Thank you, I'm not saying that nightlybuilds.ch is not safe, I was just asking.
I've edited the title to avoid misconceptions
The code that I'm compiling is the one from the visual studio project tutorial, the one that shows a tiny window with a green circle.
My av is Qihoo 360, and for me is one of the av with less false positives ratio.
But for sure, it can throw a false positive
Anyway, I will send a message to Qihoo to alert about this false positive, maybe they will fix it.