[Bug c/70378] wrong warning with -Wconversion with explicit cast

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70378

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|x86_64-w64-mingw32          |
             Status|UNCONFIRMED                 |NEW
            Version|unknown                     |6.0
           Keywords|                            |diagnostic
   Last reconfirmed|                            |2016-04-02
                 CC|                            |manu at gcc dot gnu.org
               Host|x86_64-w64-mingw32          |
     Ever confirmed|0                           |1
            Summary|[5.3] inconsistant warnings |wrong warning with
                   |with -Wconversion for       |-Wconversion with explicit
                   |different types             |cast
      Known to fail|                            |6.0
              Build|x86_64-w64-mingw32          |

--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Simpler testcase:

typedef unsigned int uint32_t;
void foo(char a, uint32_t b)
{
 b = (uint32_t)((b * 10) + (uint32_t)a); 
}

Something must be removing the explicit cast or messing up the expression.