On 12/31/12 1:44 PM, Paul D. Fernhout wrote:
So, it was a meta-bug in that sense about an unexpected meaning shift
when a number leaked beyond a boundary that was supposed to contain it.
[..]
I'm not sure what sort of automated systems could deal with that kind
of unexpected semantic shift? Still, for that one case, probably one
could come up with a way of defining symbols that could not leak
across boundaries because of compiler checks or using public/private
typed aspects of languages to do that (like for example even in Java
where you had a public enum for error codes to return to user space,
but a different private enum for internal state). In practice the C
language the Linux kernel is written in may not make that easy to
enforce programmatically though.
Yup. Add more opaque types in the kernel implementation so that a type
conversion (to the POSIX semantics) _must_ occur. GCC recently
converted to compiling itself in stricter C++ mode, and the world did
not end. In spite of advice such as..
http://thread.gmane.org/gmane.comp.version-control.git/57643/focus=57918
Marcus
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