[Webkit-unassigned] [Bug 22456] New: Bison versions under 2.2 produce crashing CSSGrammar code for ARM

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=22456

           Summary: Bison versions under 2.2 produce crashing CSSGrammar
                    code for ARM
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: zuh at iki.fi


After agonizing bug hunting week, I found out that bison versions earlier than
2.2 produce faulty code that crashes on ARM CPUs from CSSGrammar.y. There's a
similar issue reported as bug 18538 but that's probably not exactly the same
thing as here.

git-bisecting pointed http://trac.webkit.org/changeset/35351 as the revision
that introduces the crashing.

As I have no mad bison skillz, determining if the actual cause is a bison bug
or something CSSGrammar.y could fix is a bit hard. But at the very least we
could add a check to configure.ac for this and error out.


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