[LLVMbugs] [Bug 13853] New: Null checks against weakly leaked symbols without __attribute__((weak_import)) should produce a warning

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13853

             Bug #: 13853
           Summary: Null checks against weakly leaked symbols without
                    __attribute__((weak_import)) should produce a warning
           Product: clang
           Version: trunk
          Platform: Macintosh
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Static Analyzer
        AssignedTo: kremenek at apple.com
        ReportedBy: doug at getitdownonpaper.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


If a framework is weakly leaked and code is doing a null check for the symbol,
but the symbol is not qualified with __attribute__((weak_import)) there should
be a warning that this check will be optimized out.

A framework being shipped without the correct qualifier can cause correct
client code to crash without the cause being immediately obvious.

Originally filed as http://llvm.org/bugs/show_bug.cgi?id=13852 and related to
http://www.openradar.me/12305923

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