[Bug exp/13206] support gcc's typeof

["tromey at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13206

Tom Tromey <tromey at redhat dot com> changed:

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                 CC|                            |tromey at redhat dot com

--- Comment #1 from Tom Tromey <tromey at redhat dot com> 2012-02-22 15:36:58 UTC ---
One wrinkle is that there's no way to tell if the source
was compiled with GNU extensions.  So, we can't simply parse
"typeof" as a token.  And, even the heuristic of looking up
a symbol named "typeof" may fail if different source files
were compiled with different options.

__typeof__ seems reasonably easy, though there is the question
of whether we'd want a new OP_TYPEOF.  If not, it simplifies
parsing, but you could have sizeof($x) != sizeof(typeof($x))
if $x changes between parsing and evaluation.

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