GMP upgrade to 4.2.4 leads to errors in PARI/GP

[Vincent Lefevre]

On 2009-03-09 03:12:02 +0100, Vincent Lefevre wrote:
> The input is "17." (the number 17 seen as a floating-point number).
> The output is 1.0E99, which is clearly wrong (it should have been 17).

In fact, rebuilding pari doesn't help:

prunille:~> gp
Reading GPRC: /Users/vinc17/.gprc ...Done.

                  GP/PARI CALCULATOR Version 2.3.4 (released)
          PowerPC running darwin (PPC/GMP-4.2.4 kernel) 32-bit version
       compiled: Mar  9 2009, gcc-4.0.1 (Apple Computer, Inc. build 5367)
                (readline v6.0 enabled, extended help available)

                     Copyright (C) 2000-2006 The PARI Group

PARI/GP is free software, covered by the GNU General Public License, and 
comes WITHOUT ANY WARRANTY WHATSOEVER.

Type ? for help, \q to quit.
Type ?12 for how to get moral (and possibly technical) support.

parisize = 4000000, primelimit = 500000
? 17.
%1 = 1.000000000000000002257486487 E72

instead of:

%1 = 17.000000000000000000000000000000000000

I've also sent a bug report to the PARI mailing-list.

-- 
Vincent Lefèvre <vincent at vinc17.org> - Web: <http://www.vinc17.org/>
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Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon)