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

[redi at gcc dot gnu.org via Gcc-bugs]

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

            Bug ID: 105081
           Summary: Make std::random_device throw std::system_error
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

Unsupported constructor tokens could throw a std::system_error with
std::invalid_argument instead of just std::runtime_error. That would match what
libc++ does.

This shouldn't break any existing code, because a handler for
std::runtime_error will still catch a std::system_error exception.