[Bug c++/47729] Failure to receive warning message when comparing signed and unsigned integers

["ebotcazou at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47729

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |ebotcazou at gcc dot
                   |                            |gnu.org
         Resolution|                            |FIXED
           Severity|normal                      |major

--- Comment #1 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-02-14 10:12:24 UTC ---
> Unfortunately I don't receive warning message when comparing signed and
> unsigned integers within a function.
> 
> When comparing with >, >=, < or <=, it gives me a warning message.
> 
> Only when comparing with != inside a function does the warning message not
> appear.

This is rather confused.  You don't get the warning on line 19 because the
function template is instantiated with n/size equal to the constant 4u, so
there is no real need to warn here.

The relevant comment in the source code of the compiler is:

      /* Do not warn if the comparison is an equality operation, the
         unsigned quantity is an integral constant, and it would fit
         in the result if the result were signed.  */