GCC 3.3.1, new warnings with <limits>

[David Leimbach]

Heh that's because the offending macro __glibcpp_digits calls 
__glibcpp_signed (T)
on an unsigned type which does a < compareison.

std::numeric_limits <signed long>::digits on a 32bit FBSD will yield 31 
because its
got 31 bits for magnitude.

Unfortunately the way it seems to go about calculating that stuff at 
compile time
seems to be invalid due to the fact that it does < 0 compares on 
unsigned types.

Is this a gcc issue or a FBSD issue? [is this the original gcc c++ 
header file or has
it been tweaked?]

Dave

On Saturday, July 12, 2003, at 10:53AM, Craig Rodrigues wrote:

> Hi,
>
> If I compile the following program:
>
> #include <iostream>
> int main(int argc, char *argv[] { return 0; }
>
> with the following flags:
>
> g++ -W -Wall b.cc
>
>
> I get lots of warnings that did not appear in GCC 3.2:
>
> In file included from /usr/include/c++/3.3/bits/locale_facets.tcc:43,
>                  from /usr/include/c++/3.3/locale:47,
>                  from /usr/include/c++/3.3/bits/ostream.tcc:37,
>                  from /usr/include/c++/3.3/ostream:535,
>                  from /usr/include/c++/3.3/iostream:45,
>                  from b.cc:1:
> /usr/include/c++/3.3/limits:630: warning: comparison of unsigned 
> expression < 0
>    is always false
> /usr/include/c++/3.3/limits:631: warning: comparison of unsigned 
> expression < 0
>    is always false
> /usr/include/c++/3.3/limits:730: warning: comparison of unsigned 
> expression < 0
>    is always false
> /usr/include/c++/3.3/limits:731: warning: comparison of unsigned 
> expression < 0
>    is always false
> /usr/include/c++/3.3/limits:830: warning: comparison of unsigned 
> expression < 0
>    is always false
> /usr/include/c++/3.3/limits:831: warning: comparison of unsigned 
> expression < 0
>    is always false
>
>
>
>
> Is there a way to fix the <limits> header file?
> -- 
> Craig Rodrigues
> http://crodrigues.org
> rodrigc at crodrigues.org
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