[Webkit-unassigned] [Bug 97447] New: sizeof(CSSRule) compile assertion failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=97447

           Summary: sizeof(CSSRule) compile assertion failure
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows 7
            Status: UNCONFIRMED
          Severity: Blocker
          Priority: P1
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: net147 at gmail.com
                CC: hausmann at webkit.org


COMPILE_ASSERT(sizeof(CSSRule) == sizeof(SameSizeAsCSSRule), CSSRule_should_stay_small) fails when building with MinGW-w64 GCC 4.7.2. It previously compiled successfully with MinGW-w64 GCC 4.6.3.

The problem seems to be a change in the default behavior when padding bitfields. MinGW GCC 4.7.x uses -mms-bitfields by default while MinGW GCC 4.6.x doesn't. Since the underlying type is unsigned, it pads to 32-bit when it should really be padding to 8-bit.

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