[LLVMbugs] [Bug 16119] New: Add a warning for incomplete bitfields

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16119

            Bug ID: 16119
           Summary: Add a warning for incomplete bitfields
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: gjasny at googlemail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Hello,

it would be great if clang could issue a warning when it detects structs with
incomplete bitfields. For example:

struct msg
{
    uint8_t parameterA:1;
    uint8_t reserved:1; // must be zero
};

Here the intention is to always set reserved to zero to be able to add some
more parameters later. But reserved only covers one from the remaining 7 bits.

Maybe clang could warn about incompletely filled bitfields?

Thanks,
Gregor

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