off-by-one bug in warning system

[Alexandre Oliva]

On Aug 14, 2000, Chris Uzdavinis <chris@atdesk.com> wrote:

> The g++ (C++) compiler 2.96 20000722 (experimental) as well as 2.95.2
> have an off-by-one bug in the warning generation for the most negative
> long long value.

No.  There's no such thing as a negative literal.  

>   typedef long long LONG64;
>   const LONG64 LONG64_MIN = -9223372036854775808LL;

`-...8LL' must be parsed as two separate tokens, according to the C
and C++ Standards: a unary minus and an integer literal that is too
large to fit in a `long long'.  Thus the warning.

>   const LONG64 LONG64_MIN = -9223372036854775807LL - 1;

> ... and the warning went away.  (But I shouldn't have to do that, I
> think.) 

Yes, you should.

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
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