helpful for me Had to replace node ../lib/cli.js to neon and everything goes fine, thanks!

fominok on Nov 1, 2019

Yes, it should be fixed. There is an electron test that can be used as an example. The rust neon crate needed to be bumped as well.

https://github.com/neon-bindings/neon/tree/master/test/electron

kjvalencik on Oct 30, 2019

Well I’ve tried solution with defining missing fn as suggested by @MeryllEssig but now it has undefined symbols like _ZN12v88Function3… and so on

fominok on May 11, 2019

@mitchhentges the versions for the current electron-quickstart should be the follwing, since you use node 11.9.0 could you try to use node 10.11.0 when building instead.


Electron	4.0.4
Node	10.11.0
Chromium	69.0.3497.106

Hammster on Feb 7, 2019

Does the example work for you?

amilajack on Feb 4, 2019