Re: warnings compiling Emacs 22 on amd64

[Eli Zaretskii]

> Date: Mon, 04 Dec 2006 11:48:15 +0100
> From: Francesco Potorti` <address@hidden>
> 
> I get these warnings during compilation on x86_64-unknown-linux-gnu with
> Debian testing with gcc (GCC) 4.1.2 20061028 (prerelease) (Debian 4.1.1-19)
> [...]
> gcc -c -D_BSD_SOURCE   -Demacs -DHAVE_CONFIG_H   -I. 
> -I/home/pot/gnu/emacs-22.0.91/src -D_BSD_SOURCE  -g -O2 -Wno-pointer-sign  
> editfns.c
> editfns.c: In function 'Fuser_uid':
> editfns.c:1317: warning: comparison is always false due to limited range of 
> data type
> editfns.c:1317: warning: comparison is always false due to limited range of 
> data type
> editfns.c: In function 'Fuser_real_uid':
> editfns.c:1325: warning: comparison is always false due to limited range of 
> data type
> editfns.c:1325: warning: comparison is always false due to limited range of 
> data type

These and other similar warnings seem all to come from the use of
MOST_POSITIVE_FIXNUM and MOST_NEGATIVE_FIXNUM.  Do these warnings go
away if you modify those two macros as below?

#define MOST_NEGATIVE_FIXNUM    - ((EMACS_INT) (1 << (VALBITS - 1)))
#define MOST_POSITIVE_FIXNUM    ((EMACS_INT) (1 << (VALBITS - 1) - 1))