[Bug libstdc++/83598] std::basic_regex C++14 conformance issue: resulting flags != passed flags

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83598

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Dec 27 22:18:02 2017
New Revision: 256013

URL: https://gcc.gnu.org/viewcvs?rev=256013&root=gcc&view=rev
Log:
PR libstdc++/83598 don't modify flags passed to std::basic_regex constructors

        PR libstdc++/83598
        * include/bits/regex.h (basic_regex): Don't modify flags passed to
        constructors.
        * testsuite/28_regex/basic_regex/ctors/83598.cc: New test.

Added:
    trunk/libstdc++-v3/testsuite/28_regex/basic_regex/ctors/83598.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/regex.h