__attribute__((noescape)) doesn't seem to work in Objective-C
Originator: | lithium3141 | ||
Number: | rdar://19989922 | Date Originated: | 27-Feb-2015 02:08 PM |
Status: | Open | Resolved: | |
Product: | Developer Tools | Product Version: | Xcode 6.3 (6D532l) / OS X 10.10.2 (14C109) |
Classification: | Other Bug | Reproducible: | Always |
Summary: The Xcode 6.3 beta 2 release notes describe a new attribute "noescape," which specifies that a given block argument won't be captured and escape the receiving method. However, this attribute fails to produce a warning in pure Objective-C code when the method does in fact cause the given block to escape. Steps to Reproduce: 1. Open the attached sample project 2. Build it Expected Results: -invokeBlockLater: produces a warning because the given block, despite being declared with __attribute__((noescape)), is captured in both the lastLaterBlock and the laterBlocks properties. Actual Results: No warning is produced. Note: Sample project at https://github.com/lithium3141/NoescapeTest
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