There are zero QDebug operators that take an rvalue RHS, so there's no
need to make toString() perfectly forwarding. It just causes four¹
different versions of the identical function to be instantiated. Not
all compilers can merge the binary representations and those that try,
violate the standard (same address for different functions).
¹ {rvalue, lvalue} × {const, non-const}
Fix by taking by cref.
Amends 4097653215.
[ChangeLog][Potentially Source-Incompatible Changes][QtCore][QDebug]
The toString() static function no longer allows the called
operator<<() to modify the argument. No Qt-provided operator<<() does
that, and operators that do are probably buggy.
Change-Id: Iac1ee9d29f93fd4840b75ffe363d354a2d19a96e
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 13244eef6c913bb7f27cd8fbf459f5dfe9a0ed21)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
ae515c3f2e