This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 112e. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
Should cv-qualified and cv-unqualified versions of fundamental types be considered to be layout-compatible types?
Rationale (August, 2011):
The purpose of “layout compatible” types in C++ is for C compatibility with respect to the common initial sequence of structs appearing in unions. However, C requires that corresponding members have compatible types, and compatible types must have the same cv-qualification. Consequently, this issue is not a defect.