Should conditional compilation be used to cope with difference in CGFloat on different architectures?

Question

In answering this earlier question about getting a use of ceil() on a CGFloat to compile for all architectures, I suggested a solution along these lines:

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Answer 1

    var f : CGFloat = 0.5
    var result : CGFloat
    result = CGFloat(ceil(Double(f)))

Tell me what I'm missing, but that seems pretty simple to me.