[Bug libstdc++/77641] std::variant copy-initialization fails for type with non-trivial constexpr ctor

[timshen at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77641

--- Comment #4 from Tim Shen <timshen at gcc dot gnu.org> ---
Author: timshen
Date: Thu Sep 22 03:15:58 2016
New Revision: 240340

URL: https://gcc.gnu.org/viewcvs?rev=240340&root=gcc&view=rev
Log:
        PR libstdc++/77641
        * include/std/variant (_Variant_storage::_Variant_storage):
        Change _Variant_storage's union to be default constructible.
        * testsuite/20_util/variant/compile.cc: New test.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/std/variant
    trunk/libstdc++-v3/testsuite/20_util/variant/compile.cc