https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85437
Bug ID: 85437
Summary: [8 Regression] member pointer static upcast rejected
in a constexpr context
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
The following valid test case (extracted from bug 70248) is accepted by GCC 7
(and Clang and ICC) but rejected by GCC 8:
$ cat pr70248.C && gcc -S -Wall pr70248.C
struct A {};
struct B : A { int x; };
constexpr int A::*bx = static_cast<int(A::*)>(&B::x);
pr70248.C:4:24: error: a reinterpret_cast is not a constant expression
constexpr int A::*bx = static_cast<int(A::*)>(&B::x);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
