[Bug libstdc++/105081] Make std::random_device throw std::system_error

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105081

--- Comment #5 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:d6a6a4ea086d6af97bd7fbd482f51df41c265b79

commit r14-2217-gd6a6a4ea086d6af97bd7fbd482f51df41c265b79
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Jun 30 14:37:59 2023 +0100

    libstdc++: Make std::random_device throw more std::system_error [PR105081]

    In r14-289-gf9412cedd6c0e7 I made the std::random_device constructor
    throw std::system_error for unrecognized tokens. But it still throws
    std::runtime_error for a token such as "rdseed" that is recognized but
    not supported at runtime by the CPU the program is running on.

    With this change we throw std::system_error for those cases too. This
    fixes the following failures on Intel CPUs withour rdseed support:

    FAIL: 26_numerics/random/random_device/94087.cc execution test
    FAIL: 26_numerics/random/random_device/cons/token.cc execution test
    FAIL: 26_numerics/random/random_device/entropy.cc execution test

    libstdc++-v3/ChangeLog:

            PR libstdc++/105081
            * src/c++11/random.cc (random_device::_M_init): Throw
            std::system_error when the requested device is a valid token but
            not available at runtime.