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    <p>First, the simple answer: <strong>use <code>-release</code> instead</strong>. I believe <code>-drain</code> was added in 10.4 as an alias for <code>-release</code>, and in 10.5 it gained GC-specific behavior of its own. This allows code to use it in 10.5 and still work under 10.4. GNUstep probably doesn't yet have the new functionality.</p> <hr> <p>Obviously you're trying out some boilerplate Objective-C code on Ubuntu, but it causes me to wonder what you're hoping to accomplish in the long term. Don't let me deter you if it's just out of curiosity or for the challenge of it. However, if you're planning to use GNUstep to develop Objective-C for serious programming, I would advise against it, for several reasons.</p> <ol> <li>Objective-C is an interesting programming language with a number of powerful features, but not significantly more so (by itself) than other object-oriented languages. Objective-C really becomes compelling when you pair it with the cool features in Cocoa and other related frameworks. Apple (primarily) drives those frameworks, and only for Mac/iPhone.</li> <li>Apple generally has the best tools and user experience for Objective-C development. They're also investing heavily in development of <a href="http://llvm.org/" rel="nofollow noreferrer">LLVM</a> and <a href="http://clang.llvm.org/" rel="nofollow noreferrer">Clang</a> as a replacement for gcc. This will (an already does) make possible some very cool things that gcc wasn't designed for.</li> <li>GNUstep is an admirable project, but since it depends on volunteers and reverse-engineering new features added by Apple, it always lags behind the state-of-the-art. The new shiny Objective-C features will always start with Apple and (usually) eventually trickle down.</li> <li>Building cross-platform apps <em>could</em> be done in Objective-C, but other languages are much better suited for the task. (I'm not so much of a fanboy as to suggest that Objective-C is the best solution for every problem. Use the best tool you have at hand.)</li> </ol> <p>I'm not saying using languages on something other than their "native platform" is bad. I'm just suggesting that if that's what you're going to do, you should be aware of the potential problems and be sure you're convinced that the pros outweigh the cons.</p>
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