ahatanak added a comment. This is limited to escaping blocks because disabling tail-call optimizations for all blocks might impact performance. The user is claiming that non-escaping blocks are often used in areas that are performance-sensitive (for example, dispatch_sync() and -[NSArray enumerateObjectsUsingBlock:] in a tight loop), so disabling tail-call optimization indiscriminately can cause performance degradation (and clients might decide not to use the command line option because of that).
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