Re: [PATCH] rust: build correctly without GNU sed

[Patrick Steinhardt <ps@pks.im>]

On Thu, Dec 18, 2025 at 06:25:44PM -0500, D. Ben Knoble wrote:
> From e509b5b8be (rust: support for Windows, 2025-10-15), we check
> cargo's information to decide which library to build. However, that
> check mistakenly used "sed -s" ("consider files as separate rather than
> as a single, continuous long stream"), which is a GNU extension. The
> build thus fails on macOS with "meson -Drust=enabled", which comes with
> BSD-derived sed.
> 
> Instead, use the intended "sed -n" and print the matching section of the
> output. This failure mode likely went unnoticed on systems with GNU sed
> (common for developer machines and CI) because, in those instances, the
> output being matched by case is the full cargo output (which either
> contains the string "-windows-" or doesn't).

Yeah, I guess that's what happened indeed. I seem to have confused "-s"
for "--silent" with "-n" when I wrote this.

> Helped-by: Eric Sunshine <sunshine@sunshineco.com>
> Helped-by: Patrick Steinhardt <ps@pks.im>

I'd say that it was you two folks who figured this out, I didn't really
help much :) But I won't complain.

> Signed-off-by: D. Ben Knoble <ben.knoble+github@gmail.com>
> ---
>  src/cargo-meson.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/src/cargo-meson.sh b/src/cargo-meson.sh
> index 3998db0435..38728a3711 100755
> --- a/src/cargo-meson.sh
> +++ b/src/cargo-meson.sh
> @@ -26,7 +26,7 @@
>  	exit $RET
>  fi
>  
> -case "$(cargo -vV | sed -s 's/^host: \(.*\)$/\1/')" in
> +case "$(cargo -vV | sed -n 's/^host: \(.*\)$/\1/p')" in
>  	*-windows-*)
>  		LIBNAME=gitcore.lib;;
>  	*)

Yup, this looks exactly like discussed. Thanks, the fix looks good to
me!

Patrick