[LLVMbugs] [Bug 20102] New: Analyser gives a false positive because it assumes errno can give a zero result after a failing function call.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20102

            Bug ID: 20102
           Summary: Analyser gives a false positive because it assumes
                    errno can give a zero result after a failing function
                    call.
           Product: clang
           Version: 3.4
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: sstewartgallus00 at mylangara.bc.ca
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12694
  --> http://llvm.org/bugs/attachment.cgi?id=12694&action=edit
The source that gives the false positive

Attached is code that gives a false positive when compiled with "clang
--analyze -Xclang -analyzer-output=text -o- -std=c99 static-analyzer.c
-DNDEBUG".

Clang should be able to tell that right after a failing function call errno can
never be zero.

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