https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64954
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
Known to fail| |4.9.3, 5.3.0, 6.0
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Although this is a corner case, it does look like rejecting is incorrect.
(Though EDG eccp 3.10 also rejects it.) Reconfirming with 6.0 and prior.
$ z.c && /home/msebor/build/gcc-trunk-svn/gcc/xg++
-B/home/msebor/build/gcc-trunk-svn/gcc -S -Wall -Wextra -Wpedantic ../z.c
struct A { };
int main() {
A a;
constexpr A b = a;
}
z.c: In function ‘int main()’:
z.c:4:21: error: the value of ‘a’ is not usable in a constant expression
constexpr A b = a;
^
z.c:3:7: note: ‘a’ was not declared ‘constexpr’
A a;
^
