Re: NetBSD 10.0_BETA w/gcc can't build NetBSD 10.0_BETA w/clang

[RVP <rvp%SDF.ORG@localhost>]

On Sat, 24 Jun 2023, John Klos wrote:

> I'm trying to build NetBSD 10.0_BETA with clang from NetBSD 10.0_BETA (Sat 
> Jun 24 02:46:39 UTC 2023) with gcc, and it fails here:
>
> --- pixman-fast-path.po ---
> /usr/xsrc/external/mit/pixman/dist/pixman/pixman-fast-path.c:2614:32: error: 
> shifting a negative signed value is undefined 
> [-Werror,-Wshift-negative-value]
>    while (buffer < end && x < pixman_fixed_minus_1)
>                               ^~~~~~~~~~~~~~~~~~~~
> /usr/xsrc/external/mit/pixman/dist/pixman/pixman.h:128:32: note: expanded 
> from macro 'pixman_fixed_minus_1'
> #define pixman_fixed_minus_1            (pixman_int_to_fixed(-1))
>                                         ^~~~~~~~~~~~~~~~~~~~~~~
> /usr/xsrc/external/mit/pixman/dist/pixman/pixman.h:130:56: note: expanded 
> from macro 'pixman_int_to_fixed'
> #define pixman_int_to_fixed(i)          ((pixman_fixed_t) ((i) << 16))
>                                                           ~~~  ^
> 1 error generated.

So, clang is whining over a logical _left_-shift, eh? Change that macro to
what's in the -HEAD sources:

```
#define pixman_int_to_fixed(i)          ((pixman_fixed_t) ((uint32_t) (i) << 16))
```

-RVP