Hi folks,

Libdecnumber has been already integrated into GDB, but there are still
some missing features that must be addressed for DFP types.

GDB's printf command currently does not support printing of DFP values
(Decimal32, Decimal64 and Decimal128). The following patch proposes to
fix that by allowing GDB's printf command to deal with those numbers.

Native DFP printing support with printf is not yet ready, but it should
be in some time eventually. Due to this, i'm testing for native printf
support for DFP in the configure script and setting a constant to
reflect the result (PRINTF_HAS_DECFLOAT). Based on that GDB has two ways
of dealing with the problem:

1 - If we have native support (and thus PRINTF_HAS_DECFLOAT is set), we
just send the DFP value straight to the standard printing routine with
its format specifiers (printf_filtered).

2 - If there's currently no support, we stick with converting the DFP
values to strings and using string format specifiers to print them. This
should make things flexible enough for both systems, one that has native
printf support for DFP and one that doesn't.

I'd appreciate comments on this one.

Regards,
Luis