[llvm-bugs] [Bug 33575] New: Make Wmicrosoft-enum-value useful

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33575

            Bug ID: 33575
           Summary: Make Wmicrosoft-enum-value useful
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: llvm-bugs at lists.llvm.org

enums in MS mode are signed, but unsigned elsewhere. So if you have an enum
with the highest bit set, it will be negative in MS mode but positive
elsewhere.

Wmicrosoft-enum-value currently flags those, but having these enums is very
common in practice, and only a problem when they are compared to 0.

So we should move the warning to comparison time.

https://bugs.chromium.org/p/chromium/issues/detail?id=621097#c2 has half a
patch for that.

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