@HardWater
I’ve looked and found a previous post mentioning this problem as well! Sprintf not working on develop. If you just want your app to run you can revert to a previous version of the branch (that’s what I’ve been doing so far, but I’m hoping they update to include sprintf in future versions). It appears they removed support for sprintf because of the amount of flash memory it requires to implement.
@AndyW
Thanks for chiming in! With the default app, it will “make” the file correctly, but since I am using sprintf in my app, “make < all your usual PLATFORM & APP arguments > clean” will cause sprintf errors because of the reasons mentioned above (or at least from what I know) 