[Bug c++/61543] static_cast<void *>(static_cast<int>(enum_value)) doesn't get an error

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61543

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |accepts-invalid
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-05-12
                 CC|                            |msebor at gcc dot gnu.org
     Ever confirmed|0                           |1
      Known to fail|                            |4.8.3, 4.9.3, 5.3.0, 6.2.0,
                   |                            |7.1.0

--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed.  GCC seems to treat rvalues of integer types with zero value as the
literal 0.

$ cat t.C && gcc -S -Wall t.C

const int i = 0;

void *p0 = static_cast<void *>(i);
void *p1 = static_cast<void *>(static_cast<int>(i));   // accepted

enum { e = 0 };

void *q = static_cast<void *>(static_cast<int>(e));   // accepted

y.C:3:33: error: invalid static_cast from type ‘const int’ to type ‘void*’
 void *p0 = static_cast<void *>(i);
                                 ^