Default warnings and useless extensions (e.g. arithmetic on void *)

[Vincent Lefevre]

On 2008-06-10 11:43:11 +0000, Joseph S. Myers wrote:
> For this particular extension, you can use the more specific warning 
> -Wpointer-arith.

I've added that to the default options for gcc in MPFR's configure.in.
I've seen it works with gcc 2.95.2 (which is AFAIK the latest gcc for
a non-reflashed Zaurus), so I don't think there should be any problem.
But there may be other missing useful warnings.

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Vincent Lefèvre <vincent@vinc17.org> - Web: <http://www.vinc17.org/>
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