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POSymbol not found: _objc_retainAutoreleasedReturnValue in MacOS command line tool
 

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    <p>There are a <em><a href="https://stackoverflow.com/questions/11551927/symbol-not-found-objc-retainautoreleasedreturnvalue-running-arc-compiled-code">couple</a> <a href="https://stackoverflow.com/questions/12735408/symbol-not-found-objc-retainautoreleasedreturnvalue">questions</a></em> with the same keywords as the title, however they focus on the iOS side of Objective-C. My problem is with a MacOS command line tool.</p> <p>Basically what's happening is that the Foundation (Cocoa) tool is calling a C function which ends up calling another Foundation method. And as the Foundation method is being called from the C function, that's where the "<code>Symbol not found: _objc_retainAutoreleasedReturnValue</code>" error is being thrown at run time. </p> <p>The code looks like this:</p> <p>log.h</p> <pre><code>@interface Log : NSObject { } @end void RemoveLogFile(NSString * theLogFile); </code></pre> <p>log.m</p> <pre><code>#import "Log.h" @implementation Log @end // this is a C-style function void RemoveLogFile(NSString * theLogFile) { NSString * logFileName; NSLog( @"about to allocate a filename" ); // crash can happen in either case below #if 1 logFileName = [NSString stringWithFormat: @"%@.log", theLogFile]; #else logFileName = [[NSString alloc] initWithFormat: @"%@.log", theLogFile]; #endif NSLog( @"done allocating"); } </code></pre> <p>main.m</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #import "Log.h" int main(int argc, const char * argv[]) { @autoreleasepool { NSString* outPath = [[NSString alloc] initWithFormat: @"%@/MyLogFile", @"/tmp/"]; NSLog( @"past out path alloc"); RemoveLogFile(outPath); NSLog( @"done with the test"); } return 0; } </code></pre> <p>ARC is turned on for the 64-bit compiled tool (<a href="https://stackoverflow.com/questions/7919227/arc-error-fobjc-arc-is-not-supported-with-fragile-abi">it can't be turned on for the 32-bit version</a>) and the minimum supported MacOS version is 10.6.</p> <p>When the tool is called in MacOS 10.7, it promptly crashes out with a log like this:</p> <pre><code>Process: com.dautermann.Doughnuts [540] Path: /Library/PrivilegedHelperTools/com.dautermann.Doughnuts Identifier: com.dautermann.Doughnuts Version: ??? (1.0) Code Type: X86-64 (Native) Parent Process: launchd [1] Date/Time: 2013-02-19 05:02:48.337 -0800 OS Version: Mac OS X 10.7 (11A390) Report Version: 8 Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000002, 0x0000000000000000 Application Specific Information: objc[540]: garbage collection is OFF Dyld Error Message: Symbol not found: _objc_retainAutoreleasedReturnValue Referenced from: /Library/PrivilegedHelperTools/com.dautermann.Doughnuts Expected in: /usr/lib/libobjc.A.dylib Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 dyld 0x00007fff5fc0106d dyld_fatal_error + 1 1 dyld 0x00007fff5fc04918 dyld::fastBindLazySymbol(ImageLoader**, unsigned long) + 128 2 libdyld.dylib 0x00007fff925f0716 dyld_stub_binder_ + 13 3 ??? 0x0000000100004030 0 + 4294983728 4 com.dautermann.Doughnuts 0x0000000100001523 0x100000000 + 5411 5 com.dautermann.Doughnuts 0x0000000100001470 0x100000000 + 5232 </code></pre> <p>My educated guess (with help from other folks) is that I may need to either pass in a "<code>char *</code>", or I have to declare something somewhere as "<code>_unsafe_unretained</code>". It sure seems like something that the modern Xcode 4.6 compiler should be handling for me. </p> <p>Anyone have any guesses as to what I might be doing wrong?</p>
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    1. USMichael Dautermann
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    1. COThese kinds of errors are caused by bad linking, or missing/corrupt libraries. Can you get to that dynamic library and run `nm` on it to see if that symbol exists. It exists in the text section (address 0x23055) of the binary on my system (OS X 10.7.5).
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      1. USborrrden
    2. CO`_objc_retainAutoreleasedReturnValue` is in the objc runtime, against which libraries is your tool linked?
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      1. USJTAS
 

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