I've updated to Xcode 4.5 today and I can't produce a functional release build of my app any longer. I had no trouble producing a release with the previous version of Xcode.

I noticed that it doesn't crash when I run it directly on my phone in debug (-O0), but when I produce a release (-Os) it crashes consistently a few seconds after startup.

I can also produce a working release if I set pjsua_app.c to -O0 while leaving the rest of the project at the release default of -Os.

Below is a crash log using the setting "Fast [-O, O1]":

Incident Identifier: DB1C14AD-5C2A-4F2C-8B03-E483A7D31760
CrashReporter Key:   435140979595045aaa5a1c90fee1a20f6faf280a
Hardware Model:      iPhone4,1
Process:         myAppName [14144]
Path:            /var/mobile/Applications/CD2A07F5-3E72-444D-9BD9-910E4634C4EC/myAppName.app/myAppName
Identifier:      myAppName
Version:         ??? (???)
Code Type:       ARM (Native)
Parent Process:  launchd [1]

Date/Time:       2012-09-19 23:41:39.098 -0600
OS Version:      iPhone OS 5.1.1 (9B206)
Report Version:  104

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x00000000, 0x00000000
Crashed Thread:  0

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libsystem_kernel.dylib          0x361f532c __pthread_kill + 8
1   libsystem_c.dylib               0x32d41208 pthread_kill + 48
2   libsystem_c.dylib               0x32d3a316 __abort + 86
3   libsystem_c.dylib               0x32d2c3c4 __stack_chk_fail + 164
4   myAppName                       0x000ce0dc pjsip_init (pjsua_app.c:4391)
5   myAppName                       0x0008e9d2 general_callsystem_init (general_call.m:149)
6   myAppName                       0x00084b4c -[MainsipphoneAppDelegate initPjsip] (MainsipphoneAppDelegate.m:578)
7   myAppName                       0x0009f3ec -[LoginViewController ProvisionServerGotResult:provision_array:] (LoginViewController.m:1530)
8   myAppName                       0x000ab88e -[Pro
iphone compiler-optimization crash-reports pjsip xcode4.5
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