[LLVMbugs] [Bug 18671] New: Detect dispatch_once_t in per-thread storage.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18671

            Bug ID: 18671
           Summary: Detect dispatch_once_t in per-thread storage.
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: iamleeg at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The contrived case at this gist (https://gist.github.com/iamleeg/8707968) uses
dispatch_once(), but because the dispatch_once_t token is in thread-local
storage the block will get executed multiple times. Perhaps the analyzer should
be able to report on this situation, because while I *might* want to do it, I
*probably* don't.

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