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PO"Symbol not found" Crash while Testing Mac OS X 10.7-specific code on 10.6
 

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  1. PO"Symbol not found" Crash while Testing Mac OS X 10.7-specific code on 10.6
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    <p>I have an application that uses a few classes found only in 10.7 Lion. (For example, NSFileCoordinator.)</p> <p>When my application launches, it can use NSFileCoordinator to coordinate read access to the data store. (I save to XML.)</p> <p>The application launches fine under 10.7 Lion, but when launching under 10.6 Snow Leopard, the application crashes with the error shown below.</p> <p>My base SDK is set to 10.7, and the deployment target is 10.6. As far as I can tell, all my code is properly wrapped, like:</p> <pre><code>if (NSClassFromString(@"NSFileCoordinator") != nil) { // Do something the 10.7 way } else { // Do something the 10.6 way } </code></pre> <p>But for some reason, I'm still seeing the crash. Since the Base SDK is 10.7, I can't run the application under Xcode in 10.6, making debugging difficult. Additional messages are being logged to the console:</p> <pre><code>9/1/11 9:48:03 AM [0x0-0x18018].com.me.myapp[173] dyld: Symbol not found: _OBJC_CLASS_$_NSFileCoordinator 9/1/11 9:48:03 AM [0x0-0x18018].com.me.myapp[173] Referenced from: /Volumes/Macintosh HD/Users/Me/Library/Developer/Xcode/DerivedData/Mac-ebdxgdvcqfnptlftkreamrwdxetd/Build/Products/Debug/myapp.app/Contents/MacOS/myapp 9/1/11 9:48:03 AM [0x0-0x18018].com.me.myapp[173] Expected in: /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation 9/1/11 9:48:03 AM [0x0-0x18018].com.me.myapp[173] in /Volumes/Macintosh HD/Users/Me/Library/Developer/Xcode/DerivedData/Mac-ebdxgdvcqfnptlftkreamrwdxetd/Build/Products/Debug/myapp.app/Contents/MacOS/myapp </code></pre> <p>And the crash report:</p> <pre><code>Process: myapp [137] Path: /Volumes/Macintosh HD/Users/Me/Library/Developer/Xcode/DerivedData/Mac-ebdxgdvcqfnptlftkreamrwdxetd/Build/Products/Debug/myapp.app/Contents/MacOS/myapp Identifier: com.me.myapp Version: 1.5.0 (150) Code Type: X86-64 (Native) Parent Process: launchd [92] Date/Time: 2011-09-01 09:40:32.591 -0400 OS Version: Mac OS X 10.6.8 (10K549) Report Version: 6 Interval Since Last Report: 2009 sec Crashes Since Last Report: 5 Per-App Crashes Since Last Report: 5 Anonymous UUID: 32784C79-0821-471E-BCBF-BE5874774075 Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000002, 0x0000000000000000 Crashed Thread: 0 Dyld Error Message: Symbol not found: _OBJC_CLASS_$_NSFileCoordinator Referenced from: /Volumes/Macintosh HD/Users/Me/Library/Developer/Xcode/DerivedData/Mac-ebdxgdvcqfnptlftkreamrwdxetd/Build/Products/Debug/myapp.app/Contents/MacOS/myapp Expected in: /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation in /Volumes/Macintosh HD/Users/Me/Library/Developer/Xcode/DerivedData/Mac-ebdxgdvcqfnptlftkreamrwdxetd/Build/Products/Debug/myapp.app/Contents/MacOS/myapp </code></pre>
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