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POARC and weak IBOutlet properties
 

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    <p>I just updated a project to make use of ARC with the Xcode 4.2 built-in conversion tool. Unfortunately there is a weird bug appearing that I don't understand and didn't find anything about. I have a document class with a property declaration:</p> <pre><code>@property (weak) IBOutlet WebView *webView; </code></pre> <p>In the implementation file I have a @synthesize statement:</p> <pre><code>@synthesize webView=_webView; </code></pre> <p>When I try to compile it, it fails and tells me:</p> <blockquote> <p>error: @synthesize of 'weak' property is only allowed in ARC or GC mode</p> </blockquote> <p>Of course the project is tagged to compile with ARC. I would highly appreciate any help to understand what I'm doing wrong and why.</p> <p>Edit: Was late yesterday. So here is a more complete compile-log:</p> <blockquote> <p>[...] -fobjc-arc -Wno-trigraphs -fpascal-strings -O0 -Wmissing-prototypes -Wreturn-type -Wparentheses -Wswitch -Wno-unused-parameter -Wunused-variable -Wunused-value -Wshorten-64-to-32 -DDEBUG=1 -isysroot /Developer/SDKs/MacOSX10.7.sdk -fasm-blocks -mmacosx-version-min=10.7 -gdwarf-2 -Wno-sign-conversion "-DIBOutlet=<strong>attribute</strong>((iboutlet))" "-DIBOutletCollection(ClassName)=<strong>attribute</strong>((iboutletcollection(ClassName)))" "-DIBAction=void)<strong>attribute</strong>((ibaction)" -iquote [...]/Build/Intermediates/[...].build/Debug/[...].build/[...]-generated-files.hmap -I[...]/Build/Intermediates/[...].build/Debug/[...].build/[...]-own-target-headers.hmap -I[...]/Build/Intermediates/[...].build/Debug/[...].build/[...]-all-target-headers.hmap -iquote [...]/Build/Intermediates/[...].build/Debug/[...].build/[...]-project-headers.hmap -I[...]/Build/Products/Debug/include -I[...]/Build/Intermediates/[...].build/Debug/[...].build/DerivedSources/x86_64 -I[...]/Build/Intermediates/[...].build/Debug/[...].build/DerivedSources -F[...]/Build/Products/Debug -fno-objc-arc [...]</p> </blockquote> <p>It seems the compiler-settings for ARC are turned on in the beginning and turned off again later in the arguments list. To be honest: I don't know where to remove such weird settings and how it came to this. The only solution I would come up with now, would be to start the complete project over from a blank and new one and import all the class files from scratch.</p> <p>If someone knows an easier way, I would appreciate very much.</p> <p>PS: I do have all build-settings concerning the ARC set to YES.</p>
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    1. COWhat happens when you remove the (weak)?
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    2. CODouble-check your build settings. Click on your project in the file navigator, select the "Build Settings" tab and search for "Automatic Reference Counting." Then, ensure the field for "Objective C++ Automatic Reference Counting" is set to Yes.
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    3. CO@Philibbo: If I remove the weak and replace it with an assign, everything compiles. Is it right, when I assume that this file seems to be excluded from the ARC somehow?
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