Bug#950608: gmp 6.2.0 crashes postgresql-pgmp (& others)

[Steven Robbins]

On Sunday, February 9, 2020 9:54:02 A.M. CST Marco Bodrato wrote:
> Ciao,
> 
>  From
> https://ci.debian.net/data/autopkgtest/testing/arm64/libm/libmath-gmp-perl/4
> 229384/log.gz I read the following:
> 
> #   Failed test 'Test worked: $x =
> Math::GMP->new("3878888047");Math::GMP::probab_prime($x,25);'
> #   at t/01_gmppm.t line 192.
> #          got: '2'
> #     expected: '1'
> 
> 
>  From the manual of GMP
> https://gmplib.org/manual/Number-Theoretic-Functions.html I read the
> following:
> 
> Function: int mpz_probab_prime_p (const mpz_t n, int reps)
>      Determine whether n is prime. Return 2 if n is definitely prime,
> return 1 if n is probably prime (without being certain), or return 0 if
> n is definitely non-prime.
> 
> So, if the new release of the library is able to answer that the number
> 3878888047 is prime, and not only "probably" prime... This should not be
> marked as a regression...

Indeed!  Thanks for investigating.  An improvement could be simply that all 
tests of this function (and any similar?) should be written to expect non-
zero, rather than superficially 1 or 2.

Is there a bug for libmath-gmp-perl for this test suite issue?

Best,
-Steve
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