Memory Allocation Between iPhone 2G and 3G

Question

In one of my builds for an iPhone app, I had inadvertently created a variable that shadowed a variable in the scope above it. This was unintentional, but compiled since Objective-C apparently allows shadowing of variables between an if block and its containing method.

When I sent out this code, people that were using iPhone 3Gs immediately encountered problems, but people using 2Gs didn't have any apparent problems.

Does anyone happen to know if there are actual OS differences for these two models? Do 2Gs have compile-time, static memory allocation, somehow?

This was a huge point of confusion, since I only had a 2G development device, and never encountered a problem, even though theoretically, the code should not have worked as expected.

Now, there are a couple of other differences in that the 3Gs were using builds targetting an AdHoc build, while the ones the 2Gs were using were targetted for Release.

Answer 1

There shouldn't be any differences, they use the same processors and I believe the same RAM. They are practically the same platform. The OS is literally the same - if you force it, an iPhone 3G IPSW can be restored to a 2G (and vice versa) and it will work perfectly (note if you unzip the IPSW and look inside an iPhone build it contains NOR files for both platforms).

It could be coincidence, in that your users could have had different versions of the OS, or it could be a difference between your ad hoc build and your release.