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POIPhone: Adding Category to CoreLocation threw link error. Why?
 

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    <p>I added a category to CLLocation in CoreLocation but kept getting a link error.<br> I search around and through process of TRY IT AND BE DAMNED I fixed the problem by adding -framework CoreLocation to Other Linker Flags<br> But dont know why?<br> I'm guessing its something to do with CoreLocation being and external framework. </p> <p>The Code: <strong>CLLocation+DistanceComparison.h</strong></p> <pre><code>#import &lt; Foundation/Foundation.h &gt; #import &lt; CoreLocation/CoreLocation.h &gt; static CLLocation * referenceLocation; @interface CLLocation (DistanceComparison) - (NSComparisonResult) compareToLocation:(CLLocation *)other; @end </code></pre> <p><strong>CLLocation+DistanceComparison.m</strong></p> <pre><code>#import "CLLocation+DistanceComparison.h" #import &lt;CoreLocation/CoreLocation.h&gt; @implementation CLLocation (DistanceComparison) - (NSComparisonResult) compareToLocation:(CLLocation *)other { CLLocationDistance thisDistance = [self getDistanceFrom:referenceLocation]; CLLocationDistance thatDistance = [other getDistanceFrom:referenceLocation]; if (thisDistance &lt; thatDistance) { return NSOrderedAscending; } if (thisDistance &gt; thatDistance) { return NSOrderedDescending; } return NSOrderedSame; } @end </code></pre> <p><strong>Build Error:</strong></p> <pre> Ld build/Debug-iphonesimulator/SortedLocations.app/SortedLocations normal i386 cd /Users/clearbrian/Documents/Development/IPhoneDevelopment/034.SortedLocations/SortedLocations setenv MACOSX_DEPLOYMENT_TARGET 10.5 setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk -L/Users/clearbrian/Documents/Development/IPhoneDevelopment/034.SortedLocations/SortedLocations/build/Debug-iphonesimulator -F/Users/clearbrian/Documents/Development/IPhoneDevelopment/034.SortedLocations/SortedLocations/build/Debug-iphonesimulator -filelist /Users/clearbrian/Documents/Development/IPhoneDevelopment/034.SortedLocations/SortedLocations/build/SortedLocations.build/Debug-iphonesimulator/SortedLocations.build/Objects-normal/i386/SortedLocations.LinkFileList -mmacosx-version-min=10.5 -framework Foundation -framework UIKit -framework CoreGraphics -o /Users/clearbrian/Documents/Development/IPhoneDevelopment/034.SortedLocations/SortedLocations/build/Debug-iphonesimulator/SortedLocations.app/SortedLocations Undefined symbols: ".objc_class_name_CLLocation", referenced from: literal-pointer@__OBJC@__cls_refs@CLLocation in RootViewController.o ld: symbol(s) not found collect2: ld returned 1 exit status </pre> <p>Getting link error when we added category<br> maybe because its external framework </p> <p>got help from<br> hg clone <a href="https://traillocation.googlecode.com/hg/" rel="nofollow noreferrer">https://traillocation.googlecode.com/hg/</a> traillocation<br> They added Foundation in Other Linker Flags for one of their targets<br> so I tried adding CoreLocation see attempt 2 </p> <p>ATTEMPT 1 : didnt work - see attempt 2 </p> <p>NOTE: to use this category on the 3.0 device, the -all_load linker flag<br> must be set in users of this library due to a toolkit bug.<br> See <a href="https://stackoverflow.com/questions/1147676/">Categories in static library for iPhone device 3.0</a> </p> <p>Right Click on project name in Groups and Files pane<br> Get Info<br> Build tab<br> type Other Linker Flags in search<br> when found<br> Double click in right column<br> add -all_load </p> <p>ATTEMPT 2 -<br> Right Click on project name in Groups and Files pane<br> Get Info<br> Build tab<br> type Other Linker Flags in search<br> when found<br> Double click in right column<br> add -framework CoreLocation<br> close<br> if you reopen the params are on two lines, this is ok<br> -framework<br> CoreLocation<br> Clean all targets<br> Build<br> seemed to work </p>
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