[Bug c++/70057] duplicate integer overflow diagnostic in constant expressions

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70057

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-02-27
     Ever confirmed|0                           |1
      Known to fail|                            |5.3.0, 6.3.0, 7.0

--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed.  In GCC 6 and 7 the C++ front end issues not just one or two but
three diagnostics for the test case in comment #0:

$ cat t.C && gcc -S -Wall -Wextra -Wpedantic t.C
template <int N> struct S { };
S<(__INT_MAX__ + 1)> s;
t.C:2:16: warning: integer overflow in expression [-Woverflow]
 S<(__INT_MAX__ + 1)> s;
                ^
t.C:2:20: error: overflow in constant expression [-fpermissive]
 S<(__INT_MAX__ + 1)> s;
                    ^
t.C:2:20: error: overflow in constant expression [-fpermissive]
t.C:2:20: note: in template argument for type ‘int’