linux-kernel - Re: [PATCH 12/23] scripts/nsdeps: use VPATH as src

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Message-ID: <ZvQb0Bsvrm-HLQ6g@l-nschier-nb>
Date: Wed, 25 Sep 2024 16:18:56 +0200
From: Nicolas Schier <n.schier@....de>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: linux-kbuild@...r.kernel.org, Miguel Ojeda <ojeda@...nel.org>,
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
	Nathan Chancellor <nathan@...nel.org>
Subject: Re: [PATCH 12/23] scripts/nsdeps: use VPATH as src_prefix

On Tue, Sep 17, 2024 at 11:16:40PM +0900, Masahiro Yamada wrote:
> This change allows it to work not only for in-tree modules but also for
> external modules, even if they are built in a separate build directory.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
>  scripts/nsdeps | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/scripts/nsdeps b/scripts/nsdeps
> index f1718cc0d700..8b4db63838ce 100644
> --- a/scripts/nsdeps
> +++ b/scripts/nsdeps
> @@ -19,10 +19,10 @@ if ! { echo "$SPATCH_REQ_VERSION"; echo "$SPATCH_VERSION"; } | sort -CV ; then
>  	exit 1
>  fi
>  
> -if [ "$KBUILD_EXTMOD" ]; then
> +if [ "${VPATH+set}" ]; then
>  	src_prefix=
>  else
> -	src_prefix=$srctree/
> +	src_prefix=$VPATH/

In kbuild, we expect VPATH to be empty or hold one single directory,
while make itself allows VPATH to be a list of directories.  Might it
make sense to mention this at some place?

Reviewed-by: Nicolas Schier <n.schier@....de>

>  fi
>  
>  generate_deps_for_ns() {
> -- 
> 2.43.0
>