[llvm-bugs] [Bug 28344] New: reinterpret_cast throws off static analyzer

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28344

            Bug ID: 28344
           Summary: reinterpret_cast throws off static analyzer
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: eric.huhtala at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

assignment via reinterpret_cast seems to throw off all analysis of that
variable.  

Example Code:

extern unsigned *b;
unsigned f() {

    // if I reassign b via reinterpret_cast, I get "Undefined or garbage value
returned to caller" at g(dummy)
    // if I don't, I get no warning
    unsigned *b = reinterpret_cast<unsigned*>(4);
    unsigned char a = (*b == 0) ? *b : 0;

    unsigned dummy;
    if (a == 0) dummy = 0;
    return dummy;
}

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