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POiOS 4 app crashes at startup on iOS 3.1.3: Symbol not found: __NSConcreteStackBlock
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  1. POiOS 4 app crashes at startup on iOS 3.1.3: Symbol not found: __NSConcreteStackBlock
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    copied!<p>I'm running Xcode 3.2.3 with the iOS 4.0 SDK. I built my app with Base SDK = iphoneos4.0, Active SDK = iphoneos4.0, Deployment Target = 3.1.3, and Architecture = standard (arm6 arm7). Compiler = GCC 4.2. As I understand it, this is the correct way to <em>build</em> an app for both iOS 4 and 3.</p> <p>The app runs fine on devices running iOS 4. But it crashes on startup when you try to run it on a device with iOS 3.1.3 (an iPod Touch 1G):</p> <pre><code>dyld: Symbol not found: __NSConcreteStackBlock Referenced from: /var/mobile/Applications/192B30ED-16AC-431E-B0E9-67C1F41FD5DA/MyApp.app/MyApp Expected in: /usr/lib/libSystem.B.dylib </code></pre> <p>It appears to be an issue with a fairly "low level" dynamically-linked library, BEFORE my main() function even gets called. I have even tried re-starting the device, etc., with no luck. Here's part of the the crash log:</p> <pre><code>Process: MyApp [60] Path: /var/mobile/Applications/192B30ED-16AC-431E-B0E9-67C1F41FD5DA/MyApp.app/MyApp Identifier: MyApp Version: ??? (???) Code Type: ARM (Native) Parent Process: launchd [1] Date/Time: 2010-07-22 17:16:17.942 -0400 OS Version: iPhone OS 3.1.3 (7E18) Report Version: 104 Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x00000001, 0xe7ffdefe Crashed Thread: 0 Dyld Error Message: Symbol not found: __NSConcreteStackBlock Referenced from: /var/mobile/Applications/192B30ED-16AC-431E-B0E9-67C1F41FD5DA/MyApp.app/MyApp Expected in: /usr/lib/libSystem.B.dylib Dyld Version: 149 Binary Images: 0x1000 - 0x80fff +MyApp armv6 &lt;d5f0ff6f233b4b034c222c16438c88d9&gt; /var/mobile/Applications/192B30ED-16AC-431E-B0E9-67C1F41FD5DA/MyApp.app/MyApp 0x2fe00000 - 0x2fe26fff dyld armv6 &lt;544395a4b5546114b878d5131a84fd7f&gt; /usr/lib/dyld 0x30410000 - 0x30536fff libSystem.B.dylib armv6 &lt;0373fd64e915a17160732b29d343f95f&gt; /usr/lib/libSystem.B.dylib </code></pre> <p>Thanks for any advice!</p>
 

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