Since turning off the legacy iOS compiler, I have been unable to build my app. All my native plugins have 64 bit plugin support included but when building, Flash Builder reports a warning, but fails on this warning.
I first reported this issue nearly a year ago but got no response, I'm trying again now.
Here's a video of exactly what happens: flashbuildererror - YouTube
Ok, I stripped out everything I could, then compiled and found I was having the same issue as found here:
Displaying the "Warning: using default implementation for GoogleGames" was what was causing the confusion.