Re: [PATCH] [Arm/gas] Fix broken build

[Richard Earnshaw <Richard.Earnshaw@foss.arm.com>]

On 25/05/2022 11:28, Luis Machado via Binutils wrote:
> Currently the build fails with:
> 
> binutils-gdb/gas/config/tc-arm.c: In function ‘s_arm_unwind_save_mixed’:
> binutils-gdb/gas/config/tc-arm.c:4730:17: error: comparison of integer expressions of different signedness: ‘unsigned int’ and
>   ‘long int’ [-Werror=sign-compare]
> ---
>   gas/config/tc-arm.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
> index 538d83f5462..9682db974ed 100644
> --- a/gas/config/tc-arm.c
> +++ b/gas/config/tc-arm.c
> @@ -4727,7 +4727,7 @@ s_arm_unwind_save_mixed (long range, long mask_range)
>     unsigned lim_hi = 0;
>   
>     /* Iterate over pseudoregister to establish subrange bounds.  */
> -  for (; lim_hi <= roof; lim_hi++)
> +  for (; lim_hi <= (unsigned) roof; lim_hi++)
>       {
>         if (mask_range & (1 << lim_hi))
>   	{

Why try to massage roof into a different type - it's defined in this 
function and there's no obvious reason (to me) why it has to be of type 
long.

So IMO, both lim_hi and roof should have the same type, then a cast 
would not be needed.

R.