App built with Xcode 4.2 ios 5.0 crashing when installed on iphone with ios 4.3.5

Question

I have an app that will not build anymore on ios 4.x

Last week it worked fine, and now I can confirm 2 people with older ios' are unable to launch the app on Test Flight.

1 person (ios 4.3.x) is unable to build the app anymore in Xcode and the debugger output is as follows

warning: Unable to read symbols from "dyld" (prefix __dyld_) (not yet
mapped into memory).
warning: Unable to read symbols for
/Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3
(8F190)/Symbols/System/Library/Frameworks/UIKit.framework/UIKit (file
not found).
warning: Unable to read symbols from "UIKit" (not yet mapped into memory).
warning: Unable to read symbols from "Foundation" (not yet mapped into memory).
warning: Unable to read symbols for
/Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3
(8F190)/Symbols/System/Library/Frameworks/CoreGraphics.framework/CoreGraphics
(file not found).
warning: Unable to read symbols from "CoreGraphics" (not yet mapped
into memory).
warning: Unable to read symbols from "libSystem.B.dylib" (not yet
mapped into memory).
warning: Unable to read symbols from "libgcc_s.1.dylib" (not yet
mapped into memory).

I am at a loss to figure this one out. I have been developing with the Latest SDK option and target set to 4.0.

The only change I made (that I can think of) was adding a breakpoint for all exceptions. I am removing that and seeing if that makes a difference, but won't get feedback for a while. I am asking here in case that is not the solution and to see if someone can ease my stress

EDIT The breakpoint had no effect. I didn't think it would affect running with test-flight, but I really hoped it would be the solution. I am leaving it up here, because it is how I get the debugger to stop before main.m in Xcode 4.2 and want others to be able to set the breakpoint if they didn't know how.

Answer 1

The solution,

I changed focus and tried to get the app to run on my old ipod touch 3.1

I found the solution here

Is it possible to target older iOS versions when using Xcode 4.2 and iOS 5 SDK?

by mmorris

I had to do what he clearly explained and 1 more thing:
Set the compiler in the Project and Target Build Set to LLVM GCC 4.2
That got the app running on my old ipod touch and my the iphones with 4.x.

Not sure how any of those settings could have changed from last week, but I am not going to think about that.