This is probably some kind of duplicate of crbug.com/648462.

If you look at that bug, there have been a bunch of patches landed for it to either suppress it for a third-party repo (like skia) or fix the places where it's being fired.

I think, at the very least, it should be safe to enable for third_party/WebKit. I think there's one place there that fires the warning but it's an easy fix.

I'll also take ownership of this :)

It seems the warning was removed from -Wmost in Clang, which means it's not enabled by default for us anymore:

New Revision: 287193

URL: http://llvm.org/viewvc/llvm-project?rev=287193&view=rev
Log:
Remove -Wsigned-enum-bitfield from -Wmost. On a wide set of ABIs, this warning
is completely irrelevant, producing (effectively) false positives, and -Wmost
is used pretty widely. We should somehow turn it back on by default when
targeting the MS ABI, however, since it indicates the program will not do as
intended in those cases.

(Or perhaps we should just treat enum bitfields as having the signedness of the
enum, even when targeting the MS ABI...)

Modified:
    cfe/trunk/include/clang/Basic/DiagnosticGroups.td
    cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td




I suppose that's better, as we can turn it on explicitly when our code is ready.

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