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    <p>As replied in this question : <a href="https://stackoverflow.com/questions/6394989/objective-c-xcode-4-0-2-subclass-cant-access-superclass-variables-was-not-decl/6958905#6958905">objective c xcode 4.0.2: subclass can&#39;t access superclass variables &quot;was not declared in this scope&quot;</a></p> <p>From the doc : Apple Objective-C Programming Langage : <a href="http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/ObjectiveC/Chapters/ocDefiningClasses.html#//apple_ref/doc/uid/TP30001163-CH12-TPXREF125" rel="nofollow noreferrer">http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/ObjectiveC/Chapters/ocDefiningClasses.html#//apple_ref/doc/uid/TP30001163-CH12-TPXREF125</a></p> <blockquote> <p>The instance variable is accessible within the class that declares it and within classes that inherit it. All instance variables without an explicit scope directive have @protected scope.</p> <p>However, a public instance variable can be accessed anywhere as if it were a field in a C structure. For example:</p> <p>Worker *ceo = [[Worker alloc] init];</p> <p>ceo->boss = nil;</p> </blockquote> <p>I have the compilation error using LLVM GCC 4.2 (for an iOS project, on device) : </p> <blockquote> <p>error: 'fooInstanceVar' undeclared (first use in this function) and the same one using GCC 4.2 : error: 'fooInstanceVar' undeclared (first use in this function)</p> </blockquote> <p>I can compile using LLVM Compiler 2.0 whithout error.</p> <p>For compiling with LLVM GCC 4.2 and GCC 4.2 with the use of self-> :</p> <blockquote> <p>[NSArray arrayWithObjects:self.barProperty, self->fooInstanceVar, nil]; in the doSomethingWithProperty method.</p> </blockquote>
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    1. POIf a subclass refers to a superclass ivar, synthesizing an unrelated property fails
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    1. COYour SO link is broken. Other than that, it sounds like your answer is essentially an affirmation that you've experienced the problem I describe in my question too. That's heartening, sort of, but do you know why it happens? That's what I'm really after.
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    2. COFound an interesting issue : when compiling for iPhone, got the error, but no error when compiling for the simulator
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    3. COOptions for iphone : `llvm-gcc-4.2 -x objective-c -arch armv6 -fmessage-length=0 -pipe -std=gnu99 -Wno-trigraphs -fpascal-strings -O0 -Wreturn-type -Wunused-variable -Wshorten-64-to-32 -DDEBUG -isysroot iPhoneOS4.3.sdk -gdwarf-2 -mno-thumb -miphoneos-version-min=4.3 -iquote`
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