[Bug testsuite/101866] libstdc++-v3/testsuite/experimental/random/randint.cc fails

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101866

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:93f1dbc7cdcc4b31ea4061efb4c2acf2d4f81eb8

commit r12-2866-g93f1dbc7cdcc4b31ea4061efb4c2acf2d4f81eb8
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Aug 11 22:11:19 2021 +0100

    libstdc++: Fix test that fails randomly [PR101866]

    This test assumes that the same sequence of three values cannot occur,
    which is incorect. It's unlikely, but not impossible.

    Perform the check in a loop, so that in the unlikely event of an
    identical sequence, we retry. If the library code is buggy it will keep
    producing the same sequence and the test will time out. If the code is
    working correctly then we will usually break out of the loop after one
    iteration, or very rarely after two or three.

    libstdc++-v3/ChangeLog:

            PR libstdc++/101866
            * testsuite/experimental/random/randint.cc: Loop and retry if
            reseed() produces the same sequence.