iPhone OS Deployment Target after update to iPhone SDK 4

I just updated to iPhone SDK 4 and am trying to debug on my device with 3.1.3 installed. Before the update, I compiled with Base and Active SDK set to 3.1.3 and all was well. After the update, I'm limited to SDKs 4.0 and 3.2--setting the base to 4.0 and iPhone OS Deploym开发者_JAVA技巧ent Target to iPhone OS 3.1.3, I'm able to build and install on my 3.1.3 device, but receive the following error:

Error from Debugger: mi_cmd_stack_list_frames: Not enough frames in stack

I'm not using anything specific to the newer SDK, as I haven't touched a bit of code, just updated the SDK/XCode. So what am I doing incorrectly? The application runs as expected on an iOS4-installed device. Are there changes to pre-existing API's that need to be weakly linked perhaps? Thanks for all help.

Have you tried removing the app completely from your dev device, doing a build -> clean all targets, and then build again to your device?

I found this answer on macforums. If it's correct, then you probably have a memory corruption problem in your app that is confusing the debugger. Perhaps over-releasing something somewhere.

This probably isn't related to the SDK you are compiling with. It's possible you had this problem in your app all along but it just didn't show up until things moved around with the new Xcode, SDK, etc.

EDIT - I just ran into this problem myself trying to update an older app of mine to 4.0. It would run fine in the simulator and would install and run on the device except it wouldn't run in the debugger on the device. Anyway, I finally decided it was the .xcodeproj file that was corrupt or bad in some way and created a new project, copied over my source files to the new project and now it all works again. It's a pain but it only took about 20 mins to duplicate all my settings and I spent a couple hours trying to get the debugger to work.

Myself (and probably many others) are concerned about "will I still be able to compile/install apps for v3.1.3 of the iPhone OS?"

And what version of xCode does it become IMPOSSIBLE to ever write v3.1.3 apps again? (Without installing a second copy of an older version of xCode.)

I've read the mile-long document that Apple wrote on the subject... but it sure would be simpler to understand if they just LISTED the various versions of each... instead of writing long paragraphs.

If you have:

• Mac OS version 10.x.x x
• xCode version x.x.x
• SDK version(s) x.x.x

you can produce apps for iPhone OS x.x.x through x.x.x?