Not sure what the problem is but it seems to be related to the Linker.
In the online editor, I click on "Verify and Save" on a Macbook (10.13 + Chrome) and get the following errors. Note the reference to a ubuntu folder. I have compiled this project on another Macbook which runs Ubuntu 18.04 + Chrome.
Does the online arduino editor use a local tool chain, or does it use a tool chain that is on the network (@ AWS?).
I recommend subscribing to those threads so that you'll be sure to get news of any progress in fixing it.
This is an Arduino Web Editor specific problem so the workaround is to use the regular Arduino IDE, which you can download for free from: http://www.arduino.cc/en/Main/Software
mhayes:
Does the online arduino editor use a local tool chain, or does it use a tool chain that is on the network (@ AWS?).
On the network. The only thing running on your computer is what's needed for uploading.
Although there is a formal bug tracking system for the standard Arduino IDE and all of its components, the powers that be decided that for the Arduino Web Editor and the rest of the Arduino Create project, the Arduino forum should serve as the bug tracker. So all these duplicate forum threads are the official bug reports. It would be time consuming for the developers to provide updates on all 18 (and counting) threads, though they will likely try to comment on most of them once the bug is fixed. So, as I said, if you want to be sure to get notified of the progress then you'll need to subscribe to all of them.