[Bug build/21057] GDB build failure with flex 2.6.3

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

https://sourceware.org/bugzilla/show_bug.cgi?id=21057

Tom Tromey <tromey at sourceware dot org> changed:

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--- Comment #8 from Tom Tromey <tromey at sourceware dot org> ---
(In reply to Pedro Alves from comment #7)
> For GDB, switching to -p sounds like a viable option going forward.  Also,
> we probably need to switch to C++ mode, to avoid ODR violations around the
> parsers...  Need volunteers.  :-)

I tried yacc -p once, and it was trickier than it seemed like it ought
to have been.

C++ mode is a bison extension AFAIK.  I think using it would be very
nice, but I wonder whether it's acceptable.

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