Thanks **mashingan** for showing how to work around the error message. I just wanted confirmation that the problem is on the compiler side or the libraries and not in my minimal code before opening an issue. The strange thing is that the errors does not always appear, as I've shown when you use a single file instead of 2 modules.
Like found by **MrZoraman** who opened that thread for the same compiler error, this bug is based on a small change in the code making it appear or not. It does not appear any more with the current compiler version for his code.
