[LLVMbugs] [Bug 5879] New: warn on truncating enum to bool

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5879

           Summary: warn on truncating enum to bool
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Semantic Analyzer
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: daniel at zuster.org
                CC: llvmbugs at cs.uiuc.edu


MSVC has this, and its nice:
--
enum e0 { A = 1 };
bool f0() {
  bool a = A; // expected-warning {{ truncation from 'enum e0' to 'bool' }}
  return a && b && c;
}
--

It may require some tuning for specific enum values to avoid false positives.

The MSVC docs seem to indicate their warning is just part of a generic
truncation warning.
  http://msdn.microsoft.com/en-us/library/0as1ke3f(VS.80).aspx


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